安卓studio 个人课设项目：“这个app“——实现注册登录，显示用户信息功能，并跳转对应网页

目录

目录

功能说明 

登录页面

注册页面

登录后界面

点击头像出现侧滑界面，并显示用户信息

点击编辑按钮进入信息编辑页面

 保存后返回

 用户名已更改

跳转网页

相关代码

布局

登录界面

 注册界面

 信息显示界面

 主界面

实现侧滑布局 

信息编辑界面

网页显示界面 

manifest 

逻辑代码 

 LoginActivity

RegisterActivity

EditInformationActivity

RelaxActivity

StudyActivity

SlideActivity

实现侧滑功能

网页activity

网页配置——SetWebView.class

 进度条加载——SetProgressBar.class

 数据库helper

user类

ToastUtil

结语

2022.11.12更新

功能说明 

登录页面

注册页面

能够验证用户名是否已存在，并判断两次密码是否一致

登录后界面

点击头像出现侧滑界面，并显示用户信息

当前用户无信息

点击编辑按钮进入信息编辑页面

编辑信息

 保存后返回

信息页面显示更改后的信息

 用户名已更改

修改用户名后，下次登录需要填写更改后的用户名

跳转网页

点击按钮进入相应的网页 ，这里点击  “长知识”>>“菜鸟学编程”

相关代码

布局

登录界面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/bg_blue_orange"
    android:orientation="vertical"
    tools:context=".LoginActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:layout_marginTop="100dp"
        android:text="欢迎使用这个app!"
        android:textColor="@color/white"
        android:textSize="20sp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginHorizontal="30dp"
        android:layout_marginTop="80dp"
        android:background="@drawable/bt_humditiy"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView10"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="3"
            android:text="用户名："
            android:textColor="@color/white"
            android:layout_marginLeft="5dp"
            android:textSize="18dp" />

        <EditText
            android:id="@+id/Ed_username"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:hint="@string/input_username"
            android:inputType="textPersonName"
            android:textColor="@color/white" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginHorizontal="30dp"
        android:layout_marginTop="30dp"
        android:background="@drawable/bt_humditiy"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView11"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="3"
            android:text="密码："
            android:textColor="@color/white"
            android:layout_marginLeft="5dp"
            android:textSize="18dp" />

        <EditText
            android:id="@+id/Ed_password"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:hint="@string/input_password"
            android:inputType="textPassword"
            android:textColor="@color/white"
            android:textColorHighlight="@color/white" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="80dp"
        android:orientation="horizontal">

        <Button
            android:id="@+id/bt_login"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:background="@drawable/bt_humditiy"
            android:text="@string/login"
            android:textColor="@color/white"
            android:layout_marginLeft="20dp"
            android:layout_marginRight="20dp"
            android:textSize="20sp" />

        <Button
            android:id="@+id/bt_register"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@drawable/bt_humditiy"
            android:text="@string/registered"
            android:textColor="@color/white"
            android:layout_marginRight="20dp"
            android:layout_marginLeft="20dp"
            android:textSize="24sp" />
    </LinearLayout>

</LinearLayout>

 注册界面

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/bg_blue_orange"
    tools:context=".RegisterActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <TextView
            android:id="@+id/register_title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="注册"
            android:textSize="40dp"
            android:textColor="@color/white"
            android:layout_marginTop="20dp"
            android:layout_marginStart="160dp"/>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="120dp"
            android:background="@drawable/bt_humditiy"
            android:layout_marginHorizontal="20dp"
            android:orientation="horizontal">

            <TextView
                android:id="@+id/textView7"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="3"
                android:textColor="@color/white"
                android:textSize="18dp"
                android:layout_marginLeft="5dp"
                android:text="用户名:" />

            <EditText
                android:id="@+id/set_username"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:ems="10"
                android:hint="请输入用户名："
                android:inputType="textPersonName" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:background="@drawable/bt_humditiy"
            android:layout_marginHorizontal="20dp"
            android:orientation="horizontal">

            <TextView
                android:id="@+id/textView8"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="3"
                android:textColor="@color/white"
                android:textSize="18dp"
                android:layout_marginLeft="5dp"
                android:text="密码:" />

            <EditText
                android:id="@+id/set_userPassword1"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:ems="10"
                android:hint="请输入密码："
                android:inputType="textPassword" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:background="@drawable/bt_humditiy"
            android:layout_marginHorizontal="20dp"
            android:orientation="horizontal">

            <TextView
                android:id="@+id/textView9"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="3"
                android:textColor="@color/white"
                android:textSize="18dp"
                android:layout_marginLeft="5dp"
                android:text="确认密码:" />

            <EditText
                android:id="@+id/set_userPassword2"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:ems="10"
                android:hint="再次输入密码："
                android:inputType="textPassword" />
        </LinearLayout>

        <Button
            android:id="@+id/bt_startRegister"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="80dp"
            android:layout_marginHorizontal="100dp"
            android:background="@drawable/bt_humditiy"
            android:textColor="@color/white"
            android:textSize="20dp"
            android:text="点击注册" />
    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

 信息显示界面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="270dp"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@drawable/bg_purple_miror">

    <TextView
        android:id="@+id/tv_userInformation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="个人信息"
        android:textColor="@color/white"
        android:textSize="25dp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/tv_age"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:layout_weight="3"
            android:text="年龄:"
            android:textColor="@color/white"
            android:textSize="22dp" />

        <TextView
            android:id="@+id/tv_userAge"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textColor="@color/white"
            android:layout_weight="1"
            android:textSize="22dp"
            android:layout_marginTop="20dp"
            android:text="TextView" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/tv_sex"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="3"
            android:text="性别:"
            android:textColor="@color/white"
            android:textSize="22dp" />

        <TextView
            android:id="@+id/tv_userSex"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:textColor="@color/white"
            android:textSize="22dp"
            android:text="TextView" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/tv_favorite"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="3"
            android:text="爱好:"
            android:textColor="@color/white"
            android:textSize="22dp" />

        <TextView
            android:id="@+id/tv_userFavorite"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:textColor="@color/white"
            android:textSize="22dp"
            android:text="TextView" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:layout_marginTop="20dp"
        android:orientation="vertical">

        <TextView
            android:id="@+id/tv_signature"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="个性签名:"
            android:textColor="@color/white"
            android:textSize="20dp" />

        <TextView
            android:id="@+id/tv_userSignature"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="9"
            android:textColor="@color/white"
            android:textSize="22dp"
            android:text="TextView" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <Button
            android:id="@+id/bt_toEdit"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="200dp"
            android:background="@color/bitGrey"
            android:paddingLeft="180dp"
            android:text="编辑>"
            android:textColor="@color/white"
            android:textSize="30dp" />
    </LinearLayout>

</LinearLayout>

 主界面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@drawable/bg_purple">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:layout_marginTop="10dp">

        <ImageView
            android:id="@+id/iv_head"
            android:layout_width="60dp"
            android:layout_height="wrap_content"
            android:src="@mipmap/head1"
            android:layout_marginTop="5dp"
            android:layout_marginLeft="10dp"
            android:scaleType="centerCrop"/>

        <TextView
            android:id="@+id/tv_username"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:text="user_冰川"
            android:textSize="30dp"
            android:layout_margin="10dp"
            android:textColor="@color/white"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="15dp"
        android:layout_marginTop="200dp"
        android:orientation="vertical">

        <Button
            android:id="@+id/btn_study"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="40dp"
            android:text="长知识"
            android:background="@drawable/bt_humditiy"
            android:textColor="@color/white"/>

        <Button
            android:id="@+id/btn_relax"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="40dp"
            android:text="找点乐子"
            android:background="@drawable/bt_humditiy"
            android:textColor="@color/white"/>

    </LinearLayout>

</LinearLayout>

实现侧滑布局 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".SlideActivity">

    <com.example.myfirst.util.SlideMenu
        android:id="@+id/slideMenu"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <!--        信息界面布局-->
        <include layout="@layout/layout_menu" />

        <!--        主界面布局-->
        <include
            layout="@layout/layout_main"
            android:layout_width="wrap_content"
            android:layout_height="743dp" />
    </com.example.myfirst.util.SlideMenu>

</LinearLayout>

信息编辑界面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@drawable/bg_green_blue"
    tools:context=".EditInformationActivity">

    <TextView
        android:id="@+id/Tv_EditInformation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="信息编辑"
        android:textColor="@color/white"
        android:textSize="30sp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/bitGrey"
        android:layout_marginTop="120dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:textColor="@color/white"
            android:textSize="25dp"
            android:layout_marginLeft="10dp"
            android:text="用户名：" />

        <EditText
            android:id="@+id/Et_EditUsername"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:inputType="textPersonName"
            android:textColor="@color/white"
            android:textSize="20dp" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/bitGrey"
        android:layout_marginTop="20dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:textColor="@color/white"
            android:textSize="25dp"
            android:layout_marginLeft="10dp"
            android:text="年龄：" />

        <EditText
            android:id="@+id/Et_editAge"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:inputType="textPersonName"
            android:textColor="@color/white"
            android:textSize="20dp" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/bitGrey"
        android:layout_marginTop="20dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView4"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:textColor="@color/white"
            android:textSize="25dp"
            android:layout_marginLeft="10dp"
            android:text="性别：" />

        <RadioGroup
            android:id="@+id/rg_sex"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="horizontal"
            android:layout_weight="1">

            <RadioButton
                android:id="@+id/rdB_male"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="男" />

            <RadioButton
                android:id="@+id/rdB_female"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="女" />

        </RadioGroup>

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/bitGrey"
        android:layout_marginTop="20dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView5"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:textColor="@color/white"
            android:textSize="25dp"
            android:layout_marginLeft="10dp"
            android:text="爱好：" />

        <EditText
            android:id="@+id/Et_editFavorite"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:inputType="textPersonName"
            android:textColor="@color/white"
            android:textSize="20dp" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/bitGrey"
        android:layout_marginTop="20dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView6"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:textColor="@color/white"
            android:textSize="25dp"
            android:layout_marginLeft="10dp"
            android:text="个性签名：" />

        <EditText
            android:id="@+id/Et_editSignature"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:inputType="textPersonName"
            android:textColor="@color/white"
            android:textSize="20dp" />
    </LinearLayout>
    <Button
        android:id="@+id/bt_saveInformation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="100dp"
        android:layout_marginHorizontal="100dp"
        android:background="@drawable/bt_humditiy"
        android:textColor="@color/white"
        android:textSize="30dp"
        android:text="保存" />


</LinearLayout>

网页显示界面 

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".RunoobActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <ProgressBar
            android:id="@+id/pb_run_oob"
            style="?android:attr/progressBarStyleHorizontal"
            android:max="100"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

        <WebView
            android:id="@+id/wv_runOob"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    </LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

manifest 

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.myfirst">

    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/this_app"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/this_app"
        android:supportsRtl="true"
        android:theme="@style/Theme.Myfirst"
        android:usesCleartextTraffic="true">
        <activity
            android:name=".FlowerActivity"
            android:exported="false" />
        <activity
            android:name=".EndlessLakeActivity"
            android:exported="false" />
        <activity
            android:name=".SpaceActivity"
            android:exported="false" />
        <activity
            android:name=".DeepSeaActivity"
            android:exported="false" />
        <activity
            android:name=".AnswerActivity"
            android:exported="false" />
        <activity
            android:name=".MedicineActivity"
            android:exported="false" />
        <activity
            android:name=".TechnologyMuseumActivity"
            android:exported="false" />
        <activity
            android:name=".RunoobActivity"
            android:exported="false" />
        <activity
            android:name=".EditInformationActivity"
            android:exported="false" />
        <activity
            android:name=".RegisterActivity"
            android:exported="false" /> <!-- 防止net::ERR_CLEARTEXT_NOT_PERMITTED -->
        <activity
            android:name=".WhichoneActivity"
            android:exported="false" />
        <activity
            android:name=".LoopTapActivity"
            android:exported="false" />
        <activity
            android:name=".HenxiangsiActivity"
            android:exported="false" />
        <activity
            android:name=".MikutapActivity"
            android:exported="false" />
        <activity
            android:name=".SummondragonActivity"
            android:exported="false" />
        <activity
            android:name=".EatwhatActivity"
            android:exported="false" />
        <activity
            android:name=".WebZTypeActivity"
            android:exported="false" />
        <activity
            android:name=".RelaxActivity"
            android:exported="false" />
        <activity
            android:name=".StudyActivity"
            android:exported="false" />
        <activity
            android:name=".SlideActivity"
            android:exported="true" />
        <activity
            android:name=".LoginActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

逻辑代码 

 LoginActivity

package com.example.myfirst;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import com.example.myfirst.util.DBHelper;
import com.example.myfirst.util.ToastUtil;
import com.example.myfirst.util.User;

import java.util.ArrayList;

public class LoginActivity extends AppCompatActivity implements View.OnClickListener {
                                 //当需要用到新的onClick()时，要 implements View.OnClickListener
    private Button mBtLogin;            //声明变量
    private EditText mEtUser;
    private EditText mEtPassword;
    private Button mBtRegister;
    private DBHelper dbHelper;
    public static int userId;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        mBtLogin = findViewById(R.id.bt_login);
        mEtPassword = findViewById(R.id.Ed_password);
        mEtUser = findViewById(R.id.Ed_username);
        mBtRegister = findViewById(R.id.bt_register);

        dbHelper = new DBHelper(this);
        mBtLogin.setOnClickListener(this);       //当需要用到新的onClick()时，就用this
        mBtRegister.setOnClickListener(this);
    }

    public void onClick(View view){
        switch (view.getId()){
            case R.id.bt_login:
                String username = mEtUser.getText().toString().trim();
                String password = mEtPassword.getText().toString().trim();

                if(!TextUtils.isEmpty(username) && !TextUtils.isEmpty(password)){
                    ArrayList<User> userData = dbHelper.getData();  //在User list创建一个实例userData
                    boolean judge = false;                          //并让userData获取数据库里的数据
                    for (int i = 0; i < userData.size(); i++){
                        User user = userData.get(i);
                        if (username.equals(user.getName()) && password.equals(user.getPassword())){
                            judge = true;
                            userId = i;
                            break;
                        }              //遍历user id，当输入的用户名和密码与数据库里的数据匹配则judge=true
                        else {
                            judge = false;
                        }
                    }
                    if (judge){
                        ToastUtil.showMsg(LoginActivity.this,"登陆成功!");
                        Intent intent2 = new Intent(this,SlideActivity.class);
                        startActivity(intent2);
                        finish();
                    }
                    else {
                        ToastUtil.showMsg(LoginActivity.this,"用户名错误或密码错误!");
                    }
                }
                else {
                    ToastUtil.showMsg(LoginActivity.this,"用户名或密码不能为空");
                }
                break;
            case R.id.bt_register:
                Intent intent1 = new Intent(LoginActivity.this,RegisterActivity.class);
                startActivity(intent1);
                break;
        }
    }
    public  static int getUserId(){
        return userId;
    }
}

RegisterActivity

package com.example.myfirst;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import com.example.myfirst.util.DBHelper;
import com.example.myfirst.util.ToastUtil;

public class RegisterActivity extends AppCompatActivity implements View.OnClickListener{

    private Button mBtToRegister;
    private DBHelper dbHelper;
    private EditText mEtSetUsername;
    private EditText mEtSetUserPassword1;
    private EditText mEtSetUserPassword2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);

        mEtSetUsername = findViewById(R.id.set_username);
        mEtSetUserPassword1 = findViewById(R.id.set_userPassword1);
        mEtSetUserPassword2 = findViewById(R.id.set_userPassword2);
        mBtToRegister = findViewById(R.id.bt_startRegister);

        dbHelper = new DBHelper(this);
        mBtToRegister.setOnClickListener(this);
    }

    public void onClick(View view){
        String username = mEtSetUsername.getText().toString().trim();
        String password1 = mEtSetUserPassword1.getText().toString().trim();
        String password2 = mEtSetUserPassword2.getText().toString().trim();

        if (!TextUtils.isEmpty(username) && !TextUtils.isEmpty(password1)&& !TextUtils.isEmpty(password2)  ) {
                if ((password1.equals(password2))) {
                    if (dbHelper.add(username, password2)){
                        //将用户名和密码加入到数据库中
                        Intent intent2 = new Intent(this, LoginActivity.class);
                        startActivity(intent2);
                        finish();
                        ToastUtil.showMsg(RegisterActivity.this,"注册成功！");
                    }
                    else {
                        ToastUtil.showMsg(RegisterActivity.this,"该用户名已存在！");
                    }
                }
                else {
                    ToastUtil.showMsg(RegisterActivity.this,"密码输入不一致");
                }
        }
        else {
            ToastUtil.showMsg(RegisterActivity.this,"用户名和密码不能为空！");
        }
    }
}

EditInformationActivity

信息编辑activity

package com.example.myfirst;

import androidx.appcompat.app.AppCompatActivity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;

import com.example.myfirst.util.DBHelper;
import com.example.myfirst.util.ToastUtil;
import com.example.myfirst.util.User;

import java.util.ArrayList;

public class EditInformationActivity extends AppCompatActivity implements View.OnClickListener{

    private EditText mEtUsername,mEtAge,mEtFavorite,mEtSignature;
    private Button mBtSaveInformation;
    private DBHelper dbHelper;
    private RadioButton mRbMale,mRbFemale;
    private String sexString;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_edit_infor);

        mEtUsername = findViewById(R.id.Et_EditUsername);
        mEtAge = findViewById(R.id.Et_editAge);
        mRbMale = findViewById(R.id.rdB_male);
        mRbFemale = findViewById(R.id.rdB_female);
        mEtFavorite = findViewById(R.id.Et_editFavorite);
        mEtSignature = findViewById(R.id.Et_editSignature);
        mBtSaveInformation = findViewById(R.id.bt_saveInformation);

        dbHelper = new DBHelper(this);

        showRadioButtonIsCheck();

        mBtSaveInformation.setOnClickListener(this);
    }

    private void showRadioButtonIsCheck(){            //定义一个根据用户性别显示 哪个radiobutton被选中的方法
        ArrayList<User> userData = dbHelper.getData();
        User user = userData.get(LoginActivity.getUserId());

        if (!(user.getSex() == null)){
            if (user.getSex().equals("男")){
                mRbMale.setChecked(true);
            }else if (user.getSex().equals("女")){
                mRbFemale.setChecked(true);
            }
        }
    }

    @Override
    public void onClick(View view) {
        String username = mEtUsername.getText().toString().trim();
        String age = mEtAge.getText().toString();
        String favorite = mEtFavorite.getText().toString();
        String signature = mEtSignature.getText().toString();         //分别获取输入的用户信息

        if (!username.isEmpty()){
            dbHelper.updateUsername(username);
        }
        if (!age.isEmpty()){
            dbHelper.updateAge(age);
        }

        if (mRbMale.isChecked()){
            sexString = "男";
        }else if (mRbFemale.isChecked()){
            sexString = "女";
        }
        dbHelper.updateSex(sexString);

        if (!favorite.isEmpty()){
            dbHelper.updateFavorite(favorite);
        }
        if (!signature.isEmpty()){
            dbHelper.updateSignature(signature);        //分别保存到数据库中的User表，必须做一个是否为空的检查
        }                                               //否则表中数据可能会被覆盖

        SlideActivity.slideActivity.finish();              //更改后销毁原来的信息显示页面
        ToastUtil.showMsg(this,"更改成功");
        Intent intent = new Intent(EditInformationActivity.this,SlideActivity.class);
        startActivity(intent);
        finish();

    }
}

RelaxActivity

娱乐

package com.example.myfirst;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class RelaxActivity extends AppCompatActivity {

    private Button btnGame1,btnGame2,btnGame3,btnGame4,btnGame5,btnGame6,btnGame7,btnGame8,btnGame9;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_relax);

        btnGame1 = findViewById(R.id.bt_game1);
        btnGame2 = findViewById(R.id.bt_game2);
        btnGame3 = findViewById(R.id.bt_game3);
        btnGame4 = findViewById(R.id.bt_game4);
        btnGame5 = findViewById(R.id.bt_game5);
        btnGame6 = findViewById(R.id.bt_game6);
        btnGame7 = findViewById(R.id.bt_game7);
        btnGame8 = findViewById(R.id.bt_game8);
        btnGame9 = findViewById(R.id.bt_game9);

        setClickListener();
    }
    private class OnClick implements View.OnClickListener{      //新建私有类OnClick，实现View.OnClickListener
        @Override                                               //重写onClick方法
        public void onClick(View view) {
            Intent intent = null;
            switch (view.getId()){
                case R.id.bt_game1:
                    intent = new Intent(RelaxActivity.this,WebZTypeActivity.class);
                    break;
                case R.id.bt_game2:
                    intent = new Intent(RelaxActivity.this,EatwhatActivity.class);
                    break;
                case R.id.bt_game3:
                    intent = new Intent(RelaxActivity.this, SummondragonActivity.class);
                    break;
                case R.id.bt_game4:
                    intent = new Intent(RelaxActivity.this,WhichoneActivity.class);
                    break;
                case R.id.bt_game5:
                    intent = new Intent(RelaxActivity.this,MikutapActivity.class);
                    break;
                case R.id.bt_game6:
                    intent = new Intent(RelaxActivity.this,HenxiangsiActivity.class);
                    break;
                case R.id.bt_game7:
                    intent = new Intent(RelaxActivity.this, LoopTapActivity.class);
                    break;
                case R.id.bt_game8:
                    intent = new Intent(RelaxActivity.this, FlowerActivity.class);
                    break;
                case R.id.bt_game9:
                    intent = new Intent(RelaxActivity.this, EndlessLakeActivity.class);
                    break;
            }
            startActivity(intent);
        }
    }
    //设计方法
    private void setClickListener(){
        OnClick onClick = new OnClick();       //在OnClick新建onClick实体，否则36行OnClick是灰色的，也就是没被调用
        btnGame1.setOnClickListener(onClick); //每个button都调用监听，并用上面的方法
        btnGame2.setOnClickListener(onClick);
        btnGame3.setOnClickListener(onClick);
        btnGame4.setOnClickListener(onClick);
        btnGame5.setOnClickListener(onClick);
        btnGame6.setOnClickListener(onClick);
        btnGame7.setOnClickListener(onClick);
        btnGame8.setOnClickListener(onClick);
        btnGame9.setOnClickListener(onClick);
    }
}

StudyActivity

学习

package com.example.myfirst;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.SearchEvent;
import android.view.View;
import android.widget.Button;

public class StudyActivity extends AppCompatActivity {

    private Button btnStudy1,btnStudy2,btnStudy3,btnStudy4,btnStudy5,btnStudy6;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_study);

        btnStudy1 = findViewById(R.id.btn_study1);
        btnStudy2 = findViewById(R.id.btn_study2);
        btnStudy3 = findViewById(R.id.btn_study3);
        btnStudy4 = findViewById(R.id.btn_study4);
        btnStudy5 = findViewById(R.id.btn_study5);
        btnStudy6 = findViewById(R.id.btn_study6);

        setClickListener();
    }

    private class OnClick implements View.OnClickListener{     //新建私有类OnClick，与 View.OnClickListener接口对接
        @Override
        public void onClick(View view) {
            Intent intent = null;
            switch (view.getId()){
                case R.id.btn_study1:
                    intent = new Intent(StudyActivity.this,RunoobActivity.class);
                    break;
                case R.id.btn_study2:
                    intent = new Intent(StudyActivity.this,TechnologyMuseumActivity.class);
                    break;
                case R.id.btn_study3:
                    intent = new Intent(StudyActivity.this,MedicineActivity.class);
                    break;
                case R.id.btn_study4:
                    intent = new Intent(StudyActivity.this,AnswerActivity.class);
                    break;
                case R.id.btn_study5:
                    intent = new Intent(StudyActivity.this,SpaceActivity.class);
                    break;
                case R.id.btn_study6:
                    intent = new Intent(StudyActivity.this, DeepSeaActivity.class);
                    break;
            }
            startActivity(intent);
        }
    }
    private void setClickListener(){
        OnClick onClick = new OnClick();
        btnStudy1.setOnClickListener(onClick);
        btnStudy2.setOnClickListener(onClick);
        btnStudy3.setOnClickListener(onClick);
        btnStudy4.setOnClickListener(onClick);
        btnStudy5.setOnClickListener(onClick);
        btnStudy6.setOnClickListener(onClick);          //每个button都调用监听，并用上面的方法
    }
}

SlideActivity

侧滑

package com.example.myfirst;

import androidx.appcompat.app.AppCompatActivity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.myfirst.util.DBHelper;
import com.example.myfirst.util.SlideMenu;
import com.example.myfirst.util.User;

import java.util.ArrayList;

public class SlideActivity extends AppCompatActivity {

    private ImageView mIvHead;
    private SlideMenu slideMenu;
    private Button buttonStudy;
    private Button buttonRelax;
    private Button buttonToEdit;
    private TextView mTvUsername,mTvSex,mTvAge,mTvFavorite,mTvSignature;
    private DBHelper dbHelper;

    public static SlideActivity slideActivity;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_slide);
        slideActivity = this;

        mIvHead = findViewById(R.id.iv_head);
        slideMenu = findViewById(R.id.slideMenu);
        buttonStudy = findViewById(R.id.btn_study);
        buttonRelax = findViewById(R.id.btn_relax);
        buttonToEdit = findViewById(R.id.bt_toEdit);

        mTvUsername = findViewById(R.id.tv_username);               //用户信息显示控件
        mTvSex = findViewById(R.id.tv_userSex);
        mTvAge = findViewById(R.id.tv_userAge);
        mTvFavorite = findViewById(R.id.tv_userFavorite);
        mTvSignature = findViewById(R.id.tv_userSignature);

        mIvHead.setOnClickListener(v -> slideMenu.switchMenu());

        setClickListener();

        dbHelper = new DBHelper(this);
        showUserInformation();
    }
//由于button太多，设计一个方法，设计方法之前写好要调用的类
    private class OnClick implements View.OnClickListener{      //新建私有类OnClick，实现View.OnClickListener
        @Override                                               //重写onClick方法
        public void onClick(View view) {
            Intent intent = null;
            switch (view.getId()){
                case R.id.btn_study:
                    intent = new Intent(SlideActivity.this,StudyActivity.class);
                    break;
                case R.id.btn_relax:
                    intent = new Intent(SlideActivity.this,RelaxActivity.class);
                    break;
                case R.id.bt_toEdit:
                    intent = new Intent(SlideActivity.this,EditInformationActivity.class);
            }
            startActivity(intent);
        }
    }
//设计方法
    private void setClickListener(){
        OnClick onClick = new OnClick();         //在OnClick新建onClick实体，否则36行OnClick是灰色的，也就是没被调用
        buttonStudy.setOnClickListener(onClick); //每个button都调用监听，并用上面的方法
        buttonRelax.setOnClickListener(onClick);
        buttonToEdit.setOnClickListener(onClick);
    }

    private void showUserInformation() {                          //建立获取用户信息的方法
        ArrayList<User> userData2 = dbHelper.getData();           //创建User队列 userData2
        User user = userData2.get(LoginActivity.getUserId());      //创建一个实体user，并获取当前用户id的数据
        mTvUsername.setText(user.getName());
        mTvAge.setText(user.getAge());
        mTvSex.setText(user.getSex());
        mTvFavorite.setText(user.getFavorite());                  //分别获取用户信息到TV控件
        mTvSignature.setText(user.getSignature());
    }
}

实现侧滑功能

这里是使用了别人封装好的类，👇（顺带一提，小姐姐在b站的教学视频很好） b站材料1-代码之侧滑界面的java文件_小小小白冷的博客-CSDN博客

package com.example.myfirst.util;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.Scroller;

public class SlideMenu extends FrameLayout {
    private View menuView,mainView;
    private int menuWidth;
    private Scroller scroller;
    public SlideMenu(Context context) {
        super(context);
        init();
    }
    public SlideMenu(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }
    private void init(){
        scroller = new Scroller(getContext());
    }
    /**
     * 当1级子view全部加载完调用，可以用初始化子view引用
     * 注意这里无法获取子view的宽高
     */
    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        menuView = getChildAt(0);
        mainView = getChildAt(1);
        menuWidth = menuView.getLayoutParams().width;
    }
    //使Menu也具有滑动功能
    public boolean onInterceptTouchEvent(MotionEvent ev){
        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN:
                downX = (int) ev.getX();
                break;
            case MotionEvent.ACTION_MOVE:
                int deltaX = (int) (ev.getX() - downX);
                if (Math.abs(deltaX) > 8){
                    return true;
                }
                break;
        }
        return super.onInterceptTouchEvent(ev);
    }

    /**
     * s设置两个子view在页面上的布局
     * @param l:当前子view的左边在父view的坐标系的x坐标
     * @param t:当前子view的顶边在父view的坐标系的y坐标
     * @param r:当前子view的宽
     * @param b:当前子view的高
     */
    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        menuView.layout(-menuWidth, 0, 0, b);
        mainView.layout(0, 0, r, b);
    }

    /**
     * 处理屏幕滑动事件
     */
    private int downX;
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                downX = (int) event.getX();
                break;
            case MotionEvent.ACTION_MOVE:
                int moveX = (int) event.getX();
                int deltaX = moveX - downX;
                int newScrollX = getScrollX() - deltaX;
                if (newScrollX < -menuWidth) newScrollX = -menuWidth;
                if (newScrollX > 0) newScrollX = 0;
                scrollTo(newScrollX, 0);
                downX = moveX;
                break;
            case MotionEvent.ACTION_UP:
                //当滑动距离小于Menu宽度的一半时，平滑滑动到主页面
                if(getScrollX()>-menuWidth/2){
                    closeMenu();
                }else {
                    //当滑动距离大于Menu宽度的一半时，平滑滑动到Menu页面
                    openMenu();
                }
                break;
        }
        return true;
    }
    //关闭menu
    private void closeMenu(){
        scroller.startScroll(getScrollX(),0,0-getScrollX(),0,400);
        invalidate();
    }
    //打开menu
    private void openMenu(){
        scroller.startScroll(getScrollX(),0,-menuWidth-getScrollX(),0,400);
        invalidate();
    }
    /**
     * Scroller不主动去调用这个方法
     * 而invalidate()可以调用这个方法
     * invalidate->draw->computeScroll
     */
    public void computeScroll(){
        super.computeScroll();
        if(scroller.computeScrollOffset()){
            //返回true,表示动画没结束
            scrollTo(scroller.getCurrX(),0);
            invalidate();
        }
    }
    /**
     * 切换菜单的开和关
     */
    public void switchMenu(){
        if(getScrollX()==0){
            openMenu();
        }else {
            closeMenu();
        }
    }

}

网页activity

每个网页activity的内容步骤都一样，这里以菜鸟编程为例

package com.example.myfirst;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;

import com.example.myfirst.util.SetProgressBar;
import com.example.myfirst.util.SetWebView;

public class RunoobActivity extends AppCompatActivity {

    private WebView webView;
    private String url = "https://www.runoob.com/";
    private ProgressBar progressBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_runoob);

        webView = findViewById(R.id.wv_runOob);
        progressBar = findViewById(R.id.pb_run_oob);

        SetProgressBar.setProgressBar(webView,progressBar);
        SetWebView.setWebView(webView,url);
    }
}

网页配置——SetWebView.class

package com.example.myfirst.util;

import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class SetWebView {
    public static void setWebView(WebView webView,String url){

        webView.getSettings().setSupportZoom(true);                        //设置可以支持缩放

        webView.getSettings().setBuiltInZoomControls(true);                //设置出现缩放工具

        webView.getSettings().setUseWideViewPort(true);                    //扩大比例的缩放

        webView.getSettings().setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN);
                                                                            //自适应屏幕,也就是不能左右滑动

        webView.getSettings().setLoadWithOverviewMode(true);                //加载完全缩小的WebView

        webView.getSettings().setJavaScriptEnabled(true);                  //支持JavaScript

        webView.getSettings().setAppCacheEnabled(true);                    //开启应用缓存

        webView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);      //设置缓存模式

        webView.getSettings().setDomStorageEnabled(true);                  //开启 DOM storage API 功能

        webView.setWebViewClient(new WebViewClient(){       //防止访问网页时跳转到外部页面
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {   //防止跳转到外部浏览器
                return false;
            }
        });
        webView.loadUrl(url);
    }
}

 进度条加载——SetProgressBar.class

package com.example.myfirst.util;

import android.view.View;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.widget.ProgressBar;

public class SetProgressBar {                    //单独建立一个加载进度条的类和方法

    public static void setProgressBar(WebView webView,ProgressBar progressBar){

        webView.setWebChromeClient(new WebChromeClient(){
            @Override
            public void onProgressChanged(WebView view, int newProgress) {
                super.onProgressChanged(view, newProgress);

                if (newProgress == 100){
                    progressBar.setVisibility(View.GONE);           //加载完成后消失
                }else {
                    progressBar.setVisibility(View.VISIBLE);        //未加载完成则可见
                    progressBar.setProgress(newProgress);           //让控件获取当前加载进度
                }
            }
        });
    }
}

 数据库helper

package com.example.myfirst.util;

import android.annotation.SuppressLint;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

import java.util.ArrayList;

public class DBHelper extends SQLiteOpenHelper {
    private SQLiteDatabase db;

    public DBHelper(Context context){                  //构造函数
        super(context,"db_thisApp",null,1);
        db = getReadableDatabase();
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("create table if not exists user(" +
                "_id integer primary key autoincrement,"+
                "name text,"+
                "password text," +
                "sex text," +
                "age text," +
                "favorite text," +
                "signature text" +
                ")");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("drop table if exists user");
        onCreate(db);
    }

    public boolean add(String name, String password){           //验证用户名是否已存在并注册
        boolean judge2 = true;
        ArrayList<User> userData = this.getData(); //在User list创建一个实例userData,并让userData获取数据库里的数据
        for (int i = 0; i < userData.size(); i++){
            User user = userData.get(i);
            if (name.equals(user.getName())){
                judge2 = false;
                break;
            }              //遍历user id，当输入的用户名已存在则false
        }
        if (judge2){
            db.execSQL("insert into user(name,password) values(?,?)", new Object[]{name,password});
        }
        return judge2;
    }                                                     // 需要用Object[]把值传进 ？中

    public void delete(String name,String password){
        db.execSQL("delete from user where name = and password =" + name + password);
    }

    public void update(String name,String password){
        db.execSQL("update user set password = ?",new Object[]{password});
    }

    public void updateUsername(String name){
        db.execSQL("update user set name = ?", new Object[]{name});       //创建一个更新用户信息的DB方法
    }

    public void updateSex(String sex){
        db.execSQL("update user set sex = ?", new Object[]{sex});
    }

    public void updateAge(String age){
        db.execSQL("update user set age = ?", new Object[]{age});
    }

    public void updateFavorite(String favorite){
        db.execSQL("update user set favorite = ?", new Object[]{favorite});
    }

    public void updateSignature(String signature){
        db.execSQL("update user set signature = ?", new Object[]{signature});
    }

    public ArrayList<User> getData(){
        //从数据库获取数据到list中
        ArrayList<User> userList = new ArrayList<User>();             //队列，以User结构建立队列，也就是建立User队列
        Cursor cursor = db.query("user",null,null,
                                null,
                                null,
                                null,
                                "name desc");
        while (cursor.moveToNext()){                     //因为value must be>0，所以不能使用moveToFirst，否则程序会崩溃：
            @SuppressLint("Range") String name = cursor.getString(cursor.getColumnIndex("name"));
            @SuppressLint("Range") String password = cursor.getString(cursor.getColumnIndex("password"));
            @SuppressLint("Range") String sex = cursor.getString(cursor.getColumnIndex("sex"));
            @SuppressLint("Range") String age = cursor.getString(cursor.getColumnIndex("age"));
            @SuppressLint("Range") String favorite = cursor.getString(cursor.getColumnIndex("favorite"));
            @SuppressLint("Range") String signature = cursor.getString(cursor.getColumnIndex("signature"));
            userList.add(new User(name,password,sex,age,favorite,signature));
        }
        cursor.close();                      //游标一定要关掉！！！不然遍历过后会停留在最后一个位置，语句的位置也很讲究
        return userList;                        //从表中遍历的值依次存入list中
    }
}

 这里考虑到真实情况下，用户进去可能只更新一种属性，所以把用户的每种属性实现了单独更新

user类

package com.example.myfirst.util;

public class User {                          //构造User结构
    private String name;
    private String password;
    private String sex,age,favorite,signature;
    public User(String name,String password,String sex,String age,String favorite,String signature){
        this.name = name;
        this.password = password;
        this.sex = sex;
        this.age = age;
        this.favorite = favorite;
        this.signature = signature;
    }

    public String getName() {
        return name;
    }

    public String getPassword() {
        return password;
    }

    public String getSex(){
        return sex;
    }

    public String getAge(){
        return age;
    }

    public String getFavorite(){
        return favorite;
    }

    public String getSignature(){
        return signature;
    }

}

ToastUtil

这个是用来学习而创建的，上面的一些activity都用到了这里面的方法，无关紧要，可以直接Toast.makeText()

package com.example.myfirst.util;

import android.content.Context;
import android.widget.Toast;

public class ToastUtil {
    public static Toast mToast;
    public static void showMsg(Context context,String msg){
      if(mToast == null){
          mToast = Toast.makeText(context,msg,Toast.LENGTH_SHORT);
       }
       else{
          mToast.setText(msg);
       }
       mToast.show();

    }             
}

结语

这个项目是边学边做的，所以有些注释看起来是多余的，而且有些地方肯定不够好，有时间再学习并实现  用户上传头像功能，搜索并添加好友功能

2022.11.12更新

下面是整个项目的压缩包，需要的可以自取

链接：https://pan.baidu.com/s/1vvN-xUjXGXVjJri4RWofQQ?pwd=vjif 
提取码：vjif

项目里还加了更换头像的功能，不过只适应较低的安卓版本，大概不超过安卓9吧，个别手机系统也不行，比如小米和vivo

这是7月弄的，很就没碰了，最近在弄微信小程序，所以要是有什么问题问我可能答不上来，请见谅文章来源地址https://www.toymoban.com/news/detail-426310.html

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