Android开发拍照+读取相册+保存到本地-Toy模板网

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Android Studio 新建项目，Minimum SDK选择API 28: android 9.0（Pie），在华为Mate20 Pro 测试通过。

AndroidManifest.xml中添加注册

注册除了MainActivity的其他两个界面Albums和Camera，添加provider，申请使用相机的权限，读写权限

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

    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.Mycamera"
        tools:targetApi="31">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>

            <meta-data
                android:name="android.app.lib_name"
                android:value="" />
        </activity>
        <activity android:name="Albums"></activity>
        <activity android:name="Camera"></activity>

        <provider
            android:name="androidx.core.content.FileProvider"
            android:authorities="com.example.lenovo.cameraalbumtest.fileprovider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_path" />
        </provider>
    </application>

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


</manifest>

activity_main.xml代码

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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=".MainActivity">
    <Button
        android:id="@+id/take_photo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="拍照"
        android:textSize="20dp" />
    <Button
        android:id="@+id/choose_from_album"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="相册"
        android:layout_below="@+id/take_photo"
        android:textSize="20dp"
        />
    <ImageView
        android:id="@+id/picture"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_below="@+id/choose_from_album"
        android:layout_marginTop="20dp" />
</RelativeLayout>

MainActivity.java代码

package com.example.mycamera;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;


public class MainActivity extends AppCompatActivity {
    public static final int TAKE_PHOTO = 1;
    public static final int CHOOSE_PHOTO = 2;
    private ImageView picture;
    private Intent intent1,intent2;

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

        Button chooseFromAlbum = findViewById(R.id.choose_from_album);
        chooseFromAlbum.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                    ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, CHOOSE_PHOTO);
                } else {
                    openAlbum();//打开album的界面
                }
            }
        });
        Button takePhoto = findViewById(R.id.take_photo);
        picture = findViewById(R.id.picture);

        takePhoto.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 动态申请权限
                if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
                    ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CAMERA}, TAKE_PHOTO);
                } else {
                    // 启动相机程序
                    startCamera();
                }
            }
        });
        intent1=new Intent(this,Albums.class);//创建跳转到Albums显示的窗口的Intent
        intent2=new Intent(this,Camera.class);//创建跳转到Camera显示的窗口的Intent
    }

    private void openAlbum() {
        startActivity(intent1);//进入album的窗口界面
    }
    private void startCamera() {
        startActivity(intent2);//进入camera的窗口界面
    }
}

albums.xml代码

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <Button
        android:id="@+id/pestDetection"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="50dp"
        android:layout_marginTop="20dp"
        android:text="图像检测"
        android:textSize="20dp" />

    <Button
        android:id="@+id/pictureSave"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:text="保存图像"
        android:layout_toRightOf="@+id/pestDetection"
        android:layout_marginLeft="80dp"
        android:textSize="20dp" />

    <ImageView
        android:id="@+id/picture"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/pictureSave"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp" />

</RelativeLayout>

Albums.java代码

package com.example.mycamera;

import android.Manifest;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

import androidx.annotation.Nullable;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class Albums extends Activity {
    private  ImageView albumsPicture;
    public static final int CHOOSE_PHOTO = 2;
    private Button pestDection=null;
    private Button pictureSave=null;
    private Intent intent2;


    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.albums);
        pestDection=super.findViewById(R.id.pestDetection);
        pictureSave=super.findViewById(R.id.pictureSave);
        albumsPicture = super.findViewById(R.id.picture);

        if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, CHOOSE_PHOTO);
        } else {
            openAlbum();
        }

        intent2 = new Intent(getApplicationContext(),MainActivity.class);
        //receivePicturefromMainActivaty();
        pestDection.setOnClickListener(new pestDectionFuntion());
        pictureSave.setOnClickListener(new pictureSaveFunction());

    }

    private void openAlbum() {
        Intent intent = new Intent("android.intent.action.GET_CONTENT");
        intent.setType("image/*");
        startActivityForResult(intent, CHOOSE_PHOTO);//打开相册
    }
    private class pestDectionFuntion implements View.OnClickListener {
        public void onClick(View view){
            Toast.makeText(getApplicationContext(),"粮虫检测",Toast.LENGTH_SHORT).show();
        }
    }
    private class pictureSaveFunction implements View.OnClickListener {
        public void onClick(View view){
            //Toast.makeText(getApplicationContext(),"图片保存成功！",Toast.LENGTH_SHORT).show();
            //Intent intent2 = new Intent(getApplicationContext(),MainActivity.class);//创建窗口切换的Intent,MainActivity.class指切换到主界面
            //Bitmap savepicture=loadBitmapFromView(albumsPicture);
            //String name=String.valueOf(System.currentTimeMillis());
            BitmapDrawable bmpDrawable = (BitmapDrawable) albumsPicture.getDrawable();
            Bitmap bitmap = bmpDrawable.getBitmap();
            saveToSystemGallery(bitmap);//将图片保存到本地
            Toast.makeText(getApplicationContext(),"图片保存成功！",Toast.LENGTH_SHORT).show();
            startActivity(intent2);//窗口切换
        }
    }
    public void saveToSystemGallery(Bitmap bmp) {
        // 首先保存图片
        File appDir = new File(Environment.getExternalStorageDirectory(), "MyAlbums");
        if (!appDir.exists()) {
            appDir.mkdir();
        }
        String fileName = System.currentTimeMillis() + ".jpg";
        File file = new File(appDir, fileName);
        try {
            FileOutputStream fos = new FileOutputStream(file);
            bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
            fos.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        // 其次把文件插入到系统图库

        //sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse(file.getAbsolutePath())));
        Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        Uri uri = Uri.fromFile(file);
        intent.setData(uri);
        sendBroadcast(intent); // 发送广播，通知图库更新
    }
    // 使用startActivityForResult()方法开启Intent的回调
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        //返回成功，请求码（对应启动时的requestCode）
        if(resultCode == RESULT_OK && CHOOSE_PHOTO == 2)
        {
            //方式一（不建议使用）
            //下面的一句代码，也可以把图片显示在ImageView中
            //但图片过大的时候，将无法显示，所以
            //img.setImageURI(data.getData());

            //方式二
            Uri uri = data.getData();
            ContentResolver cr = this.getContentResolver();
            try {
                //根据Uri获取流文件
                InputStream is = cr.openInputStream(uri);
                BitmapFactory.Options options = new BitmapFactory.Options();
                options.inSampleSize =3;
                Bitmap bitmap = BitmapFactory.decodeStream(is,null,options);
                albumsPicture.setImageBitmap(bitmap);
            }
            catch(Exception e)
            {
                Log.i("lyf", e.toString());
            }
        }
        super.onActivityResult(requestCode, resultCode, data);
    }


    @TargetApi(19)
    private void handleImageOnKitkat(Intent data) {
        String imagePath = null;
        Uri uri = data.getData();
        if (DocumentsContract.isDocumentUri(this, uri)) {
            //如果是document类型的uri，则通过document id处理
            String docId = DocumentsContract.getDocumentId(uri);
            if ("com.android.providers.media.documents".equals(uri.getAuthority())) {
                String id = docId.split(":")[1];
                String selection = MediaStore.Images.Media._ID + "=" + id;
                imagePath = getImagePath( MediaStore.Images.Media.EXTERNAL_CONTENT_URI, selection);
            } else if ("com.android.providers.downloads.documents".equals(uri.getAuthority())) {
                Uri contentUri = ContentUris.withAppendedId(Uri.parse("content:" +
                        "//downloads/public_downloads"), Long.valueOf(docId));
                imagePath = getImagePath(contentUri, null);
            }
        } else if ("content".equalsIgnoreCase(uri.getScheme())) {
            //如果是content类型的uri，则使用普通方式处理
            imagePath = getImagePath(uri, null);
        } else if ("file".equalsIgnoreCase(uri.getScheme())) {
            //如果是File类型的uri，直接获取图片路径即可
            imagePath = uri.getPath();
        }
        //根据图片路径显示图片
        displayImage(imagePath);
    }

    private void handleImageBeforeKitKat(Intent data){
        Uri uri=data.getData();
        String imagePath=getImagePath(uri,null);
        displayImage(imagePath);
    }
    private String getImagePath(Uri uri,String selection){
        String path=null;
        Cursor cursor=getContentResolver().query(uri,null,selection,null,null);
        if(cursor!=null){
            if(cursor.moveToFirst()){
                path=cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
            }
            cursor.close();
        }
        return path;
    }
    private void displayImage(String imagePath){
        if(imagePath!=null){
            Bitmap bitmap=BitmapFactory.decodeFile(imagePath);
            albumsPicture.setImageBitmap(bitmap);//将图片放置在控件上
        }else {
            Toast.makeText(this,"得到图片失败",Toast.LENGTH_SHORT).show();
        }
    }
}

camera.xml代码

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <Button
        android:id="@+id/pestDetection"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="50dp"
        android:layout_marginTop="20dp"
        android:text="图像检测"
        android:textSize="20dp" />

    <Button
        android:id="@+id/pictureSave"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:text="保存图像"
        android:layout_toRightOf="@+id/pestDetection"
        android:layout_marginLeft="80dp"
        android:textSize="20dp" />

    <ImageView
        android:id="@+id/picture"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/pictureSave"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp" />

</RelativeLayout>

Camera.java代码

package com.example.mycamera;

import android.Manifest;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.core.content.FileProvider;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class Camera extends Activity {
    private ImageView cameraPicture;
    public static final int TAKE_PHOTO = 1;
    private Button pestDection=null;
    private Button pictureSave=null;
    private Intent intent3;
    private Uri imageUri;


    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.albums);
        pestDection=super.findViewById(R.id.pestDetection);
        pictureSave=super.findViewById(R.id.pictureSave);
        cameraPicture = super.findViewById(R.id.picture);

        // 创建一个File对象，用于保存摄像头拍下的图片，这里把图片命名为output_image.jpg
        // 并将它存放在手机SD卡的应用关联缓存目录下
        File outputImage = new File(getExternalCacheDir(), "output_image.jpg");
        // 对照片的更换设置
        try {
            // 如果上一次的照片存在，就删除
            if (outputImage.exists()) {
                outputImage.delete();
            }
            // 创建一个新的文件
            outputImage.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
        // 如果Android版本大于等于7.0
        if (Build.VERSION.SDK_INT >= 24) {
            // 将File对象转换成一个封装过的Uri对象
            imageUri = FileProvider.getUriForFile(this, "com.example.lenovo.cameraalbumtest.fileprovider", outputImage);
            Log.d("MainActivity", outputImage.toString() + "手机系统版本高于Android7.0");
        } else {
            // 将File对象转换为Uri对象，这个Uri标识着output_image.jpg这张图片的本地真实路径
            Log.d("MainActivity", outputImage.toString() + "手机系统版本低于Android7.0");
            imageUri = Uri.fromFile(outputImage);
        }
        // 动态申请权限
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions( this, new String[]{Manifest.permission.CAMERA}, TAKE_PHOTO);
        } else {
            // 启动相机程序
            startCamera();
        }

        intent3 = new Intent(getApplicationContext(),MainActivity.class);
        pestDection.setOnClickListener(new Camera.pestDectionFuntion());
        pictureSave.setOnClickListener(new Camera.pictureSaveFunction());

    }
    private void startCamera() {
        Intent intent4 = new Intent("android.media.action.IMAGE_CAPTURE");
        // 指定图片的输出地址为imageUri
        intent4.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
        startActivityForResult(intent4, TAKE_PHOTO);
    }

    private class pestDectionFuntion implements View.OnClickListener {
        public void onClick(View view){
            Toast.makeText(getApplicationContext(),"粮虫检测",Toast.LENGTH_SHORT).show();
        }
    }
    private class pictureSaveFunction implements View.OnClickListener {
        public void onClick(View view){
            BitmapDrawable bmpDrawable = (BitmapDrawable) cameraPicture.getDrawable();
            Bitmap bitmap = bmpDrawable.getBitmap();
            saveToSystemGallery(bitmap);//将图片保存到本地
            Toast.makeText(getApplicationContext(),"图片保存成功！",Toast.LENGTH_SHORT).show();
            startActivity(intent3);//窗口切换
        }
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        switch (requestCode) {
            case TAKE_PHOTO:
                if (requestCode == TAKE_PHOTO && resultCode == RESULT_OK ) {
                    try {
                        // 将图片解析成Bitmap对象
                        Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));
                        cameraPicture.setImageBitmap(bitmap);
                    } catch (FileNotFoundException e) {
                        e.printStackTrace();
                    }
                }
                break;
            default:
                break;
        }
    }
    public void saveToSystemGallery(Bitmap bmp) {
        // 首先保存图片
        File appDir = new File(Environment.getExternalStorageDirectory(), "Mycamera");
        if (!appDir.exists()) {
            appDir.mkdir();
        }
        String fileName = System.currentTimeMillis() + ".jpg";
        File file = new File(appDir, fileName);
        try {
            FileOutputStream fos = new FileOutputStream(file);
            bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
            fos.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        // 其次把文件插入到系统图库

        //sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse(file.getAbsolutePath())));
        Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        Uri uri = Uri.fromFile(file);
        intent.setData(uri);
        sendBroadcast(intent);// 发送广播，通知图库更新
    }
}

file_path.xml代码

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path
        name="my_images"
        path="." />
</paths>

如果虚拟机可以运行，手机不能安装，gradle.properties里面添加

android.injected.testOnly=false

文件结构

Android开发拍照+读取相册+保存到本地
总结

https://wwzb.lanzoue.com/imUKH0n1nq4d
密码:1eda

分享Demo可试试效果

参考来源：
Android studio调用手机相机拍照显示并保存+读取本地相册并显示_金子007的博客-CSDN博客_android sttudio查看手机相册
Android ImageView显示本地图片 - 末日之花 - 博客园文章来源地址https://www.toymoban.com/news/detail-453928.html

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