android_mars老师_蓝牙学习-Toy模板网

这篇具有很好参考价值的文章主要介绍了android_mars老师_蓝牙学习。希望对大家有所帮助。如果存在错误或未考虑完全的地方，请大家不吝赐教，您也可以点击"举报违法"按钮提交疑问。

MainActivity

package com.example.bluetooth2;

import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.nsd.NsdManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {
    private Button discoveryButton = null;
    private Button scanButton = null;
    private BluetoothReceiver bluetoothReceiver = null;
    private BluetoothAdapter bluetoothAdapter = null;

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

        discoveryButton = (Button) findViewById(R.id.discoveryButtonId);
        discoveryButton.setOnClickListener(new DiscoveryButtonListener());

        IntentFilter intentFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
        bluetoothReceiver = new BluetoothReceiver();
        //注册广播接收器
        registerReceiver(bluetoothReceiver,intentFilter);
        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        scanButton = (Button) findViewById(R.id.scanButtonId);
        System.out.println(scanButton);
        scanButton.setOnClickListener(new ScanButtonListener());

    }
    private class BluetoothReceiver extends BroadcastReceiver{
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if(BluetoothDevice.ACTION_FOUND.equals(action)){
                //可以从收到的Intent对象中，将代表远程蓝牙适配器的对象取出
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                System.out.println(device.getAddress());
            }
        }
    }
    //修改蓝牙设备可见性
    private class DiscoveryButtonListener implements View.OnClickListener{
        @SuppressLint("MissingPermission")
        @Override
        public void onClick(View v) {
            Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
            //蓝牙设备可见性时间应小于300s,否则直接被300s覆盖。---》虽设置成500s，实际上就是300s.
            discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION,500);
            startActivity(discoverableIntent);
        }
    }
    private class ScanButtonListener implements View.OnClickListener{
        @SuppressLint("MissingPermission")
        @Override
        public void onClick(View v) {
            bluetoothAdapter.startDiscovery();
        }
    }

    @Override
    protected void onDestroy(){
        unregisterReceiver(bluetoothReceiver);
        super.onDestroy();
    }
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.example.bluetooth2">

    <uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" />
    <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.Bluetooth2"
        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>
        </activity>
    </application>
    <uses-permission android:name="android.permission.BLUETOOTH"/>
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
</manifest>

activity_main.xml

<?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=".MainActivity">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="设置可见性"
        android:id="@+id/discoveryButtonId"
        app:layout_constraintTop_toTopOf="parent"
        tools:ignore="MissingConstraints" />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/scanButtonId"
        android:text="扫描文件"
        tools:ignore="MissingConstraints" />

</androidx.constraintlayout.widget.ConstraintLayout>