知乎专栏 |
Android Studio 选择 File - New - Other - Broadcast Receiver
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="cn.netkiller.broadcast"> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" /> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <receiver android:name=".MyReceiver" android:enabled="true" android:exported="true"> <intent-filter> <action android:name="android.intent.action.BOOT_COMPLETED" /> </intent-filter> </receiver> </application> </manifest>
MyReceiver 集成 BroadcastReceiver 在 onReceive 中写入你的业务逻辑。
package cn.netkiller.broadcast; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.widget.Toast; public class MyReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { Toast.makeText(context, "程序已启动,接收到系统启动广播", Toast.LENGTH_SHORT).show(); } }
现在重启 Android 模拟器,启动后虽然 App 并没有进入,但是屏幕底部会看到 "程序已启动,接收到系统启动广播"
静态注册
<receiver android:name=".receiver.StaticBroadcastReceiver" android:enabled="true" android:exported="true"> <intent-filter android:priority="1000"> <action android:name="android.intent.action.BOOT_COMPLETED" /> <action android:name="android.intent.action.ACTION_BATTERY_CHANGED" /> <action android:name="android.intent.action.ACTION_BATTERY_LOW" /> <action android:name="android.intent.action.ACTION_BATTERY_OKAY" /> <action android:name="android.intent.action.ACTION_POWER_CONNECTED" /> <action android:name="android.intent.action.ACTION_POWER_DISCONNECTED" /> <category android:name="android.intent.category.DEFAULT" /> </intent-filter> </receiver>
动态注册
IntentFilter filter = new IntentFilter(); filter.addAction(Intent.ACTION_BATTERY_CHANGED); filter.addAction(Intent.ACTION_BATTERY_LOW); filter.addAction(Intent.ACTION_BATTERY_OKAY); filter.addAction(Intent.ACTION_POWER_CONNECTED); filter.addAction(Intent.ACTION_POWER_DISCONNECTED);
Android 8 以上,静态广播必须指定包名 intent.setPackage(context.getPackageName());
public static void broadcastTest(String message) { Log.d(TAG, "发送广播: " + message); Context context = ContextHolder.getContext(); Intent intent = new Intent(); intent.setAction("test.broadcast"); intent.setPackage(context.getPackageName()); intent.putExtra("message", message); context.sendBroadcast(intent); }