应用关闭后，广播接收器无法正常工作 [英] Broadcast receiver not working when app is closed

问题描述

所以我制作了两个不同的应用程序，一个发送广播，另一个接收它并显示吐司.但是，当我关闭接收方应用程序时，即使我在清单文件中定义了接收方，第二个应用程序也不再接收广播.

So I have two different apps made, one sends a broadcast and another receives it and displays a toast. However, when I close the receiver app the broadcast is no longer received by the second app even though I defined the receiver in the manifest file.

app1的MainActivity中的广播发送者.

The broadcast sender in the MainActivity of app1.

public class MainActivity extends AppCompatActivity {

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

    Button b = (Button)findViewById(R.id.button2);
    b.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i = new Intent();
            i.setAction("com.example.ali.rrr");
            i.addFlags(Intent.FLAG_INCLUDE_STOPPED_PACKAGES);
            sendBroadcast(i);
            Log.e("Broadcast","sent");
        }
    });
}

App 2广播接收器:

App 2 broadcast receiver:

public class MyReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
    // TODO: This method is called when the BroadcastReceiver is receiving
    // an Intent broadcast.
    Toast.makeText(context, "Broadcast has been recieved!", Toast.LENGTH_SHORT).show();
    Log.e("SUCCESS", "IN RECIEVER");
    //throw new UnsupportedOperationException("Not yet implemented");
}

App 2s清单:

<?xml version="1.0" encoding="utf-8"?>

<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">
    <receiver
        android:name=".MyReceiver"
        android:enabled="true"
        android:exported="true">
        <intent-filter>
            <action android:name="com.example.ali.rrr" />
        </intent-filter>
    </receiver>

    <activity
        android:name=".MainActivity"
        android:label="@string/title_activity_main"
        android:theme="@style/AppTheme.NoActionBar" />
    <activity
        android:name=".Main2Activity"
        android:label="@string/title_activity_main2"
        android:theme="@style/AppTheme.NoActionBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

推荐答案

首先，您需要使用服务才能使用此功能.

First of all you need to use the Service for this functionality to work.

在活动"中，您可以使用以下代码启动和停止服务.

In the Activity you can start and stop the service by using the below codes.

//to start a service
Intent service = new Intent(context, MyBrodcastRecieverService.class);
context.startService(service);

//to Stop service
Intent service = new Intent(context, MyBrodcastRecieveService.class);
context.stopService(service);

然后您可以使用以下服务

Then you can use the below service

public class MyBrodcastRecieveService extends Service
{
 private static BroadcastReceiver br_ScreenOffReceiver;

 @Override
 public IBinder onBind(Intent arg0)
 {
  return null;
 }

 @Override
 public void onCreate()
 {
  registerScreenOffReceiver();
 }

 @Override
 public void onDestroy()
 {
  unregisterReceiver(br__ScreenOffReceiver);
  m_ScreenOffReceiver = null;
 }

 private void registerScreenOffReceiver()
 {
  br_ScreenOffReceiver = new BroadcastReceiver()
  {
   @Override
   public void onReceive(Context context, Intent intent)
   {
     Log.d(TAG, "ACTION_SCREEN_OFF");
     // do something, e.g. send Intent to main app
   }
  };
  IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_OFF);
  registerReceiver(br_ScreenOffReceiver, filter);
 }
}

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