Android BroadcastReceiver 永远不会被调用

Question

我想实现一个处理屏幕开/关的服务。为此，我创建了 BootReceiver，它会在启动完成时调用并在其中启动我的服务。但是，我的 ScreenBroadcastReceiver 从未被调用，为什么？我是不是在错误的地方注册了它，我是在创建服务时做的...请帮我在哪里注册？

因此，该应用程序应在后台运行(无用户交互)并且它将记录屏幕打开和关闭 Activity 。我已经启动了这些代码，但似乎我需要注册我的 ScreenBroadcastReceiver 广播接收器。如果我在服务的创建时这样做。我应该改变它吗？我的最终目标是在后台运行这个应用程序，这样应用程序就可以在没有用户交互的情况下运行

这是最开始调用的BootReceiver:

public class BootReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {

        Log.w("TAG", "BootReceiver");

        Intent service = new Intent(context, ScreenListenerService.class);
            context.startService(service);

    }

}

这是服务:

public class ScreenListenerService extends Service {


public void onCreate(){
    super.onCreate();
    Log.w("TAG", "ScreenListenerService---OnCreate ");

            IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
    filter.addAction(Intent.ACTION_SCREEN_OFF);
    BroadcastReceiver screenOnReceiver = new ScreenBroadcastReceiver();
    registerReceiver(screenOnReceiver, filter);
}


 @Override
 public int onStartCommand(Intent intent, int flags, int startId) {

        Log.w("TAG", "ScreenListenerService---onStart ");

         return START_STICKY;
    }

@Override
public IBinder onBind(Intent intent) {
    // TODO Auto-generated method stub
    return null;
}

}

这是 ScreenBroadcastReceiver:

public class ScreenBroadcastReceiver extends BroadcastReceiver {

   ///this part is never called, even if the screen is turned on/off.
    public static boolean screenOff;

    @Override
    public void onReceive(Context context, Intent intent) {

        if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {

            screenOff = true;
            System.out.println("SCREEN TURNED OFF on BroadcastReceiver");
        } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {

            screenOff = false;
            System.out.println("SCREEN TURNED ON on BroadcastReceiver");
        }
        Intent i = new Intent(context, ScreenListenerService.class);
        i.putExtra("screen_state", screenOff);
        context.startService(i);

    }

}

和 list :

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.test"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="10" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".main"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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


         <service android:name=".ScreenListenerService"></service>

        <receiver android:name=".BootReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
                 <action android:name="android.intent.action.ACTION_EXTERNAL_APPLICATIONS_AVAILABLE" />
            </intent-filter>
        </receiver>

    </application>

</manifest>

更新:可以在模拟器中测试这段代码并让我知道结果吗？

Answer 1

在 onStart() 方法中注册您的 BroadcastReceiver

@Override
public void onStart(Intent intent, int startId) {
    try {

        IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
        filter.addAction(Intent.ACTION_SCREEN_OFF);
        BroadcastReceiver mReceiver = new ScreenReceiver();
        registerReceiver(mReceiver, filter);

    } catch (Exception e) {
    }
}