爲什麼我的BroadcastReceiver不起作用？

Question

我在學習使用Android BroadcasReceiver。 我寫了這段代碼，但它不工作...我嘗試了例如改變時間等... 這是什麼錯誤？

我在清單補充說：

<receiver android:name="com.example.broadcastreceiverspike.Broadcast" > 
     <intent-filter android:priority="100"> 
      <action android:name="android.intent.action.ACTION_SCREEN_ON" /> 
      <action android:name="android.intent.action.ACTION_SCREEN_OFF" /> 
      <action android:name="android.intent.action.TIME_SET" /> 
     </intent-filter> 
</receiver> 

我簡單BroadcasReceiver：

public class Broadcast extends BroadcastReceiver { 
     @Override 
     public void onReceive(Context context, Intent intent) { 
      Log.d("BROADCAST", "It worked"); 
      Toast.makeText(context, "BROADCAST", Toast.LENGTH_LONG).show(); 
     } 
} 

我的主要活動（默認的主活動）

public class MainActivity extends Activity { 

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

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 

} 

Answer 1

我解決了！

「與其他廣泛流傳的意圖不同，對於Intent.ACTION_SCREEN_OFF和Intent.ACTION_SCREEN_ON，您無法在Android清單中聲明它們！我不知道確切原因，但他們必須在IntentFilter的在Java代碼中」

http://thinkandroid.wordpress.com/2010/01/24/handling-screen-off-and-screen-on-intents/

清單登記

<receiver android:name=".Broadcast" > 
     <intent-filter>     
      <action android:name="android.intent.action.TIME_SET" /> 

     </intent-filter> 
    </receiver> 

主要活動類

公共類MainActivity擴展活動{

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

    // INITIALIZE RECEIVER 
    IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON); 
    filter.addAction(Intent.ACTION_SCREEN_OFF); 
    BroadcastReceiver mReceiver = new Broadcast(); 
    registerReceiver(mReceiver, filter); 

} 

}

我的廣播接收機

公共類廣播延伸的BroadcastReceiver {

public static String TAG = "BROADCAST"; 

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

    if (intent.getAction().equals(Intent.ACTION_TIME_CHANGED)) 
    { 
     Log.d(TAG, "BROADCAST Cambio di orario"); 
     Toast.makeText(context, "BROADCAST Cambio di orario", Toast.LENGTH_LONG).show(); 
    } 
    else if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) { 
     // DO WHATEVER YOU NEED TO DO HERE 
     Log.d(TAG, "BROADCAST Screen OFF"); 
     Toast.makeText(context, "Screen OFF", Toast.LENGTH_LONG).show(); 
    } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) { 
     // AND DO WHATEVER YOU NEED TO DO HERE 
     Log.d(TAG, "BROADCAST Screen ON"); 
     Toast.makeText(context, "BROADCAST Screen ON", Toast.LENGTH_LONG).show(); 
    } 
} 

}

Answer 2

退房this tutorial關於廣播接收機。

更新： 我不知道你正在使用本教程中，因爲有很多有用的東西在本教程中，像這樣：

@Override 
public void onResume() { 
    super.onResume(); 

    // Register mMessageReceiver to receive messages. 
    LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver, 
     new IntentFilter("my-event")); 
    } 

    // handler for received Intents for the "my-event" event 
    private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() { 
     @Override 
     public void onReceive(Context context, Intent intent) { 
     // Extract data included in the Intent 
     String message = intent.getStringExtra("message"); 
     Log.d("receiver", "Got message: " + message); 
    } 
}; 

@Override 
protected void onPause() { 
    // Unregister since the activity is not visible 
    LocalBroadcastManager.getInstance(this).unregisterReceiver(mMessageReceiver); 
    super.onPause(); 
} 

換句話說，你已經創建一個自定義broadcast receiver class，但你沒有使用它。

也請檢查this。

Answer 3

您是否添加了所需的錄像？

使用的許可機器人：名稱=「android.permission.READ_PHONE_STATE」

這是一個接收器來處理屏幕關閉時或上或鎖定：

public class ScreenReceiver extends BroadcastReceiver { 

@Override 
public void onReceive(Context context, Intent intent) 
{ 
    if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) 
    { 



    } 
    else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) 
    { 


    } 
    else if(intent.getAction().equals(Intent.ACTION_USER_PRESENT)) 
    { 

    } 

} 

} 這是清單：

<receiver android:name=".ScreenReceiver"> 
     <intent-filter> 
      <action android:name="android.intent.action.USER_PRESENT" />   
    <action android:name="android.intent.action.SCREEN_OFF" /> 
    <action android:name="android.intent.action.SCREEN_ON" /> 

     </intent-filter> 
    </receiver> 

Answer 4

我有同樣的問題，我固定它（在4.3和5.1測試）。我能夠在清單中聲明「android.intent.action.USER_PRESENT」，只要你有READ_PHONE_STATE權限，那就OK！我的迷你應用程序由一個廣播接收器組成，可以響應屏幕開/關狀態，並運行連續語音識別的後臺服務。如果屏幕關閉，則關閉識別功能。下面是代碼，即可享受：清單：

<uses-permission android:name="android.permission.READ_PHONE_STATE"/> <receiver android:name="classes.VoiceLaunchReceiver" > 
      <intent-filter>     
       <action android:name="android.intent.action.USER_PRESENT" />  
       <action android:name="android.intent.action.BOOT_COMPLETED" /> 
       <category android:name="android.intent.category.DEFAULT" /> 
      </intent-filter> 
     </receiver> 

廣播接收器：

public class VoiceLaunchReceiver extends BroadcastReceiver { 
    @Override 
    public void onReceive(Context ctx, Intent intent) {  
     Intent service = new Intent(ctx, VoiceLaunchService.class); 
    // service.putExtra(action, true); 
     Log.i("joscsr","Incoming Voice Launch Broadcast..."); 

     if (intent.getAction().equals(Intent.ACTION_USER_PRESENT)) { 
      Log.i("joshcsr", "************\nCSR Resumed (BC)\n************"); 
      ctx.startService(service); 
      } 
     if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) { 
      Log.i("joshcsr", "************\nCSR STOPPED by SCREEN (BC)\n************"); 
      ctx.stopService(service); 
      } 
     } 
} 

你可以想像，我USER_PRESENT廣播接收器沒有註冊任何其他地方。我在我的服務的onCreate方法中註冊了ACTION_SCREEN_OFF和ON，這是我的接收方觸發的。

@Override 
public void onCreate() { 
    super.onCreate(); 
    //Register screen ON/OFF BroadCast 
    launcher=new VoiceLaunchReceiver(); 
    IntentFilter i=new IntentFilter(Intent.ACTION_SCREEN_OFF); 
    i.addAction(Intent.ACTION_SCREEN_ON);    
    registerReceiver(launcher,i); 
    Log.d("joshcsr","VoiceLaunch Service CREATED"); 
    } 

最後我註銷屏幕開/關中的onDestroy（）我公司的服務：

@Override 
    public void onDestroy() { 
     super.onDestroy(); 
     unregisterReceiver(launcher);}