服務和BroadCastReceiver

Question

我已經看到了幾個如何實現BroadCastReceiver的例子，但我應該如何實現一個服務，必須對一些待處理的Intent（例如來電）作出反應...... 其實我很想知道但是在一個活動中。但是在一個活動中，你顯然有一個擴展服務或活動的類，所以它不能擴展BroadCastReceiver ... 看起來我們不能製作「平臺感知」服務和/或工作之外的活動？

Answer 1

要註冊的活動收到了一定的意圖您需要：

// Flag if receiver is registered 
private boolean mReceiversRegistered = false; 

// I think this is the broadcast you need for something like an incoming call 
private String INCOMING_CALL_ACTION = "android.intent.action.PHONE_STATE"; 

// Define a handler and a broadcast receiver 
private final Handler mHandler = new Handler(); 
private final BroadcastReceiver mIntentReceiver = new BroadcastReceiver() { 
    @Override 
    public void onReceive(Context context, Intent intent) { 
    // Handle reciever 
    String mAction = intent.getAction(); 

    if(mAction.equals(INCOMING_CALL_ACTION) { 
     // Do your thing 
    } 
} 

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

    // Register Sync Recievers 
    IntentFilter intentToReceiveFilter = new IntentFilter(); 
    intentToReceiveFilter.addAction(INCOMING_CALL_ACTION); 
    this.registerReceiver(mIntentReceiver, intentToReceiveFilter, null, mHandler); 
    mReceiversRegistered = true; 
} 

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

    // Make sure you unregister your receivers when you pause your activity 
    if(mReceiversRegistered) { 
    unregisterReceiver(mIntentReceiver); 
    mReceiversRegistered = false; 
    } 
} 

然後你還需要一個意圖過濾器添加到您的清單：

<activity android:name=".MyActivity" android:label="@string/name" > 
    <intent-filter> 
    <action android:name="android.intent.action.PHONE_STATE" /> 
    </intent-filter> 
</activity> 

Answer 2

您可以創建一個內部類

class A extends Activity { 
BroadcastReceiver r = new BroadcastReceiver(){ 
    // code to handle broadcase 
} 
} 

該類會收到事件，你可以傳遞到主處理器，或者只是調用一些外部方法

Answer 3

其實你可以通過添加監聽器TelephonyManager

你在你的服務定義PhoneStateListener /活動，以來電反應

private PhoneStateListener mPhoneStateListener = new PhoneStateListener() { 

    @Override 
    public void onCallStateChanged(int state, String incomingNumber) { 
     super.onCallStateChanged(state, incomingNumber); 

     switch (state) { 
     case TelephonyManager.CALL_STATE_OFFHOOK: 
        break; 
     case TelephonyManager.CALL_STATE_RINGING: 
        break; 
     case TelephonyManager.CALL_STATE_IDLE: 
        break; 
     } 
    } 

}; 

然後在onCreate方法：

mTelephonyManager = (TelephonyManager) getSystemService(TELEPHONY_SERVICE); 
mTelephonyManager.listen(mPhoneStateListener, PhoneStateListener.LISTEN_CALL_STATE); 

最後你清除onDestroy中的監聽器：

mTelephonyManager.listen(mPhoneStateListener, PhoneStateListener.LISTEN_NONE); 

在這種情況下非常簡單。