服务与一个BroadcastReceiver [英] Service and a BroadCastReceiver

问题描述

我已经看到了如何实现一个BroadcastReceiver几个例子，但是我应该如何实现有反应的​​一些未决的意图（例如呼入电话）服务... 其实我想知道同样的问题，但在活动.. 你明明有延伸服务或活动）的一类，因此它不能也延长了BroadcastReceiver ... 看起来，我们不能让平台意识服务和/或工作之外的活动？

I have seen several examples of how to implement a BroadCastReceiver, but how should I implement a Service that has to react to some pending Intent (for example incoming phone call)... Actually I was wondering about the same "problem" but in an Activity.. You obviously have a class which extends a Service or an Activity) so it cannot also extend BroadCastReceiver... It looks like we cannot make "platform-aware" services and/or Activties?

推荐答案

要注册一个活动，收到一定的目的，你需要：

To register an activity to receive a certain intent you need to:

// 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;
  }
}

然后，你还需要增加一个意图过滤器，以你的清单：

Then you will also need to add an intent-filter to your manifest:

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

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