服务和广播接收器 [英] Service and a BroadCastReceiver

问题描述

我已经看到了几个关于如何实现 BroadCastReceiver 的示例，但是我应该如何实现一个必须对某些挂起的 Intent(例如来电)做出反应的服务...其实我想知道同样的问题"，但在一个活动中..您显然有一个扩展服务或活动的类)，因此它也不能扩展 BroadCastReceiver ...看起来我们无法制作平台感知"服务和/或活动?

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 Activity 以接收特定意图，您需要:

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，您还需要在清单中添加一个意图过滤器:

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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