如何使用LocalBroadcastManager？

Question

如何使用/定位LocalBroadcastManager，如谷歌文档和服务广播文档所述

我试着用谷歌搜索，但一开始没有可用的代码吗？

文件上说，如果我想在我的应用程序的过程中进行内部广播，我应该使用它，但我不知道在哪里可以找到它。

有什么帮助/评论吗？

更新：我知道如何使用广播，但不知道如何使LocalBroadcastManager在我的项目中可用。

Answer 1

无论如何我都会回答的。以防万一有人需要。

ReceiverActivity.java

监视名为"custom-event-name"的事件的通知的活动。

@Override
public void onCreate(Bundle savedInstanceState) {

  ...

  // Register to receive messages.
  // We are registering an observer (mMessageReceiver) to receive Intents
  // with actions named "custom-event-name".
  LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver,
      new IntentFilter("custom-event-name"));
}

// Our handler for received Intents. This will be called whenever an Intent
// with an action named "custom-event-name" is broadcasted.
private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
  @Override
  public void onReceive(Context context, Intent intent) {
    // Get extra data included in the Intent
    String message = intent.getStringExtra("message");
    Log.d("receiver", "Got message: " + message);
  }
};

@Override
protected void onDestroy() {
  // Unregister since the activity is about to be closed.
  LocalBroadcastManager.getInstance(this).unregisterReceiver(mMessageReceiver);
  super.onDestroy();
}

SenderActivity.java

发送/广播通知的第二个活动。

@Override
public void onCreate(Bundle savedInstanceState) {

  ...

  // Every time a button is clicked, we want to broadcast a notification.
  findViewById(R.id.button_send).setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
      sendMessage();
    }
  });
}

// Send an Intent with an action named "custom-event-name". The Intent sent should 
// be received by the ReceiverActivity.
private void sendMessage() {
  Log.d("sender", "Broadcasting message");
  Intent intent = new Intent("custom-event-name");
  // You can also include some extra data.
  intent.putExtra("message", "This is my message!");
  LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
}

使用上面的代码，每次单击按钮R.id.button_send时，mMessageReceiver都会在ReceiverActivity中广播和接收意图。

调试输出应该如下所示：

01-16 10:35:42.413: D/sender(356): Broadcasting message
01-16 10:35:42.421: D/receiver(356): Got message: This is my message! 

Answer 2

我宁愿全面回答。

1. LocalbroadcastManager包含在Android3.0和更高版本中，所以您必须使用支持库v4进行早期发布。见指令这里
2. 创建广播接收器： 私有BroadcastReceiver onNotice=新BroadcastReceiver() { @Override void onReceive(上下文上下文，意图){ //意图可以包含anydata Log.d("sohail"，"onReceive called")；tv.setText(“广播接收!")；}；
3. 在活动的onResume中注册您的接收器，例如： 受保护的onResume() { super.onResume()；IntentFilter iff= new IntentFilter(MyIntentService.ACTION)；IntentFilter iff；}//MyIntentServices.ACTION只是在MyIntentService中定义的公共静态字符串。
4. unRegister接收机在onPause中： 保护的onPause() { super.onPause()；super.onPause}
5. 现在，每当从应用程序的活动或服务发送本地广播时，将调用onReceive of onNotice :)。

编辑:您可以在这里阅读完整的教程，LocalBroadcastManager:内部应用程序消息传递

Answer 3

接收端的：

• 第一寄存器LocalBroadcast接收机
• 然后在onReceive中处理传入的意图数据。 @重载受保护的savedInstanceState(Bundle savedInstanceState) { super.onCreate(savedInstanceState)；LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(this)；lbm.registerReceiver(接收者，新的IntentFilter("filter_string"))；} public BroadcastReceiver receiver =新BroadcastReceiver() {@重载公共void (上下文，意图){ if (意图!= null) { String str = intent.getStringExtra("key")；//从意图中获取所有数据，并执行您想要的} }；

发送端的：

   Intent intent = new Intent("filter_string");
   intent.putExtra("key", "My Data");
   // put your all data using put extra 

   LocalBroadcastManager.getInstance(this).sendBroadcast(intent);