如何使用LocalBroadcastManager？ [英] how to use LocalBroadcastManager?

问题描述

任何一个可以告诉我怎么用/查找LocalBroadcastManager在<一个描述href="http://developer.android.com/reference/android/support/v4/content/LocalBroadcastManager.html">google文档和服务广播DOC ？

can any one tell me how to use/locate LocalBroadcastManager as described in google docs and Service broadcast doc?

我试图谷歌，但世界上没有code可以开始吗？

i tried to google it, but theres no code available to start with?

该文件说，我应该使用它，如果我想要做内部的广播，在我的应用程序的过程，但我不知道去哪里寻找这个

the documents say that i should use it if i want to do broadcast internally with in my app's process but i dont know where to look for this

任何帮助/对此有何评论？

any help/comment?

更新：我知道如何使用广播，但不知道如何让LocalBroadcastManager可以在我的项目

Update: I know how to use Broadcasts but dont know how to get LocalBroadcastManager available in my project.

推荐答案

我反正回答这个问题。万一有人需要它。

I'll answer this anyway. Just in case someone needs it.

这手表名为事件通知的活动自定义事件名称。

An activity that watches for notifications for the event named "custom-event-name".

@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

发送第二个活动/广播通知。

SenderActivity.java

The second activity that sends/broadcasts notifications.

@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);
}

随着code以上，每一个按钮 R.id.button_send 被点击时，一个目的是广播和接收时间mMessageReceiver 在 ReceiverActivity 。

With the code above, every time the button R.id.button_send is clicked, an Intent is broadcasted and is received by mMessageReceiver in ReceiverActivity.

调试输出应该是这样的：

The debug output should look like this:

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! 

这篇关于如何使用LocalBroadcastManager？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！