BroadcastReceiver 最好作为内部类 - Griffin's road to...

BroadcastReceiver 最好作为内部类

文章分类:移动开发

BroadcastReceiver

 

大家对BroadcastReceiver 最熟悉的似乎是：

sendBroadcast(Intent)

registerReceiver(BroadcastReceiver,IntentFilter)

 

 

BroadcastReceiver 作为一个独立的class 会有一些棘手的问题 挡在大家面前

1. 如何把得到的信息返回给某个Thread

2. 代码比较零散 有一些阅读障碍

 

所以说 BroadcastReceiver 最好作为内部类

 

 

[代码]

1. 先定义一些供 Broadcast 与 Message 有关的字串 供BroadcastReceiver使用

public class BroadcastColumn {

    //Broadcast format definition: Broadcast_[destination]
    public final static String BROADCAST_TaskB = "Broadcast_TaskB";

    //Message format definition: Message_[what]
    public final static String MESSAGE_STRING = "Message_string";

}

 

 

 

2. 定义 MessageListenerHelper extends BroadcastReceiver 并把 registerReceiver() 也放入其中

public class MessageListenerHelper extends BroadcastReceiver {
        Context context;

        MessageListenerHelper listener;
        //construct
        public MessageListenerHelper(Context c){
            context = c;

            //to instance it
            listener = this;
        }

        public void registerAction(String action){
            IntentFilter filter = new IntentFilter();
            filter.addAction(action);

            context.registerReceiver(listener,filter);
        }

        @Override
        public void onReceive(Context arg0, Intent arg1) {
            // TODO Auto-generated method stub
            Bundle b = arg1.getExtras();

            if(b.containsKey(BroadcastColumn.MESSAGE_STRING)){
                String string = b.getString(BroadcastColumn.MESSAGE_STRING);
                Log.d("TAG",string);
            }
        }

    }

 

 

3. 定义 MessageListenerHelper 实例 并 注册

MessageListenerHelper listener = new MessageListenerHelper(this);
        listener.registerAction(BroadcastColumn.BROADCAST_TaskB);

 

 

 

 

done!

 

• BroadcastUsage.rar (26.6 KB)
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