如何从扩展另一个类成活动的Java类返回值 [英] How to return values from a java class that extends another class into an Activity

问题描述

让我们说，我有以下主要活动：

Let's say that I've the following main activity:

public class MwConsoleActivity extends Activity {

    private classChild child = null;    

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        child = new classChild();
    }
}

然后考虑的类classChild的执行情况：

Then consider the implementation of the class "classChild":

public class MwBondingAgent extends SapereAgent {

    MwBondingAgent(){}

    public void AddEventListener(childAddedEvent event) {

       //Send the data of event back to the main activity

    }
}

我试图用IntentServices但无法接收值回主要活动。什么是我所采取的方法呢？

I've tried to use IntentServices but was not able to receive the values back to the main activity. What would be the approach I've to take?

干杯 阿里

推荐答案

您可以使用和IntentFilter的侦听广播。 这种添加到活动中：

You can use and intentFilter to listen for broadcasts. Add this to the activity:

 IntentFilter intentFilter = new IntentFilter(
                "com.unique.name");
        mReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                //extract our message from intent
                String msg_for_me = intent.getStringExtra("some_msg");
             }
        };
        //registering our receiver
        this.registerReceiver(mReceiver, intentFilter);

在你的类将它添加到您要通知该活动的一部分：

In your class add this to the part you want to notify the activity:

Intent i = new Intent("com.unique.name").putExtra("some_msg", "I have been updated!");
this.sendBroadcast(i);

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