java是否可以将事件从线程发送到活动？

Question

如果我想从线程向活动发送事件（例如OnClick）？谢谢

预期的工作流程如下：

public class HelloAndroid extends Activity {

   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       Crate threadA
       Start threadA
   }

   public void OnSomeEvent() {
       do something that changes the views in this activity;
   }

   private class ThreadA extends Thread {
       public void run() {
           do something ...

           Send Some Event to Activity HelloAndroid.
       }
   }

Answer 1

如果我理解正确，您希望从内部ThreadA类调用HelloAndroid的方法OnSomeEvent()，对吗

如果是这种情况，您可以纠正：

private class ThreadA extends Thread {
    public void run() {
        HelloAndroid.this.OnSomeEvent();
    }
}

或者更简单，直接调用OnSomeEvent()方法

Answer 2

所有与UI相关的事件都必须从UI线程执行。 http://developer.android.com/guide/appendix/faq/commontasks.html#threading

Answer 3

您必须使用处理程序来更新UI

Answer 4

您始终可以从线程向活动发送消息，如下所示：

//this should be in your Activity class
private Handler SomeHandler = new Handler() {
    public void handleMessage(Message msg) {
        ReactOnMessage();
    }
};


private class SomeThread implements Runnable {
    public void run() {
        doSomething();
        SomeHandler.sendEmptyMessage(0);
    }
}

您还可以创建包含一些值的消息