Android：在处理程序中更新当前活动UI

当处理程序调用其他类时，我很难在活动中更新UI。下面是我创建的代码

活动A

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_A);

    Handler handler = new Handler(); //Here is where the handler is start, other class will update the Handler message.
    ......
}

活动B

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_B);

    ......
}

//Just a dummy function called when handler is triggered
private void onChange(){
    TextView tv_status = findViewById(R.id.status);
    tv_status.setText("Complete");
}

类处理程序

public Handler {

    public Handler(){
         Handler handler = new Handler(){
               public void HandleMessage(Message msg){
                    switch (msg.what) {
                        case 1:
                             break;
                        case 2:
                             //should trigger to update the TextView in Activity B here
                             break;
                   }
              }
        };

        .......

    }
}

活动A作为主处理程序，在这里调用处理程序来启动处理程序，活动B只是更新处理程序触发的UI。

希望这会有所帮助

public Handler {

    public Handler(){
         Handler handler = new Handler(){
               public void HandleMessage(Message msg){
                    switch (msg.what) {
                        case 1:
                             break;
                        case 2:
                             //should trigger to update the TextView in Activity A here 
                            runOnUiThread(new Runnable() {
                             @Override
                               public void run() {
                                 // Update your view
                               }
                              });
                             break;
                   }
              }
        };

        .......

    }
}

---

您的活动如何知道处理程序存在？您在哪里创建处理程序？要更新处理程序中的任何视图，您需要更新Main Thread.cricket_007中的视图。我的坏事业没有显示出完整的步骤。我会更新我的问题。对不起，兄弟，误解了，作为一个，你需要确保你在UI线程第一希望这个链接可以帮助你-