Question

On Android Developer Site has said that : We shouldn’t use long operations work in UIThread. Instead, we should do it on another thread. At this site, they still say :

if the UI thread is blocked for more than a few seconds (about 5
seconds currently) the user is presented with the infamous
“application not responding” (ANR) dialog.

To test this statement, I make a proof. Here is my code:

package com.app;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class Example extends Activity{
    TextView  textView;
    @Override 
    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        textView = new TextView(this);
        textView.setText("please wait");
        setContentView(textView);

    }

    @Override
    public void onResume(){
        super.onResume();
        try {
            Thread.sleep(8000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        textView.setText("end waiting !!!");
    }

}

As you see, I make current thread (UIThread) sleep 8 seconds. So, I think, if I run this apps, Android will notice: “application not responding”. But, I don’t see any error. Program run smoothly (and I see text “end waiting”, too).

So,who can explain for me about my code. What wrong thing I have made,please.

thanks 🙂

Answer 1

@hqt in your sub-question (sorry that I cannot post comment), If you want your program terminate, after you click your button, when your button in 8-seconds-running, you should click again your button, and the “magic” will happened as you wish 🙂