change button image onClick android

Question

I have a button and two images, i want the default image for the button to be btn1.jpg and when the button is clicked, the image should immediately change to btn2.jpg and after 3 seconds, it should again revert back to btn1.jpg. please tell me how do i achieve this?

    package com.example.btn;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends Activity {

    private View ButtonName;

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

    public void yolo(View v) {
        switch (v.getId()) {
            case R.id.buttonName:
                ButtonName.setBackgroundResource(R.drawable.btn2);
                //Disable click on Button
               ButtonName.setEnabled(false);
               try {
                   Thread.sleep(3000);
               }
               catch (Exception e) {
                  e.printStackTrace();
               }
               ButtonName.setBackground(getResources().getDrawable(R.drawable.btn1));
               break;

            case default:
                ButtonName.setBackgroundResource(R.drawable.btn1);
        }
    }

}

Answer 1

You must change the button background image in the OnClick method to btn2.jpg. After that, you must start a timer to count down 3 seconds and, after that, change again the button image to btn1.jpg

private final int interval = 3000;
private Handler handler = new Handler();
private Runnable runnable

btn.setOnClickListener(new View.OnClickListener()
{
    @Override
    public void onClick(View v)
    {

        btn.setBackground(getResources().getDrawable(R.drawable.btn2))

        //Start runnable after 3 seconds
        handler.postDelayed(runnable, interval);

    }
});

runnable = new Runnable(){
    public void run() {
       btn.setBackground(getResources().getDrawable(R.drawable.btn1)) 
    }
};