Click on a button after 2 seconds

Question

When I click on a button, another button should be clicked programmatically after 2 seconds.

Helper.setTimeout(() -> {
    _view.findViewById(R.id.turbineStandBy).performClick();
}, 2000);

When I run this code, I get this exception:

Only the original thread that created a view hierarchy can touch its views.

public static void setTimeout(Runnable runnable, int delay){
    new Thread(() -> {
        try {
            Thread.sleep(delay);
            runnable.run();
        }
        catch (Exception e){
            System.err.println(e);
        }
    }).start();
}

I think that I have to override the method run() but how can I do that in my setTimeout() method?

@hata `Helper` is the class of my method `setTimeout()`. The code of `setTimeout()` you see in my post. — xRay, Nov 05 '21 at 01:12
It's your original method. So you can redefine it rather than overriding `run()` method. — hata, Nov 05 '21 at 02:38

score 1 · Answer 1 · answered Nov 05 '21 at 02:35

1

Just use post delayed method

button.setOnClickListener(view -> {
      new Handler().postDelayed(new Runnable() {
          @Override
          public void run() {
        //click your button here

          }
      },2000);
  });

answered Nov 05 '21 at 02:35

Manjeet deswal

692
2
5
18

hata · Accepted Answer · 2021-11-05T04:16:05.983

Only the original thread that created a view hierarchy can touch its views.

The exception tells you that you must run the Runnable in the main thread. To do so, you can use Looper.getMainLooper or Activity#runOnUIThread (cf. runOnUiThread vs Looper.getMainLooper().post in Android).

Below codes are structural examples (you might still need to make somewhat modification).

Using Looper.getMainLooper:

public void setTimeout(Runnable runnable, int delay) {
    new Handler(Looper.getMainLooper()).postDelayed(runnable, delay);
}

Using Activity#runOnUIThread:

public void setTimeout(Activity activity, Runnable runnable, int delay) {
    new Thread(() -> {
        try {
            Thread.sleep(delay);
            activity.runOnUIThread(runnable);
        }
        catch (Exception e){
            System.err.println(e);
        }
    }).start();
}

(Note: I don't know whether you should put static modifier to the method or not.)

Apparently, in your case you want to make delay, using Looper.getMainLooper combined with Handler#postDelayed looks smarter.

Click on a button after 2 seconds

2 Answers2