Click on a button after 2 seconds-CodePudding

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?

CodePudding user response：

Just use post delayed method

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

          }
      },2000);
  });

CodePudding user response：

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.