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new Handler().postDelayed(() -> { picture.browsePictureFolder(); }, 30000);
new Handler().postDelayed(new Runnable() { @Override public void run() { MainActivity.this.finish(); } }, 1800);
Android 11
new Handler(Looper.getMainLooper()).postDelayed(new Runnable() { public void run() { progressBar.setVisibility(View.INVISIBLE); } }, 3000);