Handler postDelayed doesn't post on delayed?

Question

I want to change some values onBackPressed method... And i override it like this:

@Override
public void onBackPressed() {

            final Handler backHandler = new Handler();
            backHandler.postDelayed(new Runnable() {
                public void run() {
                    exitCount = 0;
                    Log.d("exitCount", "exitCount: " + exitCount);
                }
            }, Toast.LENGTH_SHORT);

}

But the problem is handler posts immediately... There's no delay. Where am i doing wrong? Sorry if this is a lame question, i'm pretty new on Android. Thanks in advance.

score 2 · Accepted Answer · answered May 04 '12 at 10:35

2

That is because Toast.LENGTH_SHORT value is zero. Try declaring your constant with a delay value you choose. see here

answered May 04 '12 at 10:35

Blackbelt

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But i need it to delay exactly Toast.LENGTH_SHORT do you know how millis that is? – yahya May 04 '12 at 10:39
Found it by trying some :) 2000 millis work just fine :) Thanks a lot. – yahya May 04 '12 at 10:42
2seconds I think. But it could change with the android implemetation – Blackbelt May 04 '12 at 10:43

score 1 · Answer 2 · answered May 04 '12 at 10:40

Make the handler part of an activity (or part of a thread you are posting a message to if its not for the UI thread), and use a millisecond delay rather than Toast.LENGTH_SHORT which has a value of zero so it will happen instantly.

public class SomeActivity extends Activity {
    private Handler mHandler = new Handler();

    @Override
    public void onBackPressed() {
        mHandler.postDelayed(new Runnable() {

            @Override
            public void run() {
                Log.d("tag", "Hello, Handler!");
            }
        }, 1000); // one second
    }
}

score 0 · Answer 3 · answered May 04 '12 at 10:41

Use belo code I hope it will work.

runOnUiThread(new Runnable() {

            @Override
            public void run() {
                backHandler.postDelayed(new Runnable() {
                public void run() {
                    exitCount = 0;
                    Log.d("exitCount", "exitCount: " + exitCount);
                }
            }, Toast.LENGTH_SHORT);
            }
        });

Handler postDelayed doesn't post on delayed?

3 Answers3