Android - Handler - How To Stop The Intent?

Question

I want to stop the delay/intent from processing when the back button is pressed. I've searched some threads but I don't have the same Handler logic, I think. I apologize if it is.

Here is the code I'm working with:

else {

                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {

                        Intent intent = new Intent(MainActivity.this, PollWebView_Gilmore.class);
                        startActivity(intent);
                        finish();

                    }

                }, 10000);

If you don't need a delay just remove the Handler and keep only the intent — Charuක, Mar 04 '17 at 17:46
code is perfect then whats the problem? please explain your problem — Abhishek Singh, Mar 04 '17 at 17:47
@AbhishekSingh - I would like to cancel the delay/intent when the user presses back. — Simone Walter Macatangay, Mar 04 '17 at 18:31
@Charuක - I need the delay to show additional content first. But if the user presses the back button, I wanted the delay/intent to cancel. — Simone Walter Macatangay, Mar 04 '17 at 18:32

zsmb13 · Accepted Answer · 2017-03-04T18:19:05.947

1

You have to save a reference to both the Handler and your Runnable somewhere, and then you can use the removeCallbacks(Runnable) method on the Handler to cancel the pending request.

Example code:

public class MainActivity extends AppCompatActivity {

    private Handler handler = new Handler();

    private Runnable runnable = new Runnable() {
        @Override
        public void run() {
            Intent intent = new Intent(MainActivity.this, MainActivity.class);
            startActivity(intent);
            finish();
        }
    };

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

        Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                handler.postDelayed(runnable, 5000);
            }
        });
    }

    @Override
    public void onBackPressed() {
        super.onBackPressed();
        handler.removeCallbacks(runnable);
    }

}

edited Mar 04 '17 at 18:19

answered Mar 04 '17 at 17:47

zsmb13

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how do I put "handler.removeCallbacks(runnable);" inside onBackPressed()? – Simone Walter Macatangay Mar 04 '17 at 18:13
I've added an example to my answer. – zsmb13 Mar 04 '17 at 18:20
Thank you. I already have a function for "onBackPressed();" should I just add this? – Simone Walter Macatangay Mar 04 '17 at 18:22
thank you. Got it to work. May I have a contact detail from you? I would also like to ask an additional question about Google Maps. – Simone Walter Macatangay Mar 04 '17 at 18:28
I'm sorry, I can't help you with that, but just post your questions here, I'm sure you'll find someone who can. – zsmb13 Mar 04 '17 at 18:32

score 1 · Answer 2 · edited May 23 '17 at 12:17

1

If you Don't need a delay why do you use a Handler? Just remove it!

Call this directly

Intent intent = new Intent(MainActivity.this, PollWebView_Gilmore.class);
startActivity(intent);
finish();

When your back button is pressed!

You can also get an idea by reading below posts.

Android: Proper Way to use onBackPressed() with Toast

How to run a Runnable thread in Android?

edited May 23 '17 at 12:17

Community

1
1

answered Mar 04 '17 at 17:53

how do I put "handler.removeCallbacks(runnable);" inside onBackPressed()? – Simone Walter Macatangay Mar 04 '17 at 18:13

score 0 · Answer 3 · answered Mar 04 '17 at 17:48

0

If you want to do something with the intent on back pressed.You can override onBackPressed() method.

answered Mar 04 '17 at 17:48

Jack

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how do I put "handler.removeCallbacks(runnable);" inside onBackPressed()? – Simone Walter Macatangay Mar 04 '17 at 18:06
@Override public void onBackPressed() { super.onBackPressed(); handler.removeCallbacks(runnable); } – Jack Mar 05 '17 at 07:43

Android - Handler - How To Stop The Intent?

3 Answers3