Back button -> emulate home button

Question

I want hide my app, if press BACK button.

@Override
public boolean onKeyDown(int keyCode, KeyEvent event)  
{
     if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0)
     {
        this.moveTaskToBack(true);
        return true;
     }
    return super.onKeyDown(keyCode, event);
}

But my app close. What i do wrong?

may be help http://stackoverflow.com/questions/11240183/back-button-works-like-home?rq=1 — Dixit Patel, Jul 17 '13 at 12:56

kord · Accepted Answer · 2013-07-17T13:10:00.000

1

You must override onBackPressed() method of Activity class. Here is a sample of code:

@Override
public void onBackPressed() {
    Intent startMain = new Intent(Intent.ACTION_MAIN);
    startMain.addCategory(Intent.CATEGORY_HOME);
    startMain.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(startMain);
}

Also you must override onBackPressed() method in child activities:

@Override
public void onBackPressed() {
    this.getParent().onBackPressed();   
}

edited Jul 17 '13 at 13:10

answered Jul 17 '13 at 13:00

kord

482
3
12

NO! It's doesn't work for me. – plsgogame Jul 17 '13 at 13:01
may be it's doesn't work, because I use TabActivity? – plsgogame Jul 17 '13 at 13:03
1

You can override onBackPressed() in tab activity. http://stackoverflow.com/questions/2796050/key-events-in-tabactivities – Thalaivar Jul 17 '13 at 13:06
1

TabActivity is deprecated so it's a good idea to implement your application using Fragments – kord Jul 17 '13 at 13:07

score 0 · Answer 2 · answered Jul 17 '13 at 19:46

By keeping activity at back do you mean the back button should act like a home button. If that is so try this,

@Override
public void onBackPressed() {
    Intent backtoHome = new Intent(Intent.ACTION_MAIN);
    backtoHome.addCategory(Intent.CATEGORY_HOME);
    backtoHome.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(backtoHome);
}

Adding this to your Activity, will make it look like your app is responding to a Home Button Click event, and your app will hide but not close.

score -1 · Answer 3 · answered Jul 17 '13 at 13:10

-1

you can try this:

 Intent intent2 = new Intent(getApplicationContext(), MainActivity.class);
        intent2.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        intent2.putExtra("EXIT", true);
        startActivity(intent2);

And into your MainActivity:

Write this in onCreate()

if (getIntent().getBooleanExtra("EXIT", false)) {
            finish();
        }

Try this. It will send you to the HomeScreen.

answered Jul 17 '13 at 13:10

Narendra Pal

6,474
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any comment by the downvoters?? – Narendra Pal Jul 17 '13 at 13:40

Cos · Answer 4 · 2013-07-18T15:42:36.437

-3

I'd recommend you reconsider. If every application were allowed to use the buttons however they wish, it would be impossible to maintain a certain consistency in user experience.

The physical buttons should work the same for all applications.A prof told me once: "Your app is nothing special." Not in the sense that it's not great, just that it should, optimally, follow certain standards so as to not confuse users.

edited Jul 18 '13 at 15:42

answered Jul 17 '13 at 12:54

Cos

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How do you come to this conclusion? – Stephen D Jul 18 '13 at 14:21

Back button -> emulate home button

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