Android onBackPressed() not working

Question

I'm trying to add this function:

-When clicking on Return button it pops an exit prompts (AlertDialog with yes or no)

Problem

But its not working properly. If I click on the button, it exits the program directly.

Here is my whole Activity Code :(The exit function that I have tested is at the end of the code)

@SuppressWarnings("deprecation")
public class MainScreen extends TabActivity {
    // TabSpec Names
    private static final String Alerts_SPEC = "Alertes";
    private static final String Status_SPEC = "Status";
    private static final String Details_SPEC = "Events";

    @SuppressWarnings("deprecation")
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_screen);

        TabHost tabHost = getTabHost();

        // Inbox Tab
        TabSpec alertsSpec = tabHost.newTabSpec(Alerts_SPEC);
        alertsSpec.setIndicator(Alerts_SPEC);
        Intent alertsIntent = new Intent(this, FragmentAlerts.class);
        alertsSpec.setContent(alertsIntent);

        // Outbox Tab
        TabSpec statusSpec = tabHost.newTabSpec(Status_SPEC);
        statusSpec.setIndicator(Status_SPEC);
        Intent statusIntent = new Intent(this, FragmentStatus.class);
        statusSpec.setContent(statusIntent);

        // Profile Tab
        TabSpec detailsSpec = tabHost.newTabSpec(Details_SPEC);
        detailsSpec.setIndicator(Details_SPEC);
        Intent detailsIntent = new Intent(this, FragmentEvents.class);
        detailsSpec.setContent(detailsIntent);


        // Adding all TabSpec to TabHost
        tabHost.addTab(alertsSpec); // Adding Inbox tab
        tabHost.addTab(statusSpec); // Adding Outbox tab
        tabHost.addTab(detailsSpec); // Adding Profile tab


    }

    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.activity_main_actions, menu);

        return super.onCreateOptionsMenu(menu);
    }

    /**
     * On selecting action bar icons
     * */
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Take appropriate action for each action item click
        switch (item.getItemId()) {
        case R.id.action_refresh:
            // refresh
            finish();
            startActivity(getIntent());
            return true;
        case R.id.action_password:
            // help action
            Intent i = new Intent(getApplicationContext(), LoginActivityAdmin.class);
            startActivity(i);
            finish();
            return true;
        default:
            return super.onOptionsItemSelected(item);
        }
    }
// -------------- EXIT CODE BEGINS ------------------------------

    @Override 
    public boolean onKeyDown(int keyCode, KeyEvent event){ 

        if ((keyCode == KeyEvent.KEYCODE_BACK)) { //stop your music here
             // To exit application
            onBackPressed2();
        } 
        return super.onKeyDown(keyCode, event); 
    }

    public void onBackPressed2() {

        new AlertDialog.Builder(this)
               .setMessage("Are you sure you want to exit?")
               .setCancelable(false)
               .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int id) {
                        MainScreen.this.finish();
                   }
               })
               .setNegativeButton("No", null)
               .show();

    }

}

SOLTUION :

I added this code to each child :

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

and then called this in my main activity :

    @Override 
  public void onBackPressed() {

        new AlertDialog.Builder(this)
               .setMessage("Are you sure you want to exit?")
               .setCancelable(false)
               .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int id) {
                       MainScreen.this.finish();
                   }
               })
               .setNegativeButton("No", null)
               .show();

    }

i could name it whatever but even with onBackPressed and with @override nothing happens — Kinn, Jun 05 '14 at 08:48

score 1 · Accepted Answer · edited May 23 '17 at 11:59

1

Try something from this link:

Key Events in TabActivities?

Each tab's Activity handled the "back" presses.

edited May 23 '17 at 11:59

Community

1
1

answered Jun 05 '14 at 09:02

Zoran

1,484
1
10
13

THANK YOU ,you are a life save =) – Kinn Jun 05 '14 at 09:05
Will there be maybe some Solved mark on my answer? :) – Zoran Jun 05 '14 at 09:09
1

done =) by the way i found the solution on the link so delete super.onBackPressed(); – Kinn Jun 05 '14 at 09:11

EpicPandaForce · Answer 2 · 2014-06-05T08:51:47.807

0

My previous answer was wrong, try this:

 /* you don't need this
 @Override 
public boolean onKeyDown(int keyCode, KeyEvent event){ 

    if ((keyCode == KeyEvent.KEYCODE_BACK)) { //stop your music here
         // To exit application
        onBackPressed();
    } 
    return super.onKeyDown(keyCode, event); 
} */

@Override
public void onBackPressed() {

    new AlertDialog.Builder(this)
           .setMessage("Are you sure you want to exit?")
           .setCancelable(false)
           .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
               public void onClick(DialogInterface dialog, int id) {
                   onBackPressed2();
               }
           })
           .setNegativeButton("No", null)
           .show();

}

public void onBackPressed2()
{
    MainScreen.this.finish();
}

}

Or do the following:

@Override 
public boolean onKeyDown(int keyCode, KeyEvent event){ 

    if ((keyCode == KeyEvent.KEYCODE_BACK)) { //stop your music here
         // To exit application
        onBackPressed2();
        return true;
    } 
    else
    {
        return super.onKeyDown(keyCode, event); 
    }
}

edited Jun 05 '14 at 08:51

answered Jun 05 '14 at 08:46

EpicPandaForce

79,669
27
256
428

i just tested this , nothing changed – Kinn Jun 05 '14 at 08:48
Oh, I think I misunderstood your question at first. I'll fix my answer. – EpicPandaForce Jun 05 '14 at 08:49
Thanks , but still nothing happens ,i'm wroking with 4.1.2 platform API 19 – Kinn Jun 05 '14 at 08:55
When happens nothing, do you get alert dialog? Or nothing happens when you click yes? – Zoran Jun 05 '14 at 08:58
Tested the second one ,still no ,I DONT UNDERSTAND WHY ITS NOT WORKING , ITS SO LOGIC TRUE – Kinn Jun 05 '14 at 08:59
That is really strange. Look into http://stackoverflow.com/questions/2459848/android-prompt-user-to-save-changes-when-back-button-is-pressed , and also I think maybe you should try intercepting the onKeyUp function as well. – EpicPandaForce Jun 05 '14 at 09:03
Apparently not. Well, that's new :) – EpicPandaForce Jun 05 '14 at 09:13

score 0 · Answer 3 · answered Jun 05 '14 at 08:54

0

Do not call super.onKeyDown(keyCode, event); when you handle the key event.

@Override 
public boolean onKeyDown(int keyCode, KeyEvent event){ 

    if ((keyCode == KeyEvent.KEYCODE_BACK)) { //stop your music here
         // To exit application
        onBackPressed2();
        return true; 
    } 
    return super.onKeyDown(keyCode, event); 
}

answered Jun 05 '14 at 08:54

mach

8,315
3
33
51

Deleted that and teste pure OnBackPressed() , still nothing – Kinn Jun 05 '14 at 08:56

score 0 · Answer 4 · answered Jun 05 '14 at 09:00

0

you need to put onBackPressed() method inside FragmentAlerts.class. MainActivity is extends by TabActivity so default call gets to your first tab. so call your onbacpress indside first activity i.e FragmentAlerts.

answered Jun 05 '14 at 09:00

chet's

193
2
8

solved by adding OnBackPressed() in each Fragment function for me – Kinn Jun 05 '14 at 09:08
good. TabActivity represent declaration of Tabs only if you want to perform any key events then implement it inside that particular Activity. – chet's Jun 05 '14 at 09:19

Android onBackPressed() not working

4 Answers4

Linked