How to Override Action Bar Back Button in Android

how to override action bar back button in android?

I think you want to override the click operation of home button. You can override this functionality like this in your activity.

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case android.R.id.home:
        Toast.makeText(getApplicationContext(),"Back button clicked", Toast.LENGTH_SHORT).show(); 
        break;
    }
    return true;
}

How to implement the Android ActionBar back button?

Selvin already posted the right answer. Here, the solution in pretty code:

public class ServicesViewActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // etc...
        getActionBar().setDisplayHomeAsUpEnabled(true);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case android.R.id.home:
            NavUtils.navigateUpFromSameTask(this);
            return true;
        default:
            return super.onOptionsItemSelected(item);
        }
    }
}

The function NavUtils.navigateUpFromSameTask(this) requires you to define the parent activity in the AndroidManifest.xml file

<activity android:name="com.example.ServicesViewActivity" >
    <meta-data
     android:name="android.support.PARENT_ACTIVITY"
     android:value="com.example.ParentActivity" />
</activity>

See here for further reading.

Android - Remove back button from action bar for a particular fragment

you can hide the button on the wanted fragment like this

@Override
public void onResume() {
    super.onResume();
    ((AppCompatActivity)getActivity()).getSupportActionBar(). setDisplayHomeAsUpEnabled(false);
}

@Override
public void onStop() {
    super.onStop();
    ((AppCompatActivity)getActivity()).getSupportActionBar(). setDisplayHomeAsUpEnabled(true);
}

How to enable back press button on the right side of action bar?

What you did is enabled the action-bar's back functionality on click/touch event. If you want a button at the right of the action bar, the best/easy thing you can do is to add an overflow menu, for which you can set-up any icon you want.

There are lots of tutorials on how to do this (for ex. http://www.techotopia.com/index.php/Creating_and_Managing_Overflow_Menus_on_Android).

Essential points are as follows.

1. Create the layout/items for the overflow menu (filename should match with the one in the 2nd step).

   <menu xmlns:android="http://schemas.android.com/apk/res/android" >  
           <item  
                   android:id="@+id/menu_settings"  
                   android:orderInCategory="1"  
                   android:showAsAction="never"  
                   android:icon="@drawable/overflow_menu_icon"  
                   android:title="@string/menu_settings" />  
   </menu>  
   

2. Init the overflow inside the onCreateOptionsMenu() function, where activity_menu_app is the name of the .xml file created in the previous step.

   @Override
   public boolean onCreateOptionsMenu(Menu menu) {
           getMenuInflater().inflate(R.menu.activity_menu_app, menu);
           return true;
   }
   

3. Catch the touch events of the menu items inside onOptionsItemSelected() function.

   @Override
   public boolean onOptionsItemSelected(MenuItem item) {
           switch (item.getItemId()) {
                   case R.id.menu_settings:
                           // do your stuff here
                           return true;
                   default:
                           return super.onOptionsItemSelected(item);
           }
   }
   

How to display back button on action bar in android another activity

Just add code this in the onCreate method of your [CurrentActivity].java file.

getSupportActionBar().setDisplayHomeAsUpEnabled(true);

And this line of code will just add a back button in your Action Bar, but nothing would happen after tapping that right now.

And add this in your [CurrentActivity].java, this will add the working of that button:

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case android.R.id.home:

            Intent intent = new Intent(CurrentActivity.this, MainActivity.class);
            startActivity(intent);
            finish();
            return true;

        default:
            return super.onOptionsItemSelected(item);
    }
}

And replace CurrentActivity to your activity name and replace MainActivity to the activity you want to send user after pressing back button

Android - How To Override the Back button so it doesn't Finish() my Activity?

Remove your key listener or return true when you have KEY_BACK.

You just need the following to catch the back key (Make sure not to call super in onBackPressed()).

Also, if you plan on having a service run in the background, make sure to look at startForeground() and make sure to have an ongoing notification or else Android will kill your service if it needs to free memory.

@Override
public void onBackPressed() {
   Log.d("CDA", "onBackPressed Called");
   Intent setIntent = new Intent(Intent.ACTION_MAIN);
   setIntent.addCategory(Intent.CATEGORY_HOME);
   setIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
   startActivity(setIntent);
}

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