Action bar Back button not working

Question

with the help of these Android Docs.I am trying to do a action bar Back button.I get an Action Bar Back Button like these below image:

Answer 1

Try like

First of all you need to use addToBackStack() before commit() for Fragments

@Override
     public boolean onOptionsItemSelected(MenuItem item) {
         switch (item.getItemId()) {
         // Respond to the action bar's Up/Home button
         case android.R.id.home:
             if(getSupportFragmentManager().getBackStackEntryCount()>0)
                getSupportFragmentManager().popBackStack();
             return true;
         }
         return super.onOptionsItemSelected(item);
     } 

Answer 2

Please read this

you should have something like this:

    <activity
        android:name="com.sit.fth.activity.HomeActivity"
        android:screenOrientation="portrait">

    </activity>
    <activity
        android:name="com.sit.fth.activity.GalleryActivity"
        android:screenOrientation="portrait"
        android:parentActivityName="com.sit.fth.activity.HomeActivity">

    <meta-data
        android:name="android.support.PARENT_ACTIVITY"
        android:value="com.sit.fth.activity.HomeActivity"/>

   </activity>

then calling NavUtils.navigateUpFromSameTask(this) will cause navigating to parent activity (HomeActivity).

Answer 3

In my case I had overridden the onCreateOptionsMenu method and I forgot to call super at the end.

Answer 4

You need to call setDisplayHomeAsUpEnabled(true) method in the onCreate method and override onSupportNavigateUp() and call onBackPressed() in it as below. That's it. done :)

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_help);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}

@Override
public boolean onSupportNavigateUp() {
    onBackPressed();
    return true;
}

Answer 5

Here is one more thing to check for in case the other answers here (or here or here or here) don't work.

I had copied some code from another activity that disabled the menu. Deleting this method (and applying the solutions given in the others answers) allowed the up button to work.

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // hide the menu
    return false;
}

Answer 6

I solved these problem by adding the below coding in GalleryActivity.

ActionBar actionBar;
actionBar=getActionBar();

actionBar.setDisplayHomeAsUpEnabled(true);

@Override
public boolean onOptionsItemSelected(MenuItem item) { 
        switch (item.getItemId()) {
        case android.R.id.home: 
            onBackPressed();
            return true;
        }

    return super.onOptionsItemSelected(item);
}

In MainActivity:

Previously,

public class HomeActivity extends BaseActivity

Then I change into

public class HomeActivity extends FragmentActivity

In GalleryFragment:

I use Intent to pass it to the GalleryActivity.

@Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
        Gallery gallery = (Gallery) arg0.getAdapter().getItem(arg2);

        Intent intent = new Intent(getActivity(), GalleryActivity.class);
        intent.putExtra("position", position);
        intent.putExtra("id", gallery.getGalId());
        intent.putExtra("name", gallery.getAlbumTitle());
        startActivity(intent);

        // mCallback.OnGalItemSelected(gallery.getGalId(),gallery.getAlbumTitle());
    }