Android activity closing entire app on back button press

Question

I have a main activity in my app. This activity creates two other activities (at different times). One is a settings activity and the other is a custom activity.

Now my problem is when i am in the settings activity and i press the back button, it returns to the main activity. Great just like it should. But now when i am in my custom activity and i press the back button the entire app closes?? It does not return to the main activity like it should.

I am not sure why this is, as the way i instantiate the two classes is the same and the manifest file is the same for both activities.

Code to call the activities:

Intent intent = new Intent(this, SettingsActivity.class);
startActivity(intent);

and

Intent intent = new Intent(this, PacketActivity.class);
startActivity(intent);

Manifest file:

<activity
    android:name="com.example.tcptester.SettingsActivity"
    android:label="@string/title_activity_settings" >
</activity>
<activity
    android:name="com.example.tcptester.PacketActivity"
    android:label="@string/title_activity_packet">
</activity>

Why could this be so?

Answer 1

I found the problem,

Thought i would post the answer for any one else who maybe have the same problem,

The problem was in my switch statement: I left out a return true.

    switch (item.getItemId()) {
    case R.id.menu_packet: {
        Intent intent = new Intent(this, PacketActivity.class);
        startActivity(intent);
        /*-->>>>> i did not have this here:*/ return true;
    }
    case R.id.menu_settings: {
        Log.i("Menu Item Clicked", "Settings");
        Intent intent = new Intent(this, SettingsActivity.class);
        startActivity(intent);
        return true;
    }       
    default: {
        return super.onOptionsItemSelected(item);
    }
    }