Issues in implementing GridView within a fragment

Question

I am working on a small application which contains Activity with NavigationDrawer, and i have placed a fragment on that activity using FragmentManager

Answer 1

You're not respecting the Activity lifecycle. When you do this

FragmentManager FM = getFragmentManager();
FragmentTransaction Trans = FM.beginTransaction();

before the method onCreate being called, you don't have the Activity properly created.

Move that code to the onCreate method:

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.navigation_drawer);
    AddApps Aapps = new AddApps();
    drawerlayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    LVdrawer = (ListView) findViewById(R.id.left_drawer);
    LVdrawer.setAdapter(new CustomAdapter(this, 1));

    FragmentManager FM = getFragmentManager();
    FragmentTransaction Trans = FM.beginTransaction();

    Trans.add(R.id.content_frame, Aapps, "AddAppsF");
    Trans.addToBackStack("AddApps");
    Trans.commit();
}