I want to have a AbstractMainActivity which creates the Navigation Drawer. In there I should also handle the clicks on the menu items and then call new activities. In those activities, I want to again use the same Navigation Drawer.
I would extend in the Subclasses with the AbstractMainActivity and call the getLayoutResourceID differently from each subclass (as suggested here: android how to create my own Activity and extend it?).
The problem is, that now in the AbstractMainActivity where I want to build the Navigation Drawer, I do not have any access to the navigation drawer layout (xml) element, as I of course want to have a different base layout for the subclasses.
Would I need to "include layout" in all the subclasses layout files? But this does not work, what do I do wrong if I want to use Activities instead of Fragments with the Navigation Drawer?
public abstract class MainActivity extends Activity {
private String[] menuItems;
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main);
setContentView(getLayoutResourceId());
menuItems = getResources().getStringArray(R.array.menu_items);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
// Set the adapter for the list view
mDrawerList.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, menuItems));
// Set the list's click listener
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
}
protected abstract int getLayoutResourceId();
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
private class DrawerItemClickListener implements ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView parent, View view, int position, long id) {
selectItem(position);
}
/** Swaps fragments in the main content view */
private void selectItem(int position) {
//Fragment fragment = new PlanetFragment();
Bundle args = new Bundle();
// args.putInt(PlanetFragment.ARG_PLANET_NUMBER, position);
Intent intent = new Intent(MainActivity.this, ProductListActivity.class);
startActivity(intent);
}
}
public class ProductListActivity extends MainActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.options_menu, menu);
return true;
}
@Override
protected int getLayoutResourceId() {
// TODO Auto-generated method stub
return R.layout.activity_product_list;
}
This is the layout of the product list sub-class (activity_product_list.xml):
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".ProductList" >
<include layout="@layout/activity_main"/>
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" >
</ListView>
This is the layout of the navigation drawer (activity_main.xml):
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:android1="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer_layout"
android:layout_width="300dp"
android:layout_height="500dp" >
<!-- The main content view -->
<FrameLayout
android:id="@+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<!-- The navigation drawer -->
<ListView android:id="@+id/left_drawer"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:choiceMode="singleChoice"
android:divider="@android:color/transparent"
android:dividerHeight="0dp"
android:background="#c3c3c3"/>
But the does not work, but if I do not have it, I get null-pointer exceptions when my subclass calls the onCreate of the abstract class, where I want to build the Navigation Drawer, it does not find the layout-elements to set the lists and layout (R.id.left_drawer or R.id.drawer_layout)!
