Same Navigation Drawer on different Activities

BaseActivity.java

public class BaseActivity extends AppCompatActivity 
{
	public DrawerLayout drawerLayout;
    public ListView drawerList;
    private ActionBarDrawerToggle drawerToggle;
	
    protected void onCreate(Bundle savedInstanceState)
    {
    	// R.id.drawer_layout should be in every activity with exactly the same id.
    	drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    	
    	drawerToggle = new ActionBarDrawerToggle((Activity) this, drawerLayout, R.drawable.ic_drawer, 0, 0) 
    	{
	        public void onDrawerClosed(View view) 
	        {
	            getActionBar().setTitle(R.string.app_name);
	        }
	
	        public void onDrawerOpened(View drawerView) 
	        {
	            getActionBar().setTitle(R.string.menu);
	        }
	    };
	    drawerLayout.setDrawerListener(drawerToggle);
	
	    getActionBar().setDisplayHomeAsUpEnabled(true);
	    getActionBar().setHomeButtonEnabled(true);
	    
	    drawerList = (ListView) findViewById(R.id.left_drawer);
	    drawerList.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_activated_1,
	            items)); //Items is an ArrayList or array with the items you want to put in the Navigation Drawer.
	
	    drawerList.setOnItemClickListener(new OnItemClickListener() {
	        @Override
	        public void onItemClick(AdapterView<?> arg0, View arg1, int pos, long arg3) {
	            // Do what you want when an item from the Navigation Drawer is clicked
	        }
	    });
    }
    
    @Override
	public boolean onOptionsItemSelected(MenuItem item) {
	
	    if (drawerToggle.onOptionsItemSelected(item)) {
	        return true;
	    }
	    return super.onOptionsItemSelected(item);
	
	}
	
	@Override
	protected void onPostCreate(Bundle savedInstanceState) {
	    super.onPostCreate(savedInstanceState);
	    drawerToggle.syncState();
	}
	
	@Override
	public void onConfigurationChanged(Configuration newConfig) {
	    super.onConfigurationChanged(newConfig);
	    drawerToggle.onConfigurationChanged(newConfig);
	}
}

drawerLayout.setDrawerListener(drawerToggle);
java.lang.NullPointerException

How to color the background of the selected item

I've followed everything what you given but every activity I am getting bellow error don't know why
"android.view.InflateException: Binary XML file line #28: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference"