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);
	}
}

So in the baseactivity where are you setting the contentview ? Actullay we need to put the content view in both base and other activities extending it? Can you please explain. Can you please put the code here.
The setcontent in the base activity is coming on the top of the setcontent xml in the extending activity. So how to set both of them.

Hi, I want to include a navigation menu in all of the activities. I used the code "BaseActivity.java" and extended all other activities to BaseActivity. i have an issue, when I try to call one of my activities i get the following runtime exception

Unable to start activity ComponentInfo{lecho.lib.hellocharts.samples.app.wicedsense/lecho.lib.hellocharts.samples.blog_activity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.app.ActionBarDrawerToggle.syncState()' on a null object reference

The following is the code which I modified:

` public class BaseActivity extends AppCompatActivity
{
public DrawerLayout drawerLayout;
public ListView drawerList;
private ActionBarDrawerToggle drawerToggle;
public String[] layers;
private CharSequence mTitle;
private CharSequence mDrawerTitle;

protected void onCreateDrawer(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
mTitle =mDrawerTitle=getTitle();
drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);

    drawerToggle = new ActionBarDrawerToggle((Activity) this, drawerLayout, R.drawable.ic_drawer, 0, 0)
    {
        public void onDrawerClosed(View view)
        {
            getSupportActionBar().setTitle(mTitle);
            invalidateOptionsMenu();
        }

       public void onDrawerOpened(View drawerView)
        {
            getSupportActionBar().setTitle(mDrawerTitle);
            invalidateOptionsMenu();
        }
    };
    drawerLayout.setDrawerListener(drawerToggle);

    getActionBar().setDisplayHomeAsUpEnabled(true);
    getActionBar().setHomeButtonEnabled(true);
    layers = getResources().getStringArray(R.array.nav_drawer_items);
    drawerList = (ListView) findViewById(R.id.list_slidermenu);
    drawerList.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_activated_1,
            android.R.id.text1,layers)); //Items is an ArrayList or array with the items you want to put in the Navigation Drawer.

    drawerList.setOnItemClickListener(new AdapterView.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);
}

}`

I get an exception at this point: drawerLayout.setDrawerListener(drawerToggle);
And i also found out that setting a title was producing an Nullpointer exception getSupportActionBar().setTitle(mTitle); and getSupportActionBar().setTitle(mDrawerTitle);

My question is do I need to hard code the title or is there any other smart way of doing it.

I get an exception at this point: drawerLayout.setDrawerListener(drawerToggle);

Look at line 9: R.id.drawer_layout should be in every activity with exactly the same id. Your drawerLayout equals null at this point.

Thanks , I Needed This

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"