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Question

I am currently learning about the Navigation Drawer from the android site, and I am using their example http://developer.android.com/training/implementing-navigation/nav-drawer.html

What I want is to add a button in the MainActivity which would be able to open the NavigationDrawer . I need to do it programmatically, not in XML. How can I do that?

Answer 1

Create a method in MainActivity which contains your drawerLayout.

public void open()
{
    mDrawerLayout.openDrawer(Gravity.LEFT);
}

and from Your fragment In oncreateView() method As you want new Button Programmatically add Button in Your Root inflated layout. Your fragment has button
bellow I modified fragment try

 public static class PlanetFragment extends Fragment {
    public static final String ARG_PLANET_NUMBER = "planet_number";

    public PlanetFragment() {
        // Empty constructor required for fragment subclasses
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_planet, container, false);
        int i = getArguments().getInt(ARG_PLANET_NUMBER);
        String planet = getResources().getStringArray(R.array.planets_array)[i];

        int imageId = getResources().getIdentifier(planet.toLowerCase(Locale.getDefault()),
                        "drawable", getActivity().getPackageName());
        ((ImageView) rootView.findViewById(R.id.image)).setImageResource(imageId);
        getActivity().setTitle(planet);
        RelativeLayout root=(RelativeLayout)rootView.findViewById(R.id.root);
        Button button=new Button(getActivity());            
        LayoutParams params=new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
        button.setLayoutParams(params);
        params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
        params.addRule(RelativeLayout.ALIGN_PARENT_TOP);
        button.setText("openDrawer");
        root.addView(button);

        button.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                ((MainActivity)getActivity()).open();
            }
        });
        return rootView;
    }
    }
 }

You can try this code in your fragment..

Answer 2

Create your Button in onCreate(Bundle) method:

Button button = new Button(this);

Find your DrawerLayout :

mDrawerLayout = (DrawerLayout) findViewById(R.id.my_drawer_layout_id);

Set an OnClickListener on this button:

button.setOnClickListener(new OnClickListener() {
    public void onClick(View view) {
        mDrawerLayout.openDrawer(Gravity.LEFT);   
    }
)

This will give you an empty drawer. If you have a View that you would like to place inside the drawer, replace:

mDrawerLayout.openDrawer(Gravity.LEFT);

with:

mDrawerLayout.openDrawer(myCustomView);

If you want the button to toggle the drawer(close the drawer if its open or, open it if its closed) use the following OnClickListener :

button.setOnClickListener(new OnClickListener() {
    public void onClick(View view) {
        if (mDrawerLayout.isDrawerOpen(Gravity.LEFT)) {
            mDrawerLayout.closeDrawer(Gravity.LEFT);
        } else {
            mDrawerLayout.openDrawer(Gravity.LEFT); 
        }  
    }
)

If you are using a custom view, use this OnClickListener :

button.setOnClickListener(new OnClickListener() {
    public void onClick(View view) {
        if (mDrawerLayout.isDrawerOpen(myCustomView)) {
            mDrawerLayout.closeDrawer(myCustomView);
        } else {
            mDrawerLayout.openDrawer(myCustomView); 
        }  
    }
)