How to open Side bar on icon click in Android?

Question

I have implemented Hamburger bar with App toolbar and both of them are working fine. Following is the snapshot of toolbar and hamburgerbar:

Hamburger bar

I can open this bar by sliding it but I also want to make it open by clicking on drawable icon (right top corner icon). How can i do that?

MainActivity

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayShowHomeEnabled(true);

    drawerFragment = (FragmentDrawer)
            getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer);
    drawerFragment.setUp(R.id.fragment_navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout), toolbar);
    drawerFragment.setDrawerListener(this);
 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    return super.onOptionsItemSelected(item);
}

I don't think so that I need to do some changes in layout files. What do I have to add in MainActivity file to make it possible?

I am newbie in Android code. Any help will be appreciable.

Answer 1

Use Activity's onOptionsItemSelected(MenuItem menuItem) method:

First of all, keep the reference to your DrawerLayout in a class field:

DrawerLayout drawerLayout;

Somewhere in onCreate put this:

drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout)

And implement the method:

@Override
public boolean onOptionsItemSelected(MenuItem menuItem) {
    // if you want the default back/home hamburger menu item just put android.R.id.home instead
    if (menuItem.getItemId() == R.drawable.icon_navigation) { 
        drawerLayout.openDrawer(GravityCompat.END);
    }
    return super.onOptionsItemSelected(menuItem);
}

Answer 2

Using the Toolbar component should be fairly easy to achieve this by using a similar code to this:

    Toolbar toolbar = (Toolbar) findViewById(R.id.home_toolbar);
    toolbar.inflateMenu(R.menu.menu_home);
    toolbar.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() {
        @Override
        public boolean onMenuItemClick(MenuItem item) {
            if (item.getItemId() == R.id.action_settings) {
                mDrawerLayout.openDrawer(Gravity.RIGHT); // where mDrawerLayout is your android.support.v4.widget.DrawerLayout in your activity's xml layout.
            }
            return false;
        }
    });

EDIT:

The key component here is the menu_home.xml file which goes to your res/menu folder. You can add your desired menu item there, customize it's icon and even more, add as many items as you'd like to have on the right side of the toolbar(Obviously handle the openDrawer() method on whichever menu item you need - the recommended one is the rightmost though).

Answer 3

Use the openDrawer() method.

private DrawerLayout mDrawerLayout;
...
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
...
mDrawerLayout.openDrawer(Gravity.END); // or whatever gravity the of the drawer you want to open