Clicking hamburger icon on Toolbar does not open Navigation Drawer

Question

I have a simple android.support.v7.widget.Toolbar and all I am trying to do is to open a NavigationDrawer by pressing the \"hamburger\" icon in the top left cor

Answer 1

Use ActionBarDrawerToggle and implement public boolean onOptionsItemSelected(MenuItem item)

Toolbar DOES NOT have to be within a DrawerLayout, it's not likely to be the cause of this issue. toggle.onOptionsItemSelected(item) looks for the ID of the item selected and if it is android.R.id.home then the drawer's visibility is toggled. Thus Toolbar, or any View that creates a Home MenuItem, can be placed anywhere in your layout.

Within your activity:

ActionBarDrawerToggle toggle;

private void setupDrawerToggleInActionBar() {
    // assuming a Toolbar has been initialized in your onCreate
    this.setSupportActionBar(toolbar);

    // setup the action bar properties that give us a hamburger menu
    ActionBar actionBar = this.getSupportActionBar();
    if(actionBar != null) {
        actionBar.setDisplayHomeAsUpEnabled(true);
        actionBar.setHomeButtonEnabled(true);
    }

    // the toggle allows for the simplest of open/close handling
    toggle = new ActionBarDrawerToggle(this,
                                       drawerLayout,
                                       R.string.navigation_drawer_open,
                                       R.string.navigation_drawer_close);
    // drawerListener must be set before syncState is called
    drawerLayout.setDrawerListener(toggle);

    toggle.setDrawerIndicatorEnabled(true);
    toggle.syncState();
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    // This is required to make the drawer toggle work
    if(toggle.onOptionsItemSelected(item)) {
        return true;
    }

    /*
     * if you have other menu items in your activity/toolbar 
     * handle them here and return true
     */

    return super.onOptionsItemSelected(item);
}