Android lollipop toolbar switch between open/close drawer and back button

Question

I had standart navigation drawer, but now i'm trying to modify it, using toolbar. Earlier my code looked like: MainActivity.java ``` @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Log.v("MAIN", "CREATE"); initViews(); setListeners(); getFragmentManager().addOnBackStackChangedListener(new FragmentManager.OnBackStackChangedListener() { @Override public void onBackStackChanged() { shouldDisplayHomeUp(); } }); mNavigationDrawerFragment = (NavigationDrawerFragment) getFragmentManager().findFragmentById(R.id.navigation_drawer); mTitle = getTitle(); // Set up the drawer. mNavigationDrawerFragment.setUp( R.id.navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout)); } ``` NavigationDrawerFragment.java ``` public void setUp(int fragmentId, DrawerLayout drawerLayout) { mFragmentContainerView = getActivity().findViewById(fragmentId); mDrawerLayout = drawerLayout; mDrawerLayout.setDrawerShadow(R…

Accepted Answer

From the docs:

To allow Up navigation with the app icon in the action bar, call setDisplayHomeAsUpEnabled():

```
@Override public void onCreate(Bundle savedInstanceState) {
     ...
     getActionBar().setDisplayHomeAsUpEnabled(true); }
```

This adds a left-facing caret alongside the app icon and enables it as an action button such that when the user presses it, your activity receives a call to onOptionsItemSelected(). The ID for the action is android.R.id.home.

This means that you will have to implement your back routine on `onOptionsItemSelected` and check for `R.id.home`. To avoid calling the routine when you click on the hamburger menu check for `canback` too on `onOptionsItemSelected`.

http://developer.android.com/training/implementing-navigation/ancestral.html#up

EDIT

To archieve what you want you will have to implement your own navigation routine.

```
    mToolbar.setNavigationOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if(shouldBack()) {
               //call onbackpressed or something
                if(displayBackAgain)
                    return; //return after so you don't call syncState();       
            }else if (mNavigationDrawerFragment.isDrawerOpen())
                mNavigationDrawerFragment.closeDrawer();
            else
                mNavigationDrawerFragment.openDrawer();
            mNavigationDrawerFragment.getActionBarDrawerToggle().syncState();
        }
    });
}
```

To enable the backbutton icon just call `getSupportActionBar().setDisplayHomeAsUpEnabled(true);` to disable it just call `mNavigationDrawerFragment.getActionBarDrawerToggle().syncState();`

Android lollipop toolbar switch between open/close drawer and back button

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