Develop Reference

toolbar inflate from fragment not working at first drawer layout creation of the activity

Introduction
I have an activity (let's call BaseActivity) that initializes the drawer layout in onPostCreate
public void initDrawerLayout(){
setSupportActionBar(getYellowToolbar());
getSupportActionBar().setDisplayShowTitleEnabled(false);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerLayout.setScrimColor(getResources().getColor(R.color.blue_menu));
// Toggle
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
getYellowToolbar(), R.string.drawer_open, R.string.drawer_close) {
public void onDrawerClosed(View view) {
super.onDrawerClosed(view);
}
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
EventBus.getDefault().post(new UiHelper());
}
};
mDrawerLayout.addDrawerListener(mDrawerToggle);
findViewById(R.id.menu_back).setOnClickListener(new
View.OnClickListener() {
#Override
public void onClick(View view) {
mDrawerLayout.closeDrawer(Gravity.LEFT);
}
});
mExpandableListView = (ExpandableListView) findViewById(R.id.listmenu);
mExpandableListView.setOnGroupClickListener(this);
mExpandableMenuAdapter = getMenuAdapter();
mExpandableListView.setAdapter(mExpandableMenuAdapter);
mDrawerToggle.syncState();
}
Then I have a specific fragment working under an Activity which extends BaseActity.
This fragment adds to the top toolbar (yellowtoolbar) at onResume time an additional button inside R.menu.scanner_menu.
Toolbar toolbar = getYellowToolbar();
if (toolbar == null)
return;
toolbar.getMenu().clear();
toolbar.inflateMenu(R.menu.scanner_menu);
/**
* Add click listener on scan
*/
toolbar.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() {
#Override
public boolean onMenuItemClick(MenuItem item) {
.
.
return false;
}
});
Situation
BaseActivity onPostCreate init drawer layout
ChildrenActivity extends BaseActivity
Fragment inflates new button onResume
Problem
When I reach this fragment from another fragment belonging to the same activity the inflate of the additional button is successful and I can click it with no problem.
While if I starts the application (so the onPostCreate of the BaseActivity is called) having the fragment to be shown at first so both the initDrawerLayout from BaseActivity and the inflate of the fragment are called almost at the same time the inflate of the additional button is unsuccessful and I cannot see it.
Additional info
I have tried to add a generic button in the fragment and clicking on it inflates one more time the menu button in the top toolbar and it correctly works. I think the problem seems to be the toolbar rendering by the drawer layout initialization that is still not completed the moment the fragment inflates the new button, so the toolbar just skip the new button and goes on with the BaseActivity.

Prevent NavigationDrawer from opening on Home Button Click

I have a NavigationDrawer for my main activity, in one instance I show a fragment and the "Hamburger menu" changes into an arrow.
I disabled the ability to open the drawer via swipe when that fragment is shown by using this
mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
and it works fine but now the problem is the user can still open the drawer by clicking the home button "Arrow". I want the arrow to act as the back button and not open the drawer so how can I stop the drawer from opening?

I guess you need to use setNavigationOnClickListener() on toolbar to override drawer behavior.
Like -
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
// logic to decide if drawer open/close, or pop fragment etc
}
});
This does prevents drawer from opening by clicking on icon. But it does open by swiping. But that you already taken care of. So this should work.
Note This works only after you set ActionBarDrawerToggle by calling
mDrawerToggle = new ActionBarDrawerToggle(getActivity(), mDrawerLayout, toolbar, R.string.openDrawer, R.string.closeDrawer){ ...

Put this on your Activity:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getId() == android.R.id.home){
doSomething(); //can be a finish()
}
}
Or, from this answer
mDrawerToggle.setToolbarNavigationClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
popStackIfNeeded();
mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
mActionBar.setDisplayHomeAsUpEnabled(false);
mDrawerToggle.setDrawerIndicatorEnabled(true);
}
});

You could try overriding onOptionsItemSelected check for the id android.R.id.home and call finish() to go back to your previous activity.

try to override on options item select.
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home :
// do what you want
return true;
}
return true;
}

Back navigation with Fragments / Toolbar

I'm scratching my head with this one now.... I have an ActionBarActivity that loads an initial Fragment - the original menu is inflated within the activity. Now, I have a navigation bar that, when an item is selected, loads a different fragment and adds this to the backstack.
When I do this, there are a couple of things I want to set:
Set the home as up indicator
Invalidate the options menu from the main activity
Set has options to true for the Fragment
Ensure that the up indicator correctly navigates back to the original Fragment
Something rather strange is going on - the up indicator appears once only and does not behave as the back button and although I've invalidated and inflated a new menu, the new menu gets appended to the original Activity menu.
EDIT: Ok I've resolved the appending issue - forgot to add menu.clear() in the onCreateOptionsMenu method.
My navigation drawer layout has onClick methods to all menu items which would trigger the load of another Fragment:
public void navItemClick(View view) {
switch (view.getId()) {
case R.id.ripSMS:
mNavigationDrawer.toggleHome(false);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
FragmentTransaction mTrans = getSupportFragmentManager().beginTransaction();
mTrans.replace(R.id.voiceover_frame_layout,new MessageFragment(),"main_ui")
.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE).addToBackStack("msg").commit();
break;
case R.id.ripEmail:
break;
case R.id.ripSettings:
break;
}
mNavigationDrawer.closeDrawer();
}
toggleHome:
public void toggleHome(boolean show) {
mDrawerToggle.setDrawerIndicatorEnabled(show);
if (!show) {
mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
} else {
mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
}
}
Once the item is triggered the onCreate contains the invalidate and the hasOptions code:
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getActivity().invalidateOptionsMenu();
setHasOptionsMenu(true);
}
The onCreateOptionsMenu then inflates another menu layout (contains a single item called settings).
As mentioned, this only partially works once - the first time I use the item to load the Fragment, I get the back icon but it's also not working (this is set within onOptionsItemSelected to check for the home item press - it does nothing). When I press the back button it takes me back to the correct place. If I navigate back however, the back arrow now longer shows even though the code runs through onCreate!

Ok so I managed to solve this after some trial and error. Two changes made:
Implement addOnBackStackChangedListener
ActionBarDrawerToggle's setToolbarNavigationClickListener needed to be set
As I only have one activity (everything else is Fragment classes) I added the backstack listener to the Parent Activity's onCreate method:
getSupportFragmentManager().addOnBackStackChangedListener(new FragmentManager.OnBackStackChangedListener() {
#Override
public void onBackStackChanged() {
if (getSupportFragmentManager().getBackStackEntryCount() > 0) {
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
} else {
getSupportActionBar().setDisplayHomeAsUpEnabled(false);
}
}
});
This resolved the disappearing back arrow when going back to the fragment. Finally added the listener to my NavigationDrawer's setup class:
mDrawerToggle.setToolbarNavigationClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
getActivity().onBackPressed();
}
});
I suppose the only questions I have is everything pointed towards using the onOptionsItemSelected method with android.R.id.home but this never worked for me. It might be the way I've implemented things of course but if someone sees anything obvious as to why please do let me know!

These steps helps you to show back button in toolbar when a fragment is loaded. And to pop out when its clicked.
Set setNavigationOnClickListener to toolbar in you activity.
final DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(getSupportFragmentManager().getBackStackEntryCount() > 0){
getSupportFragmentManager().popBackStack();
}else {
drawer.openDrawer(GravityCompat.START);
}
}
});
Implement FragmentManager.OnBackStackChangedListener in you Activity. And register it with SupportFragmentManager in OnCreate()
getSupportFragmentManager().addOnBackStackChangedListener(this);
OnBackStackChangedListener Implementation method:
#Override
public void onBackStackChanged() {
if(getSupportFragmentManager().getBackStackEntryCount() > 0){
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}else {
getSupportActionBar().setDisplayHomeAsUpEnabled(false);
toggle.syncState();
}
}

For me the above answer was not enough, but i've used #Hamz4h_ and added some more after digging into the ActionBarDrawerToggle class. I'm just calling this method of mine from the activity's onCreate:
private void initNavigationElements() {
final ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, mBinding.drawerLayout, mBinding.appBarMain.toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
mBinding.drawerLayout.addDrawerListener(toggle);
// Tricking the toggle by giving it its own arrow as a custom indicator.
// It will use it when setDrawerIndicatorEnabled is called with false
toggle.setHomeAsUpIndicator(toggle.getDrawerArrowDrawable());
toggle.syncState();
getSupportFragmentManager().addOnBackStackChangedListener(new FragmentManager.OnBackStackChangedListener() {
#Override
public void onBackStackChanged() {
DrawerArrowDrawable drawerArrowDrawable = toggle.getDrawerArrowDrawable();
if (getSupportFragmentManager().getBackStackEntryCount() > 0) {
// 1 - Display as arrow
drawerArrowDrawable.setProgress(1);
toggle.setDrawerIndicatorEnabled(false);
} else {
// 2 - Display as arrow menu
drawerArrowDrawable.setProgress(0);
toggle.setDrawerIndicatorEnabled(true);
}
}
});
toggle.setToolbarNavigationClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// This is called only when setDrawerIndicatorEnabled is set as false, meaning we are not at the "root" fragment.
getSupportFragmentManager().popBackStackImmediate();
}
});
}
Hope this will help someone :)

Drawer Indicator does not show

I can't have the Drawer Indicator display. Currently I have either nothing or the "<" at the top left corner of the screen depending of the actionBar settings. But I want the Drawer Indicator of the Nagivation Drawer instead.
I use :
v4.widget.DrawerLayout
v7.app.ActionBarDrawerToggle
but android.app.ActionBar (not the support 7 one).
Here is snippet of the code :
#Override
protected void onCreate(Bundle savedInstanceState)
{
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setHomeButtonEnabled(true);
actionBar.setDisplayShowHomeEnabled(true);
//I tried all combinations unsuccessfully
....
drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawerLV = (ListView) findViewById(R.id.left_drawer);
drawer_Linearlayout = (LinearLayout) findViewById(R.id.drawer_Linearlayout);
drawerLV.setAdapter(new ArrayAdapter<String>(
this,
R.layout.layout_main_drawer_list_item,
mDrawerItems));
drawerLV.setOnItemClickListener(new ListView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
selectItem(position);
}
});
drawerToggle = new ActionBarDrawerToggle(this, drawer, R.string.drawer_open,R.string.drawer_close) {
#Override
public void onDrawerClosed(View view) {
actionBar.setTitle(mTitle);
}
#Override
public void onDrawerOpened(View drawerView) {
actionBar.setTitle(mDrawerTitle);
}
};
drawerToggle.setDrawerIndicatorEnabled(true);
drawer.setDrawerListener(drawerToggle);
}

I eventually fixed my problem.
I forgot to add the following callback in my Acticity :
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
drawerToggle.syncState();
}
By the way, Lollipop upgrade of v7.app.ActionBarDrawerToggle adds a nice effect when the navigation drawer is opening or closing. I recommend it.

I think you also must specify android.R.id.home it in the onOptionsItemSelected to make the back button visible :
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
//the onClick for your back button
return true;
default:
return super.onOptionsItemSelected(item);
}
}
And you just need to use actionBar.setDisplayHomeAsUpEnabled(true);
UPDATE :
Just did a quick googling, take a look at this :
Display back button on action bar
Try my answer. I think it will solve your problem.

Sorry for my previous answer, I misread it. Think this is what you need:
mDrawerToggle = new ActionBarDrawerToggle(
this,
mDrawerLayout,
R.drawable.ic_drawer, /* The image drawable you're missing */
R.string.navigation_drawer_open,
R.string.navigation_drawer_close
The image is custom, also known as the hamburger.

Switching between Android Navigation Drawer image and Up caret when using fragments

When using the Navigation Drawer the Android devs are recommending that in the ActionBar "only those screens that are represented in the Navigation Drawer should actually have the Navigation Drawer image" and that "all other screens have the traditional up carat."
See here for details: http://youtu.be/F5COhlbpIbY
I'm using one activity to control multiple levels of fragments and can get the Navigation Drawer image to display and function at all levels.
When creating lower level fragments I can call the ActionBarDrawerToggle setDrawerIndicatorEnabled(false) to hide the Navigation Drawer image and have the Up caret displayed
LowerLevelFragment lowFrag = new LowerLevelFragment();
//disable the toggle menu and show up carat
theDrawerToggle.setDrawerIndicatorEnabled(false);
getSupportFragmentManager().beginTransaction().replace(R.id.frag_layout,
lowFrag, "lowerFrag").addToBackStack(null).commit();
The problem I'm having is when I navigate back to the top level fragments the Up carat still shows instead of the original Navigation Drawer image. Any suggestions on how to "refresh" the ActionBar on the top level fragments to re-display the Navigation Drawer image?
Solution
Tom's suggestion worked for me. Here’s what I did:
MainActivity
This activity controls all fragments in the app.
When preparing new fragments to replace others, I set the DrawerToggle setDrawerIndicatorEnabled(false) like this:
LowerLevelFragment lowFrag = new LowerLevelFragment();
//disable the toggle menu and show up carat
theDrawerToggle.setDrawerIndicatorEnabled(false);
getSupportFragmentManager().beginTransaction().replace(R.id.frag_layout,
lowFrag).addToBackStack(null).commit();
Next, in an override of onBackPressed, I reverted the above by setting the DrawerToggle to setDrawerIndicatorEnabled(true) like this:
#Override
public void onBackPressed() {
super.onBackPressed();
// turn on the Navigation Drawer image;
// this is called in the LowerLevelFragments
setDrawerIndicatorEnabled(true)
}
In the LowerLevelFragments
In the fragments I modified onCreate and onOptionsItemSelected like this:
In onCreate added setHasOptionsMenu(true) to enable configuring the options menu. Also set setDisplayHomeAsUpEnabled(true) to enable the < in the actionbar:
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// needed to indicate that the fragment would
// like to add items to the Options Menu
setHasOptionsMenu(true);
// update the actionbar to show the up carat/affordance
getActivity().getActionBar().setDisplayHomeAsUpEnabled(true);
}
Then in onOptionsItemSelected whenever the < is pressed it calls the onBackPressed() from the activity to move up one level in the hierarchy and display the Navigation Drawer Image:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Get item selected and deal with it
switch (item.getItemId()) {
case android.R.id.home:
//called when the up affordance/carat in actionbar is pressed
getActivity().onBackPressed();
return true;
…
}

It's easy as 1-2-3.
If you want to achieve:
1) Drawer Indicator - when no fragments are in the Back Stack or the Drawer is opened
2) Arrow - when some Fragments are in the Back Stack
private FragmentManager.OnBackStackChangedListener
mOnBackStackChangedListener = new FragmentManager.OnBackStackChangedListener() {
#Override
public void onBackStackChanged() {
syncActionBarArrowState();
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(
this,
mDrawerLayout,
R.drawable.ic_navigation_drawer,
0,
0
) {
public void onDrawerClosed(View view) {
syncActionBarArrowState();
}
public void onDrawerOpened(View drawerView) {
mDrawerToggle.setDrawerIndicatorEnabled(true);
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
getSupportFragmentManager().addOnBackStackChangedListener(mOnBackStackChangedListener);
}
#Override
protected void onDestroy() {
getSupportFragmentManager().removeOnBackStackChangedListener(mOnBackStackChangedListener);
super.onDestroy();
}
private void syncActionBarArrowState() {
int backStackEntryCount =
getSupportFragmentManager().getBackStackEntryCount();
mDrawerToggle.setDrawerIndicatorEnabled(backStackEntryCount == 0);
}
3) Both indicators to act according to their shape
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (mDrawerToggle.isDrawerIndicatorEnabled() &&
mDrawerToggle.onOptionsItemSelected(item)) {
return true;
} else if (item.getItemId() == android.R.id.home &&
getSupportFragmentManager().popBackStackImmediate()) {
return true;
} else {
return super.onOptionsItemSelected(item);
}
}
P.S. See Creating a Navigation Drawer on Android Developers on other tips about the 3-lines indicator behavior.

You have written that, to implement lower-level fragments, you are replacing the existing fragment, as opposed to implementing the lower-level fragment in a new activity.
I would think that you would then have to implement the back functionality manually: when the user pressed back you have code that pops the stack (e.g. in Activity::onBackPressed override). So, wherever you do that, you can reverse the setDrawerIndicatorEnabled.

I've used next thing:
getSupportFragmentManager().addOnBackStackChangedListener(new FragmentManager.OnBackStackChangedListener() {
#Override
public void onBackStackChanged() {
if(getSupportFragmentManager().getBackStackEntryCount() > 0){
mDrawerToggle.setDrawerIndicatorEnabled(false);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
else {
getSupportActionBar().setDisplayHomeAsUpEnabled(false);
mDrawerToggle.setDrawerIndicatorEnabled(true);
}
}
});

If your up action bar button doesn't work, don't forget to add the listener :
// Navigation back icon listener
mDrawerToggle.setToolbarNavigationClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onBackPressed();
}
});
I've got some trouble implementing a drawer navigation with a home button, everything worked except the action buton.

Try handling the Home item selection in the MainActivity depending on the state of the DrawerToggle. This way you don't have to add same code to every fragment.
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Only handle with DrawerToggle if the drawer indicator is enabled.
if (mDrawerToggle.isDrawerIndicatorEnabled() &&
mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action buttons
switch (item.getItemId()) {
// Handle home button in non-drawer mode
case android.R.id.home:
onBackPressed();
return true;
default:
return super.onOptionsItemSelected(item);
}
}

FOLLOW UP
The solution given by #dzeikei is neat, but it can be extended, when using fragments, to automatically handle setting back the drawer indicator when the backstack is empty.
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Only handle with DrawerToggle if the drawer indicator is enabled.
if (mDrawerToggle.isDrawerIndicatorEnabled() &&
mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action buttons
switch (item.getItemId()) {
// Handle home button in non-drawer mode
case android.R.id.home:
// Use getSupportFragmentManager() to support older devices
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.popBackStack();
// Make sure transactions are finished before reading backstack count
fragmentManager.executePendingTransactions();
if (fragmentManager.getBackStackEntryCount() < 1){
mDrawerToggle.setDrawerIndicatorEnabled(true);
}
return true;
default:
return super.onOptionsItemSelected(item);
}
}
EDIT
For the question of #JJD.
The fragments are held/managed in an activity. The above code is written once in that activity, but only handle the up caret for the onOptionsItemSelected.
In one of my apps I also needed to handle the behavior of the up caret when the back button was pressed. This can be handle by overriding onBackPressed.
#Override
public void onBackPressed() {
// Use getSupportFragmentManager() to support older devices
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.executePendingTransactions();
if (fragmentManager.getBackStackEntryCount() < 1){
super.onBackPressed();
} else {
fragmentManager.executePendingTransactions();
fragmentManager.popBackStack();
fragmentManager.executePendingTransactions();
if (fragmentManager.getBackStackEntryCount() < 1){
mDrawerToggle.setDrawerIndicatorEnabled(true);
}
}
};
Note the code duplication between onOptionsItemSelected and onBackPressed which can be avoided by creating a method and calling that method in both places.
Also note I add two more times executePendingTransactions which in my case was required or else I had sometimes strange behaviors of the up caret.

I created an interface for the hosting activity to update the view state of the hamburger menu. For top level fragments I set the toggle to true and for fragments for which I want to display the up < arrow I set the toggle to false.
public class SomeFragment extends Fragment {
public interface OnFragmentInteractionListener {
public void showDrawerToggle(boolean showDrawerToggle);
}
private OnFragmentInteractionListener mListener;
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
this.mListener = (OnFragmentInteractionListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString() + " must implement OnFragmentInteractionListener");
}
}
#Override
public void onResume() {
super.onResume();
mListener.showDrawerToggle(false);
}
}
Then in my Activity ...
public class MainActivity extends Activity implements SomeFragment.OnFragmentInteractionListener {
private ActionBarDrawerToggle mDrawerToggle;
public void showDrawerToggle(boolean showDrawerIndicator) {
mDrawerToggle.setDrawerIndicatorEnabled(showDrawerIndicator);
}
}

This answer was working but there was a little problem with it.
The getSupportActionBar().setDisplayHomeAsUpEnabled(false) was not called explicitly and it was causing drawer icon to be hidden even when there were no items in the backstack so changing the setActionBarArrowDependingOnFragmentsBackStack() method worked for me.
private void setActionBarArrowDependingOnFragmentsBackStack() {
int backStackEntryCount = getSupportFragmentManager()
.getBackStackEntryCount();
// If there are no items in the back stack
if (backStackEntryCount == 0) {
// Please make sure that UP CARAT is Hidden otherwise Drawer icon
// wont display
getSupportActionBar().setDisplayHomeAsUpEnabled(false);
// Display the Drawer Icon
mDrawerToggle.setDrawerIndicatorEnabled(true);
} else {
// Show the Up carat
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
// Hide the Drawer Icon
mDrawerToggle.setDrawerIndicatorEnabled(false);
}
}

Logic is clear.
Show back button if fragment back stack is clear.
Show material hamburger-back animation if fragment stack is not clear.
getSupportFragmentManager().addOnBackStackChangedListener(
new FragmentManager.OnBackStackChangedListener() {
#Override
public void onBackStackChanged() {
syncActionBarArrowState();
}
}
);
private void syncActionBarArrowState() {
int backStackEntryCount = getSupportFragmentManager().getBackStackEntryCount();
mNavigationDrawerFragment.setDrawerIndicatorEnabled(backStackEntryCount == 0);
}
//add these in Your NavigationDrawer fragment class
public void setDrawerIndicatorEnabled(boolean flag){
ActionBar actionBar = getActionBar();
if (!flag) {
mDrawerToggle.setDrawerIndicatorEnabled(false);
actionBar.setDisplayHomeAsUpEnabled(true);
mDrawerToggle.setHomeAsUpIndicator(getColoredArrow());
} else {
mDrawerToggle.setDrawerIndicatorEnabled(true);
}
mDrawerToggle.syncState();
getActivity().supportInvalidateOptionsMenu();
}
//download back button from this(https://www.google.com/design/icons/) website and add to your project
private Drawable getColoredArrow() {
Drawable arrowDrawable = ContextCompat.getDrawable(getActivity(), R.drawable.ic_arrow_back_black_24dp);
Drawable wrapped = DrawableCompat.wrap(arrowDrawable);
if (arrowDrawable != null && wrapped != null) {
// This should avoid tinting all the arrows
arrowDrawable.mutate();
DrawableCompat.setTint(wrapped, Color.GRAY);
}
return wrapped;
}

If you take a look at the GMAIL app and come here to search for the carret/affordance icon..
I would ask you to do this, none of the above answer was clear. i was able to modify the accepted answer.
NavigationDrawer --> Listview contains subfragments.
subfragments will be listed like this
firstFragment == position 0 ---> this will have subfragments --> fragment
secondFragment
thirdFragment and so forth....
In firstFragment you have other fragment.
Call this on DrawerActivity
getFragmentManager().addOnBackStackChangedListener(new FragmentManager.OnBackStackChangedListener() {
#Override
public void onBackStackChanged() {
if (getFragmentManager().getBackStackEntryCount() > 0) {
mDrawerToggle.setDrawerIndicatorEnabled(false);
} else {
mDrawerToggle.setDrawerIndicatorEnabled(true);
}
}
});
and in fragment
setHasOptionsMenu(true);
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Get item selected and deal with it
switch (item.getItemId()) {
case android.R.id.home:
//called when the up affordance/carat in actionbar is pressed
activity.onBackPressed();
return true;
}
return false;
}
On the OnBackPressed Drawer activity method set the drawer toggle to true to enable navigation list icon again.
Thanks,
Pusp

You can look at this little example!
https://github.com/oskarko/NavDrawerExample

IMO, using onNavigateUp() (as shown here) in riwnodennyk's or Tom's solution is cleaner and seems to work better. Just replace the onOptionsItemSelected code with this:
#Override
public boolean onSupportNavigateUp() {
if (getSupportFragmentManager().getBackStackEntryCount() > 0) {
// handle up navigation
return true;
} else {
return super.onSupportNavigateUp();
}
}