Disabling navigation drawer, toggling home-button/up-indicator in fragments

Question

The setup

I have an activity whose contentView is an instance of a DrawerLayout, which has a navigation drawer with a drawer indicator displayed in the action bar. The activity contains a Fragment, let's call it ListFragment, which contains a list of options. When an option is clicked, I replace the ListFragment with a DetailFragment.

At this point, I would like to display an "up" navigation option instead of the navigation drawer indicator. I'm able to display the "up" icon if I disable the drawer indicator by calling mDrawerToggle.setDrawerIndicatorEnabled(false), but this only removes the drawer icon--it does not remove the functionality--that is, when I click the caret, the navigation drawer is still opened.

Additionally, in these subviews, I would like to disable the opening of the drawer by dragging from the edge of the screen. I have tried doing this by calling setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED) but it doesn't seem to have disabled this functionality.

I have tried extending the ActionBarDrawerToggle class to prevent opening the drawer when the indicator is clicked--however, all that happens is that the overriding action (the "up" navigation) is performed, but the drawer still opens.

I have also implemented the steps in Switching between Android Navigation Drawer image and Up caret when using fragments . It works insofar as displaying the caret goes, but despite overriding the up button functionality, the menu still opens (the app does navigate back--it just also opens the drawer).

Question

So, long story short: is there any (preferably clean and elegant, but at this point I'll go with hacky) way to achieve these things when my layout root is a DrawerLayout:

1. Replace the drawer indicator with an "up" caret (tentatively doable via mDrawerToggle.setDrawerIndicatorEnabled(false))
2. Prevent the drawer from opening when the caret is clicked, and instead override with my own "up" functionality
3. Prevent the drawer from opening when I drag from the edge of the screen.

Edit

All right, it looks like if I both override ActionBarDrawerToggle AND onOptionsItemSelected, the menu does not open when I click the caret. But it still opens if I drag from the edge. Help!

Answer 1

Short Code

public void setDrawerState(boolean isEnabled) {
    if ( isEnabled ) {
        mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
        drawerToggle.onDrawerStateChanged(DrawerLayout.LOCK_MODE_UNLOCKED);
        drawerToggle.setDrawerIndicatorEnabled(true);
        drawerToggle.syncState();

    }
    else {
        mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
        drawerToggle.onDrawerStateChanged(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
        drawerToggle.setDrawerIndicatorEnabled(false);
        drawerToggle.syncState();
    }
}

Answer 2

This is only part of the solution that I arrived at, but it was quite hard to figure out this bug, so I'm leaving this here for posterity's sake.

This how I was defining the ListView for my navigation drawer:

<ListView
    android:id="@+id/listview_drawer"
    android:layout_width="240dp"
    android:layout_height="match_parent"
    android:layout_gravity="start|bottom"
    android:background="#111"
    android:choiceMode="singleChoice"
    android:divider="@android:color/transparent"
    android:dividerHeight="0dp" />

Even after calling setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED) I was still able to slide the drawer open.

However, after changing the layout_gravity to "start" this problem seems to be resolved.

I was able to reproduce this issue in a sample, navigation-drawer-only app, so it does appear to be a reproducible issue not unique to my situation.

Answer 3

Building on sonida's answer. After calling setDrawerIndicatorEnabled(false), onNavigateUp wasn't being called still. So, I just created a new onClickListener that called it:

public void setDrawerState(boolean isEnabled) {
    if ( isEnabled ) {
        mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
        drawerToggle.setDrawerIndicatorEnabled(true);
        drawerToggle.syncState();

    }
    else {
        mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
        drawerToggle.setDrawerIndicatorEnabled(false);
        drawerToggle.setToolbarNavigationClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onSupportNavigateUp();
            }
        });
        drawerToggle.syncState();
    }
}

also I think

drawerToggle.onDrawerStateChanged(DrawerLayout.LOCK_MODE_UNLOCKED);

has been depreciated, but it works fine without it.

Answer 4

You need to disable swipe and disable the actionbar home button:

Use the below code that builds on the code already given to disable swipe

  public void setDrawerState(boolean isEnabled) {
        if ( isEnabled ) {
            mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
            mDrawerToggle.onDrawerStateChanged(DrawerLayout.LOCK_MODE_UNLOCKED);
            mDrawerToggle.setDrawerIndicatorEnabled(true);
            mDrawerToggle.syncState();
            getActivity().getActionBar().setHomeButtonEnabled(true);

        }
        else {
            mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
            mDrawerToggle.onDrawerStateChanged(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
            mDrawerToggle.setDrawerIndicatorEnabled(false);
            mDrawerToggle.syncState();
            getActivity().getActionBar().setHomeButtonEnabled(false);
        }
    }

Answer 5

Building on answer by @sonida And after using the tweaks given by @luca992 and @jai.

I tried above suggested codes But the "up" or "Back" arrow in left side of action bar was just not showing up in my app. But luckily I was able to fix that.

I had to add this extra line of code in setNavigationDrawerState() [Ref: android.support.v7.app.ActionBarDrawerToggle.setHomeAsUpIndicator ]

toggle.setHomeAsUpIndicator(R.drawable.ic_keyboard_backspace_white_24dp);

I downloaded the drawable: ic_keyboard_backspace_white_24dp from Material.io

Here is the complete code:

MainActivity.java -> onCreate()

DrawerLayout drawer;
ActionBarDrawerToggle toggle;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // Start: Code automatically generated by Android Studio
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    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();
    // End: Code automatically generated by Android Studio

    // I had to add this listener as the "back" arrow was totally unresponsive
    // Thanks to @luca992
    toggle.setToolbarNavigationClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            onBackPressed();
        }
    });

    // Start: Code automatically generated by Android Studio
    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);
    // End: Code automatically generated by Android Studio

    // More custom code for other stuff
    // ...
}

MainActivity.java -> setNavigationDrawerState()

public void setNavigationDrawerState(boolean isEnabled) {
if ( isEnabled ) {
    drawer.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
    toggle.setDrawerIndicatorEnabled(true);
    toggle.syncState();
}
else {
    drawer.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
    toggle.setDrawerIndicatorEnabled(false);
    // the extra line of code goes here
    toggle.setHomeAsUpIndicator(R.drawable.ic_keyboard_backspace_white_24dp);    

    toggle.syncState();
}

MainActivity.java -> onBackPressed()

@Override
public void onBackPressed() {
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    if (drawer.isDrawerOpen(GravityCompat.START)) {
        drawer.closeDrawer(GravityCompat.START);
    } else if(getSupportFragmentManager().getBackStackEntryCount() > 0){
        getSupportFragmentManager().popBackStack();
    }else {
        super.onBackPressed();
    }
}

MainActivity.java -> startFragment() [dummy function for example]

public void startFragment(){
    MyFrag myFrag = new MyFrag();

    getSupportFragmentManager()
        .beginTransaction()
        .replace(R.id.frag_container ,myFrag)
        .addToBackStack(null)
        .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE)
        .commit();
}

MyFrag.java --> onViewCreated()

@Override
public void onViewCreated (View view, Bundle savedInstanceState){
    super.onViewCreated(view, savedInstanceState);

    // Say, using an implemented interface Make call to MainActivitiy's  setNavigationDrawerState() passing false
    // setNavigationDrawerState(false)

    // ...
}

MyFrag.java --> onDestroyView()

@Override
public void onDestroyView(){
    // Say, using an implemented interface Make call to MainActivitiy's setNavigationDrawerState() passing true 
    // setNavigationDrawerState(true)

    super.onDestroyView();
}