Develop Reference

Some features of Activity stops working onRestart()

I have created a navigation drawer in my application, Its working fine, but when i open another activity and go back to previous activity, the button of navigation drawer stops working, Although navigation drawer is still there. If i slide from left to right it opens the drawer, but when i click on Hamburger icon, it just doesn't do anything.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_base_navigation);
ViewGroup content = (ViewGroup) findViewById(R.id.base_layout);
getLayoutInflater().inflate(getLayoutRes(), content, true);
drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout_main);
headerLayout= (FrameLayout) findViewById(R.id.header_layout);
btnOpenDrawer= (Button) findViewById(R.id.btn_openDrawer);
homeLayout= (LinearLayout) findViewById(R.id.home_layout);
btnOpenDrawer.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
drawerLayout.openDrawer(Gravity.LEFT);
}
});
Kindly guide me that what i need to add in onRestart(). Do i need to write all this code in onRestart() as well?

Up navigation in `AppCompatActivity` with `Fragments`

I am trying to set up proper navigation in my application, which replaces Fragments in a main content area, so I have only one single Activity. I have one main Fragment and several subFragments, for example a Fragment for preferences. Everything works fine when using the back button, but I want to implement the up navigation including icon in addition to this. I am using the ActionBar fetched with Activity.getSupportActionBar() together with a Toolbar from appcompat and an ActionBarDrawerToggle.
I followed this tutorial when setting up my Drawer in the first place.
Current behavior:
When I start the app, the list/drawer icon is shown in the left part of the ActionBar. When I click this, the Drawer opens and I can select items. Sub Fragments are replaced into my content and the back button pops the stack, taking me back to the previous Fragment.
Missing behavior:
The list/drawer icon in the top left is never replaced by the back arrow icon and I cannot figure out how to implement this properly. The Drawer is always pulled out when clicking the list/drawer icon, no matter which Fragment I am in.
What have I tried:
I tried following this answer. It kinda works, meaning that the back arrow icon is set in the sub Fragments, but clicking the back arrow still opens the Drawer instead of providing up navigation. Also, when using the back button to go "up", the list/drawer icon is replaced by nothing.
I also tried following this answer. Here, the desired ActionBar behavior/look is implemented in the onCreate() method of the various Fragments. Using this I could get the back arrow up, but still the Drawer is pulled when clicking the arrow.
Various other minor things and hacks.
My questions:
What is wrong in my code below?
Is it correct/normal to use the combination ActionBar, Toolbar and ActionBarDrawerToggle to implement the Drawer navigation together with up navigation?
MyActivity.onCreate():
#Override
protected void onCreate(Bundle savedInstanceState)
{
// Other stuff
// Setup drawer.
mDrawerFragment = (DrawerFragment)
getSupportFragmentManager().findFragmentById(R.id.mm_navigation_drawer);
mDrawerFragment.initialize(this, (DrawerLayout)findViewById(R.id.mm_drawer_layout), toolbar);
}
DrawerFragment class
public class DrawerFragment extends Fragment
{
private MyActivity mMyActivity;
private MyActionBarDrawerToggle mMyBarDrawerToggle;
private DrawerLayout mDrawerLayout;
private FragmentDrawerListener mFragmentDrawerListener;
private View mContainerView;
public void initialize(MyActivity myActivity, final DrawerLayout drawerLayout, final Toolbar toolbar)
{
mMyActivity = myActivity;
mFragmentDrawerListener = mMyActivity;
mContainerView = myActivity.findViewById(R.id.mm_navigation_drawer);
mMyActionBarDrawerToggle = new MyActionBarDrawerToggle(myActivity, drawerLayout, toolbar, R.string.mm_drawer_open, R.string.mm_drawer_close);
mDrawerLayout = drawerLayout;
mDrawerLayout.setDrawerListener(mMyActionBarDrawerToggle);
mDrawerLayout.post(new Runnable()
{
#Override
public void run()
{
mMyActionBarDrawerToggle.syncState();
}
});
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, final ViewGroup container, Bundle savedInstanceState)
{
// Not relevant, just create and return the View.
}
}
MyActivity.onDrawerItemSelected()
The implementation of the interface FragmentDrawerListener is done in the MyActivity class. It simply replaces the content area with other Fragments, using FragmentTransactions.
#Override
public void onDrawerItemSelected(View view, int postion)
{
switch (postion)
{
case DrawerAdapter.ITEM_FILTERED_RECIPES:
showFilteredRecipesFragment();
break;
case DrawerAdapter.ITEM_SELECTED_RECIPES:
showSelectedRecipesFragment();
break;
case DrawerAdapter.ITEM_SHOPPING_LIST:
showShoppingListFragment();
break;
case DrawerAdapter.ITEM_SETTINGS:
showSettingsFragment();
break;
case DrawerAdapter.ITEM_ABOUT:
showAboutFragment();
break;
}
}
MyActionBarDrawerToggle class
public class MyActionBarDrawerToggle extends ActionBarDrawerToggle
{
private MyActivity mMyActivity;
private Toolbar mToolbar;
public MyActionBarDrawerToggle(Activity activity, DrawerLayout drawerLayout, Toolbar toolbar, int openDrawerContentDescRes, int closeDrawerContentDescRes)
{
super(activity, drawerLayout, toolbar, openDrawerContentDescRes, closeDrawerContentDescRes);
mMyActivity = (MyActivity) activity;
mToolbar = toolbar;
}
#Override
public void onDrawerOpened(View drawerView)
{
super.onDrawerOpened(drawerView);
mMyActivity.invalidateOptionsMenu();
}
#Override
public void onDrawerClosed(View drawerView)
{
super.onDrawerClosed(drawerView);
mMyActivity.invalidateOptionsMenu();
}
#Override
public void onDrawerSlide(View drawerView, float slideOffset)
{
super.onDrawerSlide(drawerView, slideOffset);
mToolbar.setAlpha(1 - slideOffset / 2);
}
}
The DrawerFragment is inflated in the main layout using a simple, static Fragment instance like this:
<fragment
android:id="#+id/my_navigation_drawer"
android:name="com.my.company.gui.drawer.DrawerFragment"
android:layout_width="#dimen/my_nav_drawer_width"
android:layout_height="match_parent"
android:layout_gravity="start"
app:layout="#layout/my_drawer_navigation_fragment"
tools:layout="#layout/my_drawer_navigation_fragment">
</fragment>

If you're using material design for you app, then it is expected that you use the Toolbar to replace the Actionbar in your activity. You will still maintain your ActionBarDrawerToggle and functionality will remain the same.
As for your fragments, as long as they are 'housed' by the same activtiy (i.e the activity with the drawer), changing fragments will not cause the drawer toggle to change the back arrow. It will only change if you navigate to a new activity. Only then will the main activity be treated as home and with the other activities having a back arrow to navigate back

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

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:
Replace the drawer indicator with an "up" caret (tentatively doable via mDrawerToggle.setDrawerIndicatorEnabled(false))
Prevent the drawer from opening when the caret is clicked, and instead override with my own "up" functionality
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!

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();
}
}

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.

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.

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);
}
}

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();
}

How to open Drawer Layout only with button?

I'm working on application that has a tab structure, and use sliding movements to move through the tabs.
But now, I want to apply Drawer Layout. The problem is that the Drawer has slide to open events. How I can delete this event? My idea was that the Drawer only could open and close with a button. Is this possible?
Thanks!

Just write
drawer.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
to prevent menu from listening to gesture
and use openDrawer and closeDrawer to change menu visibility

By default the DrawerLayout is initially hidden from the view unless you put a code to open the Drawer, by the time there is a sliding event triggered.
From the Navigation Drawer example, the contain content_frame is used to dynamically display views inside the Drawer using fragments.
<FrameLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</FrameLayout>
From the Fragment's onCreateView() you can include a button somewhere that has OnClickListener where in you put this code,
//For me a better way in avoiding a `null pointer` in getting the DrawerLayout
final DrawerLayout drawer = (DrawerLayout) getActivity().findViewById(R.id.drawer_layout);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
//Opens the Drawer
drawer.openDrawer(Your View, Usually a ListView);
}
return false;
});
You Can also use* to close the drawer.
drawer.closeDrawer(Your View, Usually a ListView);

you can write this way
mButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
drawer.openDrawer(navigationView);
}
});

If you want to navigate between drawer item on click of button inside your fragments,
you can use this
((YourMainActivity)getActivity()).selectItem(position);

Navigation drawer - Disable click through on items behind the drawer

Is there any way to make sure that the navigation drawer stays on top of the content in the fragment?
I created a small test application with dummy data. 10 fragments with a corresponding numbered button and textview. The issue is with the fact that the fragment elements seem to have higher priority than the navigation drawer.
As seen in the screenshot, once I attempt to open up the "0 fragment" it instead opts to register the click on the button behind the navigation drawer. Pressing any other content item works fine, but this is as long as there are no other interactable items beneath them. What can I do to have the navigation drawer properly stay on top of the content behind it?

Set android:clickable="true" tag on sliding pane layout.

The problem seem not because of click focus,
Visit https://developer.android.com/training/implementing-navigation/nav-drawer.html#DrawerLayout
The main content view (the FrameLayout above) must be the first child in the DrawerLayout because the XML order implies z-ordering and the drawer must be on top of the content.

In my fragment drawer, I set TouchListener to return True.
It worked for me
mFragmentContainerView.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
return true;
}
});

I solved it in a different way.
Here is my code for setting up the Drawer:
/**
* Setup Navigation Drawer
*/
private void setDrawer() {
NavigationDrawerFragment mNavigationDrawerFragment = (NavigationDrawerFragment) getFragmentManager().findFragmentById(R.id.fragment_drawer);
mNavigationDrawerFragment.setup(R.id.fragment_drawer, (DrawerLayout) findViewById(R.id.drawer), mToolbar);
}
the setup method is inside my NavigationDrawerFragment, here is my code for it:
/**
* Users of this fragment must call this method to set up the navigation drawer interactions.
*
* #param fragmentId The android:id of this fragment in its activity's layout.
* #param drawerLayout The DrawerLayout containing this fragment's UI.
* #param toolbar The Toolbar of the activity.
*/
public void setup(int fragmentId, DrawerLayout drawerLayout, Toolbar toolbar) {
View mFragmentContainerView = (View) getActivity().findViewById(fragmentId).getParent();
DrawerLayout mDrawerLayout = drawerLayout;
//noinspection deprecation
mDrawerLayout.setStatusBarBackgroundColor(getResources().getColor(R.color.colorPrimaryDark));
ActionBarDrawerToggle mActionBarDrawerToggle = new ActionBarDrawerToggle(getActivity(), mDrawerLayout, toolbar, "Drawer opened", "Drawer closed") {
#Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
if (!isAdded()) return;
// Solution:
// Disable click event on views below Navigation Drawer
mFragmentContainerView.setClickable(false);
getActivity().invalidateOptionsMenu();
}
#Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
if (!isAdded()) return;
// Solution:
// Enable click event on views below Navigation Drawer
mFragmentContainerView.setClickable(true);
getActivity().invalidateOptionsMenu();
}
};
// Defer code dependent on restoration of previous instance state.
mDrawerLayout.post(new Runnable() {
#Override
public void run() {
mActionBarDrawerToggle.syncState();
}
});
//noinspection deprecation
mDrawerLayout.setDrawerListener(mActionBarDrawerToggle);
}
That's it

You have to set clickable, focusable and focusableInTouchMode in the highest view of your drawer's layout.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true"
android:focusable="true"
android:focusableInTouchMode="true">

Well, I found one solution for this issue. When the drawer is being opened you can bring the nav bar to the front by calling the bringToFront()-method on the layout you use. This makes sure the navigation drawer stays on top of any underlying content until a new item has been selected.
I.e:
#Override
public void onDrawerOpened(View drawerView)
{
activity.getActionBar().setTitle("Select content");
activity.invalidateOptionsMenu();
drawerLayout.bringToFront();
}