Develop Reference

Android Navigation Drawer Items linked to Fragments

In my application I created a Navigation Drawer which has 5 items, once an item is clicked in the Navigation Drawer, I can correctly check the item and show the new fragment using the fragment manager.
But currently I have three problems:
My application has floating action buttons, that of course perform actions and open new fragments, so I need to handle that "Fragment changing" in the navigation drawer too, setting as checked the current item which corresponds to the fragment showed.
I SORT OF solved this problem, but using a single method that
performs the fragment transaction in the MainActivity and meanwhile
checks the new item. So everytime a Fragment want to call another
Fragment, it uses this function passing the nav_drawer_item_id as a
parameter. I think that this solutions sucks, so if you have a better idea, it would be really welcome!
My biggest problem is that when the user press the Android Back Button, the fragment pops back to previous one (or sometimes I call popback() programmatically because I am done with that specific fragment )
I really don't know how to solve this problem because I can't check the correct item in the navigation drawer once a fragment is popped back, I need to know which fragment it is.
I need to show the new fragment once the navigation drawer is closed in order to respect "Android Rules" ( And because it's nice ).
I sort of solved this problem too, by setting a "nextFragment" inside the navigation drawer onNavigationItemSelectedListener and by showing the new fragment inside the drawer onDrawerClosed. Is it the only solution?
I'm not posting any code because it really doesn't deserve to be seen, so here is some extra info:
I have a single activity which contains the Navigation Drawer and currently handles the fragment transactions.
I have 6 fragments, 5 called from the Navigation Drawer and 1 called only from others UI components, but this one doesn't need to be checked on the drawer of course.
I tought about a solution and it was like "Setting the checked item FROM the fragment that is showed", but I didn't find any way to get the Navigation Drawer from the Fragment in order to set the proper item checked.

Implement FragmentManager.OnBackStackChangedListener in your activity to get notified whenever something is popped off the back stack and sync the navigation drawer from the callback. That should get rid of the problem caused when the back button is pressed.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
.....
getSupportFragmentManager().addOnBackStackChangedListener(this);
}
#Override
public void onBackStackChanged() {
// Get the currently active fragment
Fragment fragment =
getSupportFragmentManager().findFragmentById(R.id.fragments_frame);
// Check which fragment is active, check the
// correct selection and set the title accordingly
if (fragment instanceof FragmentAtPosition0) {
setCheckedAndTitle(0);
} else if (fragment instanceof FragmentAtPosition1) {
setCheckedAndTitle(1);
}
}
private void setCheckedAndTitle(int position) {
MenuItem item = navView.getMenu().getItem(position);
item.setChecked(true);
setTitle(item.getTitle());
}
As for the other two cases that you mentioned, I think the solutions you have mentioned are the preferred ways.

Android DrawerLayout.setDrawerLockMode() not working

I have a Navigation Drawer (appcompat v7) in my app which is working perfectly fine.
Now I want to disable it, until the user buys an in-app-purchase to unlock additional functionality. So in my Activity.onCreate(), after initializing the drawer and populating it, I am calling this function:
mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
This function is not doing anything. The drawer continues to open and close as normal after tapping the drawer carat in the actionbar. I tried calling this function in Activity.onResume() without any difference.
What is the correct way to use this function?
(I tried looking online for answers, but couldn't find anything which addresses my issue). Any help is appreciated, as I am stuck on this issue for quite sometime now.

mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
is only disabling the opening drawer layout by swiping till you click navigation drawer icon
keep a boolean variable
write mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED); in onStart() and also write below lines of code
#Override
public boolean onOptionsItemSelected(android.view.MenuItem item) {
if(!disabled)
{
if (item.getItemId() == android.R.id.home) {
if (mDrawerLayout.isDrawerOpen(mDrawerLinearLayout)) {
mDrawerLayout.closeDrawer(mDrawerLinearLayout);
} else {
mDrawerLayout.openDrawer(mDrawerLinearLayout);
}
}
}
return super.onOptionsItemSelected(item);
}
this will work for sure

When you call setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED) it locks opening and closing drawer only by swipes.
The drawer continues to open and close as normal after tapping the drawer carat in the action bar because your drawer will still respond to calls to openDrawer(int), closeDrawer(int) although a drawer is locked.
You need to add some logic in your action bar menu button listener and not to call openDrawer(int) when you don't want it to open.
Btw, it is okay to call setDrawerLockMode(int) in onСreate

There is a bug with DrawerLayout and used gravity. I have reported it here:
https://issuetracker.google.com/issues/136738274

Simple side drawer issue in android

I implemented my left slide drawer for menu options using Simple-side-drawer Library. Its working fine but the issue is, the drawer layout menu options are responding to onclick events even after my drawer is closed state ie (menu options responding to onclick events from my MainActivity).

You can check SimpleSideDrawer's isClosed() method to make sure if it is closed.
SimpleSideDrawer menuDrawerLeft = new SimpleSideDrawer( this );
menuDrawerLeft.setLeftBehindContentView(R.layout.menu_drawer_left);
final Button buttonInLeftDrawer = (Button)findViewById(R.id.buttonInLeftDrawer);
buttonInLeftDrawer.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
if (menuDrawerLeft.isClosed()) {return;}
//runs only when the drawer is open
}
});

Without looking at your code it's hard to give any suggestions.
One advice though. Are you using this library:
https://github.com/adamrocker/simple-side-drawer
If so, please consider using the built-in Navigation Drawer that Google has released instead. It follows the design guidelines (which Simple Side Drawer does not) and is well tested to work.
See these resources for your implementation:
http://developer.android.com/design/patterns/navigation-drawer.html
http://developer.android.com/training/implementing-navigation/nav-drawer.html

How to open navigation drawer with animation at startup

I implemented navigation drawer as described here in android developer portal.
And everything works fine. Now I read android guidlines here. In section "Introduce the user to the drawer at first use" there is described I should open the drawer when application launches first. Now my idea for implementing this is to open the drawer after opening the app (and maybe close it again).
Now I tried to call myDrawer.openDrawer(Gravity.LEFT) in onCreate and the drawer is open when the app launches, but there's no animation. So onCreate seems to be the wrong place. Where should I place the call to openDrawer to let the user see the animation?

I guess you can do this by delaying the animation. For example:
#Override
protected void onResume() {
super.onResume();
myDrawer.postDelayed(new Runnable() {
#Override
public void run() {
myDrawer.openDrawer(Gravity.LEFT)
}
}, 1000);
}
However the fact that the Android Guidelines suggests the drawer to be opened when the application launches for the first time, does not imply it should be animated.

Show/Hide DrawerLayout depends on current fragment

I have an Activity class that have a DrawerLayout. That layout shows a list in Drawer and let user to switch between fragments. In these Fragments, there are some URLs and when user clicsk on that, a WebviewFragment would be shown. However, I don't want to show the DrawerLayout in the WebViewFragment. Instead, I would prefer user would being redirected to previous Fragment.
Is there any way for me to show/hide the DrawerLayout depends on what the current Fragment is?
I try to call mDrawerLayout.setVisibility(View.GONE), but it seems that it is not complete. At least the ActionBar icon is still the drawer icon.

You can use this method to lock or unlock the drawer: DrawerLayout.setDrawerLockMode(...). (There are also two other versions of this method to specify a lock mode for specific drawers.) To lock, use DrawerLayout.LOCK_MODE_LOCKED_CLOSED; to unlock, use DrawerLayout.LOCK_MODE_UNLOCKED.
If you are using the ActionBarDrawerToggle, you need to add some extra code to prevent the drawer from opening when they click the ActionBarDrawerToggle if you've locked the drawer.
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// check lock mode before passing to ActionBarDrawerToggle
// I assume your drawer is on the left; if not, use Gravity.RIGHT
int lockMode = mDrawer.getDrawerLockMode(Gravity.LEFT);
if (lockMode == DrawerLayout.LOCK_MODE_UNLOCKED &&
mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle your other action bar items...
return super.onOptionsItemSelected(item);
}

Why not open a new Activity that has only a WebView as its content instead? Then the user will have to press the back button to go back to the Activity with the DrawerLayout, and then there will be no problems.
Alternatively, you don't have to have such an activity yourself, you can let Android find a browser for them to open instead using this code:
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("HTTP_URL_GOES_HERE"));
startActivity(intent);