Develop Reference

How to prevent NavigationDrawer from being opened by gesture, but allow from hamburger icon in Support Design Library 23.1.1.1

I have a ViewPager where pages contain charting views which react to sliding movements. Due to this i resorted to changing the page by sliding from the edge of the screen. But that leaves me with the problem that this is also the gesture to open the NavigationDrawer.
Until now i used the following code to achieve this:
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(GetLayoutId());
Toolbar = FindViewById<Toolbar>(Resource.Id.toolbar);
if (Toolbar != null)
{
// set this flag so the colors colorPrimaryDark and android:statusBarColor have an effect
// setting android:statusBarColor to transparent causes the drawer to be dran underneath a translucent status bar
Window.AddFlags(WindowManagerFlags.DrawsSystemBarBackgrounds);
// make the toolbar the replacement of the action bar
SetSupportActionBar(Toolbar);
}
// add the hamburger icon
m_DrawerLayout = FindViewById<DrawerLayout>(Resource.Id.drawer_layout);
var actionBarDrawerToggle = new ActionBarDrawerToggle(this, m_DrawerLayout, Toolbar, Resource.String.empty, Resource.String.empty);
m_DrawerLayout.AddDrawerListener(actionBarDrawerToggle);
// make sure the drawer can't be opened by swiping, to do this we set the lock mode to closed
// but if we just do this, it can't be closed by swiping either, so set the lock mode to unlocked when the drawer is opened, and locked again when it's closed
m_DrawerLayout.DrawerOpened += (object sender, DrawerLayout.DrawerOpenedEventArgs e) =>
{
m_DrawerLayout.SetDrawerLockMode(DrawerLayout.LockModeUnlocked);
};
m_DrawerLayout.DrawerClosed += (object sender, DrawerLayout.DrawerClosedEventArgs e) =>
{
m_DrawerLayout.SetDrawerLockMode(DrawerLayout.LockModeLockedClosed);
};
m_DrawerLayout.SetDrawerLockMode(DrawerLayout.LockModeLockedClosed);
//calling sync state is necessay or else the hamburger icon wont show up
actionBarDrawerToggle.SyncState();
}
It worked as intended, until i updated to the Android Support Design Library 23.1.1.1, now setting the lock mode to closed also prevents the menu from being opened by tapping on the hamburger icon.

Looking at the source code for the latest version of the ActionBarDrawerToggle class, this does indeed seem to be the new intended behavior. It's toggle() method now looks like this:
private void toggle() {
int drawerLockMode = mDrawerLayout.getDrawerLockMode(GravityCompat.START);
if (mDrawerLayout.isDrawerVisible(GravityCompat.START)
&& (drawerLockMode != DrawerLayout.LOCK_MODE_LOCKED_OPEN)) {
mDrawerLayout.closeDrawer(GravityCompat.START);
}
else if (drawerLockMode != DrawerLayout.LOCK_MODE_LOCKED_CLOSED) {
mDrawerLayout.openDrawer(GravityCompat.START);
}
}
whereas it previously just checked the drawer's opened/closed state.
This is unfortunate, since it will now take a workaround to achieve the old behavior. Perhaps the simplest thing to do is just to revert to an older version of the support library. However, if you want to keep the newest version, one possible solution is as follows.
First remove the Toolbar argument from the ActionBarDrawerToggle constructor call.
actionBarDrawerToggle = new ActionBarDrawerToggle(this,
m_DrawerLayout,
Resource.String.empty,
Resource.String.empty);
This will cause the Activity's OnOptionsItemSelected() method to fire upon clicking the toggle, since you've set the Toolbar as the support ActionBar. We will also need to call SupportActionBar.SetDisplayHomeAsUpEnabled(true) to actually show the toggle, since the ActionBarDrawerToggle class interacts somewhat differently with an ActionBar than it does with a Toolbar, with respect to their child Views.
In the Activity's OnOptionsItemSelected() method, we then simply unlock the drawer before calling the toggle's own OnOptionsItemSelected() method, which handles the opening and closing of the drawer.
public override bool OnOptionsItemSelected (IMenuItem item)
{
switch (item.ItemId)
{
case Android.Resource.Id.Home:
m_DrawerLayout.SetDrawerLockMode(DrawerLayout.LockModeUnlocked);
actionBarDrawerToggle.OnOptionsItemSelected(item);
return true;
...
}
...
}
Your actionBarDrawerToggle will need to be a field of your Activity, and you can remove the DrawerOpened handler.

Is it possible to set different actions for floating action button in differet fragments?

I am working or an app where I have 4 fragments in viewpager and floating action button (fab). When I click on fab there appear 3 subfabs. Each of them start different activities where user can search data from different fragments. Is it possible to set fab so that if I click on it while I'm in first fragment it'll open an activity for searching inside this fragment, onClick inside second - search for second and etc. The issue is that now clicking on sub fab while I'm in some fragment I can search data from another fragment too and it's a bit weird. I understand question is kinda strange, if something is unclear I'll explain further

You can make FAB button public and implement onClick listener in each fragment.
You should override setUserVisibleHint and put your code onResume so getActivity() will not return null. Fab button will have different actions in different fragments.
Here's an example, inside each fragment when you want Fab click listener:
#Override
public void setUserVisibleHint(boolean visible)
{
super.setUserVisibleHint(visible);
if (visible && isResumed())
{
onResume();
}
}
#Override
public void onResume()
{
super.onResume();
if (!getUserVisibleHint())
{
return;
}
MainActivity mainActivity = (MainActivity)getActivity();
mainActivity.fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//Do what you want
}
});
}

You can check in onclick method of floating action button which fragment is currently opened and calling it.
Call findFragmentById() on FragmentManager and determine which fragment is in your R.id.frameTitle container.

why Actionbar title keep displaying the backstack title on hardware back button pressed?

I'm trying to change the title of activity, where i'm going to the activity from the fragments, so when i click on the hardware back button the title doesn't chnage to the one that i have provided in that activity i.e
this.setTitle("Something");
I have also tried
setTitle("Something");
Update
When i use the below mentioned code i run into a problem where the title that i assign in the mainActivity stay in all the pages, hence in the frgament getActivity().setTitle(""); seems to be useless in this case, so instead of changing everywhere the title using the below mentioned code i.e changing the actionbar title using getsupportactionbar.settitle(""), is there an easy way to do.
By any means can i know if an activity has came from the system back button back state or not?

You can handle this situation with onResume() method
//...
#Override
onResume(){
super.onResume();
this.getActionBar().setTitle("Something");
}
ı think, that will help you.

Try this:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
ActionBar ab = getActionBar();
ab.setTitle("My Title");
ab.setSubtitle("sub-title");
}
EDIT:
For SupportActionBar use:
ActionBar actionBar = getSupportActionBar();
EDIT2:
I use this to set Title from every fragment
#Override
public void onResume() {
super.onResume();
// Set the title
getActivity().getActionBar() //getSupportActionBar()
.setTitle(R.string.fragment_title);
}

If you always add your fragment to backstack when changing, then backpress can be override as follows to always get your previous fragment's title:
#Override
public void onBackPressed() {
int T= getFragmentManager().getBackStackEntryCount();
if (getFragmentManager().getBackStackEntryCount() == 0) {
finish();
}
else if (getFragmentManager().getBackStackEntryCount() == 1) {
finish();
}
else {
String tr = getFragmentManager().getBackStackEntryAt(T-2).getName();
setTitle(tr);
getFragmentManager().popBackStack();
}
}

If you are occured this in Kotlin just remove Label from destination in Your navigation graph.

getSupportActionbar().setTitle("Your Title")
You have to call this whenever you want to change your title.
If you are switching between fragments call the method again and switch it back to your old title.

How to make ActionMode aligned with custom Toolbar

I have an activity with new support Toolbar and navigation drawer. The Toolbar relates to the content e.g. list of items. Multiple items can be selected - then ActionMode is shown (Context Action Bar). However the system ActionMode position, size and layout order does not correspond to the Toolbar, which would be appropriate.
Question is: how can I adjust the system ActionMode to correspond to (be aligned with) my Toolbar? Or is there any other recommended alternative? See my cases below
Portrait
NavDrawer may be hidden in side (1-green) - this is OK for both Toolbar and ActionMode.
Both Toolbar and its content are overlapped by the navigation drawer the drawer is opened (2-yellow). However, when ActionMode is active, it is displayed always over the NavDrawer (3-red), but I want it to look like (2-yellow), because the ActionMode is related to the hidden content.
This issue is similar to this question:
How to make the Contextual ActionMode Bar overlay the appcompat-v7 Toolbar but not the navigation drawer?
Tablet/landscape
In landscape the NavDrawer fits next to the toolbar and content (left). The ActionMode always overlays the NavDrawer and Toolbar and has full screen width (right-red). Again I would like the ActionMode to be in the same position as Toolbar is (left-yellow).

I solved it by using another Toolbar (actionModeToolbar), which I can put anywhere in layout and show or hide it as appropriate.
I found some useful hints how to use Toolbar here:
https://gist.github.com/gabrielemariotti/ae63392e1c70bc33af8b
Here is how I created ActionMode using Toolbar with legacy ActionMode.Callback. I have used methods similar to system ActionMode for partial compatibility.
Note, that ActionMode.Callback is not required anymore, because system ActionMode is not used and code can be refactored.
class ToolbarActionMode {
Toolbar actionModeToolbar;
ActionMode.Callback callback;
void startActionMode() {
actionModeToolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override public void onClick(View v) {
toolbarActionMode.finishActionMode();
}
});
actionModeToolbar.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() {
#Override public boolean onMenuItemClick(MenuItem menuItem) {
return callback.onActionItemClicked(null, menuItem);
}
});
// will create menu using inflateMenu(R.menu.menu_res)
callback.onCreateActionMode(null, null);
invalidate();
actionModeToolbar.setVisibility(View.VISIBLE);
}
void finishActionMode() {
callback.onDestroyActionMode(null);
actionModeToolbar.setVisibility(View.GONE);
}
void invalidate() {
// will update title + menu
callback.onPrepareActionMode(null, actionModeToolbar.getMenu());
}
void setTitle(CharSequence title) {
actionModeToolbar.setTitle(title);
}
void inflateMenu(int menuRes) {
actionModeToolbar.inflateMenu(menuRes);
}
}

Changing Subtitles in Fragments?

Hi there I have been using the ViewPagerIndicator library for some time now and I want my action-bar's title to change every time the user swipes to another Fragment to the other pages here is the code I am thinking off but it is just not working.
Activity miz = getActivity();
miz.setTitle("Miz");
I have put this code in all my Fragments displaying different titles every time but for some reason it is not working properly as it is always late. I think it may have something to do with the OnCreate , OnResume or OnPause and can not lay a finger on it can some one help ? I want the Title of the Action Bar to change while the next Fragment is visible to the user.
I have also though of some code like this
#Override
public void onResume() {
// TODO Auto-generated method stub
super.onResume();
Activity miz = getActivity();
miz.setTitle("Miz");
}

Regular :
this.getActivity().getActionBar().setTitle(title);
With ActioBarSherlock :
this.getSherlockActivity().getSupportActionBar().setTitle(title);

You can do this:
ActionBar actionBar = getActionBar(); // or getSupportActionBar() for ActionBarSherlock
actionBar.setTitle("test");
In a Fragment:
ActionBar actionBar = getActivity().getActionBar();
actionBar.setTitle("test");

Try
((AppCompatActivity) getActivity()).getSupportActionBar().setTitle("Miz");
It will work
Reference: Setting a subtitle on my Toolbar from a fragment