Develop Reference

Pin a view to bottom of screen in BottomSheetDialog Fragment

I've used BottomSheetDialogFragment in my project and I've designed it as below:
Target: I'm going to stick the bottom menu of BottomSheetDialog to bottom of the screen, in either mode collapse and expand.
So in BottomSheetDialog layout, I used RelativeLayout for parent and "layout_alignParentBottom" for menu container, As below:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/bottomSheetContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
app:behavior_hideable="true"
app:behavior_peekHeight="0dp"
app:layout_behavior="android.support.design.widget.BottomSheetBehavior"
tools:context=".MyBottomSheetDialogFragment">
<RelativeLayout
android:id="#+id/topSection"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true">
....
</RelativeLayout>
<android.support.v4.widget.NestedScrollView
android:id="#+id/descriptionContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/topSection">
....
</android.support.v4.widget.NestedScrollView>
<HorizontalScrollView
android:id="#+id/iconsContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true">
....
</HorizontalScrollView>
</RelativeLayout>
But the dialogue is as follows:
As you can see, the bottom menu is not visible at first.
Can someone help me to solve this problem?

To solve this, several things came to my mind when I tried, but I did not succeed.
But this finally solved for me by this way:
For collapse mode, I set the bottomSheetBehavior's peekHeight to 1/3 of the screen (with the following code):
View bottomSheetContainer = dialog.findViewById(R.id.bottomSheetContainer);
View parent = (View) bottomSheetContainer.getParent();
CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) parent.getLayoutParams();
BottomSheetBehavior bottomSheetBehavior = (BottomSheetBehavior) params.getBehavior();
View inflatedView = View.inflate(getContext(), R.layout.word_details_bottom_sheet, null);
inflatedView.measure(0, 0);
int screenHeight = getActivity().getResources().getDisplayMetrics().heightPixels;
if (bottomSheetBehavior != null) {
bottomSheetBehavior.setPeekHeight(screenHeight /3);
}
So I decided to do it:
1- for collapse mode: bottomSheet container's height = bottomSheetBehavior's peekHeight
2- for expand mode: bottomSheet container's height = full screen Height
So I wrote the following code (full code):
WordDetailsBottomSheet.java
public class WordDetailsBottomSheet extends BottomSheetDialogFragment {
public WordDetailsBottomSheet() { // Required empty public constructor }
#NotNull
#Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
BottomSheetDialog dialog = new BottomSheetDialog(getActivity(), 0);
dialog.setContentView(R.layout.word_details_bottom_sheet);
View bottomSheetContainer = dialog.findViewById(R.id.bottomSheetContainer);
View parent = (View) bottomSheetContainer.getParent();
CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) parent.getLayoutParams();
BottomSheetBehavior bottomSheetBehavior = (BottomSheetBehavior) params.getBehavior();
View inflatedView = View.inflate(getContext(), R.layout.word_details_bottom_sheet, null);
inflatedView.measure(0, 0);
int screenHeight = getActivity().getResources().getDisplayMetrics().heightPixels;
int statusBarHeight = getStatusBarHeight();
if (bottomSheetBehavior != null) {
bottomSheetBehavior.setPeekHeight(screenHeight / BOTTOM_SHEET_PEEK_HEIGHT_PERCENT);
bottomSheetContainer.getLayoutParams().height = bottomSheetBehavior.getPeekHeight();
}
bottomSheetBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
#Override
public void onStateChanged(#NonNull View view, int newState) {
switch (newState) {
case BottomSheetBehavior.STATE_EXPANDED:
bottomSheetContainer.getLayoutParams().height = screenHeight-statusBarHeight;
break;
case BottomSheetBehavior.STATE_COLLAPSED:
bottomSheetContainer.getLayoutParams().height = bottomSheetBehavior.getPeekHeight();
break;
case BottomSheetBehavior.STATE_HIDDEN:
dismiss();
break;
default:
break;
}
}
#Override
public void onSlide(#NonNull View view, float slideOffset) {
}
});
return dialog;
}
public int getStatusBarHeight() {
int result = 0;
int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
if (resourceId > 0) {
result = getResources().getDimensionPixelSize(resourceId);
}
return result;
}
}
word_details_bottom_sheet.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/bottomSheetContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
app:behavior_hideable="true"
app:behavior_peekHeight="0dp"
app:layout_behavior="android.support.design.widget.BottomSheetBehavior"
tools:context=".MyBottomSheetDialogFragment">
<RelativeLayout
android:id="#+id/topSection"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true">
....
</RelativeLayout>
<android.support.v4.widget.NestedScrollView
android:id="#+id/descriptionContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/topSection">
....
</android.support.v4.widget.NestedScrollView>
<HorizontalScrollView
android:id="#+id/iconsContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true">
....
</HorizontalScrollView>
</RelativeLayout>
In the xml file, things that matter are:
1- parent id (android:id="#+id/bottomSheetContainer")
2- iconsContainer align (android:layout_alignParentBottom="true")

As you can see, the bottom menu is not visible at first.
Can someone help me to solve this problem?
I'm guessing that this behavior is working perfectly and fine because you set layout_height of NestedScrollView (Center content) to wrap_content which means, it will be wrapped by the content inside.
Meanwhile;
android:layout_alignParentBottom="true"
To HorizontalScrollView (below layout) means that it will be under the other layouts which it currently is!
So, if you are trying to see if it is working fine or not, set 100dp-50dp (or a specific size which you can see when BottomSheetDialog show up) instead of wrap_content to NestedScrollView then you probably would see that the below layout with the other layouts will be visible.
Anyways, everything's in this layout looks correct and fine. As well as pictures says the truth.

Can we perform 2 different actions in Snack bar at a time in android?

I am creating an android application in which i want to use Snack Bar,
In a that snack bar i want 2 different words on which we have to perform 2 different actions.

From the Google design specifications:
Each snackbar may contain a single action, neither of which may be “Dismiss” or “Cancel.”
For multiple actions, use a dialog.

Thanks Shailesh, I had to modify the code in order to make it work for me.
my_snackbar.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:id="#+id/my_snackbar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/dark_grey"
android:padding="15dp">
<TextView
android:id="#+id/message_text_view"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight=".6"
android:gravity="center_vertical"
android:text="Two button snackbar"
android:textColor="#color/white"/>
<TextView
android:id="#+id/first_text_view"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight=".2"
android:gravity="center"
android:text="ONE"
android:textColor="#FFDEAD"/>
<TextView
android:id="#+id/second_text_view"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight=".2"
android:gravity="center"
android:text="TWO"
android:textColor="#FFDEAD"/>
</LinearLayout>
In your activity call this method whenever you want to show the snackbar:
private void showTwoButtonSnackbar() {
// Create the Snackbar
LinearLayout.LayoutParams objLayoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
snackbar = Snackbar.make(this.findViewById(android.R.id.content), message, Snackbar.LENGTH_INDEFINITE);
// Get the Snackbar layout view
Snackbar.SnackbarLayout layout = (Snackbar.SnackbarLayout) snackbar.getView();
// Set snackbar layout params
int navbarHeight = getNavBarHeight(this);
FrameLayout.LayoutParams parentParams = (FrameLayout.LayoutParams) layout.getLayoutParams();
parentParams.setMargins(0, 0, 0, 0 - navbarHeight + 50);
layout.setLayoutParams(parentParams);
layout.setPadding(0, 0, 0, 0);
layout.setLayoutParams(parentParams);
// Inflate our custom view
View snackView = getLayoutInflater().inflate(R.layout.my_snackbar, null);
// Configure our custom view
TextView messageTextView = (TextView) snackView.findViewById(R.id.message_text_view);
messageTextView.setText(message);
TextView textViewOne = (TextView) snackView.findViewById(R.id.first_text_view);
textViewOne.setText("ALLOW");
textViewOne.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.d("Allow", "showTwoButtonSnackbar() : allow clicked");
snackbar.dismiss();
}
});
TextView textViewTwo = (TextView) snackView.findViewById(R.id.second_text_view);
textViewTwo.setText("DENY");
textViewTwo.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.d("Deny", "showTwoButtonSnackbar() : deny clicked");
snackbar.dismiss();
}
});
// Add our custom view to the Snackbar's layout
layout.addView(snackView, objLayoutParams);
// Show the Snackbar
snackbar.show();
}
To get nav bar height:
public static int getNavBarHeight(Context context) {
int result = 0;
int resourceId = context.getResources().getIdentifier("navigation_bar_height", "dimen", "android");
if (resourceId > 0) {
result = context.getResources().getDimensionPixelSize(resourceId);
}
return result;
}

As #Elias N answer's each Snackbar may contain a single action. If you want to set more then action in Snackbar then you need to create your own layout. Please try this i hope this will help you.
Create one xml file my_snackbar.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#000000">
<TextView
android:layout_width="0dp"
android:layout_height="50dp"
android:layout_weight=".7"
android:gravity="center_vertical"
android:text="Please select any one"
android:textColor="#color/white"/>
<TextView
android:id="#+id/txtOne"
android:layout_width="0dp"
android:layout_height="50dp"
android:layout_weight=".1"
android:gravity="center"
android:text="ONE"
android:textColor="#color/red"/>
<TextView
android:id="#+id/txtTwo"
android:layout_width="0dp"
android:layout_height="50dp"
android:layout_weight=".1"
android:gravity="center"
android:text="TWO"
android:textColor="#color/red"/>
</LinearLayout>
Now in your activity file do the following code.
public void myCustomSnackbar()
{
// Create the Snackbar
LinearLayout.LayoutParams objLayoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
Snackbar snackbar = Snackbar.make(llShow, "", Snackbar.LENGTH_LONG);
// Get the Snackbar's layout view
Snackbar.SnackbarLayout layout = (Snackbar.SnackbarLayout) snackbar.getView();
layout.setPadding(0,0,0,0);
// Hide the text
TextView textView = (TextView) layout.findViewById(android.support.design.R.id.snackbar_text);
textView.setVisibility(View.INVISIBLE);
LayoutInflater mInflater = (LayoutInflater)getSystemService(LAYOUT_INFLATER_SERVICE);
// Inflate our custom view
View snackView = getLayoutInflater().inflate(R.layout.my_snackbar, null);
// Configure the view
TextView textViewOne = (TextView) snackView.findViewById(R.id.txtOne);
textViewOne.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.i("One", "First one is clicked");
}
});
TextView textViewTwo = (TextView) snackView.findViewById(R.id.txtTwo);
textViewTwo.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.i("Two", "Second one is clicked");
}
});
// Add the view to the Snackbar's layout
layout.addView(snackView, objLayoutParams);
// Show the Snackbar
snackbar.show();
}
For more detail please read this documentation and here.

You can use BottomSheetDialog and disguise it as a SnackBar. Only difference would be that it will be dismissed by swiping down instead of right and it can stay there until user dismissed it while SnackBar eventually fades away.
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/fragment_history_menu_bottom"
style="#style/Widget.Design.BottomNavigationView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:orientation="horizontal"
android:background="#color/cardview_dark_background"
app:layout_behavior="android.support.design.widget.BottomSheetBehavior">
<android.support.v7.widget.AppCompatTextView
android:id="#+id/appCompatTextView"
android:layout_width="wrap_content"
android:layout_height="19dp"
android:layout_gravity="center_vertical"
android:layout_marginStart="8dp"
android:layout_weight="0.6"
android:text="Load More ?"
android:textAppearance="#style/TextAppearance.Design.Snackbar.Message"
android:textColor="#color/cardview_light_background"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<LinearLayout
android:id="#+id/fragment_history_bottom_sheet_delete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right|end"
android:layout_weight="0.4"
android:clickable="true"
android:focusable="true"
android:foreground="?android:attr/selectableItemBackground"
android:orientation="horizontal"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent">
<android.support.v7.widget.AppCompatButton
style="#style/Widget.AppCompat.Button.Borderless.Colored"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Yes" />
<android.support.v7.widget.AppCompatButton
style="#style/Widget.AppCompat.Button.Borderless"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="No"
android:textColor="#color/cardview_light_background" />
</LinearLayout>
</android.support.constraint.ConstraintLayout>
and use it as following (Kotlin)
val dialog = BottomSheetDialog(this)
dialog.setContentView(this.layoutInflater.inflate(R.layout.bottom_sheet_load_prompt,null))
dialog.show()
result will be similar to SnackBar

Here is a proper solution with Kotlin I first deployed it when working on Fulguris.
Using Kotlin extension we expand our Snackbar class as follows:
/**
* Adds an extra action button to this snackbar.
* [aLayoutId] must be a layout with a Button as root element.
* [aLabel] defines new button label string.
* [aListener] handles our new button click event.
*/
fun Snackbar.addAction(#LayoutRes aLayoutId: Int, #StringRes aLabel: Int, aListener: View.OnClickListener?) : Snackbar {
addAction(aLayoutId,context.getString(aLabel),aListener)
return this;
}
/**
* Adds an extra action button to this snackbar.
* [aLayoutId] must be a layout with a Button as root element.
* [aLabel] defines new button label string.
* [aListener] handles our new button click event.
*/
fun Snackbar.addAction(#LayoutRes aLayoutId: Int, aLabel: String, aListener: View.OnClickListener?) : Snackbar {
// Add our button
val button = LayoutInflater.from(view.context).inflate(aLayoutId, null) as Button
// Using our special knowledge of the snackbar action button id we can hook our extra button next to it
view.findViewById<Button>(R.id.snackbar_action).let {
// Copy layout
button.layoutParams = it.layoutParams
// Copy colors
(button as? Button)?.setTextColor(it.textColors)
(it.parent as? ViewGroup)?.addView(button)
}
button.text = aLabel
/** Ideally we should use [Snackbar.dispatchDismiss] instead of [Snackbar.dismiss] though that should do for now */
//extraView.setOnClickListener {this.dispatchDismiss(BaseCallback.DISMISS_EVENT_ACTION); aListener?.onClick(it)}
button.setOnClickListener {this.dismiss(); aListener?.onClick(it)}
return this;
}
We then need to define our button resource:
<?xml version="1.0" encoding="utf-8"?>
<!--
Used to create and extra button in our snackbar popup messages.
Though most properties including layout params and colors are overridden at runtime.
They are just copied from the standard snackbar action button to make sure they both lookalike.
-->
<Button xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/snackbar_extra_action"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="0dp"
android:layout_marginStart="0dp"
android:layout_gravity="center_vertical|right|end"
android:paddingTop="14dp"
android:paddingBottom="14dp"
android:paddingLeft="12dp"
android:paddingRight="12dp"
android:textColor="?attr/colorAccent"
style="?attr/borderlessButtonStyle"/>
Here is how you use it:
Snackbar.make(aView, aMessage, aDuration).setAction(R.string.button_one) {
// Do your thing after regular button press
}.addAction(R.layout.snackbar_extra_button, R.string.button_two){
//Do your thing after extra button push
}.show()

Another hacky workaround you could try (works in my case).
final Snackbar snackbar = Snackbar.make(view, "UNDO MARKED AS READ", Snackbar.LENGTH_LONG);
snackbar.setAction("DISMISS", new View.OnClickListener() {
#Override
public void onClick(View v) {
if (snackbar != null)
snackbar.dismiss();
}
});
View snackbarView = snackbar.getView();
int snackbarTextId = android.support.design.R.id.snackbar_text;
TextView textView = (TextView) snackbarView.findViewById(snackbarTextId);
textView.setTextColor(Color.WHITE);
textView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (snackbar != null)
snackbar.dismiss();
// undo mark as unread code
}
});
snackbar.show();

Following Shaileshs solution:
snackbar class
public class SnackbarOfflineErrorNotification {
/**
* A view from the content layout.
*/
#NonNull
private final View view;
#NonNull
private Context context;
/**
* The snack bar being shown.
*/
#Nullable
private Snackbar snackbar = null;
/**
* Construct a new instance of the notification.
*
* #param view A view from the content layout, used to seek an appropriate anchor for the
* Snackbar.
*/
public SnackbarOfflineErrorNotification(#NonNull final View view, #NonNull Context context) {
this.view = view;
this.context = context;
}
public void showOfflineError (){
if (snackbar == null){
//create snackbar
snackbar = Snackbar.make(this.view, R.string.offline_text, LENGTH_INDEFINITE);
// Create the Snackbar
LinearLayout.LayoutParams objLayoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
// Get the Snackbar's layout view
Snackbar.SnackbarLayout layout = (Snackbar.SnackbarLayout) snackbar.getView();
layout.setPadding(0,0,0,0);
// Hide the text
TextView textView = (TextView) layout.findViewById(android.support.design.R.id.snackbar_text);
textView.setVisibility(View.INVISIBLE);
// Inflate our custom view
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View snackView = inflater.inflate(R.layout.snackbar_offline, null);
// Configure the view
Button btnOne = (Button) snackView.findViewById(R.id.btnOne);
btnOne.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// action 1
}
});
Button btnTwo = (Button) snackView.findViewById(R.id.btnTwo);
btnTwo.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// action 2
}
});
// Add the view to the Snackbar's layout
layout.addView(snackView, objLayoutParams);
// Show the Snackbar
snackbar.show();
}
}
/**
* Hides the currently displayed error.
*/
public void hideError() {
if (snackbar != null) {
snackbar.dismiss();
snackbar = null;
}
}
}
snackbar xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#000000">
<TextView
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_weight=".7"
android:gravity="center_vertical"
android:text="offline"
android:textColor="#color/white"
android:paddingLeft="16dp"/>
<Button
android:id="#+id/btnOne"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_weight=".1"
android:gravity="center"
android:text="one" />
<Button
android:id="#+id/btnTwo"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_weight=".1"
android:gravity="center"
android:text="two"/>
</LinearLayout>
target activity
constructor(){
snackbarOfflineErrorNotification = new SnackbarOfflineErrorNotification(findViewById(R.id.coordinator_layout), getApplicationContext());
}
public void hideSnackbar(){
snackbarOfflineErrorNotification.hideError();
}
public showSnackbar(){
snackbarOfflineErrorNotification.showOfflineError();
}

You can use "dismiss" as another actions
Snackbar snackbar = Snackbar.make(requireView(), "Marked as read", BaseTransientBottomBar.LENGTH_SHORT);
snackbar.setAction("undo", view -> {
//undo action
});
snackbar.addCallback(new Snackbar.Callback() {
#Override
public void onDismissed(Snackbar transientBottomBar, int event) {
//dismiss action
}
});
snackbar.show();

How to use BottomSheetDialog?

I want to try BottomSheetDialog introduced in Android Support Library 23.2 but it doesn't seem to work correctly. Here is what the doc says:
While BottomSheetBehavior captures the persistent bottom sheet case, this release also provides a BottomSheetDialog and
BottomSheetDialogFragment to fill the modal bottom sheets use case.
Simply replace AppCompatDialog or AppCompatDialogFragment with their
bottom sheet equivalents to have your dialog styled as a bottom
sheet."
So I changed my AppCompatDialog to BottomSheetDialog:
package my.package.ui.dialog;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.support.design.widget.BottomSheetDialog;
import my.package.R;
public class AccountActionsDialog extends BottomSheetDialog {
public AccountActionsDialog(Context context) {
super(context);
if (context instanceof Activity) {
setOwnerActivity((Activity) context);
}
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(getLayoutInflater().inflate(R.layout.dialog_account_actions, null));
}
}
Here is my layout file:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#ff0000"
android:padding="16dp"
android:text="Delete account"
android:textColor="#ffffff" />
</LinearLayout>
Then I use the following code in my Activity:
new AccountActionsDialog(this).show();
My screen becomes dimmed but the content of my dialog is not visible. Any thoughts on what might be missing? It works fine when I use AppCompatDialog instead.

Instead of having a separate class, you can simply create an instance for BottomSheetDialog in your Activity/Fragment like following and you can use it. It is very easier and simpler I think.
val dialog = BottomSheetDialog(this)
val bottomSheet = layoutInflater.inflate(R.layout.bottom_sheet, null)
bottomSheet.buttonSubmit.setOnClickListener { dialog.dismiss() }
dialog.setContentView(bottomSheet)
dialog.show()

This is the layout file of BottomSheetDialog.
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:soundEffectsEnabled="false">
<FrameLayout
android:id="#+id/design_bottom_sheet"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
app:layout_behavior="#string/bottom_sheet_behavior"
style="?attr/bottomSheetStyle"/>
</android.support.design.widget.CoordinatorLayout>
Your content view is inside the view design_bottom_sheet, it will be positioned center vertically by CoordinatorLayout, and BottomSheetBehavior will offset it.
mParentHeight = parent.getHeight();
mMinOffset = Math.max(0, mParentHeight - child.getHeight());
mMaxOffset = mParentHeight - mPeekHeight;
if (mState == STATE_EXPANDED) {
ViewCompat.offsetTopAndBottom(child, mMinOffset);
} else if (mHideable && mState == STATE_HIDDEN) {
ViewCompat.offsetTopAndBottom(child, mParentHeight);
} else if (mState == STATE_COLLAPSED) {
ViewCompat.offsetTopAndBottom(child, mMaxOffset);
}
It intented to positon design_bottom_sheet at mMaxOffset, but actually the initial getTop of the child view is not 0, but (mParentHeight - childHeight) / 2, so you view if offset more than the desired offset.
Find the view design_bottom_sheet and set its gravity to Gravity.TOP | Gravity.CENTER_HORIZONTAL will fix it. But, if the childHeight is less than mPeekHeight, there will be blank area below you content view.
However, if peekHeight > childHeight, the mMaxOffset will less than mMinOffset, which will cause weird behavior.
Maybe the code should be changed to
mMaxOffset = Math.max((mParentHeight - mPeekHeight), mMinOffset);
insted of
mMaxOffset = mParentHeight - child.getHeight();

Here's the issue on code.google.com https://code.google.com/p/android/issues/detail?id=201793
An issue some users are seeing boils down to the FrameLayout that wraps our content view being centered vertically. The BottomSheetBehavior only works if this view is top aligned. I haven't figured out what causes the FrameLayout to become centered vertically yet, but here's a possible workaround:
View contentView = ...
// You may have to measure your content view first.
dialog.setContentView(contentView);
// Change this to a percentage or a constant, whatever you want to do.
// The default is 1024 - any views smaller than this will be pulled off
// the bottom of the screen.
float peekHeight = contentView.getMeasuredHeight();
View parent = (View)contentView.getParent();
BottomSheetBehavior behavior = BottomSheetBehavior.from(parent);
behavior.setPeekHeight(peekHeight);
CoordinatorLayout.LayoutParams layoutParams =
(CoordinatorLayout.LayoutParams)parent.getLayoutParams();
layoutParams.gravity = Gravity.TOP | Gravity.CENTER_HORIZONTAL;

I was expriencing the same issue, dimmed background and content not visible. Here is how I managed to workaround it by setting the content view in setupDialog() hidden method.
public class CustomBottomSheetDialogFragment extends BottomSheetDialogFragment {
private TextView mOffsetText;
private TextView mStateText;
private BottomSheetBehavior.BottomSheetCallback mBottomSheetBehaviorCallback = new BottomSheetBehavior.BottomSheetCallback() {
#Override
public void onStateChanged(#NonNull View bottomSheet, int newState) {
setStateText(newState);
if (newState == BottomSheetBehavior.STATE_HIDDEN) {
dismiss();
}
}
#Override
public void onSlide(#NonNull View bottomSheet, float slideOffset) {
setOffsetText(slideOffset);
}
};
private LinearLayoutManager mLinearLayoutManager;
private ApplicationAdapter mAdapter;
#Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
return super.onCreateDialog(savedInstanceState);
}
#Override
public void onViewCreated(View contentView, #Nullable Bundle savedInstanceState) {
super.onViewCreated(contentView, savedInstanceState);
}
#Override
public void setupDialog(Dialog dialog, int style) {
super.setupDialog(dialog, style);
View contentView = View.inflate(getContext(), R.layout.bottom_sheet_dialog_content_view, null);
dialog.setContentView(contentView);
mBottomSheetBehavior = BottomSheetBehavior.from(((View) contentView.getParent()));
if (mBottomSheetBehavior != null) {
mBottomSheetBehavior.setBottomSheetCallback(mBottomSheetBehaviorCallback);
}
mOffsetText = (TextView) contentView.findViewById(R.id.offsetText);
mStateText = (TextView) contentView.findViewById(R.id.stateText);
}
}
And the layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="#+id/offsetText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#android:color/black" />
<TextView
android:id="#+id/stateText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#android:color/black" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>

It started to work when I set fixed height for my TextView (200dp), although for some height values it still behaves incorrectly. Obviously it's an issue of support lib. There are already few reports related to BottomSheetDialog in the bug tracker:
https://code.google.com/p/android/issues/detail?id=201793&sort=-opened&colspec=ID%20Status%20Priority%20Owner%20Summary%20Stars%20Reporter%20Opened
https://code.google.com/p/android/issues/detail?id=201826

Show a SnackBar on the top (below of the toolbar)

I'm trying to show a SnackBar on top below of the ToolBar in my MainActivity,
I've tried this code :
mToolbar = (Toolbar) findViewById(R.id.toolbar);
Snackbar snack = Snackbar.make(findViewById(android.R.id.content), "Had a snack at Snackbar", Snackbar.LENGTH_LONG);
View view = snack.getView();
FrameLayout.LayoutParams params =(FrameLayout.LayoutParams)view.getLayoutParams();
params.gravity = Gravity.TOP;
view.setLayoutParams(params);
snack.show();
but the SnackBar is showing on the top, but not below the Toolbar.
I want something similar to Hangout application like :
Main Activity:
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/Coordinator"
xmlns:fab="http://schemas.android.com/apk/res-auto"
tools:context=".MainActivity">
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<ImageView
android:layout_width="75dp"
android:layout_height="28dp"
android:src="#drawable/athena"/>
</android.support.v7.widget.Toolbar>
<ProgressBar
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/progressBar5"
android:layout_marginTop="10dp"
android:layout_gravity="center_horizontal" />
<android.support.v4.widget.SwipeRefreshLayout
android:id="#+id/swipeRefreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="#+id/my_recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical" />
</android.support.v4.widget.SwipeRefreshLayout>
</LinearLayout>
<com.melnykov.fab.FloatingActionButton
android:id="#+id/add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
android:layout_margin="16dp"
fab:fab_colorNormal="#color/colorPrimary"
android:src="#drawable/ic_action_name9" />
</android.support.design.widget.CoordinatorLayout>
I'm using TSnackbar, the SnackBar is showing over the toolbar
TSnackbar.make(findViewById(android.R.id.content),"Hello from TSnackBar.",TSnackbar.LENGTH_LONG).show();

set margin on top of snackbar
Snackbar snack = Snackbar.make(findViewById(android.R.id.content), "Had a snack at Snackbar", Snackbar.LENGTH_LONG);
View view = snack.getView();
FrameLayout.LayoutParams params =(FrameLayout.LayoutParams)view.getLayoutParams();
params.gravity = Gravity.CENTER_HORIZONTAL | Gravity.TOP;
// calculate actionbar height
TypedValue tv = new TypedValue();
int actionBarHeight=0;
if (getTheme().resolveAttribute(R.attr.actionBarSize, tv, true))
{
actionBarHeight = TypedValue.complexToDimensionPixelSize(tv.data,getResources().getDisplayMetrics());
}
// set margin
params.setMargins(0, actionBarHeight, 0, 0);
view.setLayoutParams(params);
snack.show();

use PopupWindow using handler as
if(!topPopupWindow.isShowing()){
topPopupWindow.showAsDropDown(toolbar);
}
handler.removeMessages(0);
handler.sendEmptyMessageDelayed(0,2500);

This worked for me,
set top margin for your snackbar, consider your toolbar size:
View view = snack.getView();
CoordinatorLayout.LayoutParams params2 =(CoordinatorLayout.LayoutParams)view.getLayoutParams();
params2.setMargins(0,50,0,0);

I am giving below the code that I have used in my app and which is working properly for range of devices
Complie : compile 'com.androidadvance:topsnackbar:1.1.1'
define view :
private CoordinatorLayout CSnakbarLayout;
CSnakbarLayout = (CoordinatorLayout) rootView.findViewById(R.id.snackbar_event_mesg);
XML :
<android.support.design.widget.CoordinatorLayout
android:id="#+id/snackbar_event_mesg"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
</RelativeLayout>
</android.support.design.widget.CoordinatorLayout>
Below code in the activity / Fragment you want to implement the Snackbar from top :
/**
* Method to display message for on going Event
*/
private void displaySnackbar() {
int duration = 4000;
final TSnackbar snackbar = TSnackbar.make(CSnakbarLayout, getString(R.string.on_going_event_mesg), TSnackbar.LENGTH_INDEFINITE);
snackbar.setActionTextColor(Color.WHITE);
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
#Override
public void run() {
try {
snackbar.dismiss();
} catch (Exception e) {
e.printStackTrace();
}
}
}, duration);
snackbar.setAction("Ok", new View.OnClickListener() {
#Override
public void onClick(View view) {
snackbar.dismiss();
}
});
View snackbarView = snackbar.getView();
ViewGroup.LayoutParams params = snackbarView.getLayoutParams();
params.height = 300;
snackbarView.setLayoutParams(params);
snackbarView.setBackgroundColor(Color.BLACK);
TextView textView = (TextView) snackbarView.findViewById(com.androidadvance.topsnackbar.R.id.snackbar_text);
textView.setTextColor(Color.WHITE);
textView.setMaxLines(5);
snackbar.show();
}
Thank you :)

Got a solution in Kotlin, Give a try :)
val mainLayout: ConstraintLayout = root.findViewById(R.id.main_layout)
val button: Button = root.findViewById(R.id.button)
button.setOnClickListener {
val snackBar = TSnackbar.make(mainLayout, "Snacking with VectorDrawable", TSnackbar.LENGTH_INDEFINITE)
snackBar.setActionTextColor(Color.WHITE)
snackBar.setIconLeft(R.drawable.ic_announcement_black_24dp, 24f)
val snackBarView = snackBar.view
val tv = TypedValue()
if (activity!!.getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true)) {
val actionBarHeight = TypedValue.complexToDimensionPixelSize(tv.data, resources.displayMetrics)
val params = view!!.getLayoutParams() as FrameLayout.LayoutParams
params.setMargins(0, actionBarHeight, 0, 0)
params.height = 70
snackBarView.setLayoutParams(params)
}
snackBarView.setBackgroundColor(Color.parseColor("#CC00CC"))
val textView = snackBarView.findViewById(com.androidadvance.topsnackbar.R.id.snackbar_text) as TextView
textView.setTextColor(Color.YELLOW)
snackBar.setIconPadding(10)
snackBar.show()
}

Thanks to #Shijil solution i've managed to display MinimalKSnack below the toolbar.
MinimalKSnack minimalKSnack = new MinimalKSnack(MainActivity.this);
minimalKSnack.setMessage(getResources().getString(R.string.notification))
.setStyle(MinimalKSnackStyle.STYLE_SUCCESS)
.setBackgroundColor(R.color.metallic_blue)
.setAnimation(Fade.In.getAnimation(), Fade.Out.getAnimation())
.setDuration(2000);
View view = minimalKSnack.getMinimalSnackView();
LinearLayout.LayoutParams params =(LinearLayout.LayoutParams)view.getLayoutParams();
params.gravity = Gravity.CENTER_VERTICAL | Gravity.TOP;
TypedValue typedValue = new TypedValue();
int actionBarHeight =0;
if(getTheme().resolveAttribute(R.attr.actionBarSize,typedValue,true)){
actionBarHeight = TypedValue.complexToDimensionPixelOffset(typedValue.data,getResources().getDisplayMetrics());
}
params.setMargins(0,actionBarHeight,0,0);
view.setLayoutParams(params);
minimalKSnack.show();
Github Library link onurkagan /
KSnack

How to center align the ActionBar title in Android?

I am trying to use the following code to center the text in the ActionBar, but it aligns itself to the left.
How do you make it appear in the center?
ActionBar actionBar = getActionBar();
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setTitle("Canteen Home");
actionBar.setHomeButtonEnabled(true);
actionBar.setIcon(R.drawable.back);

To have a centered title in ABS (if you want to have this in the default ActionBar, just remove the "support" in the method names), you could just do this:
In your Activity, in your onCreate() method:
getSupportActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
getSupportActionBar().setCustomView(R.layout.abs_layout);
abs_layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:orientation="vertical">
<androidx.appcompat.widget.AppCompatTextView
android:id="#+id/tvTitle"
style="#style/TextAppearance.AppCompat.Widget.ActionBar.Title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:textColor="#FFFFFF" />
</LinearLayout>
Now you should have an Actionbar with just a title. If you want to set a custom background, set it in the Layout above (but then don't forget to set android:layout_height="match_parent").
or with:
getSupportActionBar().setBackgroundDrawable(getResources().getDrawable(R.drawable.yourimage));

I haven't had much success with the other answers... below is exactly what worked for me on Android 4.4.3 using the ActionBar in the support library v7. I have it set up to show the navigation drawer icon ("burger menu button")
XML
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="#+id/actionbar_textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:maxLines="1"
android:clickable="false"
android:focusable="false"
android:longClickable="false"
android:textStyle="bold"
android:textSize="18sp"
android:textColor="#FFFFFF" />
</LinearLayout>
Java
//Customize the ActionBar
final ActionBar abar = getSupportActionBar();
abar.setBackgroundDrawable(getResources().getDrawable(R.drawable.actionbar_background));//line under the action bar
View viewActionBar = getLayoutInflater().inflate(R.layout.actionbar_titletext_layout, null);
ActionBar.LayoutParams params = new ActionBar.LayoutParams(//Center the textview in the ActionBar !
ActionBar.LayoutParams.WRAP_CONTENT,
ActionBar.LayoutParams.MATCH_PARENT,
Gravity.CENTER);
TextView textviewTitle = (TextView) viewActionBar.findViewById(R.id.actionbar_textview);
textviewTitle.setText("Test");
abar.setCustomView(viewActionBar, params);
abar.setDisplayShowCustomEnabled(true);
abar.setDisplayShowTitleEnabled(false);
abar.setDisplayHomeAsUpEnabled(true);
abar.setIcon(R.color.transparent);
abar.setHomeButtonEnabled(true);

Define your own custom view with title text, then pass LayoutParams to setCustomView(), as Sergii says.
ActionBar actionBar = getSupportActionBar()
actionBar.setDisplayShowCustomEnabled(true);
actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
actionBar.setCustomView(getLayoutInflater().inflate(R.layout.action_bar_home, null),
new ActionBar.LayoutParams(
ActionBar.LayoutParams.WRAP_CONTENT,
ActionBar.LayoutParams.MATCH_PARENT,
Gravity.CENTER
)
);
EDITED: At least for width, you should use WRAP_CONTENT or your navigation drawer, app icon, etc. WON'T BE SHOWN (custom view shown on top of other views on action bar). This will occur especially when no action button is shown.
EDITED: Equivalent in xml layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="center_horizontal"
android:orientation="vertical">
This doesn't require LayoutParams to be specified.
actionBar.setCustomView(getLayoutInflater().inflate(R.layout.action_bar_home, null);

Just a quick addition to Ahmad's answer. You can't use getSupportActionBar().setTitle anymore when using a custom view with a TextView. So to set the title when you have multiple Activities with this custom ActionBar (using this one xml), in your onCreate() method after you assign a custom view:
TextView textViewTitle = (TextView) findViewById(R.id.mytext);
textViewTitle.setText(R.string.title_for_this_activity);

Code here working for me.
// Activity
public void setTitle(String title){
getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
TextView textView = new TextView(this);
textView.setText(title);
textView.setTextSize(20);
textView.setTypeface(null, Typeface.BOLD);
textView.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));
textView.setGravity(Gravity.CENTER);
textView.setTextColor(getResources().getColor(R.color.white));
getSupportActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
getSupportActionBar().setCustomView(textView);
}
// Fragment
public void setTitle(String title){
((AppCompatActivity)getActivity()).getSupportActionBar().setHomeButtonEnabled(true);
((AppCompatActivity)getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(true);
TextView textView = new TextView(getActivity());
textView.setText(title);
textView.setTextSize(20);
textView.setTypeface(null, Typeface.BOLD);
textView.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));
textView.setGravity(Gravity.CENTER);
textView.setTextColor(getResources().getColor(R.color.white));
((AppCompatActivity)getActivity()).getSupportActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
((AppCompatActivity)getActivity()).getSupportActionBar().setCustomView(textView);
}

Without customview its able to center actionbar title.
It's perfectly working for navigation drawer as well
int titleId = getResources().getIdentifier("action_bar_title", "id", "android");
TextView abTitle = (TextView) findViewById(titleId);
abTitle.setTextColor(getResources().getColor(R.color.white));
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
abTitle.setGravity(Gravity.CENTER);
abTitle.setWidth(metrics.widthPixels);
getActionBar().setTitle("I am center now");

OK. After a lot of research, combined with the accepted answer above, I have come up with a solution that also works if you have other stuff in your action bar (back/home button, menu button). So basically I have put the override methods in a basic activity (which all other activities extend), and placed the code there. This code sets the title of each activity as it is provided in AndroidManifest.xml, and also does som other custom stuff (like setting a custom tint on action bar buttons, and custom font on the title). You only need to leave out the gravity in action_bar.xml, and use padding instead. actionBar != null check is used, since not all my activities have one.
Tested on 4.4.2 and 5.0.1
public class BaseActivity extends AppCompatActivity {
private ActionBar actionBar;
private TextView actionBarTitle;
private Toolbar toolbar;
#Override
protected void onCreate(Bundle savedInstanceState) {
getWindow().requestFeature(Window.FEATURE_CONTENT_TRANSITIONS);
super.onCreate(savedInstanceState);
...
getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
actionBar = getSupportActionBar();
if (actionBar != null) {
actionBar.setElevation(0);
actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
actionBar.setCustomView(R.layout.action_bar);
LinearLayout layout = (LinearLayout) actionBar.getCustomView();
actionBarTitle = (TextView) layout.getChildAt(0);
actionBarTitle.setText(this.getTitle());
actionBarTitle.setTypeface(Utility.getSecondaryFont(this));
toolbar = (Toolbar) layout.getParent();
toolbar.setContentInsetsAbsolute(0, 0);
if (this.getClass() == BackButtonActivity.class || this.getClass() == AnotherBackButtonActivity.class) {
actionBar.setHomeButtonEnabled(true);
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setDisplayShowHomeEnabled(true);
Drawable wrapDrawable = DrawableCompat.wrap(getResources().getDrawable(R.drawable.ic_back));
DrawableCompat.setTint(wrapDrawable, getResources().getColor(android.R.color.white));
actionBar.setHomeAsUpIndicator(wrapDrawable);
actionBar.setIcon(null);
}
else {
actionBar.setHomeButtonEnabled(false);
actionBar.setDisplayHomeAsUpEnabled(false);
actionBar.setDisplayShowHomeEnabled(false);
actionBar.setHomeAsUpIndicator(null);
actionBar.setIcon(null);
}
}
try {
ViewConfiguration config = ViewConfiguration.get(this);
Field menuKeyField = ViewConfiguration.class.getDeclaredField("sHasPermanentMenuKey");
if(menuKeyField != null) {
menuKeyField.setAccessible(true);
menuKeyField.setBoolean(config, false);
}
} catch (Exception ex) {
// Ignore
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
if (actionBar != null) {
int padding = (getDisplayWidth() - actionBarTitle.getWidth())/2;
MenuInflater inflater = getMenuInflater();
if (this.getClass() == MenuActivity.class) {
inflater.inflate(R.menu.activity_close_menu, menu);
}
else {
inflater.inflate(R.menu.activity_open_menu, menu);
}
MenuItem item = menu.findItem(R.id.main_menu);
Drawable icon = item.getIcon();
icon.mutate().mutate().setColorFilter(getResources().getColor(R.color.white), PorterDuff.Mode.SRC_IN);
item.setIcon(icon);
ImageButton imageButton;
for (int i =0; i < toolbar.getChildCount(); i++) {
if (toolbar.getChildAt(i).getClass() == ImageButton.class) {
imageButton = (ImageButton) toolbar.getChildAt(i);
padding -= imageButton.getWidth();
break;
}
}
actionBarTitle.setPadding(padding, 0, 0, 0);
}
return super.onCreateOptionsMenu(menu);
} ...
And my action_bar.xml is like this (if anyone is interested):
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#color/actionbar_text_color"
android:textAllCaps="true"
android:textSize="9pt"
/>
</LinearLayout>
EDIT: If you need to change the title to something else AFTER the activity is loaded (onCreateOptionsMenu has already been called), put another TextView in your action_bar.xml and use the following code to "pad" this new TextView, set text and show it:
protected void setSubTitle(CharSequence title) {
if (!initActionBarTitle()) return;
if (actionBarSubTitle != null) {
if (title != null || title.length() > 0) {
actionBarSubTitle.setText(title);
setActionBarSubTitlePadding();
}
}
}
private void setActionBarSubTitlePadding() {
if (actionBarSubTitlePaddingSet) return;
ViewTreeObserver vto = layout.getViewTreeObserver();
if(vto.isAlive()){
vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
int padding = (getDisplayWidth() - actionBarSubTitle.getWidth())/2;
ImageButton imageButton;
for (int i = 0; i < toolbar.getChildCount(); i++) {
if (toolbar.getChildAt(i).getClass() == ImageButton.class) {
imageButton = (ImageButton) toolbar.getChildAt(i);
padding -= imageButton.getWidth();
break;
}
}
actionBarSubTitle.setPadding(padding, 0, 0, 0);
actionBarSubTitlePaddingSet = true;
ViewTreeObserver obs = layout.getViewTreeObserver();
obs.removeOnGlobalLayoutListener(this);
}
});
}
}
protected void hideActionBarTitle() {
if (!initActionBarTitle()) return;
actionBarTitle.setVisibility(View.GONE);
if (actionBarSubTitle != null) {
actionBarSubTitle.setVisibility(View.VISIBLE);
}
}
protected void showActionBarTitle() {
if (!initActionBarTitle()) return;
actionBarTitle.setVisibility(View.VISIBLE);
if (actionBarSubTitle != null) {
actionBarSubTitle.setVisibility(View.GONE);
}
}
EDIT (25.08.2016): This does not work with appcompat 24.2.0 revision (August 2016), if your activity has a "back button". I filed a bug report (Issue 220899), but I do not know if it is of any use (doubt it will be fixed any time soon). Meanwhile the solution is to check if the child's class is equal to AppCompatImageButton.class and do the same, only increase the width by 30% (e.g. appCompatImageButton.getWidth()*1.3 before subtracting this value from the original padding):
padding -= appCompatImageButton.getWidth()*1.3;
In the mean time I threw in some padding/margin checks in there:
Class<?> c;
ImageButton imageButton;
AppCompatImageButton appCompatImageButton;
for (int i = 0; i < toolbar.getChildCount(); i++) {
c = toolbar.getChildAt(i).getClass();
if (c == AppCompatImageButton.class) {
appCompatImageButton = (AppCompatImageButton) toolbar.getChildAt(i);
padding -= appCompatImageButton.getWidth()*1.3;
padding -= appCompatImageButton.getPaddingLeft();
padding -= appCompatImageButton.getPaddingRight();
if (appCompatImageButton.getLayoutParams().getClass() == LinearLayout.LayoutParams.class) {
padding -= ((LinearLayout.LayoutParams) appCompatImageButton.getLayoutParams()).getMarginEnd();
padding -= ((LinearLayout.LayoutParams) appCompatImageButton.getLayoutParams()).getMarginStart();
}
break;
}
else if (c == ImageButton.class) {
imageButton = (ImageButton) toolbar.getChildAt(i);
padding -= imageButton.getWidth();
padding -= imageButton.getPaddingLeft();
padding -= imageButton.getPaddingRight();
if (imageButton.getLayoutParams().getClass() == LinearLayout.LayoutParams.class) {
padding -= ((LinearLayout.LayoutParams) imageButton.getLayoutParams()).getMarginEnd();
padding -= ((LinearLayout.LayoutParams) imageButton.getLayoutParams()).getMarginStart();
}
break;
}
}

It works nicely.
activity = (AppCompatActivity) getActivity();
activity.getSupportActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
LayoutInflater inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = inflater.inflate(R.layout.custom_actionbar, null);
ActionBar.LayoutParams p = new ActionBar.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT,
Gravity.CENTER);
((TextView) v.findViewById(R.id.title)).setText(FRAGMENT_TITLE);
activity.getSupportActionBar().setCustomView(v, p);
activity.getSupportActionBar().setDisplayShowTitleEnabled(true);
activity.getSupportActionBar().setDisplayHomeAsUpEnabled(true);
Below layout of custom_actionbar:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/title"
android:layout_width="wrap_content"
android:text="Example"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:ellipsize="end"
android:maxLines="1"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#color/colorBlack" />
</RelativeLayout>

Best and easiest way, specifically for those who just want text view with gravity center without any xml layout.
AppCompatTextView mTitleTextView = new AppCompatTextView(getApplicationContext());
mTitleTextView.setSingleLine();
ActionBar.LayoutParams layoutParams = new ActionBar.LayoutParams(ActionBar.LayoutParams.WRAP_CONTENT, ActionBar.LayoutParams.WRAP_CONTENT);
layoutParams.gravity = Gravity.CENTER;
actionBar.setCustomView(mTitleTextView, layoutParams);
actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM | ActionBar.DISPLAY_HOME_AS_UP);
mTitleTextView.setText(text);
mTitleTextView.setTextAppearance(getApplicationContext(), android.R.style.TextAppearance_Medium);

A Kotlin-only solution that does not require to have changes in the XML Layouts:
//Function to call in onResume() of your activity
private fun centerToolbarText() {
val mTitleTextView = AppCompatTextView(this)
mTitleTextView.text = title
mTitleTextView.setSingleLine()//Remove it if you want to allow multiple lines in the toolbar
mTitleTextView.textSize = 25f
val layoutParams = android.support.v7.app.ActionBar.LayoutParams(
ActionBar.LayoutParams.WRAP_CONTENT,
ActionBar.LayoutParams.WRAP_CONTENT
)
layoutParams.gravity = Gravity.CENTER
supportActionBar?.setCustomView(mTitleTextView,layoutParams)
supportActionBar?.displayOptions = ActionBar.DISPLAY_SHOW_CUSTOM
}

After a lot of research:
This actually works:
getActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
getActionBar().setCustomView(R.layout.custom_actionbar);
ActionBar.LayoutParams p = new ActionBar.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
p.gravity = Gravity.CENTER;
You have to define custom_actionbar.xml layout which is as per your requirement e.g. :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#2e2e2e"
android:orientation="vertical"
android:gravity="center"
android:layout_gravity="center">
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/top_banner"
android:layout_gravity="center"
/>
</LinearLayout>

You need to set ActionBar.LayoutParams.WRAP_CONTENT and ActionBar.DISPLAY_HOME_AS_UP
View customView = LayoutInflater.from(this).inflate(R.layout.actionbar_title, null);
ActionBar.LayoutParams params = new ActionBar.LayoutParams(ActionBar.LayoutParams.WRAP_CONTENT,
ActionBar.LayoutParams.MATCH_PARENT, Gravity.CENTER);
getSupportActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM | ActionBar.DISPLAY_SHOW_HOME | ActionBar.DISPLAY_HOME_AS_UP );

Here is a complete Kotlin + androidx solution, building upon the answer from #Stanislas Heili. I hope it may be useful to others. It's for the case when you have an activity that hosts multiple fragments, with only one fragment active at the same time.
In your activity:
private lateinit var customTitle: AppCompatTextView
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
// stuff here
customTitle = createCustomTitleTextView()
// other stuff here
}
private fun createCustomTitleTextView(): AppCompatTextView {
val mTitleTextView = AppCompatTextView(this)
TextViewCompat.setTextAppearance(mTitleTextView, R.style.your_style_or_null);
val layoutParams = ActionBar.LayoutParams(
ActionBar.LayoutParams.WRAP_CONTENT,
ActionBar.LayoutParams.WRAP_CONTENT
)
layoutParams.gravity = Gravity.CENTER
supportActionBar?.setCustomView(mTitleTextView, layoutParams)
supportActionBar?.displayOptions = ActionBar.DISPLAY_SHOW_CUSTOM
return mTitleTextView
}
override fun setTitle(title: CharSequence?) {
customTitle.text = title
}
override fun setTitle(titleId: Int) {
customTitle.text = getString(titleId)
}
In your fragments:
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
activity?.title = "some title for fragment"
}

The other tutorials I've seen override the whole action bar layout hiding the MenuItems. I've got it worked just doing the following steps:
Create a xml file as following:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:ellipsize="end"
android:maxLines="1"
android:text="#string/app_name"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#android:color/white" />
</RelativeLayout>
And in the classe do it:
LayoutInflater inflator = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = inflator.inflate(R.layout.action_bar_title, null);
ActionBar.LayoutParams params = new ActionBar.LayoutParams(ActionBar.LayoutParams.WRAP_CONTENT, ActionBar.LayoutParams.MATCH_PARENT, Gravity.CENTER);
TextView titleTV = (TextView) v.findViewById(R.id.title);
titleTV.setText("Test");

For Kotlin users:
Use the following code in your activity:
// Set custom action bar
supportActionBar?.displayOptions = ActionBar.DISPLAY_SHOW_CUSTOM
supportActionBar?.setCustomView(R.layout.action_bar)
// Set title for action bar
val title = findViewById<TextView>(R.id.titleTextView)
title.setText(resources.getText(R.string.app_name))
And the XML/ resource layout:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/titleTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Title"
android:textColor="#color/black"
android:textSize="18sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>

My solution will be to keep text part of tool bar separate, to define style and say, center or whichever alignment. It can be done in XML itself. Some paddings can be specified after doing calculations when you have actions that are visible always. I have moved two attributes from toolbar to its child TextView. This textView can be provided id to be accessed from fragments.
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/AppTheme.PopupOverlay" >
<!--android:theme="#style/defaultTitleTheme"
app:titleTextColor="#color/white"-->
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:paddingStart="#dimen/icon_size"
android:text="#string/title_home"
style="#style/defaultTitleTheme"
tools:ignore="RtlSymmetry" />
</androidx.appcompat.widget.Toolbar>
</com.google.android.material.appbar.AppBarLayout>
<FrameLayout
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>

Here's a quick tip to center align the action:
android:label=" YourTitle"
Assuming that you have Actionbar Enable, You can add this in your activity with some space (Can be adjusted) to place the title at the center.
However, This is just diddly and unreliable method. You probably shouldn't do that. So, The best thing to do is to create a custom ActionBar. So, What you wanna do is remove the default Actionbar and use this to replace it as an ActionBar.
<androidx.constraintlayout.widget.ConstraintLayout
android:elevation="30dp"
android:id="#+id/customAction"
android:layout_width="match_parent"
android:layout_height="56dp"
android:background="#color/colorOnMain"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/app_name"
android:textAllCaps="true"
android:textColor="#FFF"
android:textSize="18sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
I have used Constraint Layout to center the textView and used 10dp elevation with 56dp height so that it looks as same as the default ActionBar.

This code will not hide back button, Same time will align the title in centre.
call this method in oncreate
centerActionBarTitle();
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
myActionBar.setIcon(new ColorDrawable(Color.TRANSPARENT));
private void centerActionBarTitle() {
int titleId = 0;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
titleId = getResources().getIdentifier("action_bar_title", "id", "android");
} else {
// This is the id is from your app's generated R class when
// ActionBarActivity is used for SupportActionBar
titleId = R.id.action_bar_title;
}
// Final check for non-zero invalid id
if (titleId > 0) {
TextView titleTextView = (TextView) findViewById(titleId);
DisplayMetrics metrics = getResources().getDisplayMetrics();
// Fetch layout parameters of titleTextView
// (LinearLayout.LayoutParams : Info from HierarchyViewer)
LinearLayout.LayoutParams txvPars = (LayoutParams) titleTextView.getLayoutParams();
txvPars.gravity = Gravity.CENTER_HORIZONTAL;
txvPars.width = metrics.widthPixels;
titleTextView.setLayoutParams(txvPars);
titleTextView.setGravity(Gravity.CENTER);
}
}