Develop Reference

How to remove padding between upnavigation arrow and Toolbar Title?

Top is the default padding for the upnavigation arrow when you set
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
I would like the Toolbar to look more like the bottom image, as I want the title to indicate where the upnavigation arrow will send the user to rather than being a description of the current activity. So far I have tried adding a custom textview to the toolbar, and setting app:contentInsetStartWithNavigation="0dp" as per this similar question. But as the author notes, this doesn't remove the padding to the right of the arrow. How can I get the toolbar to look more like the second image? Current xml for my toolbar is as follows:
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar_doc"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="?attr/actionBarTheme"
app:contentInsetStartWithNavigation="0dp"
app:layout_constraintTop_toTopOf="parent">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:gravity="left"
android:id="#+id/txtTitle"
android:textColor="#FFFFFF"/>
</android.support.v7.widget.Toolbar>
I further provide the xml for the menu, which I add to the toolbar using the menu inflater. Another solution I was floating around was adding an arrow icon and textview to the menu itself? But then I'm not sure how I'd give the new arrow icon the same upnavigation behavior.
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
<item
android:id="#+id/navigation_home"
android:icon="#drawable/ic_baseline_home_24px"
app:showAsAction="always"/>
<item
android:id="#+id/action_settings"
android:orderInCategory="100"
android:title="#string/action_settings"
app:showAsAction="never" />
</menu>

Try setting app:contentInsetStart to 0dp instead of app:contentInsetStartWithNavigation.
<android.support.v7.widget.Toolbar
...
app:contentInsetStart="0dp">

Translucent status bar and toolbar

I'd like to integrate something like this:
And I've done it like this, but I can't seem to put the imageview below the toolbar. Without the toolbar, I can make it under the status bar, but combining these two are impossible.
Here's my layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
android:fitsSystemWindows="true"
tools:context="com.project.android.PhotoActivity">
<android.support.v7.widget.Toolbar
android:id="#+id/photo_tl"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#59000000"
tools:ignore="UnusedAttribute" />
<ImageView
android:id="#+id/photo_image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:scaleType="fitStart" />
</LinearLayout>
In my activity, I've done the following:
getWindow().getDecorView().setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
I've also declared an styles-v21.xml file:
<style name="Project.Photo" parent="Project.Light">
<item name="android:windowDrawsSystemBarBackgrounds">true</item>
<item name="android:statusBarColor">#59000000</item>
</style>
And set it as default style for PhotoActivity.
I've already tried putting the toolbar in a FrameLayout, but doing that my toolbar simply hides, like this:
Thanks in advance.
Got that fixed, but toolbar is overlapping the status bar. Is there anyway to fix the padding? If I use android:fitsSystemWindows="true", status bar isn't translucent anymore.

I would remove the Toolbar from your layout and use an implementation of an ActionBar from the AppCompat.Theme:
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
</style>
Then, I would create a new style for the semi-transparent ActionBar (in values/styles.xml:
<style name="AppTheme.Transparent" parent="AppTheme">
<item name="windowActionBarOverlay">true</item>
</style>
And in v21/styles.xml:
<style name="AppTheme.Transparent" parent="AppTheme">
<item name="windowActionBarOverlay">true</item>
<item name="android:windowTranslucentStatus">true</item>
</style>
I assume, that your Activity extends AppCompatActivity so then in onCreate() you can call:
For enabling a back button:
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
For setting your translucent color:
getSupportActionBar().setBackgroundDrawable(new ColorDrawable(ContextCompat.getColor(this, R.color.yourTranslucentColor)));
For removing your ActionBar title:
getSupportActionBar().setDisplayShowTitleEnabled(false);
What is more, I would change your root LinearLayout to CoordinatorLayout as it gives you more control over your layouts (it's a more powerful FrameLayout).
The color which I used is:
<color name="yourTranslucentColor">#29000000</color>
Of course you should remember to apply this theme to your Activity in the AndroidManifest.xml:
<activity
android:name=".ui.activity.YourActivity"
android:theme="#style/AppTheme.Transparent">
</activity>
By doing all these steps you should get something like this:
Please let me know, if it works for you.

As you said,
"I've already tried putting the toolbar in a FrameLayout, but doing that my toolbar simply hides, like this:".
The problem with this is the order of adding childView in FrameLayout, you added Toolbar as first child and after that you added ImageView. this is why image hides the toolbar. Instead, the order of views inside FameLayout should be like this
<FrameLayout
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:fitsSystemWindows="true"
tools:context="com.project.android.PhotoActivity">
<ImageView
android:id="#+id/photo_image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:scaleType="fitStart" />
<android.support.v7.widget.Toolbar
android:id="#+id/photo_tl"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#59000000"
tools:ignore="UnusedAttribute" />
</FrameLayout>
Also for API level >=19 ,you can add this attribute in style.xml file to make statusBar transparent
<item name="android:windowTranslucentStatus">true</item>
For making content behind statusBar use this link
https://developer.android.com/training/system-ui/status.html#behind

Use code below
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/coordinator_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="300dp"
android:fitsSystemWindows="true">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:contentScrim="#color/colorPrimary"
app:expandedTitleMarginEnd="64dp"
app:expandedTitleMarginStart="48dp"
app:expandedTitleTextAppearance="#style/AppTheme.CollapsingToolbarLayoutExpandedTextStyle"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<ImageView
android:id="#+id/iv_backdrop"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:scaleType="centerCrop"
app:layout_collapseMode="parallax" />
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?android:attr/actionBarSize"
android:theme="#style/YourTheme"
app:layout_collapseMode="pin" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<!-- Rest of your view-->
</android.support.design.widget.CoordinatorLayout>

LinearLayout will automatically place the ImageView below the Toolbar.
Try using a RelativeLayout instead.

Dont treat status bar as something separate from your app. Image is coming below the toolbar because you have used LinearLayout. Had you used RelativeLayout, your image would be starting at the same height as toolbar.
Now for making the statusbar transparent and for everything to start from under the statusbar use the following.
<style name="AppTheme.TranslucentStatusBar" >
<item name="android:windowTranslucentStatus">true</item>
<item name="android:windowBackground">#android:color/transparent</item>
</style>
Use the above style for your activity and everything starts from under the statusbar. Now for the toolbar, you can increase the height of the toolbar by adding the height of the statusbar as padding to toolbar. This can be done as follows:
toolbarContainer.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
Rect frame = new Rect();
getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
toolbarContainer.setPadding(0, frame.top, 0, 0);
}
});
You can set a color to statusbar and use the same color with AlphaTransparency on Toolbar.
getWindow().setStatusBarColor(ContextCompat.getColor(this, android.R.color.transparent));
Now you control everything including the statusbar and the toolbar.

Got that fixed, but toolbar is overlapping the status bar. Is there anyway to fix the padding? If I use android:fitsSystemWindows="true", status bar isn't translucent anymore.
I've recently written a post about WindowInsets, you may check it out. I think it would resolve your issue.
Long story short - what you have to do is to pass window insets only to Toolbar via ViewCompat.setOnApplyWindowInsetListener API. But the parent of your Toolbar should pass the window insets. In your case that won't happen, because by default LinearLayout and family layouts won't do that, you have to subclass and override onApplyWindowInsets method.
I suggest you to read the article, where everything is described more precisely.

TLDR; You have to wrap the toolbar in a LinearLayout.
What I did to make it work was similar to #Akhilesh Kumar's approach but I wrapped the toolbar in a LinearLayout which fixed the toolbar overlapping. I also put the fitsSystemWindows to true in that LinearLayout.
<FrameLayout
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:fitsSystemWindows="true"
tools:context="com.project.android.PhotoActivity">
<ImageView
android:id="#+id/photo_image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:scaleType="fitStart"/>
<LinearLayout
android:id="#+id/content_card_image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:fitsSystemWindows="true"
>
<android.support.v7.widget.Toolbar
android:id="#+id/photo_tl"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#59000000"
tools:ignore="UnusedAttribute"/>
</LinearLayout>
</FrameLayout>
I hope it helps.

just change the toolbar height to wrap_content:
<android.support.v7.widget.Toolbar
android:id="#+id/photo_tl"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#59000000"
tools:ignore="UnusedAttribute" />

Translucent/Transparent status bar + CoordinatorLayout + Toolbar + Fragment

I have following setup:
I'm using AppCompat
MainActivity, that holds a fragment and has a toolbar, that's hiding when scrolling down
Fragment with RecyclerView
all views that should fit the screen have the according android:fitsSystemWindows="true" in the xml layout
The problem is, I can't get the statusbar transparent in this case. What I do is following:
Create the activity and call setContent
Then I try to adjust the activity to programmatically get a translucent toolbar like following:
#TargetApi(Build.VERSION_CODES.LOLLIPOP)
public void themeNavAndStatusBar(Activity activity)
{
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP)
return;
Window w = activity.getWindow();
w.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
w.setFlags(
WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION,
WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
w.setFlags(
WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS,
WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
w.setNavigationBarColor(activity.getResources().getColor(android.R.color.transparent));
w.setStatusBarColor(activity.getResources().getColor(android.R.color.transparent));
}
Replace the placeholder in the activity (#+id/frame_container) with the fragment
The statusbar is solid colored in this case, and the views are not drawn underneath it... Why?
What I want
I want a toolbar, that is scrolled of the screen and hiding completely while the content underneath this toolbar should fitScreen and be drawn behind the transparent nav bar.
Layouts
Here's my main activity:
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/clMain"
android:fitsSystemWindows="true"
android:background="?attr/main_background_color"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:id="#+id/appBarLayout"
android:fitsSystemWindows="true"
android:background="#null"
app:elevation="0dp"
app:contentInsetLeft="0dp"
app:contentInsetStart="0dp"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:elevation="4dp"
android:theme="?actionBarThemeStyle"
app:popupTheme="?actionBarPopupThemeStyle"
app:layout_scrollFlags="scroll|enterAlways">
<LinearLayout
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/ivToolbarDataSource"
android:layout_gravity="center_vertical"
android:layout_marginRight="2dp"
android:layout_width="24dp"
android:layout_height="24dp" />
<TextView
android:id="#+id/tvToolbarTitle"
style="#style/TextAppearance.AppCompat.Widget.ActionBar.Title"
android:theme="?actionBarThemeStyle"
android:layout_gravity="center_vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
<TextView
android:id="#+id/tvToolbarSubTitle"
style="#style/TextAppearance.AppCompat.Widget.ActionBar.Subtitle"
android:theme="?actionBarThemeStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
</android.support.v7.widget.Toolbar>
<!-- BUG: http://stackoverflow.com/questions/30541409/coordinatorlayoutappbarlayout-does-not-draw-toolbar-properly -->
<View
android:layout_width="fill_parent"
android:layout_height="1dp"/>
</android.support.design.widget.AppBarLayout>
<FrameLayout
android:id="#+id/frame_container"
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|right"
android:layout_margin="32dp"
android:src="#drawable/ic_local_offer_white_24dp"
app:backgroundTint="?attr/colorPrimary"
app:borderWidth="0dp"
app:fabSize="normal"
app:rippleColor="?attr/colorPrimaryDark"
app:layout_anchorGravity="bottom|right|end"
app:layout_behavior="com.test.classes.ScrollAwareFABBehavior"/>
</android.support.design.widget.CoordinatorLayout>
And here is my fragment, that will be placed in the main activity:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.widget.SwipeRefreshLayout
android:id="#+id/srlImages"
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="#+id/rvImages"
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.v4.widget.SwipeRefreshLayout>
<TextView
android:id="#+id/tvEmpty"
android:gravity="center"
android:layout_centerInParent="true"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
EDIT - Screenshots
I use a light/dark base theme and theme everything by hand (because the user can select any color as primary/accent color), so don't mind that the toolbar is white (it's the default's theme background color and primary color). I added a black border as well so that you see where the activity ends...
First Screenshot: Shows the toolbar, nothing is scrolled
Second Screenshot: I just started scrolling => the toolbar now should scroll away
Third Screenshot: the main content should now scroll underneath the nav bar...
In the end, I'll of course make the toolbar and navbar semi transparent for a better visual effect...

tl;dr Set android:fitsSystemWindows="false" at least to the root CoordinatorLayout and to the inner fragment container, #frame_container.
This might not be the final solution (i.e. there might be other fitsSystemWindows to change) so tell me if you have any problems.
why
When it comes to status bar, I think of fitsSystemWindows like so:
fitsSystemWindows="false" : draws the view normally, under the status bar because of the window flags you have set.
fitsSystemWindows="true" : draws the view normally, under the status bar because of the window flags you have set, but adds a top padding so that content is drawn below the status bar and they don't overlap.
In fact, in my opinion, the white you see is not the status bar color, but rather your CoordinatorLayout background. That is due to fitsSystemWindows="true" on the coordinator: it draws the background to the whole window, but adds top padding to the content so inner views are not covered by status bar.
This is not what you want. Your inner content must be covered by the status bar, and so you have to set fitsSystemWindows="false" to the coordinator (so it won't apply top padding) and probably to the content itself.
Once you get how it works, it is easy to debug and achieve the effect you are looking for. Actually, it is not. Years pass, but I still spend hours trying to figure out the right fitsSystemWindows combination, because most Views (in the support libraries at least) override the default behavior that I stated above, in ways that are mostly not intuitive. See this post for a small guide on how to use it.

Edit your styles.xml (v21) , add the following style
<style name="AppTheme.Home" parent="AppTheme.Base">
<!-- Customize your theme here. -->
<item name="android:windowTranslucentStatus">true</item>
<item name="android:windowDrawsSystemBarBackgrounds">true</item>
<item name="android:windowTranslucentNavigation">true</item>
</style>
You can change parent theme as per your liking, but now declare this theme in your AndroidManifest.xml file for a particular activity like this :
<activity
android:theme="#style/AppTheme.Home"
android:name=".HomeActivity"
android:launchMode="singleTop"
android:screenOrientation="portrait" />
This will let your content visible under the transparent actionbar.
Now use the following to align your toolbar below the StatusBar properly, call this in your oncreate:
toolbar.setPadding(0, getStatusBarHeight(), 0, 0);
Get statusbar height using following :
public int getStatusBarHeight() {
int result = 0;
int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
if (resourceId > 0) {
result = getResources().getDimensionPixelSize(resourceId);
}
return result;
}
Remove the following from your coordinator layout tags :
android:fitsSystemWindows="true"
Now in order to collapse your toolbar or hide it you may refer to this tutorial
Make sure you are using following version of design support library, as it is bug free :
compile 'com.android.support:design:23.1.0'

After reading your descriptions about your question, I thought styles of Google Photos matches your requirement.
OK, there are just some tips for your question. After my test, it works.
If you want to show content behind status bar, you need add <item name="android:windowTranslucentStatus">true</item> into your
style when Android version level is larger than 19(namely KitKat)
If you want to show content behind navigation bar, you need add
<item name="android:windowTranslucentNavigation">true</item> into your
style when Android version level is larger than 19(namely KitKat)
If you want to hide Toolbar smoothly when content is scrolled up
and to show Toolbar smoothly when content is scrolled down, you
need to add app:layout_collapseMode="parallax" into your
Toolbar's attributes based on your current codes.Of course, you
need coordinate Toolbar with CollapsingToolbarLayout
CoordinatorLayout and AppBarLayout.

as some users said, by setting android:fitsSystemWindows="false", the layout overlapped below statusbar.
I solved it by setting android:fitsSystemWindows="true" and in CoordinatorLayout tag setting app:statusBarBackground="#android:color/transparent".

For me, the reason was not that it did not work per se, but that I use the material drawer library from Mike Penz and this library does use fullscreen + offset + custom background behind the toolbar so I had to solve the problem respecting that special setup...
I'll reward the points to the in my opinion most informative answer though...

I had the same issue and my solution was add android:fitsSystemWindows="true" to the DrawerLayout
<android.support.v4.widget.DrawerLayout 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/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
....
</android.support.v4.widget.DrawerLayout>

I had relevant issues depend on android:fitsSystemWindows setting.
Once false:
Snacks was drawn under the Navigation bar
Once true:
Status bar had none transparent background
Solution was really simple...
Just to add android:layout_marginBottom="48dp". to CoordinatorLayout like that:
just to add <android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:map="http://schemas.android.com/apk/res-auto"
tools:context=".MapsActivity"
android:id="#+id/coordinatorLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="false"
android:layout_marginBottom="48dp">
Theoretically Navigation bar should have fixed size "48dp", but in future releases potentially it may change (like Status bar got slimmer by 1dp in Marshmallow), so I wouldn't rely on fixed size.
Better additionally get it and apply on run time.
If You are using Google Map like me You may want to know ActionBar/Toolbar size and the navigation bar in run time:
in onCreate use this code:
final TypedArray styledAttributes = MapsActivity.this.getTheme().obtainStyledAttributes(
new int[]{android.R.attr.actionBarSize});
mToolbarHeight = (int) styledAttributes.getDimension(0, 0);
styledAttributes.recycle();
// translucent bars code. Will not fire below Lollipop
// Ask NavigationBar Height
ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.coordinatorLayout),
new OnApplyWindowInsetsListener() { // setContentView() must be fired already
#Override
public WindowInsetsCompat onApplyWindowInsets(View v, WindowInsetsCompat insets) {
statusBar = insets.getSystemWindowInsetTop(); // You may also need this value
mNavBarHeight = insets.getSystemWindowInsetBottom();
if (mMap != null)
mMap.setPadding(0, mToolbarHeight, 0, mNavBarHeight);
// else will be set in onMapReady()
SharedPreferences.Editor editor = mSharedPref.edit();
editor
.putInt(NAVBAR_HEIGHT_KEY, mNavBarHeight)
.commit(); // Save the results in flash memory and run the code just once on app first run instead of doing it every run
return insets;
}
}
);
And what's important. If You got some additional layers like drawer etc put them encapsulating the CoordinatorLayout inside rather than outside as otherwise it will make other views inside shorter by the marginBottom

Here's what I did to have the toolbar have the same color as the status bar, by getting the status bar transparent:
build.gradle
...
implementation 'androidx.core:core-ktx:1.2.0'
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'com.google.android.material:material:1.1.0'
**ScrollingActivity.kt**
```kt
class ScrollingActivity : AppCompatActivity(R.layout.activity_scrolling) {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setSupportActionBar(toolbar)
}
}
activity_scrolling.xml
<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"
tools:context=".ScrollingActivity">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/app_bar" android:layout_width="match_parent" android:layout_height="wrap_content"
android:background="#f00" android:fitsSystemWindows="true" android:theme="#style/AppTheme.AppBarOverlay">
<com.google.android.material.appbar.MaterialToolbar
android:id="#+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize"
app:popupTheme="#style/AppTheme.PopupOverlay" />
</com.google.android.material.appbar.AppBarLayout>
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent" android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<TextView
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_margin="#dimen/text_margin" android:text="#string/large_text" />
</androidx.core.widget.NestedScrollView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
styles.xml
<resources>
<style name="AppTheme" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
</style>
<style name="AppTheme.NoActionBar">
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
<item name="android:statusBarColor">#android:color/transparent</item>
</style>
<style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />
<style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />
</resources>
manifest
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.lb.myapplication">
<application
android:allowBackup="true" android:icon="#mipmap/ic_launcher" android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="#style/AppTheme">
<activity
android:name=".ScrollingActivity" android:label="#string/app_name"
android:theme="#style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

You should add the following code to your theme, this code will make the status bar transparent:
<item name="android:windowTranslucentStatus" tools:targetApi="kitkat">true</item>
Additionally, add scroll behavior to your top app bar. The following example shows the top app bar disappearing upon scrolling up, and appearing upon scrolling down:
<androidx.coordinatorlayout.widget.CoordinatorLayout
...>
<com.google.android.material.appbar.AppBarLayout
...>
<com.google.android.material.appbar.MaterialToolbar
...
app:layout_scrollFlags="scroll|enterAlways|snap"
/>
</com.google.android.material.appbar.AppBarLayout>
...
</androidx.coordinatorlayout.widget.CoordinatorLayout>

First add this code to AppBarLayout:
app:liftOnScroll="true"
Then update your "app:layout_scrollFlags" in your toolbar:
app:layout_scrollFlags="scroll|enterAlways|snap"
This will work, I am pretty sure.

Set elevation to View automatically the elevation of the Toolbar, how to change this?

I'm using a theme that will not show the ActionBar by default:
<style name="AppTheme" parent="Theme.AppCompat">
<item name="windowActionBar">false</item>
<item name="android:textColorPrimary">#FFFFFF</item>
</style>
However, I'm replacing it with Toolbar in xml:
<LinearLayout 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:orientation="vertical"
... >
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar_VenueDetail"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#color/MainColor" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="300dp"
android:background="#color/MainColor"
android:elevation="#dimen/default_elevation"
android:orientation="vertical">
</LinearLayout>
</LinearLayout>
in OnCreate:
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar_VenueDetail);
setSupportActionBar(toolbar);
The expected result is a flat Toolbar and a shadow below the LinearLayout, which is exactly what preview in Android Studio shows me:
However in real life, the Toolbar has also taken effect:
I want to just put the shadow below another View and keep my Toolbar flat, how to achieve this? Is this even possible?

Do not set the toolbar as a support actionbar. You can still set navigation button, title and inflate menu on the toolbar but the elevation shouldn't be applied unless you set it explicitly in code or in the activity layout.
Having said that, make sure that the removing the elevation is not against the principles of material design.

Padding between ActionBar's home icon and title

Does anybody know how to set padding between the ActionBar's home icon and the title?

EDIT: make sure you set this drawable as LOGO, not as your app icon like some of the commenters did.
Just make an XML drawable and put it in the resource folder "drawable" (without any density or other configuration).
<?xml version="1.0" encoding="utf-8"?>
<layer-list
xmlns:android="http://schemas.android.com/apk/res/android" >
<item
android:drawable="#drawable/my_logo"
android:right="10dp"/>
</layer-list>
The last step is to set this new drawable as logo in your manifest (or on the Actionbar object in your activity)
Good luck!

I adapted Cliffus answer and assigned the logo-drawable in my actionbar style definition, for instance like this in res/style.xml:
<item name="android:actionBarStyle">#style/MyActionBar</item>
<style name="MyActionBar" parent="#android:style/Widget.Holo.Light.ActionBar">
<item name="android:background">#3f51b5</item>
<item name="android:titleTextStyle">#style/ActionBar.TitleText</item>
<item name="android:textColor">#fff</item>
<item name="android:textSize">18sp</item>
<item name="android:logo">#drawable/actionbar_space_between_icon_and_title</item>
</style>
The drawable looks like Cliffus' one (here with the default app launcher icon) in res/drawable/actionbar_space_between_icon_and_title.xml:
<?xml version="1.0" encoding="utf-8"?>
<layer-list
xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:drawable="#drawable/ic_launcher"
android:right="20dp"/>
</layer-list>
In the android_manifest.xml you can still set a different app icon (launcher icon on 'desktop'. Any different logo definition here are visible in activities without an action bar.

I also faced a similar issue, in my case I had to set titles dynamically on each activity depending on the content.
So this worked for me.
actionBar.setTitle(" " + yourActivityTitle);
If all you want is the spacing, this is the easiest solution I could think of.

This is how I was able to set the padding between the home icon and the title.
ImageView view = (ImageView)findViewById(android.R.id.home);
view.setPadding(left, top, right, bottom);
I couldn't find a way to customize this via the ActionBar xml styles though. That is, the following XML doesn't work:
<style name="ActionBar" parent="android:style/Widget.Holo.Light.ActionBar">
<item name="android:titleTextStyle">#style/ActionBarTitle</item>
<item name="android:icon">#drawable/ic_action_home</item>
</style>
<style name="ActionBarTitle" parent="android:style/TextAppearance.Holo.Widget.ActionBar.Title">
<item name="android:textSize">18sp</item>
<item name="android:paddingLeft">12dp</item> <!-- Can't get this padding to work :( -->
</style>
However, if you are looking to achieve this through xml, these two links might help you find a solution:
https://github.com/android/platform_frameworks_base/blob/master/core/res/res/values/styles.xml
(This is the actual layout used to display the home icon in an action bar)
https://github.com/android/platform_frameworks_base/blob/master/core/res/res/layout/action_bar_home.xml

This is a common question in Material Design as you may want to line your toolbars title with the content in the fragment below. To do this, you can override the default padding of "12dp" by using the attribute contentInsetStart="72dp" in your toolbar.xml layout as shown below
toolbar.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/app_theme_color"
app:contentInsetStart="72dp"/>
Then in your activity, call
Toolbar toolbar = (Toolbar) activity.findViewById(R.id.toolbar);
toolbar.setTitle("Title Goes Here");
And you end up with this:

If you are using toolbar from AppCompat (android.support.v7.widget.Toolbar, >= revision 24, June 2016), the padding between the icon and the title can be changed with the following value :
app:contentInsetStartWithNavigation="0dp"
To improve my answer, you can use it on your toolbar directly inside your activity or you can create a new layout file for your toolbar. In this case, you just have to import your toolbar's #id using the include property on each needed views.
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:elevation="4dp"
app:contentInsetLeft="0dp"
app:contentInsetStart="0dp"
app:contentInsetStartWithNavigation="0dp">
</android.support.v7.widget.Toolbar>
You can then import your layout on your activity.xml
<include
layout="#layout/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>

For me only the following combination worked, tested from API 18 to 24
app:contentInsetLeft="0dp"
app:contentInsetStart="0dp"
app:contentInsetStartWithNavigation="0dp"
where in "app" is : xmlns:app="http://schemas.android.com/apk/res-auto"
for example.
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#color/SE_Life_Green"
app:contentInsetLeft="0dp"
app:contentInsetStart="0dp"
app:contentInsetStartWithNavigation="0dp"
>
.......
.......
.......
</android.support.v7.widget.Toolbar>

Using titleMarginStart works for me. Xamarin example:
<android.support.v7.widget.Toolbar
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/toolbar"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:minHeight="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:titleMarginStart="24dp"/>
Set the logo like so:
mToolbar = FindViewById<SupportToolbar>(Resource.Id.toolbar);
SetSupportActionBar(mToolbar);
SupportActionBar.SetLogo(Resource.Drawable.titleicon32x32);
SupportActionBar.SetDisplayShowHomeEnabled(true);
SupportActionBar.SetDisplayUseLogoEnabled(true);
SupportActionBar.Title = "App title";

I used \t before the title and worked for me.

Im using a custom image instead of the default title text to the right of my apps logo. This is set up programatically like
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setDisplayUseLogoEnabled(true);
actionBar.setCustomView(R.layout.include_ab_txt_logo);
actionBar.setDisplayShowCustomEnabled(true);
The issues with the above answers for me are #Cliffus's suggestion does not work for me due to the issues others have outlined in the comments and while #dushyanth programatic padding setting may have worked in the past I would think that the fact that the spacing is now set using android:layout_marginEnd="8dip" since API 17 manually setting the padding should have no effect. See the link he posted to git to verify its current state.
A simple solution for me is to set a negative margin on my custom view in the actionBar, like so android:layout_marginLeft="-14dp". A quick test shows it works for me on 2.3.3 and 4.3 using ActionBarCompat
Hope this helps someone!

I solved this problem by using custom Navigation layout
Using it you can customize anything in title on action bar:
build.gradle
dependencies {
compile 'com.android.support:appcompat-v7:21.0.+'
...
}
AndroidManifest.xml
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name">
<activity
android:name=".MainActivity"
android:theme="#style/ThemeName">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
styles.xml
<style name="ThemeName" parent="Theme.AppCompat.Light">
<item name="actionBarStyle">#style/ActionBar</item>
<item name="android:actionBarStyle" tools:ignore="NewApi">#style/ActionBar</item>
<style name="ActionBar" parent="Widget.AppCompat.ActionBar">
<item name="displayOptions">showCustom</item>
<item name="android:displayOptions" tools:ignore="NewApi">showCustom</item>
<item name="customNavigationLayout">#layout/action_bar</item>
<item name="android:customNavigationLayout" tools:ignore="NewApi">#layout/action_bar</item>
<item name="background">#color/android:white</item>
<item name="android:background">#color/android:white</item>
action_bar.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/action_bar_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:drawableLeft="#drawable/ic_launcher"
android:drawablePadding="10dp"
android:textSize="20sp"
android:textColor="#android:color/black"
android:text="#string/app_name"/>

I had a similar issue but with spacing between the up and the custom app icon/logo in the action bar. Dushyanth's solution of setting padding programatically worked for me (setting padding on app/logo icon). I tried to find either android.R.id.home or R.id.abs__home (ActionBarSherlock only, as this ensures backwards compatibility), and it seems to work across 2.3-4.3 devices I've tested on.

For my case, it was with Toolbar i resolved it like this:
ic_toolbar_drawble.xml
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:drawable="#drawable/ic_toolbar"
android:right="-16dp"
android:left="-16dp"/>
</layer-list>
In my Fragment, i check the api :
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
toolbar.setLogo(R.drawable.ic_toolbar);
else
toolbar.setLogo(R.drawable.ic_toolbar_draweble);
Good luck!

You can change drawableSize of your DrawerArrow like this:
<style name="MyTheme" parent="android:Theme.WithActionBar">
<item name="drawerArrowStyle">#style/DrawerArrowStyle</item>
</style>
<style name="DrawerArrowStyle" parent="Widget.AppCompat.DrawerArrowToggle">
<item name="barLength">24dp</item>
<item name="arrowShaftLength">24dp</item>
<item name="arrowHeadLength">10dp</item>
<item name="drawableSize">42dp</item> //this is your answer
</style>
It isn't correct answer, because you can't choose padding side and DrawerArrow icon scaling when change drawableSize (drawableSize = width = height). But you can margin from left. To margin from right do
findViewById(android.R.id.home).setPadding(10, 0, 5, 0);

I used this method setContentInsetsAbsolute(int contentInsetLeft, int contentInsetRight) and it works!
int padding = getResources().getDimensionPixelSize(R.dimen.toolbar_content_insets);
mToolbar.setContentInsetsAbsolute(padding, 0);

When you are using a custom Toolbar, you can use
toolbar = (Toolbar) findViewById(R.id.toolbar);
toolbar.setTitle(R.string.activity_title);
setSupportActionBar(toolbar);
getSupportActionBar().setLogo(R.drawable.logo);
and in your toolbar layout simply set app:titleMarginStart="16dp"
Note that you have to set the icon as a logo, don't use getSupportActionBar().setIcon(R.drawable.logo)
instead use:
getSupportActionBar().setLogo(R.drawable.logo)

I used AppBarLayout and custom ImageButton do to so.
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:elevation="0dp"
android:background="#android:color/transparent"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="32dp"
android:layout_height="32dp"
android:src="#drawable/selector_back_button"
android:layout_centerVertical="true"
android:layout_marginLeft="8dp"
android:id="#+id/back_button"/>
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"/>
</RelativeLayout>
</android.support.design.widget.AppBarLayout>
My Java code:
findViewById(R.id.appbar).bringToFront();
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
final ActionBar ab = getSupportActionBar();
getSupportActionBar().setDisplayShowTitleEnabled(false);

You can achieve same by method as well:
Drawable d = new InsetDrawable(getDrawable(R.drawable.nav_icon),0,0,10,0);
mToolbar.setLogo(d);

In your XML, set the app:titleMargin in your Toolbar view as following:
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:titleMarginStart="16dp"/>
Or in your code:
toolbar.setTitleMargin(16,16,16,16); // start, top, end, bottom

Just include:
app:titleMargin="10dp"
Within your xml file, like:
<androidx.appcompat.widget.Toolbar
android:id="#+id/tbrMain"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:titleMargin="10dp"
android:minHeight="?attr/actionBarSize"
android:theme="?attr/actionBarTheme" />

this work for me to add padding to the title and for ActionBar icon i have set that programmatically.
getActionBar().setTitle(Html.fromHtml("<font color='#fffff'> Boat App </font>"));

<string name="app_name">" "Brick Industry</string>
Just add " " for your app name
It will add space between icon and title