I've created a new blank project in Android Studio. Once loaded I right clicked on the com.myapp.appname folder and selected Activity > Blank Activity. But, the activity still seems to have the title bar, as can be seen in the image below.
I attempted to add android:theme="#android:style/Theme.NoTitleBar" to the manifest but it doesn't seem to work. The error I am getting is:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.newapp.jamesjeffery/com.newapp.jamesjeffery.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
My manifest is:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.newapp.jamesjeffery">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/Theme.AppCompat.Light">
<activity
android:name=".MainActivity"
android:label="#string/title_activity_main"
android:theme="#android:style/Theme.NoTitleBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Main Activity:
package com.newapp.jamesjeffery;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
}
content_main.xml
<?xml version="1.0" encoding="utf-8"?>
<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:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="com.newapp.jamesjeffery.MainActivity"
tools:showIn="#layout/activity_main">
</RelativeLayout>
I've tried to follow this: You need to use a Theme.AppCompat theme (or descendant) with this activity ... but to no avail.
I am trying to create a blank activity with no title bar.
Any ideas where I am going wrong?
Try extending your activity style from Theme.AppCompat.NoActionBar. e.g
<style name="AppTheme" parent="Theme.AppCompat.NoActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
</style>
Try this :
Add this style to your styles.xml if it doesn't already exists :
<style name="AppTheme.NoActionBar">
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
</style>
and in your v21/styles.xml :
<style name="AppTheme.NoActionBar">
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
<item name="android:windowDrawsSystemBarBackgrounds">true</item>
<item name="android:statusBarColor">#android:color/transparent</item>
</style>
and set the style this way
android:theme="#android:style/AppTheme.NoActionBar"
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
Remove Toolbar from your activity_main.xml
Your problem is
You need to use a Theme.AppCompat theme (or descendant) with this
activity.
To solve this issue you must to create a custom descendant theme of Theme.AppCompat like this
<style name="Theme.AppCompat.NoActionBar" parent="#style/Theme.AppCompat">
<item name="windowNoTitle">true</item>
<item name="windowActionBar">false</item>
</style>
And change in your AndroidManifest.xml the MainActivity theme:
<activity
android:name=".MainActivity"
android:label="#string/title_activity_main"
android:theme="#style/Theme.AppCompat.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
Hope this helps!!
Related
I get this error even though I use the AppCompat theme.
Everything was working fine, and after changing some fragment class lines, it started popping this error.
I tried to undo all last changes to get back on the last working state but the error is still here.
I now that there is a lot of posts with this problem, but something else is wrong here.
What else could be a problem?
MainActivity.java
package com.example.currencyconverter;
import androidx.appcompat.app.AppCompatActivity;
import androidx.viewpager.widget.PagerAdapter;
import androidx.viewpager.widget.ViewPager;
import android.os.Bundle;
import com.google.android.material.tabs.TabLayout;
public class MainActivity extends AppCompatActivity {
private ViewPager mViewPager;
private TabLayout mTabLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initViews();
setUpPager();
}
private void initViews(){
mViewPager = findViewById(R.id.viewPager);
mTabLayout = findViewById(R.id.tab);
}
private void setUpPager(){
PagerAdapter pagerAdapter = new ScreenSlidePagerAdapter(getSupportFragmentManager());
mViewPager.setAdapter(pagerAdapter);
mTabLayout.setupWithViewPager(mViewPager);
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.currencyconverter">
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="#drawable/icon"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme"
tools:ignore="GoogleAppIndexingWarning">
<activity android:name=".MainActivity"
android:configChanges="orientation"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
styles.xml
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.DayNight.NoActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
</style>
<style name="MatchSpinnerStyle" parent="android:style/Widget.ListView.DropDown">
<item name="android:divider">#123456</item>
<item name="android:dividerHeight">1dp</item>
</style>
<style name="MatchSpinnerTheme" parent="AppTheme">
<item name="android:dropDownListViewStyle">#style/MatchSpinnerStyle</item>
</style>
<style name="MineCustomTabText" parent="TextAppearance.Design.Tab">
<item name="android:textSize">20sp</item>
</style>
</resources>
My AndroidManifest.xml code is as follows :
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.chintan.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=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
My MainActivity.java code is as follows:
package com.example.chintan.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
And my app looks something like this.. I want the "Armour" to be written at the top of the screen just below the notification bar.
App looks like this
1- create a FullScreenTheme inside styles.xml
<style name="FullScreenTheme" parent="your parent them"> // for example use this parent them --> Theme.AppCompat.Light.DarkActionBar
<item name="windowNoTitle">true</item>
<item name="android:windowFullscreen">true</item>
</style>
2- add the theme in the menefist
<activity
android:name=".MainActivity"
android:theme="#style/FullScreenTheme">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
You could try something like this:
// Make fullscreen
int UI_OPTIONS = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION;
getWindow().getDecorView().setSystemUiVisibility(UI_OPTIONS);
I use it to make my apps fullscreen and it works really well. It hides the nav bar and will only appear when you swipe upwards near the bottom of your device's screen
Use this simple function and get rid of all problems
public void setFullscreen(boolean fullscreen) {
WindowManager.LayoutParams attrs = getWindow().getAttributes();
if (fullscreen) {
attrs.flags |= WindowManager.LayoutParams.FLAG_FULLSCREEN;
AdHelper.bannerAd.setVisibility(View.GONE);
} else {
attrs.flags &= ~WindowManager.LayoutParams.FLAG_FULLSCREEN;
if (AdHelper.isBannerLoaded)
AdHelper.bannerAd.setVisibility(View.VISIBLE);
}
getWindow().setAttributes(attrs);
}
Just Pass the parameters to true for fullscreen and false for exit fullscreen. That's it.
Change your AppTheme as following
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
<item name="android:windowFullscreen">true</item>
</style>
As I can see your app image you did not remove actionbar from your app theme.
Use Theme.AppCompat.Light.NoActionBar theme for not action bar. Then if you want action bar in any activity of your app then use ToolBar .
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<!-- Customize your theme here. -->
<item name="android:windowIsTranslucent">true</item>
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
</style>
Hope this will help you.
When I launch the apps in Emulator, I realize the Navigation bar which shows apps name is missing. May I know what's going on?
public class MainActivity extends Activity implements OnClickListener {
EditText first_name;
EditText last_name;
Button button_submit;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
first_name = (EditText) findViewById(R.id.first_name);
last_name = (EditText) findViewById(R.id.last_name);
button_submit = (Button) findViewById(R.id.button_submit);
button_submit.setOnClickListener(this);
}
#Override
public void onClick(View v) {
Intent intent = new Intent(this, ViewActivity.class);
intent.putExtra("first_name", first_name.getText().toString());
intent.putExtra("last_name", last_name.getText().toString());
startActivity(intent);
}
}
Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.yuqk.intent_usage">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".ViewActivity"></activity>
</application>
Style.xml
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
</style>
Please refer the the screenshot for reference.. Thanks!
Probably you have
android:theme="#style/AppTheme.NoActionBar"
in your AndroidManifest.xml. If so, you need to change it to
android:theme="#style/AppTheme"
(assuming you have AppTheme defined in styles.xml with parent parent="Theme.AppCompat.Light.DarkActionBar" or similar).
Check this if you add toolbar in xml file like this
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.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.support.design.widget.AppBarLayout>
then add this code to your MainActivity.java file.
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
and in Manifest.xml you have use this theme.
android:theme="#style/AppTheme.NoActionBar"
styles.xml you have this
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<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>
</style>
If you have toolbar included in your xml, add this line of code inside of onCreate() method, right after setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
There is an option in the Layout editor named 'Show layout decorations'
You must have this option turned off.
There is a button with the image of an eye above the mobile screen in android studio. Click on that and a drop down menu should be seen. Check the 'Show Layout Decorations' and your problem should be solved.
It might that you have changed Style.xml file with theme style of NoActionBar
please change it to
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
and then Run
Below is the code and I could not found solutions for displaying icon.I found difficulty to display icon for ActionBar in Android VS 1.5 with SDK 21.0.
Below is the code and I could not found solutions for displaying icon.
style.xml
<resources>
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<item name="android:actionBarStyle">#style/ActionBar</item>
<item name="actionBarStyle">#style/ActionBar</item>
</style>
<style name="ActionBar" parent="Widget.AppCompat.Light.ActionBar.Solid.Inverse">
<item name="android:background">#color/red</item>
<item name="background">#color/red</item>
<item name="android:icon">#mipmap/ic_launcher</item>
<item name="icon">#mipmap/ic_launcher</item>
</style>
</resources>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.saisunsolutions.ifinco">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".splaseActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
splashActivity.java
package com.saisunsolutions.ifinco;
import android.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.style.TypefaceSpan;
public class splaseActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splase);
}
}
you should create android resource directory with menu name then inside menu create action_bar.xml like this
<item
android:id="#+id/action_bar_refresh"
android:icon="#drawable/ic_refresh"
app:showAsAction="always"
android:title="test"/>
then in your activity override onCreateOptionMenu like below
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.action_bar,menu);
return super.onCreateOptionsMenu(menu);
}
The used theme for the actionbar is Theme.AppCompat.Light when using Theme.Holo the issue does not exists.
I am using a custom view for the support v7 actionbar:
<?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:background="#android:color/white" >
</LinearLayout>
And I get the following result :
How do I remove the black line/divider between the layout and the actionbar.
I have tried changing the actionbar style but with not much of a success.
<resources>
<style name="Theme.Styled" parent="#style/Theme.AppCompat.Light">
<!-- Setting values in the android namespace affects API levels 14+ -->
<item name="android:actionBarStyle">#style/Widget.Styled.ActionBar</item>
</style>
<style name="Widget.Styled.ActionBar" parent="#style/Widget.AppCompat.Light.ActionBar">
<item name="dividerVertical">#null</item>
<item name="android:background">#null</item>
<item name="android:paddingTop">0dp</item>
<item name="android:paddingBottom">0dp</item>
<item name="android:showDividers">none</item>
<item name="android:background">#null</item>
<item name="android:divider">#null</item>
<item name="android:dividerHeight">0dp</item>
<item name="android:dividerPadding">0dp</item>
</style>
</resources>
Here is my Activity Source:
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayShowTitleEnabled(false);
actionBar.setDisplayShowHomeEnabled(false);
actionBar.setDisplayShowCustomEnabled(true);
actionBar.setCustomView(R.layout.actionbar);
actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
}
}
This is the manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.actionbartest"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/Theme.Styled" >
<activity
android:name="com.example.actionbartest.MainActivity"
android:label="#string/app_name"
>
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
You're probably looking for the android:windowContentOverlay attribute.
To remove that drop shadow, simply set the value to #null in your theme, like so:
<style name="Theme.Styled" parent="#style/Theme.AppCompat.Light">
<!-- Setting values in the android namespace affects API levels 14+ -->
<item name="android:actionBarStyle">#style/Widget.Styled.ActionBar</item>
<item name="android:windowContentOverlay">#null</item>
</style>
How do I remove the black line/divider between the layout and the actionbar.
I think you are mistaken. There really isn't a divider present. To confirm:
Open the layout file you're using with setContentView(R.layout.activity_main). Whatever the base container is, set its background to the color you use with the ActionBar. For example, let's say that the base container is a LinearLayout:
<?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:background="#android:color/white" > <<<====== Add this
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />
</LinearLayout>
You'll see that the ActionBar now blends with the activity's view.
What you are currently seeing is a gradient defined as:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<gradient
android:startColor="#ffe8e8e8"
android:endColor="#ffffffff"
android:angle="270" />
</shape>
Here's where the background comes from:
(taken from platforms/android-17/data/res/values/themes.xml)
<style name="Theme.Light">
<item name="windowBackground">#android:drawable/screen_background_selector_light</item>
....
To get rid of it, you can either give your base container a background color, or override this attribute's value in your project's res/values/themes.xml:
<style name="AppBaseTheme" parent="android:Theme.Holo.Light">
</style>
<!-- Application theme. -->
<style name="AppTheme" parent="AppBaseTheme">
<item name="android:windowBackground">#android:color/white</item>
</style>
Edit:
This is the project setup:
res/layout/activity_main.xml:
<RelativeLayout 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:background="#android:color/white"
tools:context=".MainActivityCompat" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello_world" />
</RelativeLayout>
res/values/styles.xml
<resources>
<style name="AppBaseTheme" parent="#style/Theme.AppCompat.Light">
</style>
<!-- Application theme. -->
<style name="AppTheme" parent="AppBaseTheme">
</style>
</resources>
AndroidManifest.xml:
<uses-sdk
android:minSdkVersion="7"
android:targetSdkVersion="14" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.trialcompat.MainActivityCompat"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
MainActivityCompat.java:
import android.os.Bundle;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
public class MainActivityCompat extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayShowTitleEnabled(false);
actionBar.setDisplayShowHomeEnabled(false);
actionBar.setDisplayShowCustomEnabled(true);
actionBar.setCustomView(R.layout.actionbar);
actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
}
}
R.layout.actionbar is the same as the one you have posted in the question. And this is the result:
As you can see, I cannot reproduce the divider issue. Am I missing something here?
Beside #Vikram answer, add this to the theme:
<item name="android:windowContentOverlay">#android:color/white</item>
Recommendation: Use the same color you use on your layouts. For the default one, use #null
Hope this helps.
I had the same issue. After lots of trials and fails I found that the bug was because of the 9patch background of the action bar.
I switched the 9patch with a regular image and the black line was gone.
For api version >= 21
AppBarLayout appBarLayout = findViewById(R.id.app_bar_layout);
appBarLayout.setOutlineProvider(null);