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statusbar – Android Completely transparent Status Bar?

Posted by: admin March 10, 2020 Leave a comment

Questions:

I’ve searched the documentation but only found this:
Link. Which is used to make the bar translucent? What I’m trying to do is to make the status bar completely transparent (as shown in the image below) and make it backwards compatible for APK<19:
enter image description here

My styles.xml:

<resources xmlns:tools="http://schemas.android.com/tools">

  <style name="AppTheme" parent="Theme.AppCompat.Light">
  <item name="android:actionBarStyle">@style/ThemeActionBar</item>
  <item name="android:windowActionBarOverlay">true</item>
  <!-- Support library compatibility -->
  <item name="actionBarStyle">@style/ThemeActionBar</item>
  <item name="windowActionBarOverlay">true</item>
  </style>

  <style name="ThemeActionBar" parent="Widget.AppCompat.Light.ActionBar.Solid">
  <item name="android:background"> @null </item>
  <!-- Support library compatibility -->
  <item name="background">@null</item>
  <item name="android:displayOptions"> showHome | useLogo</item>
  <item name="displayOptions">showHome|useLogo</item>

  </style>

</resources>

What I was able to do:

enter image description here

How to&Answers:

All you need to do is set these properties in your theme:

<item name="android:windowTranslucentStatus">true</item>
<item name="android:windowTranslucentNavigation">true</item>

Your activity / container layout you wish to have a transparent status bar needs this property set:

android:fitsSystemWindows="true"

It is generally not possible to perform this for sure on pre-kitkat, looks like you can do it but some strange code makes it so.

EDIT: I would recommend this lib: https://github.com/jgilfelt/SystemBarTint for lots of pre-lollipop status bar color control.

Well after much deliberation I’ve learned that the answer to totally disabling the translucency or any color placed on the status bar and navigation bar for lollipop is to set this flag on the window:

// In Activity's onCreate() for instance
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
    Window w = getWindow();
    w.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS, WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
}

No other theme-ing is necessary, it produces something like this:

enter image description here

Answer:

Just add this line of code to your main java file:

getWindow().setFlags(
    WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS,
    WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS
);

Answer:

You can use the external library StatusBarUtil:

Add to your module level build.gradle:

compile 'com.jaeger.statusbarutil:library:1.4.0'

Then you can use the following util for an Activity to make the status bar transparent:

StatusBarUtil.setTransparent(Activity activity)

Example:

transparent status bar on Lollipop and KitKat

Answer:

Works for Android KitKat and above (For those who want to transparent the status bar and don’t manipulate the NavigationBar, because all of these answers will transparent the NavigationBar too!)

The easiest way to achieve it:

Put these 3 lines of code in the styles.xml (v19) -> if you don’t know how to have this (v19), just write them in your default styles.xml and then use alt+enter to automatically create it:

<item name="android:windowFullscreen">false</item>
<item name="android:windowContentOverlay">@null</item>
<item name="android:fitsSystemWindows">false</item>

And now, go to your MainActivity Class and put this Method out of onCreate in the class:

public static void setWindowFlag(Activity activity, final int bits, boolean on) {

    Window win = activity.getWindow();
    WindowManager.LayoutParams winParams = win.getAttributes();
    if (on) {
        winParams.flags |= bits;
    } else {
        winParams.flags &= ~bits;
    }
    win.setAttributes(winParams);
}

Then put this code in the onCreate method of the Activity:

if (Build.VERSION.SDK_INT >= 19 && Build.VERSION.SDK_INT < 21) {
        setWindowFlag(this, WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS, true);
    }
    if (Build.VERSION.SDK_INT >= 19) {
        getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
    }
    //make fully Android Transparent Status bar
    if (Build.VERSION.SDK_INT >= 21) {
        setWindowFlag(this, WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS, false);
        getWindow().setStatusBarColor(Color.TRANSPARENT);
    }

That’s it!

Answer:

Completely Transparent StatusBar and NavigationBar

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    transparentStatusAndNavigation();
}


private void transparentStatusAndNavigation() {
    //make full transparent statusBar
    if (Build.VERSION.SDK_INT >= 19 && Build.VERSION.SDK_INT < 21) {
        setWindowFlag(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS
                | WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION, true);
    }
    if (Build.VERSION.SDK_INT >= 19) {
        getWindow().getDecorView().setSystemUiVisibility(
                View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                        | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                        | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
        );
    }
    if (Build.VERSION.SDK_INT >= 21) {
        setWindowFlag(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS
                | WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION, false);
        getWindow().setStatusBarColor(Color.TRANSPARENT);
        getWindow().setNavigationBarColor(Color.TRANSPARENT);
    }
}

private void setWindowFlag(final int bits, boolean on) {
    Window win = getWindow();
    WindowManager.LayoutParams winParams = win.getAttributes();
    if (on) {
        winParams.flags |= bits;
    } else {
        winParams.flags &= ~bits;
    }
    win.setAttributes(winParams);
}

Answer:

To draw your layout under statusbar:

values/styles.xml

<item name="android:windowTranslucentStatus">true</item>

values-v21/styles.xml

<item name="android:windowDrawsSystemBarBackgrounds">true</item>
<item name="android:statusBarColor">@color/colorPrimaryDark</item>

Use CoordinatorLayout/DrawerLayout which already take care of the fitsSystemWindows parameter or create your own layout to like this:

public class FitsSystemWindowConstraintLayout extends ConstraintLayout {

    private Drawable mStatusBarBackground;
    private boolean mDrawStatusBarBackground;

    private WindowInsetsCompat mLastInsets;

    private Map<View, int[]> childsMargins = new HashMap<>();

    public FitsSystemWindowConstraintLayout(Context context) {
        this(context, null);
    }

    public FitsSystemWindowConstraintLayout(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public FitsSystemWindowConstraintLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        if (ViewCompat.getFitsSystemWindows(this)) {
            ViewCompat.setOnApplyWindowInsetsListener(this, new android.support.v4.view.OnApplyWindowInsetsListener() {
                @Override
                public WindowInsetsCompat onApplyWindowInsets(View view, WindowInsetsCompat insets) {
                    FitsSystemWindowConstraintLayout layout = (FitsSystemWindowConstraintLayout) view;
                    layout.setChildInsets(insets, insets.getSystemWindowInsetTop() > 0);
                    return insets.consumeSystemWindowInsets();
                }
            });
            setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                    | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
            TypedArray typedArray = context.obtainStyledAttributes(new int[]{android.R.attr.colorPrimaryDark});
            try {
                mStatusBarBackground = typedArray.getDrawable(0);
            } finally {
                typedArray.recycle();
            }
        } else {
            mStatusBarBackground = null;
        }
    }

    public void setChildInsets(WindowInsetsCompat insets, boolean draw) {
        mLastInsets = insets;
        mDrawStatusBarBackground = draw;
        setWillNotDraw(!draw && getBackground() == null);

        for (int i = 0; i < getChildCount(); i++) {
            View child = getChildAt(i);
            if (child.getVisibility() != GONE) {
                if (ViewCompat.getFitsSystemWindows(this)) {
                    ConstraintLayout.LayoutParams layoutParams = (ConstraintLayout.LayoutParams) child.getLayoutParams();

                    if (ViewCompat.getFitsSystemWindows(child)) {
                        ViewCompat.dispatchApplyWindowInsets(child, insets);
                    } else {
                        int[] childMargins = childsMargins.get(child);
                        if (childMargins == null) {
                            childMargins = new int[]{layoutParams.leftMargin, layoutParams.topMargin, layoutParams.rightMargin, layoutParams.bottomMargin};
                            childsMargins.put(child, childMargins);
                        }
                        if (layoutParams.leftToLeft == LayoutParams.PARENT_ID) {
                            layoutParams.leftMargin = childMargins[0] + insets.getSystemWindowInsetLeft();
                        }
                        if (layoutParams.topToTop == LayoutParams.PARENT_ID) {
                            layoutParams.topMargin = childMargins[1] + insets.getSystemWindowInsetTop();
                        }
                        if (layoutParams.rightToRight == LayoutParams.PARENT_ID) {
                            layoutParams.rightMargin = childMargins[2] + insets.getSystemWindowInsetRight();
                        }
                        if (layoutParams.bottomToBottom == LayoutParams.PARENT_ID) {
                            layoutParams.bottomMargin = childMargins[3] + insets.getSystemWindowInsetBottom();
                        }
                    }
                }
            }
        }

        requestLayout();
    }

    public void setStatusBarBackground(Drawable bg) {
        mStatusBarBackground = bg;
        invalidate();
    }

    public Drawable getStatusBarBackgroundDrawable() {
        return mStatusBarBackground;
    }

    public void setStatusBarBackground(int resId) {
        mStatusBarBackground = resId != 0 ? ContextCompat.getDrawable(getContext(), resId) : null;
        invalidate();
    }

    public void setStatusBarBackgroundColor(@ColorInt int color) {
        mStatusBarBackground = new ColorDrawable(color);
        invalidate();
    }

    @Override
    public void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        if (mDrawStatusBarBackground && mStatusBarBackground != null) {
            int inset = mLastInsets != null ? mLastInsets.getSystemWindowInsetTop() : 0;
            if (inset > 0) {
                mStatusBarBackground.setBounds(0, 0, getWidth(), inset);
                mStatusBarBackground.draw(canvas);
            }
        }
    }
}

main_activity.xml

<FitsSystemWindowConstraintLayout 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">

    <ImageView
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:fitsSystemWindows="true"
        android:scaleType="centerCrop"
        android:src="@drawable/toolbar_background"
        app:layout_constraintBottom_toBottomOf="@id/toolbar"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="0dp"
        android:layout_height="?attr/actionBarSize"
        android:background="@android:color/transparent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:gravity="center"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@id/toolbar">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="Content"
            android:textSize="48sp" />
    </LinearLayout>
</FitsSystemWindowConstraintLayout>

Result:

Screenshot:
Screenshot

Answer:

Use android:fitsSystemWindows="false" in your top layout

Answer:

Here is a extension in kotlin that do the trick:

fun Activity.setTransparentStatusBar() {
    window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_LAYOUT_STABLE or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        window.statusBarColor = Color.TRANSPARENT
    }
}

Answer:

Using this code in your XML, you will be able to see time bar in your 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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">

Answer:

THERE ARE THREE STEPS:

1) Just use this code segment into your @OnCreate method

@OnCreate{
  // FullScreen
  getWindow().setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS, 
  WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
}

if you’re working on Fragment, you should put this code segment in your activity’s @OnCreate method.

2) Be sure to also set the transparency in /res/values-v21/styles.xml:

<item name="android:statusBarColor">@android:color/transparent</item>

Or you can set the transparency programmatically:

getWindow().setStatusBarColor(Color.TRANSPARENT);

3) In anyway you should add the code segment in styles.xml

<item name="android:windowTranslucentStatus">true</item>

NOTE: This method just works on API 21 and above.

Answer:

You Can Use Below Code To Make Status Bar Transparent.
See Images With red highlight which helps you to identify use of Below code
[1]]

Code For Kotlin Developer

Step:1 Write down code in On create Method

if (Build.VERSION.SDK_INT >= 19 && Build.VERSION.SDK_INT < 21) {
    setWindowFlag(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS, true)
}
if (Build.VERSION.SDK_INT >= 19) {
    window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_LAYOUT_STABLE or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
}
if (Build.VERSION.SDK_INT >= 21) {
    setWindowFlag(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS, false)
    window.statusBarColor = Color.TRANSPARENT}

Step2: You Need SetWindowFlag method which describe in Below code.

private fun setWindowFlag(bits: Int, on: Boolean) {
val win = window
val winParams = win.attributes
if (on) {
    winParams.flags = winParams.flags or bits
} else {
    winParams.flags = winParams.flags and bits.inv()
}
win.attributes = winParams}

Code For Android Developer

Step1: Main Activity Code

if (Build.VERSION.SDK_INT >= 19 && Build.VERSION.SDK_INT < 21) {
    setWindowFlag(this, WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS, true);
}
if (Build.VERSION.SDK_INT >= 19) {
    getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
}

if (Build.VERSION.SDK_INT >= 21) {
    setWindowFlag(this, WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS, false);
    getWindow().setStatusBarColor(Color.TRANSPARENT);}

Step2: SetWindowFlag Method

public static void setWindowFlag(Activity activity, final int bits, boolean on) {
Window win = activity.getWindow();
WindowManager.LayoutParams winParams = win.getAttributes();
if (on) {
    winParams.flags |= bits;
} else {
    winParams.flags &= ~bits;
}
win.setAttributes(winParams);}

Answer:

You can also view my example with animated avatar and animated text

CollapsingAvatarToolbarSample

Read my post on Medium

So lets me to explaine how it works. I created custom view implemented AppBarLayout.OnOffsetChangedListener. Inside HeadCollapsing Custom View i founded text and image view in AppBarLayout.

class HeadCollapsing(context: Context, attrs: AttributeSet?) : 
 FrameLayout(context, attrs), AppBarLayout.OnOffsetChangedListener {

  private fun findViews() {
            appBarLayout = findParentAppBarLayout()

            avatarContainerView = findViewById(R.id.imgb_avatar_wrap)

            titleToolbarText =  findViewById<AppCompatTextView>(id)

        }

  private fun findParentAppBarLayout(): AppBarLayout {
    val parent = this.parent
    return parent as? AppBarLayout ?: if (parent.parent is AppBarLayout) {
        parent.parent as AppBarLayout
    } else {
        throw IllegalStateException("Must be inside an AppBarLayout")
    }
}

  ...

     override fun onOffsetChanged(appBarLayout: AppBarLayout, offset:Int) {
           ...
           //Calculate expanded percentage
           val expandedPercentage = 1 - -offset / maxOffset
           updateViews(expandedPercentage)
     }
}

Then change views via calculated percentage. For example, how text
view changing:

         when {
                inversePercentage < ABROAD -> {
                    titleToolbarText?.visibility = View.VISIBLE
                    titleTolbarTextSingle?.visibility = View.INVISIBLE
                }

                inversePercentage > ABROAD -> {
                    titleToolbarText?.visibility = View.INVISIBLE
                    titleTolbarTextSingle?.visibility = View.VISIBLE
                    titleTolbarTextSingle?.let {
                        animateShowText(it)
                    }
                }
            }

To detect when need image collapse animate created Pair object

private var cashCollapseState: kotlin.Pair<Int, Int>? = null

with states: TO_EXPANDED_STATE, TO_COLLAPSED_STATE, WAIT_FOR_SWITCH, SWITCHED

  companion object {
        const val ABROAD = 0.95f
        const val TO_EXPANDED_STATE = 0
        const val TO_COLLAPSED_STATE = 1
        const val WAIT_FOR_SWITCH = 0
        const val SWITCHED = 1
    }

then cretaed animation for avatar swith state:

 when {
                cashCollapseState != null && cashCollapseState != state -> {
                    when (state.first) {
                        TO_EXPANDED_STATE -> {
                          // do calculates
                        }
                        TO_COLLAPSED_STATE -> {

                    ValueAnimator.ofFloat(avatarContainerView.translationX, translationX).apply {
                        addUpdateListener {
                            avatarContainerView.translationX = it.animatedValue as Float
                        }

                        duration = 350
                        (state.first == TO_COLLAPSED_STATE).apply {
                            if (this) interpolator = LinearInterpolator()
                        }
                        start()
                    }
                //SWITCH STATE CASE
                cashCollapseState = kotlin.Pair(state.first, SWITCHED)
            }

            else -> {
                cashCollapseState = kotlin.Pair(state.first, WAIT_FOR_SWITCH)
            }

Answer:

android:fitsSystemWindows="true" only work on v21. We can set it in theme xml or in parent layout like LinearLayout or in CoordinateLayout .
For below v21, We could not add this flag.
Please create different values folder with different style.xml file as per your need.

Answer:

You may try that.

private static void setStatusBarTransparent(Activity activity) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
                activity.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
                activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
                activity.getWindow().setStatusBarColor(Color.TRANSPARENT);
            } else {
                activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            }
        }

Answer:

add these lines into your Activity before the setContentView()

 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            Window w = getWindow();
            w.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS, WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
        }

add these 2 lines into your AppTheme

<item name="android:windowTranslucentStatus">true</item>
<item name="android:windowTranslucentNavigation">true</item>

and last thing your minSdkVersion must b 19

    minSdkVersion 19

Answer:

This worked for me:

<item name="android:statusBarColor">@android:color/transparent</item>
<item name="android:navigationBarColor">@android:color/transparent</item>
<item name="android:windowTranslucentStatus">false</item>
<item name="android:windowTranslucentNavigation">false</item>

Answer:

All one need is to go into MainActivity.java


protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Window g = getWindow();
        g.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS, WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);

        setContentView(R.layout.activity_main);

    }

Answer:

in my case as I’ve a bottom tool bar I had a problem when testing the previous solutions, the android system buttons are covered with my bottom menu
my solution is to add within the activity:

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

    // force full screen mode
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);


    setContentView(R.layout.main_activity_container);

Answer:

You can use this below code.

getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN); 
getWindow().setStatusBarColor(Color.TRANSPARENT);

Include this layout in your main layout.

toolbar.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/toolbarNav"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@android:color/transparent"
        app:contentInsetEnd="0dp"
        app:contentInsetLeft="0dp"
        app:contentInsetRight="0dp"
        app:contentInsetStart="0dp">

        <RelativeLayout
            android:id="@+id/rlBackImageLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@drawable/main_background2">  //add your color here

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="@dimen/_40sdp"
                android:layout_marginTop="@dimen/_16sdp"
                android:orientation="horizontal">

                <ImageView
                    android:id="@+id/toolbarIcon"
                    android:layout_width="@dimen/_30sdp"
                    android:layout_height="@dimen/_30sdp"
                    android:layout_gravity="center"
                    android:layout_marginStart="@dimen/_10sdp"
                    android:padding="@dimen/_5sdp"
                    android:src="@drawable/nav_icon" />

                <TextView
                    android:id="@+id/txtTitle"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_gravity="center"
                    android:layout_marginEnd="@dimen/_30sdp"
                    android:fontFamily="@font/muli_semibold"
                    android:gravity="center"
                    android:textColor="#fff"
                    android:textSize="@dimen/_14ssp"
                    android:textStyle="bold"
                    tools:text="test Data" />

            </LinearLayout>

        </RelativeLayout>

    </androidx.appcompat.widget.Toolbar>

Note: You can replace SDP and SSP with dp and sp respectively.

Answer:

in my case, i dont call at all “onCreate” (its a react native app and this can be fixes also by using the react-native StatusBar component) one can also use this:

override fun onStart() {
        super.onStart()
        window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or View.SYSTEM_UI_FLAG_LAYOUT_STABLE
        window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS)
        window.statusBarColor = Color.TRANSPARENT
}

Answer:

I found the answer while I investigating this library:
https://github.com/laobie/StatusBarUtil

so you need to add following codes to your activity

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS)
            window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS)
            window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION)
            window.statusBarColor = Color.TRANSPARENT
        } else {
            window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS)
        }

Answer:

 <item name="android:statusBarColor" tools:targetApi="lollipop">@android:color/transparent</item>
            <!--<item name="android:windowLightStatusBar" tools:targetApi="m">true</item>-->

Dont use windowLightStatusBar use instead statusBarColor = @android:color/transparent

Answer:

This is only for API Level >= 21. It works for me.
Here is my code (Kotlin)

override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        findViewById<View>(android.R.id.content).systemUiVisibility =
                View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or View.SYSTEM_UI_FLAG_LAYOUT_STABLE
}