Make App bar and status bar transparent without FLAG_LAYOUT_NO_LIMITS

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.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="false"
    tools:context=".MainActivity"
    tools:openDrawer="start"
    tools:showIn="@layout/activity_main">
  
    <include
        layout="@layout/app_bar_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <com.google.android.material.navigation.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="225dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:background="@android:color/white"
        android:fitsSystemWindows="true"
        app:menu="@menu/activity_main_drawer" />
</androidx.drawerlayout.widget.DrawerLayout>

app_bar_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/background"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/bg_home"
    android:fitsSystemWindows="true"
    tools:context=".MainActivity"
    tools:showIn="@layout/activity_main">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/content"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <include
            layout="@layout/content_main"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <com.google.android.material.appbar.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@android:color/transparent"
            android:elevation="0dp"
            android:theme="@style/AppTheme.AppBarOverlay"
            app:elevation="0dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent">

            <androidx.appcompat.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:layout_marginTop="24dp"
                android:background="@android:color/transparent"
                android:elevation="0dp"
                android:theme="@style/AppTheme.AppBarOverlay"
                app:popupTheme="@style/AppTheme.PopupOverlay" />

        </com.google.android.material.appbar.AppBarLayout>

    </androidx.constraintlayout.widget.ConstraintLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>

MainActivity.java

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

    // setting status bar
    final Window window = this.getWindow();
    window.getDecorView().setSystemUiVisibility(
            View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                    | View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                    | View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR
    );
    window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
    window.setStatusBarColor(Color.TRANSPARENT);

    // prepare view
    setContentView(R.layout.activity_main);

    // Toolbar
    final Toolbar toolbar = findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    // drawer toggle
    final DrawerLayout drawer = findViewById(R.id.drawer_layout);
    drawer.setFitsSystemWindows(true);
    drawer.setClipToPadding(false);
    
    // ...
}

styles.xml

<style name="AppTheme.NoActionBar">
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>

    <!--<item name="android:windowTranslucentStatus">false</item>-->
    <!--<item name="android:windowLightStatusBar">false</item>-->
</style>

values-v21\styles.xml

<resources>
    <style name="AppTheme.NoActionBar">
        <item name="windowActionBar">false</item>
        <item name="windowNoTitle">true</item>

        <item name="android:statusBarColor">@android:color/transparent</item>
        <!--<item name="android:windowDrawsSystemBarBackgrounds">false</item>-->
        <!--<item name="android:windowTranslucentStatus">true</item>-->
    </style>
</resources>

REFERENCE

• Android Status Bar 透明化 Transparent
• adjustPan not working with FLAG_LAYOUT_NO_LIMITS
• 單純使用 FLAG_LAYOUT_NO_LIMITS 會讓 EditText 無法順利照著 windowSoftInputMode 調整