透明的系统状态栏SystemBar

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• values/styles.xml

  <resources>
  
      <!-- Base application 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>
          <!-- Customize your theme here. -->
      </style>
  
      <style name="AppTheme.NoActionBar">
          <item name="windowActionBar">false</item>
          <item name="windowNoTitle">true</item>
      </style>
  
  </resources>
  

• values-v19/styles.xml

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

• values-v21/styles.xml

  <resources>
  
      <style name="AppTheme.NoActionBar">
          <item name="windowActionBar">false</item>
          <item name="windowNoTitle">true</item>
          <item name="android:windowDrawsSystemBarBackgrounds">true</item>
          <item name="android:statusBarColor">@color/colorPrimaryDark</item>
      </style>
  
  </resources>
  

• layout/activity_main.xml

  <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:background="@drawable/color_bg"
      tools:context=".MainActivity">
  
      <android.support.v7.widget.Toolbar
          android:id="@+id/toolbar"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:fitsSystemWindows="true"
          android:background="@android:color/transparent"
          android:minHeight="?attr/actionBarSize">
  
          <TextView
              android:id="@+id/title"
              style="@style/TextAppearance.AppCompat.Subhead"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_gravity="left"
              android:text="1111"
              android:textColor="@color/colorPrimaryDark"
              android:textSize="20sp" />
      </android.support.v7.widget.Toolbar>
  
      <!--<ImageView-->
          <!--android:id="@+id/img"-->
          <!--android:layout_width="match_parent"-->
          <!--android:layout_height="match_parent"-->
          <!--android:scaleType="centerCrop"-->
          <!--android:src="@drawable/color_bg" />-->
  
  </RelativeLayout>
  

• systembardemo/MainActivity.java

  @Override 
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
  
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
          // Translucent status bar 
          getWindow().setFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS, WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
      } 
  
      setContentView(R.layout.activity_main);
  }