/**
   * 设置沉浸式状态栏颜色
   *
   * @param colorResId 状态栏颜色
   */
  protected void setImmersiveStatusBarColor(@ColorRes int colorResId) {
    int flags = View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
      int statusBarColor = ApkUtil.getColor(this, colorResId); //①
      float lightDegress = (Color.red(statusBarColor) + Color.green(statusBarColor) + Color.blue(statusBarColor)) / 3; //作色彩亮度判断，好针对颜色做相应的状态栏的暗色还是亮色。
      if ((lightDegress > 200 || lightDegress == 0) && Build.VERSION.SDK_INT > Build.VERSION_CODES.M)
        rootView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR);
      window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
      window.setStatusBarColor(statusBarColor);
    } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
      window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
      rootView.setSystemUiVisibility(flags | View.SYSTEM_UI_FLAG_IMMERSIVE | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
    } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
      rootView.setSystemUiVisibility(flags);
    }
    if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.KITKAT) { //当API小于等于19，此时为了实现沉浸式状态栏，需要添加一个view来做statusbar背景控件
      final boolean isHasStatusBarView = rootView.getTag() != null;
      View statusbarView = !isHasStatusBarView ? new View(this) : (View)rootView.getTag();
      statusbarView.setBackgroundResource(colorResId);
      if(!isHasStatusBarView) {
        rootView.setTag(statusBarView);
        statusbarView.setLayoutParams(new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, ViewUtil.getStatusBarHeight(this))); //②
        rootView.addView(statusbarView);
      }
    }
  }

  /**
   * 获取颜色资源
   * @param context 上下文对象
   * @param colorId 颜色ResId
   * @return
   */
  @SuppressWarnings("deprecation")
  public static int getColor(Context context, int colorId) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
      return context.getColor(colorId);
    }
    return context.getResources().getColor(colorId);
  }

  /**
   * 获取状态栏高度
   * @param context 上下文对象
   */
  @JvmStatic
  @SuppressLint("PrivateApi")
  fun getStatusBarHeight(context: Context): Int {
    val clazz = Class.forName("com.android.internal.R\$dimen")
    val obj = clazz?.newInstance()
    val field = clazz.getField("status_bar_height")
    field?.let {
      field.isAccessible = true
      val x = Integer.parseInt(field.get(obj).toString())
      return context.resources.getDimensionPixelSize(x)
    }
    return 75
  }

 android:fitsSystemWindows="true"
 android:clipToPadding="false"