SystemBarHelper.java 文件源码

/**
 * Android4.4以上的沉浸式全屏模式
 * 注:
 * 1.删除fitsSystemWindows属性:Android5.0以上使用该方法如果出现界面展示不正确,删除布局中所有fitsSystemWindows属性
 * 或者调用forceFitsSystemWindows方法
 * 2.不删除fitsSystemWindows属性:也可以区别处理,Android5.0以上使用自己的方式实现,不调用该方法
 *
 * @param window 一般都是用于Activity的window,也可以是其他的例如Dialog,DialogFragment
 * @param alpha 透明栏透明度[0.0-1.0]
 */
public static void immersiveStatusBar(Window window,
                                      @FloatRange(from = 0.0, to = 1.0) float alpha) {

  if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
    return;
  }

  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
    window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
    window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
    window.setStatusBarColor(Color.TRANSPARENT);

    int systemUiVisibility = window.getDecorView().getSystemUiVisibility();
    systemUiVisibility |= View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
    systemUiVisibility |= View.SYSTEM_UI_FLAG_LAYOUT_STABLE;
    window.getDecorView().setSystemUiVisibility(systemUiVisibility);
  } else {
    window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
  }

  ViewGroup decorView = (ViewGroup) window.getDecorView();
  ViewGroup contentView = (ViewGroup) window.getDecorView()
      .findViewById(Window.ID_ANDROID_CONTENT);
  View rootView = contentView.getChildAt(0);
  int statusBarHeight = getStatusBarHeight(window.getContext());
  if (rootView != null) {
    FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) rootView.getLayoutParams();
    ViewCompat.setFitsSystemWindows(rootView, true);
    lp.topMargin = -statusBarHeight;
    rootView.setLayoutParams(lp);
  }

  setTranslucentView(decorView, alpha);
}