设置系统栏可见性

public static void setSystemBarVisible(final Activity context,

   boolean visible) {

  int flag = context.getWindow().getDecorView().getSystemUiVisibility();

  // int fullScreen = View.SYSTEM_UI_FLAG_SHOW_FULLSCREEN;

  int fullScreen = 0x8;

  if (visible) {

   if ((flag & fullScreen) != 0) {

    context.getWindow().getDecorView()

      .setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);

   }

  } else {

   if ((flag & fullScreen) == 0) {

    context.getWindow().getDecorView()

      .setSystemUiVisibility(flag | fullScreen);

   }

  }

 }