//状态栏 @ 顶部getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);//A
//导航栏 @ 底部getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);//B
//这个加在哪个布局，该布局就会相应的向上（配置A）或者向下（配置B）或者向上下（同时配置AB）
扩展android:fitsSystemWindows="true"

 /**
  * 隐藏虚拟按键，并且全屏
  */
 protected void hideBottomUIMenu() {
  //隐藏虚拟按键，并且全屏
  if (Build.VERSION.SDK_INT > 11 && Build.VERSION.SDK_INT < 19) { // lower api
   View v = this.getWindow().getDecorView();
   v.setSystemUiVisibility(View.GONE);
  } else if (Build.VERSION.SDK_INT >= 19) {
   //for new api versions.
   View decorView = getWindow().getDecorView();
   int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
       | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY | View.SYSTEM_UI_FLAG_FULLSCREEN;
   decorView.setSystemUiVisibility(uiOptions);
  }
 }