隐藏虚拟按键并全屏
https://developer.android.com/training/system-ui/navigation.html#behind
private void hideSystemNavigationBar() {
if (Build.VERSION.SDK_INT > 11 && Build.VERSION.SDK_INT < 19) {
View view = this.getWindow().getDecorView();
view.setSystemUiVisibility(View.GONE);
} else if (Build.VERSION.SDK_INT >= 19) {
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);
}
}
