隐藏虚拟按键：

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);

}

}

这个也可以：

public void hideNavigationBar() {

int uiFlags = View.SYSTEM_UI_FLAG_LAYOUT_STABLE

| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION

| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN

| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION // hide nav bar

| View.SYSTEM_UI_FLAG_FULLSCREEN; // hide status bar

if (android.os.Build.VERSION.SDK_INT >= 19) {

uiFlags |= View.SYSTEM_UI_FLAG_IMMERSIVE;//0x00001000; // SYSTEM_UI_FLAG_IMMERSIVE_STICKY: hide

} else {

uiFlags |= View.SYSTEM_UI_FLAG_LOW_PROFILE;

}

try {

getWindow().getDecorView().setSystemUiVisibility(uiFlags);

} catch (Exception e) {

// TODO: handle exception

}

}