android隐藏底部虚拟键Navigation Bar实现全屏

package com.my.fullscreen;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;

public class MainActivity extends Activity implements OnClickListener {
View main;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
main = getLayoutInflater().inflate(R.layout.activity_main, null);
main.setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
main.setOnClickListener(this);
setContentView(main);

}

@Override
public void onClick(View v) {
int i = main.getSystemUiVisibility();
if (i == View.SYSTEM_UI_FLAG_HIDE_NAVIGATION) {//2
main.setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);
} else if (i == View.SYSTEM_UI_FLAG_VISIBLE) {//0
main.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE);
} else if (i == View.SYSTEM_UI_FLAG_LOW_PROFILE) {//1
main.setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
}
}
}