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);
		}
	}
}