隱藏虛擬按鍵的實現

package com.example.viewexcercises;

import android.os.Bundle;
import android.view.View;
import android.R.layout;
import android.app.Activity;
import android.view.Menu;

public class MainActivity extends Activity implements View.OnClickListener,View.OnSystemUiVisibilityChangeListener{

	private View main;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		main=getLayoutInflater().inflate(R.layout.activity_main,null);
		setContentView(main);
		main.setOnClickListener(this);
		//剛開始爲可見狀態，也是默認狀態
		main.setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	@Override
	public void onSystemUiVisibilityChange(int visibility) {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		int status=main.getSystemUiVisibility();
		if (status==View.SYSTEM_UI_FLAG_LOW_PROFILE) {
			//虛擬按鍵將被隱藏,且不佔空間
			main.setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
		}
		else if(status==View.SYSTEM_UI_FLAG_HIDE_NAVIGATION){
			main.setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);
		}
		else if (status==View.SYSTEM_UI_FLAG_VISIBLE) {
			//虛擬按鍵被隱藏，但佔必定空間
			main.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE);
		}
		
	}

}