侧边栏的简单实现（使用drawerLayout）

不能算真正意义上的侧边栏

首先root 布局使用android.support.v4.widget.DrawerLayout

布局文件：

java代码：

package com.drawerlayoutdemo;

import android.os.Bundle;
import android.app.Activity;
import android.support.v4.widget.DrawerLayout;
import android.support.v4.widget.DrawerLayout.DrawerListener;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.widget.RelativeLayout;

public class MainActivity extends Activity implements DrawerListener {

	private DrawerLayout mainLayout;
	private RelativeLayout contentLayout, drawerLayout;
	private String tag = "MainActivity";
	//用该变量标示抽屉是否被打开
	private boolean drawIsOpened = false;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		mainLayout = (DrawerLayout) findViewById(R.id.main_layout);
		mainLayout.setDrawerListener(this);

		//获取主布局
		contentLayout = (RelativeLayout) findViewById(R.id.content_layout);
		//获取左侧布局
		drawerLayout = (RelativeLayout) findViewById(R.id.drawer_layout);
	}

	//如果要使用菜单键来（打开||关闭）抽屉，则重写onKeyDown方法
	//根据drawIsOpened来决定是（打开||关闭）
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == KeyEvent.KEYCODE_MENU) {
			if (drawIsOpened) {
				mainLayout.closeDrawer(drawerLayout);
			} else {
				mainLayout.openDrawer(drawerLayout);
			}
		}
		return super.onKeyDown(keyCode, event);
	}

	/* 覆写DrawerListener里的方法 */
	@Override
	public void onDrawerClosed(View arg0) {
		Log.i(tag, "drawer close");
		drawIsOpened = false;
	}

	@Override
	public void onDrawerOpened(View arg0) {
		// TODO Auto-generated method stub
		Log.i(tag, "drawer open");
		drawIsOpened = true;
	}

	@Override
	public void onDrawerSlide(View arg0, float delta) {
		Log.i(tag, "draw slide");
		Log.i(tag, delta + "");
	}

	@Override
	public void onDrawerStateChanged(int state) {
		Log.i(tag, "draw state change to " + state);
	}
	/* 覆写DrawerListener里的方法 */
}