利用popupWindow来制作自定义menu

我找了好久没发现怎么给系统自带的menu换背景，网上有个帖子写了相关方法，但是我没实现

所以才去了用popupwindow来实现menu:

先定义了这个popupwindow类：

public class MenuPopupWindow {
	public PopupWindow pop;
	private Context ctx;
	boolean isPopShowing = false;
	
	Handler menuHandler;
	public MenuPopupWindow(Context ctx,Handler menuHandler){
		this.ctx = ctx;
		
		this.menuHandler = menuHandler;
		initMenu();
	}
    private void initMenu() {
		LayoutInflater inflater = LayoutInflater.from(ctx);
		View view = inflater.inflate(R.layout.popwindow, null);

		pop = new PopupWindow(view, 480, 173);// 大小设置
		pop.setOutsideTouchable(false);
		// 很奇怪，不设置background 点击pop外面,pop不会消失
//		pop.setBackgroundDrawable(new BitmapDrawable());
		pop.setBackgroundDrawable(ctx.getResources().getDrawable(R.drawable.menubg));
		pop.setFocusable(true);// 如果不加这个，Grid不会响应ItemClick
		pop.setOnDismissListener(new OnDismissListener() {
			public void onDismiss() {
				isPopShowing = false;
			}
		});

		

		GridView menuGrid = (GridView) view.findViewById(R.id.gridview);
		menuGrid.setSelector(new ColorDrawable(Color.TRANSPARENT));
		menuGrid.setAdapter(new AdapterGridView(ctx));
//		menuGrid.setAdapter(getMenuAdapter(menuNameArray, menuImageArray));
		menuGrid.setOnItemClickListener(new OnItemClickListener() {
			public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
					long arg3) {
				menuHandler.sendEmptyMessage(arg2);//发消息给主线程来处理
				if (pop.isShowing()) // 关闭菜单
					pop.dismiss();
			}
		});
		menuGrid.setOnKeyListener(onKey);

	}
    
	OnKeyListener onKey = new OnKeyListener() {
		public boolean onKey(View v, int keyCode, KeyEvent event) {
			// TODO Auto-generated method stub
			if (keyCode == KeyEvent.KEYCODE_MENU && isPopShowing == false) {
				isPopShowing = true;
			} else {
				isPopShowing = false;
				pop.dismiss();
			}
			return false;
		}
    };
    
}

然后在主程序里面 生成这个类的对象，在自己想要显示的位置显示之

MenuPopupWindow myPop = new MenuPopupWindow(this,menuHandler);
pop = myPop.pop;

public boolean onCreateOptionsMenu(Menu menu) {
	pop.showAtLocation(findViewById(R.id.main), Gravity.CENTER
				| Gravity.BOTTOM, 0, 0);
	return false;
}

popupwindow 里面的gridview设置的监听器 handler发出的消息会在主程序中做相应的动作

public Handler menuHandler = new Handler() {
	public void handleMessage(Message msg) {
		switch (msg.what) {
		case 0:
                        //do something
		        break;
		case 1:
                       //do something
			break;
		case 2:
                       //do something
			break;
		case 3:
                       //do something
			break;
		case 4:
                       //do something
			break;
		case 5:
                       //do something
			break;
		default:
			break;
			}
		}
	};

gridView里面 设置TRANSPARENT 是为了去掉 自身的点击效果，用来加上自己的selector

然后在adapter里面可以对 单个的Item 设置clickable 同时 换七背景来实现

类似menu的不可点击事件。