android 滑动菜单SlidingMenu的实现

首先我们看下面视图:

      

这种效果大家都不陌生,网上好多都说是仿人人网的,估计人家牛逼出来的早吧,我也参考了一一些例子,实现起来有三种方法,我下面简单介绍下:

方法一:其实就是对GestureDetector手势的应用及布局文件的设计.

布局文件main.xml    采用RelativeLayout布局.




    

        

            
        

        
        
    

    

        

            

            
        

        
    


layout_right:这个大布局文件,layout_left:距离左边50dp像素.(我们要移动的是layout_left).

看到这个图我想大家都很清晰了吧,其实:我们就是把layout_left这个布局控件整理向左移动,至于移动多少,就要看layout_right有多宽了。layout_left移动到距离左边的边距就是layout_right的宽及-MAX_WIDTH.相信大家都理解.

布局文件就介绍到这里,下面看代码.

/***
	 * 初始化view
	 */
	void InitView() {
		layout_left = (LinearLayout) findViewById(R.id.layout_left);
		layout_right = (LinearLayout) findViewById(R.id.layout_right);
		iv_set = (ImageView) findViewById(R.id.iv_set);
		lv_set = (ListView) findViewById(R.id.lv_set);
		lv_set.setAdapter(new ArrayAdapter(this, R.layout.item,
				R.id.tv_item, title));
		lv_set.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView parent, View view,
					int position, long id) {
				Toast.makeText(MainActivity.this, title[position], 1).show();
			}
		});
		layout_left.setOnTouchListener(this);
		iv_set.setOnTouchListener(this);
		mGestureDetector = new GestureDetector(this);
		// 禁用长按监听
		mGestureDetector.setIsLongpressEnabled(false);
		getMAX_WIDTH();
	}

这里要对手势进行监听,我想大家都知道怎么做,在这里我要说明一个方法

/***
	 * 获取移动距离 移动的距离其实就是layout_left的宽度
	 */
	void getMAX_WIDTH() {
		ViewTreeObserver viewTreeObserver = layout_left.getViewTreeObserver();
		// 获取控件宽度
		viewTreeObserver.addOnPreDrawListener(new OnPreDrawListener() {
			@Override
			public boolean onPreDraw() {
				if (!hasMeasured) {
					window_width = getWindowManager().getDefaultDisplay()
							.getWidth();
					RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) layout_left
							.getLayoutParams();
					layoutParams.width = window_width;
					layout_left.setLayoutParams(layoutParams);
					MAX_WIDTH = layout_right.getWidth();
					Log.v(TAG, "MAX_WIDTH=" + MAX_WIDTH + "width="
							+ window_width);
					hasMeasured = true;
				}
				return true;
			}
		});

	}

在这里我们要获取屏幕的宽度,并将屏幕宽度设置给layout_left这个控件,为什么要这么做呢因为如果不把该控件宽度写死的话,那么系统将认为layout_left会根据不同环境宽度自动适应,也就是说我们通过layout_left.getLayoutParams动态移动该控件的时候,该控件会伸缩而不是移动。描述的有点模糊,大家请看下面示意图就明白了.

我们不为layout_left定义死宽度效果:

     

getLayoutParams可以很清楚看到,layout_left被向左拉伸了,并不是我们要的效果.

还有一种解决办法就是我们在配置文件中直接把layout_left宽度写死,不过这样不利于开发,因为分辨率的问题.因此就用ViewTreeObserver进行对layout_left设置宽度.

ViewTreeObserver,这个类主要用于对布局文件的监听.强烈建议同学们参考这篇文章  android ViewTreeObserver详细讲解 ,相信让你对ViewTreeObserver有更一步的了解.

其他的就是对GestureDetector手势的应用,下面我把代码贴出来:

package com.jj.slidingmenu;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.GestureDetector;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.ViewTreeObserver.OnPreDrawListener;
import android.view.Window;
import android.view.View.OnTouchListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.Toast;
import android.widget.LinearLayout.LayoutParams;

/***
 * 滑动菜单
 * 
 * @author jjhappyforever...
 * 
 */
public class MainActivity extends Activity implements OnTouchListener,
		GestureDetector.OnGestureListener {
	private boolean hasMeasured = false;// 是否Measured.
	private LinearLayout layout_left;
	private LinearLayout layout_right;
	private ImageView iv_set;
	private ListView lv_set;

	/** 每次自动展开/收缩的范围 */
	private int MAX_WIDTH = 0;
	/** 每次自动展开/收缩的速度 */
	private final static int SPEED = 30;

	private GestureDetector mGestureDetector;// 手势
	private boolean isScrolling = false;
	private float mScrollX; // 滑块滑动距离
	private int window_width;// 屏幕的宽度

	private String TAG = "jj";

	private String title[] = { "待发送队列", "同步分享设置", "编辑我的资料", "找朋友", "告诉朋友",
			"节省流量", "推送设置", "版本更新", "意见反馈", "积分兑换", "精品应用", "常见问题", "退出当前帐号" };

	/***
	 * 初始化view
	 */
	void InitView() {
		layout_left = (LinearLayout) findViewById(R.id.layout_left);
		layout_right = (LinearLayout) findViewById(R.id.layout_right);
		iv_set = (ImageView) findViewById(R.id.iv_set);
		lv_set = (ListView) findViewById(R.id.lv_set);
		lv_set.setAdapter(new ArrayAdapter(this, R.layout.item,
				R.id.tv_item, title));
		lv_set.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView parent, View view,
					int position, long id) {
				Toast.makeText(MainActivity.this, title[position], 1).show();
			}
		});
		layout_left.setOnTouchListener(this);
		iv_set.setOnTouchListener(this);
		mGestureDetector = new GestureDetector(this);
		// 禁用长按监听
		mGestureDetector.setIsLongpressEnabled(false);
		getMAX_WIDTH();
	}

	/***
	 * 获取移动距离 移动的距离其实就是layout_left的宽度
	 */
	void getMAX_WIDTH() {
		ViewTreeObserver viewTreeObserver = layout_left.getViewTreeObserver();
		// 获取控件宽度
		viewTreeObserver.addOnPreDrawListener(new OnPreDrawListener() {
			@Override
			public boolean onPreDraw() {
				if (!hasMeasured) {
					window_width = getWindowManager().getDefaultDisplay()
							.getWidth();
					RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) layout_left
							.getLayoutParams();
					// layoutParams.width = window_width;
					layout_left.setLayoutParams(layoutParams);
					MAX_WIDTH = layout_right.getWidth();
					Log.v(TAG, "MAX_WIDTH=" + MAX_WIDTH + "width="
							+ window_width);
					hasMeasured = true;
				}
				return true;
			}
		});

	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.main);
		InitView();

	}

	// 返回键
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (KeyEvent.KEYCODE_BACK == keyCode && event.getRepeatCount() == 0) {
			RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) layout_left
					.getLayoutParams();
			if (layoutParams.leftMargin < 0) {
				new AsynMove().execute(SPEED);
				return false;
			}
		}

		return super.onKeyDown(keyCode, event);
	}

	@Override
	public boolean onTouch(View v, MotionEvent event) {
		// 松开的时候要判断,如果不到半屏幕位子则缩回去,
		if (MotionEvent.ACTION_UP == event.getAction() && isScrolling == true) {
			RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) layout_left
					.getLayoutParams();
			// 缩回去
			if (layoutParams.leftMargin < -window_width / 2) {
				new AsynMove().execute(-SPEED);
			} else {
				new AsynMove().execute(SPEED);
			}
		}

		return mGestureDetector.onTouchEvent(event);
	}

	@Override
	public boolean onDown(MotionEvent e) {
		mScrollX = 0;
		isScrolling = false;
		// 将之改为true,不然事件不会向下传递.
		return true;
	}

	@Override
	public void onShowPress(MotionEvent e) {

	}

	/***
	 * 点击松开执行
	 */
	@Override
	public boolean onSingleTapUp(MotionEvent e) {
		RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) layout_left
				.getLayoutParams();
		// 左移动
		if (layoutParams.leftMargin >= 0) {
			new AsynMove().execute(-SPEED);
		} else {
			// 右移动
			new AsynMove().execute(SPEED);
		}

		return true;
	}

	/***
	 * e1 是起点,e2是终点,如果distanceX=e1.x-e2.x>0说明向左滑动。反之亦如此.
	 */
	@Override
	public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
			float distanceY) {
		isScrolling = true;
		mScrollX += distanceX;// distanceX:向左为正,右为负
		RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) layout_left
				.getLayoutParams();
		layoutParams.leftMargin -= mScrollX;
		if (layoutParams.leftMargin >= 0) {
			isScrolling = false;// 拖过头了不需要再执行AsynMove了
			layoutParams.leftMargin = 0;

		} else if (layoutParams.leftMargin <= -MAX_WIDTH) {
			// 拖过头了不需要再执行AsynMove了
			isScrolling = false;
			layoutParams.leftMargin = -MAX_WIDTH;
		}
		layout_left.setLayoutParams(layoutParams);
		return false;
	}

	@Override
	public void onLongPress(MotionEvent e) {

	}

	@Override
	public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
			float velocityY) {
		return false;
	}

	class AsynMove extends AsyncTask {

		@Override
		protected Void doInBackground(Integer... params) {
			int times = 0;
			if (MAX_WIDTH % Math.abs(params[0]) == 0)// 整除
				times = MAX_WIDTH / Math.abs(params[0]);
			else
				times = MAX_WIDTH / Math.abs(params[0]) + 1;// 有余数

			for (int i = 0; i < times; i++) {
				publishProgress(params[0]);
				try {
					Thread.sleep(Math.abs(params[0]));
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}

			return null;
		}

		/**
		 * update UI
		 */
		@Override
		protected void onProgressUpdate(Integer... values) {
			RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) layout_left
					.getLayoutParams();
			// 右移动
			if (values[0] > 0) {
				layoutParams.leftMargin = Math.min(layoutParams.leftMargin
						+ values[0], 0);
				Log.v(TAG, "移动右" + layoutParams.rightMargin);
			} else {
				// 左移动
				layoutParams.leftMargin = Math.max(layoutParams.leftMargin
						+ values[0], -MAX_WIDTH);
				Log.v(TAG, "移动左" + layoutParams.rightMargin);
			}
			layout_left.setLayoutParams(layoutParams);

		}

	}

}

上面代码注释已经很明确,相信大家都看的明白,我就不过多解释了。

效果图:截屏出来有点卡,不过在手机虚拟机上是不卡的.



源码下载


怎么样,看着还行吧,我们在看下面一个示例:



简单说明一下,当你滑动的时候左边会跟着右边一起滑动,这个效果比上面那个酷吧,上面那个有点死板,其实实现起来也比较容易,只需要把我们上面那个稍微修改下,对layout_right也进行时时更新,这样就实现了这个效果了,如果上面那个理解了,这个很轻松就解决了,在这里我又遇到一个问题:此时的listview的item监听不到手势,意思就是我左右滑动listview他没有进行滑动。

本人对touch众多事件监听拦截等熟悉度不够,因此这里我用到自己写的方法,也许比较麻烦,如果有更好的解决办法,请大家一定要分享哦,再次 thanks for you 了.

具体解决办法:我们重写listview,对此listview进行手势监听,我们自定义一个接口来实现,具体代码如下:

package com.jj.slidingmenu;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.GestureDetector.OnGestureListener;
import android.view.View;
import android.widget.ListView;
import android.widget.Toast;

public class MyListView extends ListView implements OnGestureListener {

	private GestureDetector gd;
	// 事件状态
	public static final char FLING_CLICK = 0;
	public static final char FLING_LEFT = 1;
	public static final char FLING_RIGHT = 2;
	public static char flingState = FLING_CLICK;

	private float distanceX;// 水平滑动的距离

	private MyListViewFling myListViewFling;

	public static boolean isClick = false;// 是否可以点击

	public void setMyListViewFling(MyListViewFling myListViewFling) {
		this.myListViewFling = myListViewFling;
	}

	public float getDistanceX() {
		return distanceX;
	}

	public char getFlingState() {
		return flingState;
	}

	private Context context;

	public MyListView(Context context) {
		super(context);

	}

	public MyListView(Context context, AttributeSet attrs) {
		super(context, attrs);
		this.context = context;
		gd = new GestureDetector(this);
	}

	/**
	 * 覆写此方法,以解决ListView滑动被屏蔽问题
	 */
	@Override
	public boolean dispatchTouchEvent(MotionEvent event) {
		myListViewFling.doFlingOver(event);// 回调执行完毕.
		this.gd.onTouchEvent(event);

		return super.dispatchTouchEvent(event);
	}

	@Override
	public boolean onTouchEvent(MotionEvent ev) {
		/***
		 * 当移动的时候
		 */
		if (ev.getAction() == MotionEvent.ACTION_DOWN)
			isClick = true;
		if (ev.getAction() == MotionEvent.ACTION_MOVE)
			isClick = false;
		return super.onTouchEvent(ev);
	}

	@Override
	public boolean onDown(MotionEvent e) {
		int position = pointToPosition((int) e.getX(), (int) e.getY());
		if (position != ListView.INVALID_POSITION) {
			View child = getChildAt(position - getFirstVisiblePosition());
		}
		return true;
	}

	@Override
	public void onShowPress(MotionEvent e) {

	}

	@Override
	public boolean onSingleTapUp(MotionEvent e) {

		return false;
	}

	@Override
	public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
			float distanceY) {
		// 左滑动
		if (distanceX > 0) {
			flingState = FLING_RIGHT;
			Log.v("jj", "左distanceX=" + distanceX);
			myListViewFling.doFlingLeft(distanceX);// 回调
			// 右滑动.
		} else if (distanceX < 0) {
			flingState = FLING_LEFT;
			Log.v("jj", "右distanceX=" + distanceX);
			myListViewFling.doFlingRight(distanceX);// 回调
		}

		return false;
	}

	/***
	 * 上下文菜单
	 */
	@Override
	public void onLongPress(MotionEvent e) {
		// System.out.println("Listview long press");
		// int position = pointToPosition((int) e.getX(), (int) e.getY());
		// if (position != ListView.INVALID_POSITION) {
		// View child = getChildAt(position - getFirstVisiblePosition());
		// if (child != null) {
		// showContextMenuForChild(child);
		// this.requestFocusFromTouch();
		// }
		//
		// }
	}

	@Override
	public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
			float velocityY) {

		return false;
	}

	/***
	 * 回调接口
	 * 
	 * @author jjhappyforever...
	 * 
	 */
	interface MyListViewFling {
		void doFlingLeft(float distanceX);// 左滑动执行

		void doFlingRight(float distanceX);// 右滑动执行

		void doFlingOver(MotionEvent event);// 拖拽松开时执行

	}

}

而在MainActivity.java里面实现该接口,我这么一说,我想有的同学们都明白了,具体实现起来代码有点多,我把代码上传到网上,大家可以下载后用心看,我想大家都能够明白的.(在这里我鄙视一下自己,肯定通过对手势监听拦截实现对listview的左右滑动,但是自己学业不经,再次再说一下,如有好的解决方案,请一定要分享我一下哦.)

另外有一个问题:当listivew超出一屏的时候,此时的listview滑动的时候可以上下左右一起滑动,在此没有解决这个问题,如有解决请分享我哦.

效果图:



源码下载


由于篇符较长,先说到这里,其实android 自定义ViewGroup和对view进行切图动画实现滑动菜单SlidingMenu也可以实现.具体参考下一篇文章:android 自定义ViewGroup和对view进行切图动画实现滑动菜单SlidingMenu

先写到这里,有不足的地方请指出,

如果对您有帮助的话请记得赞一个哦. thanks for you。


来源:http://blog.csdn.net/jj120522/article/details/8075249



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