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);
}
}
}
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。