Android仿微信ListView滑动出现Delete按钮--优化版
来源：互联网 发布：大数据采集平台 编辑：程序博客网 时间：2024/06/07 19:11
Android仿微信ListView滑动出现Delete按钮，在网上搜到一个例子（原作者博客没找到，抱歉），效果图是这样的，相信很多人用过，
在结合自己项目使用过程中，发现一些问题，例如滑动时经常触发OnItemClick事件，于是在原来的基础上进行了一些优化。
ListViewCompat.java
package com.ryg.slideview;import com.ryg.slideview.MainActivity.MessageItem;import com.ryg.slideview.SlideView.OnSlideListener;import android.content.Context;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.VelocityTracker;import android.view.View;import android.view.ViewConfiguration;import android.widget.AdapterView;import android.widget.ListView;public class ListViewCompat extends ListView { private static final String TAG = "ListViewCompat"; private SlideView mFocusedItemView = null; /** * 速度追踪对象 */private VelocityTracker velocityTracker;/** * 手指按下X的坐标 */private int downY;/** * 手指按下Y的坐标 */private int downX;/** * 当前滑动的ListView position */private int slidePosition;private static final int SNAP_VELOCITY = 600;/** * 是否响应滑动，默认为不响应 */private boolean isSlide = false;/** * 认为是用户滑动的最小距离 */private int mTouchSlop;/** * 设置是否有HeadView、FootView */private Boolean hasHeadView = false;private Boolean hasFootView = false;/** * 上次处于打开状态的SlideView */private SlideView mLastSlideViewWithStatusOn; public ListViewCompat(Context context) { super(context); mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop(); } public ListViewCompat(Context context, AttributeSet attrs) { super(context, attrs); mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop(); } public ListViewCompat(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop(); } public void shrinkListItem(int position) { View item = getChildAt(position); if (item != null) { try { ((SlideView) item).shrink(); } catch (ClassCastException e) { e.printStackTrace(); } } } /** * 分发事件，主要做的是判断点击的是那个item, 以及通过设置isSlide值判断是否传递Event事件 * 给SlideView响应左右滑动事件 */@Overridepublic boolean dispatchTouchEvent(MotionEvent event) {addVelocityTracker(event);switch (event.getAction()) {case MotionEvent.ACTION_DOWN: {// 假如scroller滚动还没有结束，我们直接返回/*if (!scroller.isFinished()) {return super.dispatchTouchEvent(event);}*/downX = (int) event.getX();downY = (int) event.getY();slidePosition = pointToPosition(downX, downY);// 有HeadView，过滤HeadView滑动if (hasHeadView) {if (slidePosition == 0) {slidePosition = AdapterView.INVALID_POSITION;}}// 有FootView，过滤FootView滑动if (hasFootView) {if (slidePosition == getAdapter().getCount() - 1) {// 此处FootView的position应为<span style="font-family: Arial, Helvetica, sans-serif;">getAdapter().getCount() - 1，<span style="color:#ff0000;">请注意下载代码中未修改</span></span>slidePosition = AdapterView.INVALID_POSITION;}}// 无效的position, 不做任何处理if (slidePosition == AdapterView.INVALID_POSITION) {return super.dispatchTouchEvent(event);}if (slidePosition != INVALID_POSITION) { //得到当前点击行的数据从而取出当前行的item。 //可能有人怀疑，为什么要这么干？为什么不用getChildAt(position)？ //因为ListView会进行缓存，如果你不这么干，有些行的view你是得不到的。 MessageItem data = (MessageItem) getItemAtPosition(slidePosition); mFocusedItemView = data.slideView; } else { mFocusedItemView = null; }// 单击时，如果当前有SlideView是打开状态，设置isSlide = true，依然传递Event事件给SlideView响应左右滑动事件。此时不响应OnItemClick事件if (mLastSlideViewWithStatusOn != null && mLastSlideViewWithStatusOn.getSlideStatus() != OnSlideListener.SLIDE_STATUS_OFF) {isSlide = true;}break;}case MotionEvent.ACTION_MOVE: {// 判断是否横向移动if (Math.abs(getScrollVelocity()) > SNAP_VELOCITY|| (Math.abs(event.getX() - downX) > mTouchSlop && Math.abs(event.getY() - downY) < mTouchSlop)) {isSlide = true;}break;}case MotionEvent.ACTION_UP:recycleVelocityTracker();break;}return super.dispatchTouchEvent(event);} @Override public boolean onTouchEvent(MotionEvent event) { // 向当前点击的view发送滑动事件请求，其实就是向SlideView发请求 if (isSlide && slidePosition != AdapterView.INVALID_POSITION && mFocusedItemView != null) { mFocusedItemView.onRequireTouchEvent(event); mLastSlideViewWithStatusOn = mFocusedItemView; final int action = event.getAction();switch (action) {case MotionEvent.ACTION_MOVE:break;case MotionEvent.ACTION_UP:// 手指离开的时候就不响应左右滚动isSlide = false;break;} return true; } return super.onTouchEvent(event); } /** * 添加用户的速度跟踪器 * * @param event */private void addVelocityTracker(MotionEvent event) {if (velocityTracker == null) {velocityTracker = VelocityTracker.obtain();}velocityTracker.addMovement(event);}/** * 移除用户速度跟踪器 */private void recycleVelocityTracker() {if (velocityTracker != null) {velocityTracker.recycle();velocityTracker = null;}}/** * 获取X方向的滑动速度,大于0向右滑动，反之向左 * * @return */private int getScrollVelocity() {velocityTracker.computeCurrentVelocity(1000);int velocity = (int) velocityTracker.getXVelocity();return velocity;}public void setHasHeadView(Boolean hasHeadView) {this.hasHeadView = hasHeadView;}public void setHasFootView(Boolean hasFootView) {this.hasFootView = hasFootView;}}在ListViewCompat.java文件中重写了dispatchTouchEvent函数，在其中判断了是否点击滑动区域是有效位置，以及判断是否横向滑动，如果该ListView添加了HeadView、FootView，可将hasHeadView、hasFootView设置为true，则其所在区域为无效位置。然后在函数onTouchEvent中根据判断条件判断是否将Event事件传递给SlideView，如果满足条件，则有SlideView处理滑动事件。
此处加入mLastSlideViewWithStatusOn记录上一次打开状态的View，当用户单击时，应判断当前是否有Item处于SLIDE_STATUS_ON的状态，若有则将Event事件传递给SlideView处理，否则交给super.onTouchEvent(event)处理，则响应OnItemClick事件。
SlideView.java
package com.ryg.slideview;import android.content.Context;import android.util.AttributeSet;import android.util.Log;import android.util.TypedValue;import android.view.MotionEvent;import android.view.View;import android.widget.LinearLayout;import android.widget.RelativeLayout;import android.widget.Scroller;import android.widget.TextView;public class SlideView extends LinearLayout { private static final String TAG = "SlideView"; private Context mContext; // 用来放置所有view的容器 private LinearLayout mViewContent; // 用来放置内置view的容器，比如删除 按钮 private RelativeLayout mHolder; // 弹性滑动对象，提供弹性滑动效果 private Scroller mScroller; // 滑动回调接口，用来向上层通知滑动事件 private OnSlideListener mOnSlideListener; // 内置容器的宽度 单位：dp private int mHolderWidth = 120; // 分别记录上次滑动的坐标 private int mLastX = 0; private int mLastY = 0; // 用来控制滑动角度，仅当角度a满足如下条件才进行滑动：tan a = deltaX / deltaY > 2 private static final int TAN = 2; // 控制是否可以滑动 private boolean isScrollEnable = true; // 记录当前SlideView的状态 private int slideStatus = OnSlideListener.SLIDE_STATUS_OFF; public interface OnSlideListener { // SlideView的三种状态：开始滑动，打开，关闭 public static final int SLIDE_STATUS_OFF = 0; public static final int SLIDE_STATUS_START_SCROLL = 1; public static final int SLIDE_STATUS_ON = 2; /** * @param view * current SlideView * @param status * SLIDE_STATUS_ON, SLIDE_STATUS_OFF or * SLIDE_STATUS_START_SCROLL */ public void onSlide(View view, int status); } public SlideView(Context context) { super(context); initView(); } public SlideView(Context context, AttributeSet attrs) { super(context, attrs); initView(); } private void initView() { mContext = getContext(); // 初始化弹性滑动对象 mScroller = new Scroller(mContext); // 设置其方向为横向 setOrientation(LinearLayout.HORIZONTAL); // 将slide_view_merge加载进来 View.inflate(mContext, R.layout.slide_view_merge, this); mViewContent = (LinearLayout) findViewById(R.id.view_content); mHolderWidth = Math.round(TypedValue.applyDimension( TypedValue.COMPLEX_UNIT_DIP, mHolderWidth, getResources() .getDisplayMetrics())); } // 设置按钮的内容，也可以设置图标啥的，我没写 public void setButtonText(CharSequence text) { ((TextView)findViewById(R.id.delete)).setText(text); } // 将view加入到ViewContent中 public void setContentView(View view) { mViewContent.addView(view); } // 设置滑动回调 public void setOnSlideListener(OnSlideListener onSlideListener) { mOnSlideListener = onSlideListener; } // 将当前状态置为关闭 public void shrink() { if (getScrollX() != 0) { this.smoothScrollTo(0, 0); if (mOnSlideListener != null) { mOnSlideListener.onSlide(this, OnSlideListener.SLIDE_STATUS_OFF); slideStatus = OnSlideListener.SLIDE_STATUS_OFF; } } } // 根据MotionEvent来进行滑动，这个方法的作用相当于onTouchEvent // 如果你不需要处理滑动冲突，可以直接重命名，照样能正常工作 public void onRequireTouchEvent(MotionEvent event) { if (!isScrollEnable) {return;} int x = (int) event.getX(); int y = (int) event.getY(); int scrollX = getScrollX(); Log.d(TAG, "x=" + x + " y=" + y); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: { if (!mScroller.isFinished()) { mScroller.abortAnimation(); } if (mOnSlideListener != null) { mOnSlideListener.onSlide(this, OnSlideListener.SLIDE_STATUS_START_SCROLL); } break; } case MotionEvent.ACTION_MOVE: { int deltaX = x - mLastX; int deltaY = y - mLastY; if (Math.abs(deltaX) < 5) {return;} if (mOnSlideListener != null) { mOnSlideListener.onSlide(this, OnSlideListener.SLIDE_STATUS_START_SCROLL); slideStatus = OnSlideListener.SLIDE_STATUS_START_SCROLL; } if (Math.abs(deltaX) < Math.abs(deltaY) * TAN) { // 滑动不满足条件，不做横向滑动 break; } // 计算滑动终点是否合法，防止滑动越界 int newScrollX = scrollX - deltaX; if (deltaX != 0) { if (newScrollX < 0) { newScrollX = 0; } else if (newScrollX > mHolderWidth) { newScrollX = mHolderWidth; } this.scrollTo(newScrollX, 0); } break; } case MotionEvent.ACTION_UP: { int newScrollX = 0; // 这里做了下判断，当松开手的时候，会自动向两边滑动，具体向哪边滑，要看当前所处的位置 if (scrollX - mHolderWidth * 0.75 > 0) { newScrollX = mHolderWidth; } // 慢慢滑向终点 this.smoothScrollTo(newScrollX, 0); // 通知上层滑动事件 if (mOnSlideListener != null) { mOnSlideListener.onSlide(this, newScrollX == 0 ? OnSlideListener.SLIDE_STATUS_OFF : OnSlideListener.SLIDE_STATUS_ON); slideStatus = newScrollX == 0 ? OnSlideListener.SLIDE_STATUS_OFF : OnSlideListener.SLIDE_STATUS_ON; } break; } default: break; } mLastX = x; mLastY = y; } private void smoothScrollTo(int destX, int destY) { // 缓慢滚动到指定位置 int scrollX = getScrollX(); int delta = destX - scrollX; // 以三倍时长滑向destX，效果就是慢慢滑动 mScroller.startScroll(scrollX, 0, delta, 0, Math.abs(delta) * 3); invalidate(); } @Override public void computeScroll() { if (mScroller.computeScrollOffset()) { scrollTo(mScroller.getCurrX(), mScroller.getCurrY()); postInvalidate(); } }public void setScrollEnable(boolean isScrollEnable) {this.isScrollEnable = isScrollEnable;}public int getSlideStatus() {return slideStatus;} }此处加入slideStatus是为了记录当前View的状态，以供其他地方调用判断。MainActivity.java
package com.ryg.slideview;import java.util.ArrayList;import java.util.List;import com.ryg.slideview.SlideView.OnSlideListener;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity implements OnItemClickListener, OnClickListener, OnSlideListener { private static final String TAG = "MainActivity"; private ListViewCompat mListView; private List<MessageItem> mMessageItems = new ArrayList<MainActivity.MessageItem>(); // 上次处于打开状态的SlideView private SlideView mLastSlideViewWithStatusOn; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); } private void initView() { mListView = (ListViewCompat) findViewById(R.id.list); for (int i = 0; i < 20; i++) { MessageItem item = new MessageItem(); if (i % 3 == 0) { item.iconRes = R.drawable.default_qq_avatar; item.title = "腾讯新闻"; item.msg = "青岛爆炸满月：大量鱼虾死亡"; item.time = "晚上18:18"; } else { item.iconRes = R.drawable.wechat_icon; item.title = "微信团队"; item.msg = "欢迎你使用微信"; item.time = "12月18日"; } mMessageItems.add(item); } mListView.setAdapter(new SlideAdapter()); mListView.setOnItemClickListener(this); } private class SlideAdapter extends BaseAdapter { private LayoutInflater mInflater; SlideAdapter() { super(); mInflater = getLayoutInflater(); } @Override public int getCount() { return mMessageItems.size(); } @Override public Object getItem(int position) { return mMessageItems.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder; SlideView slideView = (SlideView) convertView; if (slideView == null) { // 这里是我们的item View itemView = mInflater.inflate(R.layout.list_item, null); slideView = new SlideView(MainActivity.this); // 这里把item加入到slideView slideView.setContentView(itemView); // 下面是做一些数据缓存 holder = new ViewHolder(slideView); slideView.setOnSlideListener(MainActivity.this); slideView.setTag(holder); } else { holder = (ViewHolder) slideView.getTag(); } MessageItem item = mMessageItems.get(position); item.slideView = slideView; item.slideView.shrink(); holder.icon.setImageResource(item.iconRes); holder.title.setText(item.title); holder.msg.setText(item.msg); holder.time.setText(item.time); holder.deleteHolder.setOnClickListener(MainActivity.this); return slideView; } } public class MessageItem { public int iconRes; public String title; public String msg; public String time; public SlideView slideView; } private static class ViewHolder { public ImageView icon; public TextView title; public TextView msg; public TextView time; public ViewGroup deleteHolder; ViewHolder(View view) { icon = (ImageView) view.findViewById(R.id.icon); title = (TextView) view.findViewById(R.id.title); msg = (TextView) view.findViewById(R.id.msg); time = (TextView) view.findViewById(R.id.time); deleteHolder = (ViewGroup)view.findViewById(R.id.holder); } } @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // 这里处理ListItem的点击事件 Log.e(TAG, "onItemClick position=" + position); Toast.makeText(this, "onItemClick position=" + position, Toast.LENGTH_SHORT).show(); } @Override public void onSlide(View view, int status) { // 如果当前存在已经打开的SlideView，那么将其关闭 if (mLastSlideViewWithStatusOn != null && mLastSlideViewWithStatusOn != view) { mLastSlideViewWithStatusOn.shrink(); } // 记录本次处于打开状态的view if (status == SLIDE_STATUS_ON) { mLastSlideViewWithStatusOn = (SlideView) view; } } @Override public void onClick(View v) { // 这里处理删除按钮的点击事件，可以删除对话 if (v.getId() == R.id.holder) { Log.e(TAG, "onClick v=" + v); Toast.makeText(this, "onClick Delete", Toast.LENGTH_SHORT).show(); } }} 0 0
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