仿微信ListView item左右滑动
来源：互联网 发布：超级淘宝系统小说手机 编辑：程序博客网 时间：2024/04/29 21:04
已经在各大论坛潜水两年多时间了，看了无数博客，有的博客写的确实不错，但是发现转载的太多了!本想写点东西来记录自己的成长，由于比较懒，没坚持下去!最近做项目发现之前的好东西都忘记了！哎，不说了，以后还是要养成个做笔记的习惯.今天跟大家分享一个仿微信的ListView item左右滑动，之前在别的论坛看到有人写过，但是只支持左滑，没有支持右滑动，先来张图片看看吧：
以下是核心代码:
自定义的滑动View：
/**滑动view*/public class SlideView extends LinearLayout {private static final String TAG = SlideView.class.getSimpleName();private Context mContext;private LinearLayout mViewContent;/*** 速度跟踪类*/private VelocityTracker mVelocityTracker;/*** 滑动类*/private Scroller mScroller;/*** 滑动状态监听器*/private OnSlideListener mOnSlideListener;/*** 删除按钮的宽度*/private int mHolderWidth = 120;private int mLastX = 0;private int mLastY = 0;private static final int TAN = 2;/*** 自定义回调接口*/public interface OnSlideListener {//关闭public static final int SLIDE_STATUS_OFF = 0;//开始public static final int SLIDE_STATUS_START_SCROLL = 1;//启动public static final int SLIDE_STATUS_ON = 2;/*** @param view current SlideView* @param status SLIDE_STATUS_ON or SLIDE_STATUS_OFF*/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();mScroller = new Scroller(mContext);setOrientation(LinearLayout.HORIZONTAL);//初始化布局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()));Log.d(TAG,"mHolderWidth="+mHolderWidth);}/*** 设置右边内容* @param text*/public void setRightText(CharSequence text) {((TextView) findViewById(R.id.delete)).setText(text);}/*** 设置左边内容* @param text*/public void setLeftText(CharSequence text){((TextView)findViewById(R.id.stick)).setText(text);}/*** 设置中间内容* @param view*/public void setContentView(View view) {mViewContent.addView(view);}/*** 设置监听器* @param onSlideListener*/public void setOnSlideListener(OnSlideListener onSlideListener) {this.mOnSlideListener = onSlideListener;}public void shrink() {//得到偏移量if (getScrollX() != 0) {this.smoothScrollTo(0, 0);}}/*** 事件处理* @param event*/public void onRequireTouchEvent(MotionEvent event) {addVelocityTracker(event);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: {//判断是否滑动完成if (!mScroller.isFinished()) {mScroller.abortAnimation();}if (mOnSlideListener != null) {//设置滑动状态mOnSlideListener.onSlide(this,OnSlideListener.SLIDE_STATUS_START_SCROLL);}break;}case MotionEvent.ACTION_MOVE: {getScrollVelocity();int deltaX = x - mLastX;int deltaY = y - mLastY;if (Math.abs(deltaX) < Math.abs(deltaY) * TAN) {break;}int newScrollX = scrollX - deltaX;//判断滑动距离if (deltaX != 0) {if (newScrollX < 0) {newScrollX = 0;} else if (newScrollX > mHolderWidth) {newScrollX = mHolderWidth;}//赋值this.scrollTo(newScrollX, 0);}break;}case MotionEvent.ACTION_UP: {int newScrollX = mHolderWidth;/*** 判断滑动方向*/if (getScrollVelocity()<0){this.smoothScrollTo(newScrollX, 0);}else if(getScrollVelocity()>0){this.smoothScrollTo(-newScrollX, 0);}else{this.smoothScrollTo(0, 0);}if (mOnSlideListener != null) {mOnSlideListener.onSlide(this,newScrollX == 0 ? OnSlideListener.SLIDE_STATUS_OFF: OnSlideListener.SLIDE_STATUS_ON);}recycleVelocityTracker();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;Log.d(TAG,"scrollX="+scrollX+", delta="+delta);mScroller.startScroll(scrollX, 0, delta, 0, Math.abs(delta) * 3);invalidate();}/*** 添加用户的速度跟踪器** @param event*/private void addVelocityTracker(MotionEvent event) {if (mVelocityTracker == null) {mVelocityTracker = VelocityTracker.obtain();}mVelocityTracker.addMovement(event);}/*** 移除用户速度跟踪器*/private void recycleVelocityTracker() {if (mVelocityTracker != null) {mVelocityTracker.recycle();mVelocityTracker = null;}}// 获取X方向的滑动速度,大于0向右滑动，反之向左,等于0没有滑动,点击时返回0private int getScrollVelocity(){mVelocityTracker.computeCurrentVelocity(1000);int velocity=(int)mVelocityTracker.getXVelocity();Log.i(TAG, "velocity=" + velocity);return velocity;}/*** 重写computeScroll重新绘制*/@Overridepublic void computeScroll() {if (mScroller.computeScrollOffset()) {scrollTo(mScroller.getCurrX(), mScroller.getCurrY());postInvalidate();}}重写ListView:
/** * 自定义ListView * @author wuhezhi */public class SlideDeleteListView extends ListView { private static final String TAG = SlideDeleteListView.class.getSimpleName(); private SlideView mFocusedItemView; public SlideDeleteListView(Context context) { super(context); } public SlideDeleteListView(Context context, AttributeSet attrs) { super(context, attrs); } public SlideDeleteListView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } public void shrinkListItem(int position) { View item = getChildAt(position); if (item != null) { try { ((SlideView) item).shrink(); } catch (ClassCastException e) { e.printStackTrace(); } } } /** * 重写onTouchEvent事件 * * @param event * @return */ @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: { int x = (int) event.getX(); int y = (int) event.getY(); int position = pointToPosition(x, y); Log.e(TAG, "postion=" + position); if (position != INVALID_POSITION) { MessageItem data = (MessageItem) getItemAtPosition(position); mFocusedItemView = data.slideView; Log.e(TAG, "FocusedItemView=" + mFocusedItemView.toString()); } } default: break; } if (mFocusedItemView != null) { mFocusedItemView.onRequireTouchEvent(event); } return super.onTouchEvent(event); }}程序入口:
public class MainActivity extends Activity implements View.OnClickListener, AdapterView.OnItemClickListener { private static final String TAG = MainActivity.class.getSimpleName(); /** * 上下文对象 */ private Context mContext; /** * 自定义ListView */ private SlideDeleteListView mListView; /** * 集合item */ private List<MessageItem> mMessageItems = new ArrayList<MessageItem>(); /** * 右边侧滑 的View */ private SlideView mLastSlideViewWithStatusOn; /** * 适配器 */ private SlideAdapter adapter; /** * 当前删除点 */ private int position; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main3); mContext = this; init(); } private void init() { findViewById(); initData(); initListView(); } /** * 初始化控件 */ private void findViewById() { mListView = (SlideDeleteListView) findViewById(R.id.list); } /** * 初始化数据 */ private void initData() { for (int i = 0; i < 3; i++) { MessageItem item = new MessageItem(); if (i % 3 == 0) { item.iconRes = R.drawable.ic_launcher; 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.ic_launcher; item.title = "微信团队"; item.msg = "欢迎你使用微信"; item.time = "12月18日"; } mMessageItems.add(item); } } /** * 初始化ListView */ private void initListView() { adapter = new SlideAdapter(); mListView.setAdapter(adapter); mListView.setOnItemClickListener(this); } @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Log.e(TAG, "onItemClick position=" + position); } @Override public void onClick(View v) { if (v.getId() == R.id.holder_right) { Log.e(TAG, "onClick v=" + v); mMessageItems.remove(position); adapter.notifyDataSetChanged(); Toast.makeText(this, "delete", Toast.LENGTH_SHORT).show(); } } /** * ListView适配器 */ private class SlideAdapter extends BaseAdapter implements SlideView.OnSlideListener { 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) { View itemView = mInflater.inflate(R.layout.list_item, null); slideView = new SlideView(mContext); slideView.setContentView(itemView); slideView.setRightText("点击删除"); holder = new ViewHolder(slideView); slideView.setOnSlideListener(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); MainActivity.this.position = position; return slideView; } @Override public void onSlide(View view, int status) { if (mLastSlideViewWithStatusOn != null && mLastSlideViewWithStatusOn != view) { mLastSlideViewWithStatusOn.shrink(); } if (status == SLIDE_STATUS_ON) { mLastSlideViewWithStatusOn = (SlideView) view; } } } private static class ViewHolder { public ImageView icon; public TextView title; public TextView msg; public TextView time; public ViewGroup deleteHolder,stickHolder; 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_right); stickHolder=(ViewGroup)view.findViewById(R.id.holder_left); } } 第一次写博客，还不是很顺手，望各位前辈吐槽，小伙子我继续加油!对于代码有可以优化的地方望各位大年指点!下面是源码下载地址:
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