Android高仿微信对话列表滑动删除效果

<?xml version="1.0" encoding="utf-8"?><merge xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent" >  <LinearLayout    android:id="@+id/view_content"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="horizontal" >  </LinearLayout>  <RelativeLayout    android:id="@+id/holder"    android:layout_width="120dp"    android:layout_height="match_parent"    android:clickable="true"    android:background="@drawable/holder_bg">    <TextView      android:id="@+id/delete"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:drawableLeft="@drawable/del_icon_normal"      android:layout_centerInParent="true"      android:gravity="center"      android:textColor="@color/floralwhite"      android:text="删除" />  </RelativeLayout></merge>

 /** * SlideView 继承自LinearLayout */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;  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);    }  }  // 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) {    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) < 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);      }      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();    }  }}

  @Override  public boolean onTouchEvent(MotionEvent event) {    switch (event.getAction()) {    case MotionEvent.ACTION_DOWN: {      int x = (int) event.getX();      int y = (int) event.getY();      //我们想知道当前点击了哪一行      int position = pointToPosition(x, y);      Log.e(TAG, "postion=" + position);      if (position != 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(position);        mFocusedItemView = data.slideView;        Log.e(TAG, "FocusedItemView=" + mFocusedItemView);      }    }    default:      break;    }    //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 (mFocusedItemView != null) {      mFocusedItemView.onRequireTouchEvent(event);    }    return super.onTouchEvent(event);  }

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>();  private SlideAdapter mSlideAdapter;  // 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);    }    mSlideAdapter = new SlideAdapter();    mListView.setAdapter(mSlideAdapter);    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);  }  @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) {      int position = mListView.getPositionForView(v);      if (position != ListView.INVALID_POSITION) {        mMessageItems.remove(position);        mSlideAdapter.notifyDataSetChanged();      }      Log.e(TAG, "onClick v=" + v);    }  }}