前言

用过微信的都知道。微信对话列表滑动删除效果是非常不错的，这个效果我们也能够有。

思路事实上非常easy，弄个ListView。然后里面的每一个item做成一个能够滑动的自己定义控件就可以。由于ListView是上下滑动而item是左右滑动，因此会有滑动冲突。或许你须要了解下android中点击事件的派发流程，请參考Android源代码分析-点击事件派发机制。我的解决思路是这种：重写ListView的onInterceptTouchEvent方法，在move的时候做推断，假设是左右滑动就返回false。否则返回true；重写SlideView（即自己定义item控件）的onTouchEvent方法来处理滑动。

整个思路没有问题。滑动冲突也攻克了，但是ListView无法得到焦点了，也就是ListView无法处理点击事件了。让我们回忆下问题出在哪里：我的理解是这种。上述处理滑动本身没有问题，但是有一个副作用。就是会让外层View失去焦点且无法处理点击事件。

常见的滑动冲突场景。比方launcher内部嵌入ListView却是没有问题的，由于这个时候launcher不须要获得焦点，须要获得焦点的是内部的ListView。

因此，上述处理方式对于外部须要获得焦点的情况（比方外部是ListView）就不太适合了。于是我就和ttdevs探讨，发现他採用了第二种思路。我从来没有想过还能够这样玩。以下介绍他的思路。

新的思路

不考虑那么复杂，不採用主流玩法，全部的事件均由外层的ListView做拦截，同一时候把事件传递给SlideView做滑动，这样的实现的确能够达到效果，并且代码非常easy，根本不须要处理什么复杂的滑动冲突。

效果

以下分别为微信和高仿效果

代码分析

先看SlideView是怎样实现的

看layout xml：

<com.macc.firstsecretary_UI.ListViewCompatandroid:id="@+id/list"android:layout_width="match_parent"android:layout_height="match_parent"android:background="#fff4f7f9"android:cacheColorHint="#00000000"android:divider="#dddbdb"android:dividerHeight="1.0px"android:drawSelectorOnTop="false"android:listSelector="@android:color/transparent"android:scrollbars="none" />

再看com.macc.firstsecretary_UI.ListViewCompat类的代码：

private static final String TAG = "ListViewCompat";private SlideView mFocusedItemView;public ListViewCompat(Context context) {super(context);}public ListViewCompat(Context context, AttributeSet attrs) {super(context, attrs);}public ListViewCompat(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();}}}@Overridepublic 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) {Message data = (Message) getItemAtPosition(position);mFocusedItemView = data.getSlideView();Log.e(TAG, "FocusedItemView=" + mFocusedItemView);}}default:break;}if (mFocusedItemView != null) {mFocusedItemView.onRequireTouchEvent(event);}return true;}

再看SlideView.java：

public class SlideView extends LinearLayout {private static final String TAG = "SlideView";private Context mContext;private LinearLayout mViewContent;private RelativeLayout mHolder;private Scroller mScroller;private OnSlideListener mOnSlideListener;private int mHolderWidth = 120;private int mLastX = 0;private int mLastY = 0;private static final int TAN = 2;private  boolean isScroller=false;//是否已经滑动public interface OnSlideListener {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 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);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()));}public void setButtonText(CharSequence text) {((TextView)findViewById(R.id.delete)).setText(text);}public void setContentView(View view) {mViewContent.addView(view);}public void setOnSlideListener(OnSlideListener onSlideListener) {mOnSlideListener = onSlideListener;}public void shrink() {if (getScrollX() != 0) {this.smoothScrollTo(0, 0);}}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) {break;}int newScrollX = scrollX - deltaX;if (deltaX != 0) {if(isScroller){this.shrink();}else{if (newScrollX < 0) {newScrollX = 0;} else if (newScrollX > mHolderWidth) {newScrollX = mHolderWidth;}this.scrollTo(newScrollX, 0);}}break;}case MotionEvent.ACTION_UP: {int newScrollX = 0;if (scrollX - mHolderWidth * 0.75 > 0) {newScrollX = mHolderWidth;}if(isScroller){this.shrink();isScroller=false;}else{this.smoothScrollTo(newScrollX, 0);if (mOnSlideListener != null) {mOnSlideListener.onSlide(this,newScrollX == 0 ?

OnSlideListener.SLIDE_STATUS_OFF : OnSlideListener.SLIDE_STATUS_ON); } isScroller=true; } 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; mScroller.startScroll(scrollX, 0, delta, 0, Math.abs(delta) * 3); invalidate(); } @Override public void computeScroll() { if (mScroller.computeScrollOffset()) { scrollTo(mScroller.getCurrX(), mScroller.getCurrY()); postInvalidate(); } }

上述代码做了非常具体的说明，这就是滑动控件的完整代码，大家要明确的是：你所加入的view都是加在SlideView的子View : view_content中的，而不是直接加在SlideView中，仅仅有这样我们才方便做滑动效果。

最后一步我们来看看适配器里面的代码：

public class Carpa_MySelf_MessageCenterAdapter extends BaseAdapter implements OnSlideListener,OnClickListener{private LayoutInflater inflater;private List<Message> messages;private Context context;private SlideView mSlideView;private int position;//删除位置数据private Handler handler;public Carpa_MySelf_MessageCenterAdapter(Context context,ArrayList<Message> messages,Handler handler){setData(messages);this.context=context;inflater=LayoutInflater.from(context);this.handler=handler;}public void setData(ArrayList<Message> messages){if(messages==null){this.messages=new ArrayList<Message>();}else{this.messages=messages;}}public void setPosition(int position){this.position=position;}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn messages.size();}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn messages.get(position);}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ViewHolder holder;SlideView slideView = (SlideView) convertView;if (slideView == null) {View itemView = inflater.inflate(R.layout.carpa_myself_message_center_item, null);slideView = new SlideView(context);slideView.setContentView(itemView);holder = new ViewHolder(slideView);slideView.setOnSlideListener(Carpa_MySelf_MessageCenterAdapter.this);slideView.setTag(holder);} else {holder = (ViewHolder) slideView.getTag();}Message msgMessage=messages.get(position);msgMessage.setSlideView(slideView);msgMessage.getSlideView().shrink();String sourceString=msgMessage.getSourceStr();holder.tvContent.setText("内容:"+msgMessage.getContentStr());holder.tvTime.setText(UtilTools.fromatDate(msgMessage.getTimeStr()));holder.deleteHolder.setOnClickListener(Carpa_MySelf_MessageCenterAdapter.this);if(sourceString.equals("Traffic")){holder.tvSource.setText("信息来源:66");holder.iView.setBackgroundResource(R.drawable.carpa_wz);}else if(sourceString.equals("DaiJia")){holder.tvSource.setText("信息来源:99");holder.iView.setBackgroundResource(R.drawable.car_deldrive);}else if(sourceString.equals("Nianjian")){holder.tvSource.setText("信息来源:33");holder.iView.setBackgroundResource(R.drawable.car_yearcheck);}else if(sourceString.equals("JiaSZ")){holder.tvSource.setText("信息来源:88");holder.iView.setBackgroundResource(R.drawable.car_zjbl);}else if(sourceString.equals("HKJiaSZ")){holder.tvSource.setText("信息来源:11");holder.iView.setBackgroundResource(R.drawable.car_hongkong);}return slideView;}class ViewHolder {public ImageView iView;public TextView tvSource;public TextView tvTime;public TextView tvContent;public ViewGroup deleteHolder;ViewHolder(View view) {iView=(ImageView)view.findViewById(R.id.message_center_iv);tvSource = (TextView) view.findViewById(R.id.message_center_source);tvTime = (TextView) view.findViewById(R.id.message_center_time);tvContent = (TextView) view.findViewById(R.id.message_center_content);deleteHolder = (ViewGroup)view.findViewById(R.id.holder);}}@Overridepublic void onClick(View v) {// TODO Auto-generated method stubif (v.getId() == R.id.holder) {Log.e("info", "onClick v=" + v);
//            messages.remove(position);
//            this.notifyDataSetChanged();handler.sendEmptyMessage(Tab_MySelf_MessageCenter.HANDLER_DELETE);}}@Overridepublic void onSlide(View view, int status) {// TODO Auto-generated method stubif (mSlideView != null && mSlideView != view) {mSlideView.shrink();}if (status == SLIDE_STATUS_ON) {mSlideView = (SlideView) view;}}

代码已贴完成！

仅供參考,谢谢！