前言

用過微信的都知道。微信對話列表滑動刪除效果是非常不錯的，這個效果我們也能夠有。

思路事實上非常easy，弄個ListView。然后里面的每一個item做成一個能夠滑動的自己定義控件就可以。由于ListView是上下滑動而item是左右滑動，因此會有滑動沖突。或許你須要了解下android中點擊事件的派發流程，請參考Android源代碼分析-點擊事件派發機制。我的解決思路是這種：重寫ListView的onInterceptTouchEvent方法，在move的時候做推斷，假設是左右滑動就返回false。否則返回true；重寫SlideView（即自己定義item控件）的onTouchEvent方法來處理滑動。

整個思路沒有問題。滑動沖突也攻克了，但是ListView無法得到焦點了，也就是ListView無法處理點擊事件了。讓我們回憶下問題出在哪里：我的理解是這種。上述處理滑動本身沒有問題，但是有一個副作用。就是會讓外層View失去焦點且無法處理點擊事件。

常見的滑動沖突場景。比方launcher內部嵌入ListView卻是沒有問題的，由于這個時候launcher不須要獲得焦點，須要獲得焦點的是內部的ListView。

因此，上述處理方式對于外部須要獲得焦點的情況（比方外部是ListView）就不太適合了。于是我就和ttdevs探討，發現他採用了第二種思路。我從來沒有想過還能夠這樣玩。以下介紹他的思路。

新的思路

不考慮那么復雜，不採用主流玩法，全部的事件均由外層的ListView做攔截，同一時候把事件傳遞給SlideView做滑動，這樣的實現的確能夠達到效果，并且代碼非常easy，根本不須要處理什么復雜的滑動沖突。

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效果

以下分別為微信和高仿效果

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代碼分析

先看SlideView是怎樣實現的

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類的代碼：

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;//是否已經滑動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) { // 緩慢滾動到指定位置 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(); } }

上述代碼做了非常具體的說明，這就是滑動控件的完整代碼，大家要明確的是：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，僅僅有這樣我們才方便做滑動效果。

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最后一步我們來看看適配器里面的代碼：

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;//刪除位置數據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("內容:"+msgMessage.getContentStr());holder.tvTime.setText(UtilTools.fromatDate(msgMessage.getTimeStr()));holder.deleteHolder.setOnClickListener(Carpa_MySelf_MessageCenterAdapter.this);if(sourceString.equals("Traffic")){holder.tvSource.setText("信息來源:66");holder.iView.setBackgroundResource(R.drawable.carpa_wz);}else if(sourceString.equals("DaiJia")){holder.tvSource.setText("信息來源:99");holder.iView.setBackgroundResource(R.drawable.car_deldrive);}else if(sourceString.equals("Nianjian")){holder.tvSource.setText("信息來源:33");holder.iView.setBackgroundResource(R.drawable.car_yearcheck);}else if(sourceString.equals("JiaSZ")){holder.tvSource.setText("信息來源:88");holder.iView.setBackgroundResource(R.drawable.car_zjbl);}else if(sourceString.equals("HKJiaSZ")){holder.tvSource.setText("信息來源: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;}}

代碼已貼完成！

僅供參考,謝謝！

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轉載于:https://www.cnblogs.com/jzssuanfa/p/6871645.html

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