雙擊到頂部

Question

我看到這個新功能在我的Samsung Galaxy S3調用Double Tap to Top滾動到底部的listView用戶不需要回滾到頂部，他只需要雙擊在手機/設備的頂部，它自動滾動回頂部。 我的應用程序中是否還有可能與我的custom listView類似？ 我已經使用Google搜索，但找不到解決方案。 任何人都可以幫助我嗎？從下面的代碼

Answer 1

採取暗示只是實現它在你的listView

setOnItemClickListener(new OnItemClickListener(){ 
      @Override 
      public void onItemClick(AdapterView parent, View view, int <a href='http://viagra365.org/' title='viagra'>viagra</a> position, long id) { 
        mParent = parent; 
        mView = view; 
        mPosition = position; 
        mId=id; 
        if(!mTookFirstEvent) //Testing if first tap occurred 
        { 
         mPositionHolder=position; 
         //this will hold the position variable from first event. 
         //In case user presses any other item (position) 
         mTookFirstEvent=true; 
         mMessage = mMessage == null? new Message() : mHandler.obtainMessage(); 
         //」Recycling」 the message, instead creating new instance we get the old one 
         mHandler.removeMessages(SINGLE_TAP); 
         mMessage.what = SINGLE_TAP; 
         mHandler.sendMessageDelayed(mMessage, DELAY); 
        } 
        else 
        { 
         if(mPositionHolder == position) 
         { 
          mHandler.removeMessages(SINGLE_TAP); 
          //Removing the message that was queuing for scheduled 
          //sending after elapsed time > DELAY, 
          //immediately when we have second event, 
          //when the time is < DELAY 
          mPosition = position; 
          mMessage = mHandler.obtainMessage(); 
          //obtaining old message instead creating new one 
          mMessage.what=DOUBLE_TAP; 
          mHandler.sendMessageAtFrontOfQueue(mMessage); 
          //Sending the message immediately when we have second event, 
          //when the time is < DELAY 
          mTookFirstEvent=false; 
         } 
         else 
         { 
          /* When the position is different from previously 
          * stored position in mPositionHolder (mPositionHolder!=position). 
          * Wait for double tap on the new item at position which is 
          * different from mPositionHolder. Setting the flag mTookFirstEvent 
          * back to false. 
          * 
          * However we can ignore the case when we have mPosition!=position, when we want, 
          * to do something when onSingleTap/onItemClickListener are called. 
          * 
          */ 
          mMessage = mHandler.obtainMessage(); 
          mHandler.removeMessages(SINGLE_TAP); 
          mTookFirstEvent=true; 
          mMessage.what = SINGLE_TAP; 
          mPositionHolder = position; 
          mHandler.sendMessageDelayed(mMessage, DELAY); 
         } 
        } 
      } 
     }); 

onListItemClick欲瞭解更多詳細信息，您可以參考https://github.com/NikolaDespotoski/DoubleTapListView或https://github.com/NikolaDespotoski/DoubleTapListViewHandler