Android - 圖庫中的ScrollView

因此，目標是在圖庫中使滾動視圖正確運行。我使用的是發表atraudes一個例子，你可以看到如下：Android - 圖庫中的ScrollView

public class GalleryFriendlyScrollView extends ScrollView{ 
    private static int NONE = -1; 
    private static int DOSCROLLVIEW = 0; 
    private static int DOGALLERY = 1; 

    private float lastx = 0; 
    private float lasty = 0; 
    private float firstx = 0; 
    private float firsty = 0; 
    private float lastRawx = 0; 
    private float lastRawy = 0; 
    private int gestureRecipient = NONE; 
    private boolean donewithclick = true; 
    private Gallery parent = null; 
    private boolean firstclick = true; 

    public GalleryFriendlyScrollView(Context context, AttributeSet attrs) { 
     super(context, attrs); 
    } 

    @Override 
    public boolean onTouchEvent(MotionEvent ev) { 
     boolean retthis = true; 
     //Indicating a fresh click 
     if(donewithclick){ 
      firstx = ev.getX(); 
      firsty = ev.getY(); 
      lastx = firstx; 
      lasty = firsty; 
      lastRawx = ev.getRawX(); 
      lastRawy = ev.getRawY(); 
      donewithclick = false; 
      firstclick = true; 
     } 
     //We don't know where these gesture events are supposed to go to. 
     //We have movement on the x and/or why axes, so we can determine where they should go now. 
     if((gestureRecipient == NONE) && (lastx != ev.getX() || lasty != ev.getY())){ 
      //Determine whether there's more movement vertically or horizontally 
      float xdiff = ev.getX() - lastx; 
      float ydiff = ev.getY() - lasty; 
      if(xdiff < 0)xdiff = xdiff * -1; 
      if(ydiff < 0)ydiff = ydiff * -1; 
      if((xdiff) > (ydiff)){ 
       gestureRecipient = DOGALLERY; 
      } else { 
       gestureRecipient = DOSCROLLVIEW; 
      } 
     } 
     if(gestureRecipient == DOGALLERY){ 
      if(!firstclick){ 
       //After you drag the screen left or right a bit, the baseline for where it calculates 
       //x and y from changes, so we need to adjust the offset to our original baseline 
       float offsetx = (((ev.getX() - lastx) - (ev.getRawX() - lastRawx)) * -1); 
       float offsety = (((ev.getY() - lasty) - (ev.getRawY() - lastRawy)) * -1); 
       ev.offsetLocation(offsetx, offsety); 
      } 
      retthis = getGallery().onTouchEvent(ev); 
      Log.i("TAG", "gallery"); 
      firstclick = false; 
     } else if(gestureRecipient == DOSCROLLVIEW){ 
      retthis = super.onTouchEvent(ev); //FIXME This isn't actually scrolling 
      Log.i("TAG", "scroll"); 
     } 
     if(ev.getAction() == MotionEvent.ACTION_UP){ 
      //User's finger has been lifted 
      if(((firstx == ev.getX()) && (firsty == ev.getY()))){ 
       //Since there isn't any movement in either direction, it's a click 
       getGallery().onSingleTapUp(ev); 
       super.onTouchEvent(ev); 
      } 
      donewithclick = true; 
      gestureRecipient = NONE; 
      Log.i("TAG", "END"); 
     } 
     //And record our coordinate data 
     lastx = ev.getX(); 
     lasty = ev.getY(); 
     lastRawx = ev.getRawX(); 
     lastRawy = ev.getRawY(); 
     return retthis; 
    } 

    @Override 
    public boolean onInterceptTouchEvent(MotionEvent ev) { 
     getGallery().onTouchEvent(ev); 
     return super.onInterceptTouchEvent(ev); 
    } 

    private Gallery getGallery(){ 
     //Gets the gallery 
     if(parent == null) 
      parent = (Gallery) (this.getParent().getParent()); 
     return parent; 
    } 
}

這似乎是捕獲所有基於我附加日誌消息的正確的情況下（水平，垂直和無），但對於某些原因在onTouchEvent（MotionEvent ev）中調用super.onTouchEvent（ev）時，滾動視圖不會滾動。

來源

2011-02-16 Chris Allen

爲什麼你不使用一個GridView？ – schwiz 2011-05-14 02:36:39