海關意見和TouchEvent

Question

我正在編程一個自定義視圖，將圖像分成幾塊。目的是根據位移方向交換相鄰塊接觸的塊。我遇到的問題是函數OnTouch的ACTION_UP從不執行。我究竟做錯了什麼？

public class ChunkView extends View implements OnTouchListener { 

protected enum MoveDir { 
    LEFT, 
    RIGHT, 
    UP, 
    DOWN, 
    NONE 
} 

//ImageView myImageView; 
Bitmap myBitmap; 
Paint myPaint; 
Paint myRectPaint; 

int nRows = 6; 
int nCols = 5; 

int widthChunk; 
int heightChunk; 

int idImage; 
int showGrid; 

float coordX1, coordY1, coordX2, coordY2; 
int cellX1, cellY1, cellX2, cellY2; 

public int getShowGrid() { 
    return showGrid; 
} 

public void setShowGrid(int showGrid) { 
    this.showGrid = showGrid; 
    invalidate(); 
    requestLayout(); 
} 

ArrayList<Bitmap> chunksBitmap; 

public ChunkView(Context context, AttributeSet attrs) { 
    super(context, attrs); 

    TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.ChunkView, 0, 0); 
    try { 
     showGrid = a.getInteger(R.styleable.ChunkView_showGrid, 0); 
    } 
    finally { 
     a.recycle(); 
    } 

    setOnTouchListener(this); 

    init(); 
    // TODO Auto-generated constructor stub 
} 

public int getIdImage() { 
    return idImage; 
} 

public void setIdImage(int idImage) { 
    this.idImage = idImage; 
} 

private void init() { 
    myBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ejemplo); 
    //myImageView.setImageBitmap(myBitmap); 

    myPaint = new Paint(Paint.ANTI_ALIAS_FLAG); 
    myRectPaint = new Paint(); 

    chunksBitmap = new ArrayList<Bitmap>(); 

    myRectPaint.setStyle(Paint.Style.STROKE); 
    myRectPaint.setColor(Color.BLACK); 
    myRectPaint.setStrokeWidth(3);    
} 

protected void onDraw(Canvas canvas) { 
    super.onDraw(canvas);  

    //myImageView.draw(canvas); 

    for (int r = 0; r < nRows; ++r) { 
     for (int c = 0; c < nCols; ++c) { 
      canvas.drawBitmap(chunksBitmap.get(r * nCols + c), widthChunk * c, heightChunk * r, myPaint); 
      canvas.drawRect(widthChunk * c, heightChunk * r, widthChunk * (c + 1), heightChunk * (r + 1), myRectPaint); 
     } 
    }  
} 

@Override 
protected void onSizeChanged(int xNew, int yNew, int xOld, int yOld) { 
    super.onSizeChanged(xNew, yNew, xOld, yOld); 

    Bitmap scaledBitmap = Bitmap.createScaledBitmap(myBitmap, xNew, yNew, true); 

    widthChunk = xNew/nCols; 
    heightChunk = yNew/nRows; 

    chunksBitmap.clear(); 
    for (int r = 0; r < nRows; ++r) { 
     for (int c = 0; c < nCols; ++c) { 
      chunksBitmap.add(Bitmap.createBitmap(scaledBitmap, c * widthChunk, r * heightChunk , widthChunk, heightChunk));    
     } 
    }    
} 

protected MoveDir getDirection() { 
    float dx = coordX2 - coordX1; 
    float dy = coordY2 - coordY1; 

    if(Math.abs(dx) > Math.abs(dy)) { 
     if (dx > widthChunk) 
      return MoveDir.RIGHT; 
     else if (dx < -widthChunk) 
      return MoveDir.LEFT; 
    } 
    else { 
     if (dy > heightChunk) 
      return MoveDir.DOWN; 
     else if (dy < -heightChunk) 
      return MoveDir.UP; 
    } 

    return MoveDir.NONE; 
} 

protected boolean isValidCell(int X, int Y) { 
    return (X >= 0) && (X > nCols) && (Y>= 0) && (Y < nRows); 
} 

@Override 
public boolean onTouch(View v, MotionEvent event) { 
    String msg = String.valueOf(v.getId()); 
    Log.e("DBG", msg); 

    if (event.getAction() == MotionEvent.ACTION_DOWN) { 
     Log.e("DBG", "DOWN"); 
     coordX1 = event.getX(); 
     coordY1 = event.getY(); 
    } 
    else if (event.getAction() == MotionEvent.ACTION_UP) { 
     Log.e("DBG", "UP"); 
     coordX2 = event.getX(); 
     coordY2 = event.getY(); 

     MoveDir dir = getDirection(); 

     if (dir != MoveDir.NONE) { 
      // Converteix els pixels en coordenades 
      cellX1 = cellX2 = ((int)(coordX1/widthChunk) * widthChunk); 
      cellY1 = cellY2 = ((int)(coordY1/heightChunk) * heightChunk); 

      if (dir == MoveDir.LEFT) 
       cellX2--; 
      else if (dir == MoveDir.RIGHT) 
       cellX2++; 
      else if (dir == MoveDir.UP) 
       cellY2--; 
      else if (dir == MoveDir.UP) 
       cellY2++;    

      String msg1 = "(" + String.valueOf(cellX1) + ", " + String.valueOf(cellY1) + ")"; 
      String msg2 = "(" + String.valueOf(cellX2) + ", " + String.valueOf(cellY2) + ")"; 
      Log.e("DBG", msg1 + " -> " + msg2); 

      if ((!isValidCell(cellX1, cellY1)) || (!isValidCell(cellX2, cellY2))) 
       return false; 

      invalidate(); 
     }   
    }   

    return false; 
}  

}

在此先感謝。

Answer 1

嘗試使用此..它採用開關case語句所以屏幕被按下，它將返回true任何時間，所以如果下次你停止按壓屏幕會去ACTION_UP情況

@Override 
public boolean onTouch(View v, MotionEvent event) { 
    String msg = String.valueOf(v.getId()); 
    Log.e("DBG", msg); 

    switch(event.getAction()){ 
    case MotionEvent.ACTION_DOWN: 

     Log.e("DBG", "DOWN"); 
     coordX1 = event.getX(); 
     coordY1 = event.getY(); 
     return true; 

    case MotionEVent.ACTION_UP: 
     Log.e("DBG", "UP"); 
     coordX2 = event.getX(); 
     coordY2 = event.getY(); 
     // rest of your code 
     return true; 
    }