Android SDK獲取點擊圖片

Question

我有一個ImageView，但我怎麼能看到用戶有點擊/觸及在圖像上。

我知道我必須使用MotionEvent.getX()和MotionEvent.getY()，但是如何查看用戶點擊圖像的位置？

謝謝！

Answer 1

您必須對圖像視圖進行子類化，並在用戶觸摸的位置明確繪製指示器。

public class TouchableImageView extends ImageView { 

    // Constructors should come here 

    // Override onTouch to remember the touch position in our variable touchLocation 
    // Set touchLocation to null when getting the ACTION_UP event 

    // Override onDraw to draw something at touchLocation. You should create a proper Paint object 
    // in your constructors and use it here 
    public void onDraw(Canvas c) { 
    if (touchLocation!=null) { 
     canvas.drawCircle(touchLocation.x, touchLocation.y, 10, indicatorPaint); 
    } 
    } 

    private Point touchLocation; 
    private Paint indicatorPaint; 
}