点击位图（Android）时从屏幕上删除位图

Question

我正在使用surfaceview在屏幕上绘制位图现在我想在点击/触摸位图时将其从屏幕上删除。我怎么能这样做。

Answer 1

将此添加到mainActivity以获取触摸坐标：

(...)

int touchX, touchY;
boolean touch = false;

@Override
public boolean onTouchEvent (MotionEvent event) 
{
    if(event.getAction() == MotionEvent.ACTION_UP) 
    {
        touchX = (int) event.getX();
        touchY = (int) event.getY();
        touch = true;
    }

    return false;
}

(...)

并将其用于您的位图：

(...)

if(mainActivity.touch) 
{
    if( (mainActivity.touchX > bitmapX) && (mainActivity.touchX < bitmapX + bitmapWidth) &&  //
        (mainActivity.touchY > bitmapY) && (mainActivity.touchY < bitmapY + bitmapHeight) )      //touch detection for your bitmap                                                               
    {
        bitmap.recycle();  //I think this is what you want
    }    
}

if(!bitmap.isRecycled()) //using a recycled bitmap will cause an error
{    
    yourCanvas.drawBitmap(...);
}

(...)