Question

我能够在图像中创建一个点但是当我将坐标设为touchx时，在canvas.drawCircle（touchX，touchY，2，paint）中触摸我无法在我所在的地方创建圆点。已触摸，此功能应该只在点击图像时工作，但它的创建点，当我触摸图像外，当我触摸屏幕图像正在缩放...我wnat图像不应该缩放，应该创建点只触摸图像。亲切帮助...

imageView.setOnTouchListener(new View.OnTouchListener() {                    
 @Override
public boolean onTouch(View v, MotionEvent event) {               
                touchX = (int) (event.getX());
                touchY = (int) (event.getY());                
                ImageView imageView = (ImageView) findViewById(R.id.imageView2);
                Bitmap bitMap = Bitmap.createBitmap(100,100, Bitmap.Config.ARGB_8888);
                bitMap = bitMap.copy(bitMap.getConfig(), true);     
                Canvas canvas = new Canvas(bitMap);                
                Paint paint = new Paint();                       
                paint.setColor(Color.BLUE);
                paint.setStyle(Paint.Style.FILL);
                paint.setAntiAlias(true);
                imageView.setImageBitmap(bitMap);      
                imageView.setBackgroundResource(R.drawable.image_map);
                canvas.drawCircle(50, 60, 2, paint);
                imageView.invalidate();
                return true;
            }
        });

Answer 1

        ivImage = (ImageView) findViewById(R.id.ivImage);
        final Bitmap bitmap = ((BitmapDrawable)ivImage.getDrawable()).getBitmap().copy(Config.ARGB_8888, true);
        ivImage.setOnTouchListener(new OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {

                int touchX = (int)(event.getX());
                int touchY = (int)(event.getY());
                Canvas canvas = new Canvas(bitmap);
                Paint paint = new Paint();
                paint.setColor(Color.GREEN);
                canvas.drawCircle(touchX, touchY, 2, paint);    // for circle dot
                //canvas.drawPoint(touchX, touchY, paint);  // for single point
                ivImage.setImageBitmap(bitmap);
                ivImage.invalidate();
                return true;
            }
        });

如何在android中触摸图像的特定位置创建一个点

1 个答案: