Question

在Android中，我有一个缩放和居中的自定义imageview。在imageview上，通过画布绘制图像，并将imageview缩放到缩放的位图。我想在这个自定义视图中移动一个Rect。问题是，移动Rectangle仅适用于原始事件，因此rect在到达底部之前消失。（因为imageview认为touchevent在外面）

我覆盖了onDraw方法：

@Override
protected void onDraw(Canvas canvas) {
    canvas.drawBitmap(mImageBitmap, 0, 0, mImagePaint);
    canvas.setMatrix(matrix);
    Rect rt = new Rect((int)rawEventX-50, (int)rawEventY-50, (int) rawEventX+50, (int) rawEventY + 50); 
            // works, but disappears before bottom of imageview is reached.. (because the imageview thinks that the touchevent is outside)
    //Rect rt = new Rect((int)eventX-50, (int)eventY-50, (int) eventX+50, (int) eventY + 50); 
            // This rect is draw over and left of the finger :-(
    canvas.drawRect(rt, paintText);
}

缩放图像和自定义图像视图：

protected void scaleBitmapToImageViewSizeWithAntiAliashing(Bitmap bitmap) {
    getLayoutParams().width = scaledWidth;
    getLayoutParams().height = scaledHeight;
    refreshDrawableState();
    mImageBitmap = Bitmap.createScaledBitmap(bitmap, scaledWidth, scaledHeight, true);
    mImageCanvas = new Canvas(mImageBitmap);
}

我还有一个onTouchEvent：

@Override
public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                eventX = event.getX();
                eventY = event.getY();
                rawEventX = event.getRawX();
                rawEventY = event.getRawY();
                savedMatrix.set(matrix);
                //start.set(event.getRawX(), event.getRawY());
                start.set(eventX, eventY);
                mode = Constants.DRAG;
                break;
            case MotionEvent.ACTION_MOVE:
                    matrix.set(savedMatrix);
                    eventX = event.getX();
                    eventY = event.getY();
                    rawEventX = event.getRawX();
                    rawEventY = event.getRawY();
                break;
        }
    invalidate();
    return true;
}

是否可以仅使用onTouchEvent的自定义imageview内的imageview坐标？如何在Imageview中使用OnTouchEvent？我没有通过谷歌找到任何解决方案，我真的很沮丧。

Answer 1

问题是：如果你想从基于像素的View coords映射到ImageView绘制coords，那么使用getImageMatrix（）invert（）它，然后使用mapPoints（）在倒置矩阵上 - 感谢pskink

Android：在imageview内使用Imageview坐标，而不是原始坐标

1 个答案: