Free crop the image android

问题:

I want to crop the image with multiple paths like the below image:

.

So far, what I have implemented saves all drawn paths into an ArrayList, then I retrieve those cropped paths in another activity.

However, every path is adding the first drawn point.

Here's my code:

public boolean onTouch(View view, MotionEvent event) {

    if (event.getAction() == MotionEvent.ACTION_DOWN) {
        points.clear();
        points2 = new ArrayList<Point>();
    }

    Point point = new Point();
    point.x = (int) event.getX();
    point.y = (int) event.getY();

    zoomPos.x = event.getX();
    zoomPos.y = event.getY();

    if (flgPathDraw) {
        zooming = true;
        if (bfirstpoint) {
            if (comparepoint(mfirstpoint, point)) {
                points.add(mfirstpoint);
                points2.add(mfirstpoint);
            } else {
                points.add(point);
                points2.add(point);
            }
        } else {
            points.add(point);
            points2.add(point);
        }
        if (!(bfirstpoint)) {
            mfirstpoint = point;
            bfirstpoint = true;
        }
    }

    invalidate();
    if (event.getAction() == MotionEvent.ACTION_UP) {
        mlastpoint = point;
        if (flgPathDraw) {
            if (points.size() > 12) {
                if (!comparepoint(mfirstpoint, mlastpoint)) {
                    zooming = false; 
                    points2.add(mfirstpoint);

                    addpaths.add(path);

                    invalidate();
                }
            }
        }

        if (points2!=null&&!(points2.isEmpty())) {
            pointlists.add(points2);
        }

    }

    return true;
}

//Croping code for drawn paths.

for (int j=0;j<CutPhotoView.pointlists.size();j++) {
    for (int i = 0; i <CutPhotoView.pointlists.get(j).size(); i++) {
        path.lineTo(CutPhotoView.pointlists.get(j).get(i).x, 
                    CutPhotoView.pointlists.get(j).get(i).y);
    }
    canvas.drawPath(path, paint);
}

回答1:

By modifying this example you can do it.

1. create a List<Bitmap>.
2. call save(); at end of crop method.
3. in save method, generate bitmap of im_crop_image_view and add it to list.
4. after all crops, pass list to second activity.
5. in second activity, use FrameLayout and add dynamic imageviews for every bitmap of list to FrameLayout.

It will surely work. I have used this method to generate animation of image and succeeded. I am saving all bitmaps as png in internal storage for later use.

Here is what i have done. I added every image after interval of 1 second because i need to animate it for my app. You can put every image without interval.