布局中的Android滚动和缩放

Question

我希望有一个用户界面可以绘制一些图形项目，用户可以用手势滚动和缩放图形场景（比如谷歌地图）。我在Qt中使用了图形框架，但我找不到类似的东西机器人。

我喜欢Dragging and Scaling并在开发人员中示例 InteractiveChart ，但它似乎很复杂。我试图通过mysely实现。这是一些片段。我使用ScaleGestureDetector和GestureDetector来更改参数mContent，mContent是一个FrameLayout.It功能但有一些bug。我想要一些建议，谢谢！

private final ScaleGestureDetector.OnScaleGestureListener mScaleGestureListener
        = new ScaleGestureDetector.SimpleOnScaleGestureListener() {
    @Override
    public boolean onScale(ScaleGestureDetector detector) {
        float scaleFactor = detector.getScaleFactor();//This value is defined as (getCurrentSpan() / getPreviousSpan())
        float factor = scaleFactor / lastScaleFactor;
        Log.d(TAG, "factor+" + factor);
        lastScaleFactor=scaleFactor;
        scale*= factor;
        mContent.setScaleX(scale);
        mContent.setScaleY(scale);

        return super.onScale(detector);
    }

    @Override
    public boolean onScaleBegin(ScaleGestureDetector detector) {
        mContent.setPivotX(detector.getFocusX());
        mContent.setPivotY(detector.getFocusY());
        return true;
    }

    @Override
    public void onScaleEnd(ScaleGestureDetector detector) {
        lastScaleFactor=1;
    }
};

private final GestureDetector.SimpleOnGestureListener mGestureListener
        = new GestureDetector.SimpleOnGestureListener() {
    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
        mContent.scrollBy((int)distanceX,(int)distanceY);
        return true;
    }
};