图像缩放不正确

Question

我想捏缩放图像，但问题是当我缩放它不放大和缩小我的手指。它关系到0点，0

这里是我的代码：

@Override 
public boolean onScale(ScaleGestureDetector detector) { 
    mScaleFactor = detector.getScaleFactor(); 

    Log.e("ScaleFactor", "" + mScaleFactor); 

    // Don't let the object get too small or too large. 
    mScaleFactor = Math.max(0.4f, Math.min(mScaleFactor, 5.0f)); 
    if(mScaleFactor>=1) 
     mScaleFactor=1f; 

    invalidate(); 
    return true; 
} 

我尝试了很多，但能得到什么办法来解决这个问题。

Answer 1

它是有用的

private float[] matrixValues = new float[9]; 
private float maxZoom; 
private float minZoom; 
private float height; 
private float width; 
private RectF viewRect; 


private void init() { 
    maxZoom = 4; 
    minZoom = 0.25f; 
    height = myimage.getDrawable().getIntrinsicHeight()+20; 
    width = myimage.getDrawable().getIntrinsicWidth()+20; 
    viewRect = new RectF(0, 0, myimage.getWidth()+20, myimage.getHeight()+20); 
}