view转bitmap

最后调试了半天，终于成功了

最后有用的代码

public static Bitmap loadBitmapFromView(View v) {
    if (v == null) {
        return null;
    }
    int intw=View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);
    int inth=View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);
    v.measure(intw, inth);
    Bitmap bitmap = Bitmap.createBitmap(v.getMeasuredWidth(),v.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    canvas.drawColor(Color.WHITE);
    v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());
    v.draw(canvas);
    return bitmap;
}