自定义view转Bitmap

将自定义view填充数据后，转成bitmap，填充到ImageView中

1.自定义布局

里面是RecycleView用于填充数据，ConstraintLayout是为了设置宽高生效，多加了层布局
test.xml

2.BitMapUtils工具类

View.MeasureSpec.EXACTLY 适用match_parent
View.MeasureSpec.AT_MOST 适用wrap_content

注意：transViewToBitmap中传的View一定是match_parent
getMaxSize中传的View一定是wrap_content

    /**
     * 自定义view转图片
     *
     * @param view
     * @return
     */
    public static Bitmap transViewToBitmap(View view, int size) {
        int measuredWidth = View.MeasureSpec.makeMeasureSpec(size, View.MeasureSpec.EXACTLY);
        int measuredHeight = View.MeasureSpec.makeMeasureSpec(size, View.MeasureSpec.EXACTLY);
        view.measure(measuredWidth, measuredHeight);
        int w = view.getMeasuredWidth();
        int h = view.getMeasuredHeight();
        Bitmap bmp = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bmp);
        canvas.drawColor(Color.TRANSPARENT); //如果不设置canvas画布为白色，则生成透明
        view.layout(0, 0, w, h);
        view.draw(canvas);
        return bmp;
    }

    /**
     * 获取自适应view最大高度/宽度
     *
     * @param view
     * @return
     */
    public static int getMaxSize(View view) {
        int measuredWidth = View.MeasureSpec.makeMeasureSpec(10000, View.MeasureSpec.AT_MOST);
        int measuredHeight = View.MeasureSpec.makeMeasureSpec(10000, View.MeasureSpec.AT_MOST);
        view.measure(measuredWidth, measuredHeight);
        int w = view.getMeasuredWidth();
        int h = view.getMeasuredHeight();
        return w > h ? w : h;
    }

3.

 View view = LayoutInflater.from(context).inflate(R.layout.layout_marker_combine, null, false);
        RecyclerView recyclerView = view.findViewById(R.id.recycleview);
        recyclerView.setLayoutManager(new LinearLayoutManager(context));
        //填充RecycleView数据而已
        TestAdapter adapter = new TestAdapter();
        adapter.bindToRecyclerView(recyclerView);
        //获取内部RecycleView宽高最大值作为BitMap的宽高，size也可直接写死，我的需求是图片宽高一样
        int size = BitmapUtil.getMaxSize(recyclerView);
       BitMap bitmap = BitmapUtil.transViewToBitmap(view,size));