Unable to get the bitmap of a linearlayout along with its child views

问题

I am creating the bitmap from a linearlayout with the following code

public static Bitmap loadBitmapFromView(View v ) {

    //Bitmap b = Bitmap.createBitmap( v.getLayoutParams.width, v.getLayoutParams.height, Bitmap.Config.ARGB_8888);
    Bitmap b = Bitmap.createBitmap( v.getLayoutParams.width, v.getLayoutParams.height, Bitmap.Config.ARGB_8888);
    Canvas c = new Canvas(b);
    v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());
    v.draw(c);
    return b;
}

but i can not see the views in it all i can see is a big grey screen

have tried the answer at this question also Android Problems Converting ViewGroup with Children into Bitmap but still not working

My view is being inflated from xml and when i use the code mentioned above i get force close for null pointer exception and if i mention the width and height to some number like 200 , 200 then i am able to see the grey background only not the view in it.

回答1:

You need to measure the view before layout like

v.measure(
      MeasureSpec.makeMeasureSpec(v.getLayoutParams().width,MeasureSpec.EXACTLY),
      MeasureSpec.makeMeasureSpec(v.getLayoutParams().height, MeasureSpec.EXACTLY));
v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());
Bitmap b = Bitmap.createBitmap(v.getWidth(), v.getHeight()
        ,Bitmap.Config.RGB_565);
Canvas c = new Canvas(b);
v.draw(c);

来源：https://stackoverflow.com/questions/8064352/unable-to-get-the-bitmap-of-a-linearlayout-along-with-its-child-views