将视图转换为位图

Question

I have a view I want to create a bitmap for that view(later I want to print that bitmap). What I have tried is as follows

private Bitmap convertViewToBitMap() {      
    View v = rootView;   //rootView is my view to be converted in bitmap
    v.setDrawingCacheEnabled(true);
    Bitmap b = v.getDrawingCache();
    return b;
}

My view "rootview" is a expandable list, when I call convertViewToBitMap() , I get the bitmap of view which is visible on screen, but if view is expanded, the expanded part which is going out of screen does not come in bitmap. So is there a way to get a bitmap of complete view even if it is partially visible on screen?

Answer 1

Try this:

1. Make some adjustments to your view. "Measure" method defines the proper dimensions of your view (change 1000 and 600 to what suits you best)

    view.measure(MeasureSpec.makeMeasureSpec(1000, MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec(600, MeasureSpec.EXACTLY)); 

2. Re-define your view with the new measurements (change also 0,0)

     view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight()); 

3. Create the bitmap

     Bitmap bm=Bitmap.createBitmap(view.getWidth(), view.getHeight(),Bitmap.Config.ARGB_8888); 

After that, you can draw your bitmap to any view

               Canvas cn=new Canvas(bm); 
               anyview.draw(cn);

Also, you can save the bitmap into a file

           try {
                    FileOutputStream out = new FileOutputStream(file);
                    bm.compress(Bitmap.CompressFormat.JPEG, 100, out);

                    out.flush();
                    out.close();

                } catch (Exception e) {
                    e.printStackTrace();
                }