BitmapFactory.decodeByteArray returns null

[Alex K.]

Hi all,

I am trying to use Robolectric to test my class which uses SQLiteDatabase to store Bitmaps. However, I cannot make even the simplest code to work. Here is the stripped down test case which fails:

@Test
public void bitmapDecode() {
   Bitmap b = Bitmap.createBitmap(10, 10, Bitmap.Config.RGB_565);

   ByteArrayOutputStream stream = new ByteArrayOutputStream(256);
   b.compress(CompressFormat.PNG, 100, stream);

   byte[] compressedBitmap = stream.toByteArray();

   Bitmap immutableBitmap = BitmapFactory.decodeByteArray(compressedBitmap, 0, compressedBitmap.length);

   assertThat(immutableBitmap, notNullValue());
}

I have @RunWith(RobolectricTestRunner.class) and other tests involving Android classes pass (including example from the Eclipse quick start) so I know Robolectric is configured correctly.

What am I doing wrong?

Thank you,

Alex

[Alex K.]

Could somebody paste this code in their projects and see if it works for you, please?

Knowing if it is my setup problem or Robolectric issue would help me too!

Thank you,

Alex

[Christopher Perry]

I'd start by taking a look at Robolectric's implementations of Bitmap, and BitmapFactory.

[Alexander Kamotsky]

Ah, of course! ShadowBitmap.compress() does not really compress anything. In fact, it writes a text in the output stream https://github.com/pivotal/robolectric/blob/master/src/main/java/com/xtremelabs/robolectric/shadows/ShadowBitmap.java#L28

Similarly, ShadowBitmapFactory creates a new empty bitmap. =\