animationDrawable only displays last frame

Question

I'm trying to create an animation out of multiple png images. Here's my code:

AnimationDrawable animation = new AnimationDrawable();

for (int i = 0; i < translate_text.length(); i++)
{
    byte[] byteArray = Base64.getDecoder().decode(client._fromServer.elementAt(i));
    Bitmap bmp = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length);
    ImageView image = (ImageView) findViewById(R.id.sign);
    image.setImageBitmap(Bitmap.createScaledBitmap(bmp, image.getWidth(), image.getHeight(), false));
    animation.addFrame(image.getDrawable(), 1000);
}

animation.setOneShot(true);
animation.start();

but this only displays the last frame... Any ideas?

Edit: Probably should've done this earlier, but here goes:

translate_text is a string. It represents the image sequence. For example if the string is "bob" then there should be 3 images: the letter B, the letter O and the letter B.

client._fromServer is a vector of strings. Each string is the image itself encoded in base64. That's why client._fromServer.elementsAt(i) is a string that needs to be decoded and turned into byteArray.

Answer 1

I think it is because you get the Drawable from the same ImageView.
When you do image.setImageBitmap() it updates the reference of the Drawable in the ImageView and the AnimationDrawable gets affected also.
You should use a different Drawable instance for each addFrame call.

Something like that:

AnimationDrawable animation = new AnimationDrawable();
ImageView image = (ImageView) findViewById(R.id.sign);

for (int i = 0; i < translate_text.length(); i++)
{
    byte[] byteArray = Base64.getDecoder().decode(client._fromServer.elementAt(i));
    Bitmap bmp = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length);
    final Bitmap scaledBitmap = Bitmap.createScaledBitmap(bmp, image.getWidth(), image.getHeight(), false);
    Drawable drawable = new BitmapDrawable(getResources(), scaledBitmap);
    animation.addFrame(drawable, 1000);
}

animation.setOneShot(true);
animation.start();