Ok, I finally found the problem. I was not aware that I need to use onSaveInstanceState and onRestoreInstanceState to store the values I don't want to loose from an Activity when I'm doing certain things, like initiating the Camera and taking a photo.
So I added this code:
@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
super.onSaveInstanceState(savedInstanceState);
// Save UI state changes to the savedInstanceState.
// This bundle will be passed to onCreate if the process is
// killed and restarted.
savedInstanceState.putBoolean("photoUploaded", photoUploaded);
}
@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
// Restore UI state from the savedInstanceState.
// This bundle has also been passed to onCreate.
photoUploaded = savedInstanceState.getBoolean("photoUploaded");
if (photoUploaded) {
File photoFile = new File(Environment.getExternalStorageDirectory(), "Photo.png");
Uri imageUri = Uri.fromFile(photoFile);
Bitmap myBitmap = BitmapFactory.decodeFile(imageUri.getPath());
BitmapDrawable ob = new BitmapDrawable(myBitmap);
ImageView myImage = (ImageView) findViewById(R.id.uploadedImage);
myImage.setBackgroundDrawable(ob);
}
}
and now is working.
Not sure how to do to make this question as solved.