Question

I’m still fresh to Android programming and I don;t quite get how does Camera activity returns data.
I’m learning from video tutorials and I’m having problems understanding something, so there it goes (exceptions from code):

int cameraData = 0;

intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, cameraData);

I understand that this parts starts Activity with implicit intent and wait for Camera to return results

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == RESULT_OK) {
        Bundle extras = data.getExtras();
        bmp = (Bitmap) extras.get("data");
        iv.setImageBitmap(bmp);
    }
}

And this one waits for receives data from that Activity, where

• requestCode is 0 from cameraData
• resultCode is RESULT_OK if picture was taken
• data is data receiver from camera

I’m having difficulty with understanding bmp = (Bitmap) extras.get("data");

How exactly should I know which String key to use to get particular data? I can’t find information on what kind of data and in what form Camera returns results.

Answer 1

The documentation says that the “data” key holds a thumbnail and that if you need full image you should provide a filename by calling putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f)) on your Intent, where f is a File.