ImageView在onActivityResult中的更改时未更新

Question

I have tried using Picasso and every method I could possibly find here on stackoverflow. I'm taking an image with camera and getting the value onActivity result. The imageView gets updated only after I quit and restart the application. I want imageview to change before my eyes. None of the code seems to be working.

I tried this

getActivity().runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    profile.setImageBitmap(thumbnail);
                }
            });

nothing happens when camera view closes after hitting ok.

I also tried this:

   Thread thread = new Thread()
            {
                @Override
                public void run() {
                    getActivity().runOnUiThread(new Runnable() //run on ui thread
                    {
                        public void run()
                        {
                            profile.setImageBitmap(thumbnail);

                        }
                    });
                }
            };
            thread.start();

but UI doesn't change, image remains the same.

I tried Async tasks, Picasso doesn't work either.

Idk how to do this, it's been a while and I'm super frustrated

Here is the code with both techniques:

public void onActivityResult(int requestCode, int resultCode, Intent data) {

        if (requestCode == 1 && data != null) {
            final Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
            ByteArrayOutputStream bytes = new ByteArrayOutputStream();
            thumbnail.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
            final File destination = new File(Environment.getExternalStorageDirectory().getAbsolutePath(), "temp.jpg");
            FileOutputStream fo;
            try {
                fo = new FileOutputStream(destination);
                fo.write(bytes.toByteArray());
                fo.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

            uploadProfilePicToS3(destination.getAbsolutePath());

            //this doesn't work
            Thread thread = new Thread()
            {
                @Override
                public void run() {
                    getActivity().runOnUiThread(new Runnable() //run on ui thread
                    {
                        public void run()
                        {
                            profile.setImageBitmap(thumbnail);

                        }
                    });
                }
            };
            thread.start();

            //not working either!
            getActivity().runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    profile.setImageBitmap(thumbnail);
                }
            });

Answer 1

The reason your ImageView is not updated is because 1) Android loads the previous image that is in the cache, as long as you're saving the image to the same destination 2) onActivityResult is called before onResume . This means that the image you loaded into the ImageView is lost when onResume is called.

The first problem is nicely handled by Glide 's signature , and the second problem can be handled with onSavedInstanceState() .

Create a Glide signature when you change the image. This should be different for each change eg current time. Then apply the signature as you load the image.

public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == 1 && data != null) {
        final Bitmap bitmap = (Bitmap) data.getExtras().get("data");
        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
        final File destination = new File(
            Environment.getExternalStorageDirectory()
            .getAbsolutePath(), "temp.jpg");
        FileOutputStream fo;
        try {
            fo = new FileOutputStream(destination);
            fo.write(bytes.toByteArray());
            fo.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }
    Uri uri = Uri.fromFile(destination)

    //Create your signature
    SimpleDateFormat dateFormat = new SimpleDateFormat("yyMMddHHmmss", 
        Locale.getDefault());
    String timeStamp = dateFormat.format(new Date());
    newImageSignature =  new RequestOptions()
        .signature(new ObjectKey(timeStamp));

    //Load your image
    Glide.with(yourActivity.this) // Or Fragment
        .load(bitmap) // Or Uri
        .apply(newImageSignature)
        .into(imageView);

    // You can save the uri and signature to Firebase Database, 
    // and your image to Storage here

Then save the new signature in onSaveInstanceState()

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    if (newImageSignature != null) {
        outState.putString("IMAGE_SIGNATURE”, newImageSignature.toString());
        outState.putString("IMAGE_URI”, uri.toString());
    }
}

Now you can retrieve the signature in onCreate()

Uri ImageUri;
ImageView imageView;
RequestOptions imageSignature;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Retrieve your saved parameters. Or get them from a database.
    if (savedInstanceState != null){
        imageSignature = new RequestOptions()
            .signature(new 
             ObjectKey(savedInstanceState.getString("IMAGE_SIGNATURE"))); 
        imageUri = Uri.parse(savedInstanceState.getString("IMAGE_URI"));

    // Instantiate your imageview

    // Load image
    if(imageUri != null && imageSignature != null){
        Glide.with(yourActivity.this) // Or Fragment
        .load(bitmap) // Or Uri
        .apply(newImageSignature)
        .into(imageView);
    }
}

NB: I just wrote this, not tested yet. Hope it gives