Android- Upload image to Firebase under a specific user

Question

I am fairly new to Android and want to make an app that allows users to upload pictures using Firebase storage. After they log in, I made it so that their Uid gets sent to SharedPreferences, so that I can retrieve it in my imageupload activity later. I need it so that when the image gets sent to Firebase, it gets put under the folder of their userid.

This is my current login activity that retrieves the Uid:

FirebaseAuth auth = FirebaseAuth.getInstance();
        FirebaseAuth.AuthStateListener authListener = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser firebaseUser = firebaseAuth.getCurrentUser();
                if (firebaseUser != null) {
                    String userId = firebaseUser.getUid();
                    sharedPref = getPreferences(MODE_PRIVATE);
                    SharedPreferences.Editor editor = sharedPref.edit();
                    editor.putString("firebasekey", userId);
                    editor.commit();

And this is my imageupload activity:

sharedPref = getPreferences(MODE_PRIVATE);
    String UserId = sharedPref.getString("firebasekey", "1");
    StorageReference storageRef= FirebaseStorage.getInstance().getReference();
    StorageReference mountainsRef = storageRef.child("uploads/"+UserId+System.currentTimeMillis());

Help would be greatly appreciated.

Answer 1

Here you go

String userUid = FirebaseAuth.getInstance().getCurrentUser().getUid();
UploadTask uploadTask = FirebaseStorage.getInstance().child("newFolder").getReference(userUid).putBytes(yourPhotoToByteArray);
uploadTask
            .addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                @Override
                public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {

                }
            })
            .addOnFailureListener(new OnFailureListener() {
                @Override
                public void onFailure(@NonNull Exception e) {

                }
            });

And to retrieve image

StorageReference storageReference = FirebaseStorage.getInstance().getReference("newFolder/" + userUid);

You can read here more about FirebaseCloudStorage. Here how to upload, and here how to download them.