Display data from firebase storage

Question

I tried someone tutorial about retrieve data from firebase storage. There's no error when I run on my device, but the progress bar keep load and the data won't appear. This is the activity code and the gradle. Beside that, I have layout activity_friends, item_list.xml, and model named FriendsResponse.

FriendsActivity.java

public class FriendsActivity extends AppCompatActivity {

    @BindView(R.id.progress_bar)
    ProgressBar progressBar;

    @BindView(R.id.friend_list)
    RecyclerView friendList;

    private FirebaseFirestore db;
    private FirestoreRecyclerAdapter adapter;
    LinearLayoutManager linearLayoutManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_friends);

        ButterKnife.bind(this);
        init();
        getFriendList();

    }

    private void init(){
        linearLayoutManager = new LinearLayoutManager(getApplicationContext(), LinearLayoutManager.VERTICAL, false);
        friendList.setLayoutManager(linearLayoutManager);
        db = FirebaseFirestore.getInstance();
    }

    private void getFriendList(){
        Query query = db.collection("Data");

        FirestoreRecyclerOptions<FriendsResponse> response = new FirestoreRecyclerOptions.Builder<FriendsResponse>()
                .setQuery(query, FriendsResponse.class)
                .build();

        adapter = new FirestoreRecyclerAdapter<FriendsResponse, FriendsHolder>(response) {
            @Override
            public void onBindViewHolder(FriendsHolder holder, int position, FriendsResponse model) {
                progressBar.setVisibility(View.GONE);
                holder.textName.setText(model.getName());
                holder.textTitle.setText(model.getTitle());
                holder.textCompany.setText(model.getCompany());
                Glide.with(getApplicationContext())
                        .load(model.getImage())
                        .into(holder.imageView);

                holder.itemView.setOnClickListener(v-> {
                    Snackbar.make(friendList, model.getName()+", "+model.getTitle()+" at "+model.getCompany(), Snackbar.LENGTH_LONG)
                            .setAction("Action", null).show();
                });
            }

            @Override
            public FriendsHolder onCreateViewHolder(ViewGroup group, int i) {
                View view = LayoutInflater.from(group.getContext())
                        .inflate(R.layout.list_item, group, false);

                return new FriendsHolder(view);
            }

            @Override
            public void onError(FirebaseFirestoreException e) {
                Log.e("error", e.getMessage());
            }
        };

        adapter.notifyDataSetChanged();
        friendList.setAdapter(adapter);
    }

    public class FriendsHolder extends RecyclerView.ViewHolder {
        @BindView(R.id.name)
        TextView textName;
        @BindView(R.id.image)
        ImageView imageView;
        @BindView(R.id.title)
        TextView textTitle;
        @BindView(R.id.company)
        TextView textCompany;

        public FriendsHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
        }
    }

    @Override
    public void onStart() {
        super.onStart();
        adapter.startListening();
    }

    @Override
    public void onStop() {
        super.onStop();
        adapter.stopListening();
    }

build.gradle

apply plugin: 'com.android.application'
apply plugin: 'com.jakewharton.butterknife'
apply plugin: 'com.google.gms.google-services'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.3"

    defaultConfig {
        applicationId "com.test.project"
        minSdkVersion 23
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])

    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

    implementation 'androidx.recyclerview:recyclerview:1.1.0'
    implementation 'androidx.cardview:cardview:1.0.0'

    implementation 'com.firebaseui:firebase-ui-database:4.0.0'
    implementation 'com.google.firebase:firebase-database:19.2.1'
    implementation 'com.google.android.gms:play-services-auth:18.0.0'

    implementation "com.google.firebase:firebase-firestore:21.4.2"
    implementation "com.firebaseui:firebase-ui-auth:4.3.1"
    implementation "com.firebaseui:firebase-ui-firestore:6.2.1"

    implementation 'com.jakewharton:butterknife:10.1.0'
    annotationProcessor 'com.jakewharton:butterknife-compiler:10.1.0'

    implementation 'com.github.bumptech.glide:glide:4.11.0'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.11.0'

    implementation 'com.google.firebase:firebase-core:17.3.0'
    implementation 'com.google.android.material:material:1.1.0'
}

This is my database structure:

Answer 1

You are mixing your code, the database structure is for firebase realtime database, while your code is for firestore. Instead of using FirestoreRecyclerAdapter, you need to use FirebaseRecyclerAdapter. Also check the guide:

https://firebase.google.com/docs/database/android/start