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MihaiCristianCondreaMihaiCristianCondrea
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Add Retrofit networking lesson
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40 files changed

+669
-22
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‎app/build.gradle‎

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@@ -100,6 +100,8 @@ dependencies {
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implementation libs.androidx.room.runtime
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annotationProcessor libs.androidx.room.compiler
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annotationProcessor libs.glide.compiler
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implementation libs.retrofit2
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implementation libs.retrofit2.converter.gson
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// Testing
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testImplementation libs.junit

‎app/src/main/AndroidManifest.xml‎

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android:label="@string/room_database"
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android:parentActivityName=".ui.screens.android.lessons.data.room.RoomActivity" />
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<activity
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android:name=".ui.screens.android.lessons.networking.retrofit.RetrofitActivity"
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android:exported="false"
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android:label="@string/retrofit"
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android:parentActivityName=".ui.screens.main.MainActivity" />
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<activity
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android:name=".ui.screens.android.lessons.networking.retrofit.RetrofitCodeActivity"
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android:exported="false"
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android:label="@string/retrofit"
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android:parentActivityName=".ui.screens.android.lessons.networking.retrofit.RetrofitActivity" />
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<activity
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android:name=".ui.screens.settings.SettingsActivity"
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android:exported="false"

‎app/src/main/assets/quiz_questions.json‎

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"question": "What component shows a scrollable list of items?",
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"options": ["RecyclerView", "TextView", "ImageView", "Button"],
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"answer": 0
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},
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{
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"question": "Which library simplifies HTTP requests by turning APIs into interfaces?",
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"options": ["Volley", "Retrofit", "Glide", "Room"],
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"answer": 1
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}
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]

‎app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/android/lessons/networking/retrofit/RetrofitActivity.java‎

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package com.d4rk.androidtutorials.java.ui.screens.android.lessons.networking.retrofit;
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import android.content.Intent;
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import android.os.Bundle;
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import android.os.Handler;
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import android.os.Looper;
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import androidx.annotation.Nullable;
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import com.d4rk.androidtutorials.java.databinding.ActivityRetrofitBinding;
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import com.d4rk.androidtutorials.java.ui.components.navigation.UpNavigationActivity;
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import com.d4rk.androidtutorials.java.utils.EdgeToEdgeDelegate;
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import com.d4rk.androidtutorials.java.R;
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import retrofit2.Call;
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import retrofit2.Callback;
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import retrofit2.Response;
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import retrofit2.Retrofit;
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import retrofit2.converter.gson.GsonConverterFactory;
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import retrofit2.http.GET;
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/**
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* Demonstrates a simple HTTP request using Retrofit.
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*/
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public class RetrofitActivity extends UpNavigationActivity {
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private ActivityRetrofitBinding binding;
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private final Handler handler = new Handler(Looper.getMainLooper());
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private JsonPlaceholderApi api;
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interface JsonPlaceholderApi {
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@GET("todos/1")
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Call<Todo> getTodo();
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}
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static class Todo {
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public String title;
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}
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@Override
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protected void onCreate(@Nullable Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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binding = ActivityRetrofitBinding.inflate(getLayoutInflater());
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setContentView(binding.getRoot());
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EdgeToEdgeDelegate edgeToEdgeDelegate = new EdgeToEdgeDelegate(this);
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edgeToEdgeDelegate.applyEdgeToEdge(binding.constraintLayout);
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Retrofit retrofit = new Retrofit.Builder()
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.baseUrl("https://jsonplaceholder.typicode.com/")
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.addConverterFactory(GsonConverterFactory.create())
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.build();
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api = retrofit.create(JsonPlaceholderApi.class);
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binding.buttonFetch.setOnClickListener(v -> {
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binding.buttonFetch.setEnabled(false);
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api.getTodo().enqueue(new Callback<Todo>() {
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@Override
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public void onResponse(Call<Todo> call, Response<Todo> response) {
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if (response.isSuccessful() && response.body() != null) {
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binding.textViewResult.setText(response.body().title);
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} else {
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binding.textViewResult.setText(R.string.snack_general_error);
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}
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binding.buttonFetch.setEnabled(true);
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}
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@Override
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public void onFailure(Call<Todo> call, Throwable t) {
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binding.textViewResult.setText(R.string.snack_general_error);
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binding.buttonFetch.setEnabled(true);
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}
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});
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});
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binding.floatingButtonShowSyntax.setOnClickListener(v ->
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startActivity(new Intent(RetrofitActivity.this, RetrofitCodeActivity.class)));
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handler.postDelayed(() -> binding.floatingButtonShowSyntax.shrink(), 5000);
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}
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@Override
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protected void onDestroy() {
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super.onDestroy();
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handler.removeCallbacksAndMessages(null);
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}
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}

‎app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/android/lessons/networking/retrofit/RetrofitCodeActivity.java‎

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package com.d4rk.androidtutorials.java.ui.screens.android.lessons.networking.retrofit;
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import android.os.Bundle;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import androidx.fragment.app.Fragment;
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import androidx.viewpager2.adapter.FragmentStateAdapter;
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import com.d4rk.androidtutorials.java.R;
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import com.d4rk.androidtutorials.java.databinding.ActivityTabLayoutBinding;
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import com.d4rk.androidtutorials.java.ui.components.navigation.UpNavigationActivity;
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import com.d4rk.androidtutorials.java.ui.screens.android.lessons.networking.retrofit.tabs.RetrofitTabCodeFragment;
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import com.d4rk.androidtutorials.java.ui.screens.android.lessons.networking.retrofit.tabs.RetrofitTabLayoutFragment;
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import com.d4rk.androidtutorials.java.utils.EdgeToEdgeDelegate;
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import com.google.android.material.tabs.TabLayoutMediator;
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import java.util.ArrayList;
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/**
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* Displays Java and XML snippets for the Retrofit example.
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*/
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public class RetrofitCodeActivity extends UpNavigationActivity {
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private ActivityTabLayoutBinding binding;
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@Override
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protected void onCreate(@Nullable Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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binding = ActivityTabLayoutBinding.inflate(getLayoutInflater());
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setContentView(binding.getRoot());
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EdgeToEdgeDelegate edgeToEdgeDelegate = new EdgeToEdgeDelegate(this);
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edgeToEdgeDelegate.applyEdgeToEdge(binding.appBarLayout);
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setupViewPager();
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new TabLayoutMediator(binding.tabs, binding.viewpager, (tab, position) -> {
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ViewPagerAdapter adapter = (ViewPagerAdapter) binding.viewpager.getAdapter();
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if (adapter != null) {
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tab.setText(adapter.getPageTitle(position));
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}
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}).attach();
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}
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private void setupViewPager() {
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ViewPagerAdapter adapter = new ViewPagerAdapter(this);
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adapter.addFragment(new RetrofitTabCodeFragment(), getString(R.string.code_java));
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adapter.addFragment(new RetrofitTabLayoutFragment(), getString(R.string.layout_xml));
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binding.viewpager.setAdapter(adapter);
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}
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private static class ViewPagerAdapter extends FragmentStateAdapter {
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private final ArrayList<Fragment> fragmentList = new ArrayList<>();
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private final ArrayList<String> fragmentTitleList = new ArrayList<>();
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ViewPagerAdapter(@NonNull UpNavigationActivity activity) {
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super(activity);
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}
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void addFragment(@NonNull Fragment fragment, @NonNull String title) {
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fragmentList.add(fragment);
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fragmentTitleList.add(title);
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}
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@NonNull
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@Override
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public Fragment createFragment(int position) {
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return fragmentList.get(position);
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}
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@Override
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public int getItemCount() {
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return fragmentList.size();
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}
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CharSequence getPageTitle(int position) {
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return fragmentTitleList.get(position);
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}
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}
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}

‎app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/android/lessons/networking/retrofit/tabs/RetrofitTabCodeFragment.java‎

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package com.d4rk.androidtutorials.java.ui.screens.android.lessons.networking.retrofit.tabs;
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import android.content.SharedPreferences;
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import android.graphics.Typeface;
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import android.os.Bundle;
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import android.util.Log;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import androidx.annotation.NonNull;
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import androidx.fragment.app.Fragment;
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import androidx.preference.PreferenceManager;
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import com.d4rk.androidtutorials.java.R;
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import com.d4rk.androidtutorials.java.databinding.FragmentCodeBinding;
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import com.d4rk.androidtutorials.java.utils.CodeHighlighter;
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import com.d4rk.androidtutorials.java.utils.CodeViewUtils;
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import com.d4rk.androidtutorials.java.utils.FontManager;
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import com.google.android.gms.ads.AdRequest;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import me.zhanghai.android.fastscroll.FastScrollerBuilder;
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/**
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* Shows the Java implementation for the Retrofit example.
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*/
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public class RetrofitTabCodeFragment extends Fragment {
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@Override
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public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
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FragmentCodeBinding binding = FragmentCodeBinding.inflate(inflater, container, false);
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new FastScrollerBuilder(binding.scrollView).useMd2Style().build();
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binding.adView.loadAd(new AdRequest.Builder().build());
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SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(requireContext());
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Typeface monospaceFont = FontManager.getMonospaceFont(requireContext(), prefs);
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CodeViewUtils.applyDefaults(monospaceFont, binding.codeView);
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StringBuilder builder = new StringBuilder();
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InputStream inputStream = getResources().openRawResource(R.raw.text_retrofit_java);
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try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream))) {
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String line;
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while ((line = reader.readLine()) != null) {
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builder.append(line).append('\n');
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}
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binding.codeView.setText(builder.toString());
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CodeHighlighter.applyJavaTheme(binding.codeView);
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} catch (IOException e) {
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Log.e("RetrofitTabCode", "Error reading code", e);
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}
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return binding.getRoot();
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}
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}

‎app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/android/lessons/networking/retrofit/tabs/RetrofitTabLayoutFragment.java‎

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package com.d4rk.androidtutorials.java.ui.screens.android.lessons.networking.retrofit.tabs;
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import android.content.SharedPreferences;
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import android.graphics.Typeface;
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import android.os.Bundle;
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import android.util.Log;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import androidx.annotation.NonNull;
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import androidx.fragment.app.Fragment;
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import androidx.preference.PreferenceManager;
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import com.d4rk.androidtutorials.java.R;
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import com.d4rk.androidtutorials.java.databinding.FragmentLayoutBinding;
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import com.d4rk.androidtutorials.java.utils.CodeHighlighter;
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import com.d4rk.androidtutorials.java.utils.CodeViewUtils;
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import com.d4rk.androidtutorials.java.utils.FontManager;
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import com.google.android.gms.ads.AdRequest;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import me.zhanghai.android.fastscroll.FastScrollerBuilder;
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/**
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* Shows the XML layout for the Retrofit example.
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*/
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public class RetrofitTabLayoutFragment extends Fragment {
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@Override
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public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
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FragmentLayoutBinding binding = FragmentLayoutBinding.inflate(inflater, container, false);
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new FastScrollerBuilder(binding.scrollView).useMd2Style().build();
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binding.adView.loadAd(new AdRequest.Builder().build());
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SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(requireContext());
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Typeface monospaceFont = FontManager.getMonospaceFont(requireContext(), prefs);
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CodeViewUtils.applyDefaults(monospaceFont, binding.codeView);
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StringBuilder builder = new StringBuilder();
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InputStream inputStream = getResources().openRawResource(R.raw.text_retrofit_xml);
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try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream))) {
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String line;
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while ((line = reader.readLine()) != null) {
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builder.append(line).append('\n');
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}
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binding.codeView.setText(builder.toString());
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CodeHighlighter.applyXmlTheme(binding.codeView);
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} catch (IOException e) {
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Log.e("RetrofitTabLayout", "Error reading layout", e);
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}
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return binding.getRoot();
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}
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}

‎app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/android/repository/LessonRepository.java‎

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new com.d4rk.androidtutorials.java.data.repository.LessonRepository.Lesson(R.string.grid_view, R.raw.text_grid_view_java, R.raw.text_grid_view_xml);
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case "WebView" ->
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new com.d4rk.androidtutorials.java.data.repository.LessonRepository.Lesson(R.string.web_view, R.raw.text_webview_java, R.raw.text_webview_xml);
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case "Retrofit" ->
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new com.d4rk.androidtutorials.java.data.repository.LessonRepository.Lesson(R.string.retrofit, R.raw.text_retrofit_java, R.raw.text_retrofit_xml);
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case "BottomNavigation" ->
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new com.d4rk.androidtutorials.java.data.repository.LessonRepository.Lesson(R.string.bottom_navigation, R.raw.text_bottom_navigation_java, R.raw.text_bottom_navigation_xml);
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case "NavigationDrawer" ->

‎app/src/main/res/drawable-anydpi/ic_category_network_tinted.xml‎

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<vector xmlns:android="http://schemas.android.com/apk/res/android"
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android:width="24dp"
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android:height="24dp"
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android:viewportWidth="24"
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android:viewportHeight="24">
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<path
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android:fillColor="?attr/colorSecondary"
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android:pathData="M6.5,20Q5.88,20 5.44,19.56Q5,19.12 5,18.5L5,15.5Q5,14.88 5.44,14.44Q5.88,14 6.5,14Q7.12,14 7.56,14.44Q8,14.88 8,15.5L8,18.5Q8,19.12 7.56,19.56Q7.12,20 6.5,20ZM12.5,20Q11.88,20 11.44,19.56Q11,19.12 11,18.5L11,10.5Q11,9.88 11.44,9.44Q11.88,9 12.5,9Q13.12,9 13.56,9.44Q14,9.88 14,10.5L14,18.5Q14,19.12 13.56,19.56Q13.12,20 12.5,20ZM18.5,20Q17.88,20 17.44,19.56Q17,19.12 17,18.5L17,5.5Q17,4.88 17.44,4.44Q17.88,4 18.5,4Q19.12,4 19.56,4.44Q20,4.88 20,5.5L20,18.5Q20,19.12 19.56,19.56Q19.12,20 18.5,20Z"/>
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</vector>

‎app/src/main/res/layout/activity_retrofit.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:app="http://schemas.android.com/apk/res-auto"
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android:id="@+id/constraintLayout"
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android:layout_width="match_parent"
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android:layout_height="match_parent">
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<com.google.android.material.textview.MaterialTextView
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android:id="@+id/textViewSummary"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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android:padding="16dp"
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android:text="@string/summary_retrofit"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toTopOf="parent" />
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<com.google.android.material.button.MaterialButton
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android:id="@+id/buttonFetch"
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style="@style/Widget.Material3.Button.ElevatedButton"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_marginTop="16dp"
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android:text="@string/fetch_data"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toBottomOf="@id/textViewSummary" />
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<com.google.android.material.textview.MaterialTextView
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android:id="@+id/textViewResult"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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android:layout_marginTop="16dp"
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android:padding="16dp"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toBottomOf="@id/buttonFetch" />
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<com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
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android:id="@+id/floating_button_show_syntax"
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style="@style/Widget.Material3.ExtendedFloatingActionButton.Icon.Surface"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_margin="24dp"
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android:contentDescription="@string/tooltip_show_java_code_snippet"
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android:text="@string/show_code"
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android:textSize="14sp"
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android:tooltipText="@string/tooltip_show_java_code_snippet"
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app:icon="@drawable/ic_code"
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app:layout_constraintBottom_toBottomOf="parent"
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app:layout_constraintEnd_toEndOf="parent" />
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</androidx.constraintlayout.widget.ConstraintLayout>

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