Added Project

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

app/.gitignore

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+/build

app/build.gradle.kts

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+plugins {
+    id("com.android.application")
+    id("com.google.dagger.hilt.android")
+}
+android {
+    namespace = "com.harsh.newsapp2"
+    compileSdk = 34
+
+    defaultConfig {
+        applicationId = "com.harsh.newsapp2"
+        minSdk = 30
+        targetSdk = 33
+        versionCode = 1
+        versionName = "1.0"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_1_8
+        targetCompatibility = JavaVersion.VERSION_1_8
+    }
+
+    // enable data-binding
+    buildFeatures {
+        dataBinding = true
+        viewBinding = true
+    }
+}
+
+dependencies {
+
+    implementation("androidx.appcompat:appcompat:1.6.1")
+    implementation("com.google.android.material:material:1.11.0")
+    implementation("androidx.constraintlayout:constraintlayout:2.1.4")
+    testImplementation("junit:junit:4.13.2")
+    androidTestImplementation("androidx.test.ext:junit:1.1.5")
+    androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
+
+    // Retrofit
+    implementation("com.squareup.retrofit2:retrofit:2.9.0")
+    implementation("com.squareup.retrofit2:converter-gson:2.9.0")
+    implementation("com.squareup.retrofit2:converter-gson:2.9.0")
+    // RxJava3 with retrofit
+    implementation("com.squareup.retrofit2:adapter-rxjava3:2.9.0")
+
+    // Paging Library
+    val pagingVersion = "3.2.1"
+    implementation("androidx.paging:paging-runtime:$pagingVersion")
+        // optional - RxJava3 support
+    implementation("androidx.paging:paging-rxjava3:$pagingVersion")
+
+    // Dagger
+    implementation("com.google.dagger:hilt-android:2.50")
+    annotationProcessor("com.google.dagger:hilt-compiler:2.50")
+
+    // Glide
+    implementation("com.github.bumptech.glide:glide:4.16.0")
+    annotationProcessor("com.github.bumptech.glide:compiler:4.16.0")
+
+    // Lifecycle
+    val lifecycleVersion = "2.7.0"
+    // ViewModel
+    implementation("androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycleVersion")
+    // ViewModel utilities for Compose
+    implementation("androidx.lifecycle:lifecycle-viewmodel-compose:$lifecycleVersion")
+    // LiveData
+    implementation("androidx.lifecycle:lifecycle-livedata-ktx:$lifecycleVersion")
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/androidTest/java/com/harsh/newsapp2/ExampleInstrumentedTest.java

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+package com.harsh.newsapp2;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("com.harsh.newsapp2", appContext.getPackageName());
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+
+    <application
+        android:name=".NewsApp"
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.NewsApp2"
+        tools:targetApi="31">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/com/harsh/newsapp2/MainActivity.java

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+package com.harsh.newsapp2;
+
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.lifecycle.ViewModelProvider;
+import androidx.recyclerview.widget.GridLayoutManager;
+
+import android.os.Bundle;
+
+import com.bumptech.glide.RequestManager;
+import com.harsh.newsapp2.adapter.NewsAdapter;
+import com.harsh.newsapp2.adapter.NewsLoadStateAdapter;
+import com.harsh.newsapp2.databinding.ActivityMainBinding;
+import com.harsh.newsapp2.util.GridSpace;
+import com.harsh.newsapp2.util.NewsComparator;
+import com.harsh.newsapp2.viewmodel.NewsViewModel;
+
+import javax.inject.Inject;
+
+import dagger.hilt.android.AndroidEntryPoint;
+import io.reactivex.rxjava3.disposables.Disposable;
+
+@AndroidEntryPoint
+public class MainActivity extends AppCompatActivity {
+
+    NewsViewModel mainActivityViewModel;
+    ActivityMainBinding activityMainBinding;
+    NewsAdapter newsAdapter;
+
+    @Inject
+    RequestManager requestManager;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        activityMainBinding = ActivityMainBinding.inflate(getLayoutInflater());
+        setContentView(activityMainBinding.getRoot());
+
+        newsAdapter = new NewsAdapter(new NewsComparator(), requestManager);
+        mainActivityViewModel = new ViewModelProvider(this).get(NewsViewModel.class);
+
+        initRecyclerViewAdapter();
+
+        // subscribe to paging
+        Disposable subscribeResult = mainActivityViewModel.newsPagingDataFlowable.subscribe(newsPagingData -> {
+                newsAdapter.submitData(getLifecycle(), newsPagingData);
+                }
+        );
+    }
+
+    private void initRecyclerViewAdapter() {
+        GridLayoutManager gridLayoutManager = new GridLayoutManager(this, 2);
+        activityMainBinding.recyclerViewNews.setLayoutManager(gridLayoutManager);
+        activityMainBinding.recyclerViewNews.addItemDecoration(new GridSpace(2, 20, true));
+        activityMainBinding.recyclerViewNews.setAdapter(
+                newsAdapter.withLoadStateFooter(
+                        new NewsLoadStateAdapter(view -> {
+                            newsAdapter.retry();
+                        }
+                        )
+                )
+        );
+        gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
+            @Override
+            public int getSpanSize(int position) {
+                return newsAdapter.getItemViewType(position) == NewsAdapter.LOADING_ITEM ? 1 : 2;
+            }
+        });
+    }
+}

app/src/main/java/com/harsh/newsapp2/NewsApp.java

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+package com.harsh.newsapp2;
+
+import android.app.Application;
+
+import dagger.hilt.android.HiltAndroidApp;
+
+@HiltAndroidApp
+public class NewsApp extends Application {
+}

app/src/main/java/com/harsh/newsapp2/adapter/NewsAdapter.java

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+package com.harsh.newsapp2.adapter;
+
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.ViewGroup;
+
+import androidx.annotation.NonNull;
+import androidx.paging.PagingDataAdapter;
+import androidx.recyclerview.widget.DiffUtil;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.bumptech.glide.RequestManager;
+import com.harsh.newsapp2.databinding.SingleNewsItemBinding;
+import com.harsh.newsapp2.model.News;
+
+public class NewsAdapter extends PagingDataAdapter<News, NewsAdapter.NewsViewHolder> {
+
+    public static final int LOADING_ITEM = 0;
+    public static final int MOVIE_ITEM = 0;
+
+    RequestManager glide;
+
+    public NewsAdapter(@NonNull DiffUtil.ItemCallback<News> diffCallback, RequestManager glide) {
+        super(diffCallback);
+        this.glide = glide;
+    }
+
+    @NonNull
+    @Override
+    public NewsViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        return new NewsViewHolder(SingleNewsItemBinding.inflate(
+                LayoutInflater.from(parent.getContext()),
+                parent,
+                false
+        ));
+    }
+
+    @Override
+    public void onBindViewHolder(@NonNull NewsViewHolder holder, int position) {
+        News news = getItem(position);
+        if (news != null) {
+            Log.d("URL", news.getUrlToImage());
+            glide.load(news.getUrlToImage()).
+                    into(holder.newsItemBinding.imageViewNews);
+            holder.newsItemBinding.textViewTitle.setText(news.getTitle().substring(0, 6));
+        }
+    }
+
+    @Override
+    public int getItemViewType(int position) {
+        return position == getItemCount() ? LOADING_ITEM : MOVIE_ITEM;
+    }
+
+    public static class NewsViewHolder extends RecyclerView.ViewHolder {
+        SingleNewsItemBinding newsItemBinding;
+        public NewsViewHolder(@NonNull SingleNewsItemBinding newsItemBinding) {
+            super(newsItemBinding.getRoot());
+            this.newsItemBinding = newsItemBinding;
+        }
+    }
+}