├── .gitignore
├── .idea
├── codeStyles
│ └── Project.xml
├── gradle.xml
├── misc.xml
└── runConfigurations.xml
├── app
├── .gitignore
├── build.gradle
├── proguard-rules.pro
└── src
│ ├── androidTest
│ └── java
│ │ └── com
│ │ └── codingwithmitch
│ │ └── rxjavaflatmapexample
│ │ └── ExampleInstrumentedTest.java
│ ├── main
│ ├── AndroidManifest.xml
│ ├── java
│ │ └── com
│ │ │ └── codingwithmitch
│ │ │ └── rxjavaflatmapexample
│ │ │ ├── MainActivity.java
│ │ │ ├── RecyclerAdapter.java
│ │ │ ├── models
│ │ │ ├── Comment.java
│ │ │ └── Post.java
│ │ │ └── requests
│ │ │ ├── RequestApi.java
│ │ │ └── ServiceGenerator.java
│ └── res
│ │ ├── drawable-v24
│ │ └── ic_launcher_foreground.xml
│ │ ├── drawable
│ │ ├── first.png
│ │ ├── ic_launcher_background.xml
│ │ ├── last.png
│ │ └── middle.png
│ │ ├── layout
│ │ ├── activity_main.xml
│ │ └── layout_post_list_item.xml
│ │ ├── mipmap-anydpi-v26
│ │ ├── ic_launcher.xml
│ │ └── ic_launcher_round.xml
│ │ ├── mipmap-hdpi
│ │ ├── ic_launcher.png
│ │ └── ic_launcher_round.png
│ │ ├── mipmap-mdpi
│ │ ├── ic_launcher.png
│ │ └── ic_launcher_round.png
│ │ ├── mipmap-xhdpi
│ │ ├── ic_launcher.png
│ │ └── ic_launcher_round.png
│ │ ├── mipmap-xxhdpi
│ │ ├── ic_launcher.png
│ │ └── ic_launcher_round.png
│ │ ├── mipmap-xxxhdpi
│ │ ├── ic_launcher.png
│ │ └── ic_launcher_round.png
│ │ └── values
│ │ ├── colors.xml
│ │ ├── strings.xml
│ │ └── styles.xml
│ └── test
│ └── java
│ └── com
│ └── codingwithmitch
│ └── rxjavaflatmapexample
│ └── ExampleUnitTest.java
├── build.gradle
├── gradle.properties
├── gradle
└── wrapper
│ ├── gradle-wrapper.jar
│ └── gradle-wrapper.properties
├── gradlew
├── gradlew.bat
└── settings.gradle
/.gitignore:
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1 | *.iml
2 | .gradle
3 | /local.properties
4 | /.idea/caches
5 | /.idea/libraries
6 | /.idea/modules.xml
7 | /.idea/workspace.xml
8 | /.idea/navEditor.xml
9 | /.idea/assetWizardSettings.xml
10 | .DS_Store
11 | /build
12 | /captures
13 | .externalNativeBuild
14 |
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/.idea/codeStyles/Project.xml:
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/.idea/runConfigurations.xml:
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/app/.gitignore:
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1 | /build
2 |
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/app/build.gradle:
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1 | apply plugin: 'com.android.application'
2 |
3 | android {
4 | compileSdkVersion 28
5 | defaultConfig {
6 | applicationId "com.codingwithmitch.rxjavaflatmapexample"
7 | minSdkVersion 21
8 | targetSdkVersion 28
9 | versionCode 1
10 | versionName "1.0"
11 | testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
12 | }
13 | buildTypes {
14 | release {
15 | minifyEnabled false
16 | proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
17 | }
18 | }
19 | }
20 |
21 | dependencies {
22 |
23 | def retrofitVersion = "2.5.0"
24 | def rxjava_version = '2.2.7'
25 | def rxandroid_version = '2.1.1'
26 | def recyclerview_version = "1.0.0"
27 |
28 |
29 | implementation fileTree(dir: 'libs', include: ['*.jar'])
30 | implementation 'androidx.appcompat:appcompat:1.0.0-beta01'
31 | implementation 'androidx.constraintlayout:constraintlayout:1.1.2'
32 | testImplementation 'junit:junit:4.12'
33 | androidTestImplementation 'androidx.test:runner:1.1.0-alpha4'
34 | androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0-alpha4'
35 |
36 | // Retrofit
37 | implementation "com.squareup.retrofit2:retrofit:$retrofitVersion"
38 | implementation "com.squareup.retrofit2:converter-gson:$retrofitVersion"
39 |
40 | // RxJava
41 | implementation "io.reactivex.rxjava2:rxjava:$rxjava_version"
42 |
43 | // RxJava Call Adapter
44 | implementation "com.squareup.retrofit2:adapter-rxjava2:2.5.0"
45 |
46 | // RxAndroid
47 | implementation "io.reactivex.rxjava2:rxandroid:$rxandroid_version"
48 |
49 | // Recyclerview
50 | implementation "androidx.recyclerview:recyclerview:$recyclerview_version"
51 | }
52 |
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/app/proguard-rules.pro:
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1 | # Add project specific ProGuard rules here.
2 | # You can control the set of applied configuration files using the
3 | # proguardFiles setting in build.gradle.
4 | #
5 | # For more details, see
6 | # http://developer.android.com/guide/developing/tools/proguard.html
7 |
8 | # If your project uses WebView with JS, uncomment the following
9 | # and specify the fully qualified class name to the JavaScript interface
10 | # class:
11 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
12 | # public *;
13 | #}
14 |
15 | # Uncomment this to preserve the line number information for
16 | # debugging stack traces.
17 | #-keepattributes SourceFile,LineNumberTable
18 |
19 | # If you keep the line number information, uncomment this to
20 | # hide the original source file name.
21 | #-renamesourcefileattribute SourceFile
22 |
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/app/src/androidTest/java/com/codingwithmitch/rxjavaflatmapexample/ExampleInstrumentedTest.java:
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1 | package com.codingwithmitch.rxjavaflatmapexample;
2 |
3 | import android.content.Context;
4 |
5 | import androidx.test.InstrumentationRegistry;
6 | import androidx.test.runner.AndroidJUnit4;
7 |
8 | import org.junit.Test;
9 | import org.junit.runner.RunWith;
10 |
11 | import static org.junit.Assert.*;
12 |
13 | /**
14 | * Instrumented test, which will execute on an Android device.
15 | *
16 | * @see Testing documentation
17 | */
18 | @RunWith(AndroidJUnit4.class)
19 | public class ExampleInstrumentedTest {
20 | @Test
21 | public void useAppContext() {
22 | // Context of the app under test.
23 | Context appContext = InstrumentationRegistry.getTargetContext();
24 |
25 | assertEquals("com.codingwithmitch.rxjavaflatmapexample", appContext.getPackageName());
26 | }
27 | }
28 |
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/app/src/main/AndroidManifest.xml:
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/app/src/main/java/com/codingwithmitch/rxjavaflatmapexample/MainActivity.java:
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1 | package com.codingwithmitch.rxjavaflatmapexample;
2 |
3 | import androidx.appcompat.app.AppCompatActivity;
4 | import androidx.recyclerview.widget.LinearLayoutManager;
5 | import androidx.recyclerview.widget.RecyclerView;
6 | import io.reactivex.Observable;
7 | import io.reactivex.ObservableSource;
8 | import io.reactivex.Observer;
9 | import io.reactivex.android.schedulers.AndroidSchedulers;
10 | import io.reactivex.disposables.CompositeDisposable;
11 | import io.reactivex.disposables.Disposable;
12 | import io.reactivex.functions.Function;
13 | import io.reactivex.functions.Predicate;
14 | import io.reactivex.schedulers.Schedulers;
15 |
16 | import android.os.Bundle;
17 | import android.util.Log;
18 |
19 | import com.codingwithmitch.rxjavaflatmapexample.models.Comment;
20 | import com.codingwithmitch.rxjavaflatmapexample.models.Post;
21 | import com.codingwithmitch.rxjavaflatmapexample.requests.ServiceGenerator;
22 |
23 | import java.util.List;
24 | import java.util.Random;
25 |
26 | public class MainActivity extends AppCompatActivity {
27 |
28 | private static final String TAG = "MainActivity";
29 |
30 | //ui
31 | private RecyclerView recyclerView;
32 |
33 | // vars
34 | private CompositeDisposable disposables = new CompositeDisposable();
35 | private RecyclerAdapter adapter;
36 |
37 |
38 | @Override
39 | protected void onCreate(Bundle savedInstanceState) {
40 | super.onCreate(savedInstanceState);
41 | setContentView(R.layout.activity_main);
42 | recyclerView = findViewById(R.id.recycler_view);
43 |
44 | initRecyclerView();
45 |
46 | getPostsObservable()
47 | .subscribeOn(Schedulers.io())
48 | .flatMap(new Function>() {
49 | @Override
50 | public ObservableSource apply(Post post) throws Exception {
51 | return getCommentsObservable(post);
52 | }
53 | })
54 | .observeOn(AndroidSchedulers.mainThread())
55 | .subscribe(new Observer() {
56 | @Override
57 | public void onSubscribe(Disposable d) {
58 | disposables.add(d);
59 | }
60 |
61 | @Override
62 | public void onNext(Post post) {
63 | updatePost(post);
64 | }
65 |
66 | @Override
67 | public void onError(Throwable e) {
68 | Log.e(TAG, "onError: ", e);
69 | }
70 |
71 | @Override
72 | public void onComplete() {
73 | }
74 | });
75 | }
76 |
77 | private Observable getPostsObservable(){
78 | return ServiceGenerator.getRequestApi()
79 | .getPosts()
80 | .subscribeOn(Schedulers.io())
81 | .observeOn(AndroidSchedulers.mainThread())
82 | .flatMap(new Function, ObservableSource>() {
83 | @Override
84 | public ObservableSource apply(final List posts) throws Exception {
85 | adapter.setPosts(posts);
86 | return Observable.fromIterable(posts)
87 | .subscribeOn(Schedulers.io());
88 | }
89 | });
90 | }
91 |
92 | private void updatePost(Post post){
93 | adapter.updatePost(post);
94 | }
95 |
96 | private Observable getCommentsObservable(final Post post){
97 | return ServiceGenerator.getRequestApi()
98 | .getComments(post.getId())
99 | .map(new Function, Post>() {
100 | @Override
101 | public Post apply(List comments) throws Exception {
102 |
103 | int delay = ((new Random()).nextInt(5) + 1) * 1000; // sleep thread for x ms
104 | Thread.sleep(delay);
105 | Log.d(TAG, "apply: sleeping thread " + Thread.currentThread().getName() + " for " + String.valueOf(delay)+ "ms");
106 |
107 | post.setComments(comments);
108 | return post;
109 | }
110 | })
111 | .subscribeOn(Schedulers.io());
112 |
113 | }
114 |
115 | private void initRecyclerView(){
116 | adapter = new RecyclerAdapter();
117 | recyclerView.setLayoutManager(new LinearLayoutManager(this));
118 | recyclerView.setAdapter(adapter);
119 | }
120 |
121 | @Override
122 | protected void onDestroy() {
123 | super.onDestroy();
124 | disposables.clear();
125 | }
126 | }
127 |
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/app/src/main/java/com/codingwithmitch/rxjavaflatmapexample/RecyclerAdapter.java:
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1 | package com.codingwithmitch.rxjavaflatmapexample;
2 |
3 | import android.view.LayoutInflater;
4 | import android.view.View;
5 | import android.view.ViewGroup;
6 | import android.widget.ProgressBar;
7 | import android.widget.TextView;
8 |
9 | import com.codingwithmitch.rxjavaflatmapexample.models.Post;
10 |
11 | import java.util.ArrayList;
12 | import java.util.List;
13 |
14 | import androidx.annotation.NonNull;
15 | import androidx.recyclerview.widget.RecyclerView;
16 |
17 | public class RecyclerAdapter extends RecyclerView.Adapter {
18 |
19 | private static final String TAG = "RecyclerAdapter";
20 |
21 | private List posts = new ArrayList<>();
22 |
23 | @NonNull
24 | @Override
25 | public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
26 | View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_post_list_item, null, false);
27 | return new MyViewHolder(view);
28 | }
29 |
30 | @Override
31 | public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
32 |
33 | holder.bind(posts.get(position));
34 | }
35 |
36 | @Override
37 | public int getItemCount() {
38 | return posts.size();
39 | }
40 |
41 | public void setPosts(List posts){
42 | this.posts = posts;
43 | notifyDataSetChanged();
44 | }
45 |
46 | public void updatePost(Post post){
47 | posts.set(posts.indexOf(post), post);
48 | notifyItemChanged(posts.indexOf(post));
49 | }
50 |
51 | public List getPosts(){
52 | return posts;
53 | }
54 |
55 | public class MyViewHolder extends RecyclerView.ViewHolder{
56 |
57 | TextView title, numComments;
58 | ProgressBar progressBar;
59 |
60 | public MyViewHolder(@NonNull View itemView) {
61 | super(itemView);
62 | title = itemView.findViewById(R.id.title);
63 | numComments = itemView.findViewById(R.id.num_comments);
64 | progressBar = itemView.findViewById(R.id.progress_bar);
65 | }
66 |
67 | public void bind(Post post){
68 | title.setText(post.getTitle());
69 |
70 | if(post.getComments() == null){
71 | showProgressBar(true);
72 | numComments.setText("");
73 | }
74 | else{
75 | showProgressBar(false);
76 | numComments.setText(String.valueOf(post.getComments().size()));
77 | }
78 | }
79 |
80 | private void showProgressBar(boolean showProgressBar){
81 | if(showProgressBar) {
82 | progressBar.setVisibility(View.VISIBLE);
83 | }
84 | else{
85 | progressBar.setVisibility(View.GONE);
86 | }
87 | }
88 | }
89 | }
90 |
91 |
92 |
93 |
94 |
95 |
96 |
97 |
98 |
99 |
100 |
101 |
102 |
103 |
104 |
105 |
106 |
107 |
108 |
109 |
110 |
111 |
112 |
113 |
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/app/src/main/java/com/codingwithmitch/rxjavaflatmapexample/models/Comment.java:
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1 | package com.codingwithmitch.rxjavaflatmapexample.models;
2 |
3 | import com.google.gson.annotations.Expose;
4 | import com.google.gson.annotations.SerializedName;
5 |
6 | public class Comment {
7 |
8 | @Expose
9 | @SerializedName("postId")
10 | private int postId;
11 |
12 | @Expose
13 | @SerializedName("id")
14 | private int id;
15 |
16 | @Expose
17 | @SerializedName("name")
18 | private String name;
19 |
20 | @Expose
21 | @SerializedName("email")
22 | private String email;
23 |
24 | @Expose
25 | @SerializedName("body")
26 | private String body;
27 |
28 | public Comment(int postId, int id, String name, String email, String body) {
29 | this.postId = postId;
30 | this.id = id;
31 | this.name = name;
32 | this.email = email;
33 | this.body = body;
34 | }
35 |
36 |
37 | public int getPostId() {
38 | return postId;
39 | }
40 |
41 | public void setPostId(int postId) {
42 | this.postId = postId;
43 | }
44 |
45 | public int getId() {
46 | return id;
47 | }
48 |
49 | public void setId(int id) {
50 | this.id = id;
51 | }
52 |
53 | public String getName() {
54 | return name;
55 | }
56 |
57 | public void setName(String name) {
58 | this.name = name;
59 | }
60 |
61 | public String getEmail() {
62 | return email;
63 | }
64 |
65 | public void setEmail(String email) {
66 | this.email = email;
67 | }
68 |
69 | public String getBody() {
70 | return body;
71 | }
72 |
73 | public void setBody(String body) {
74 | this.body = body;
75 | }
76 | }
77 |
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/app/src/main/java/com/codingwithmitch/rxjavaflatmapexample/models/Post.java:
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1 | package com.codingwithmitch.rxjavaflatmapexample.models;
2 |
3 | import com.google.gson.annotations.Expose;
4 | import com.google.gson.annotations.SerializedName;
5 |
6 | import java.util.List;
7 |
8 | public class Post {
9 |
10 | @SerializedName("userId")
11 | @Expose()
12 | private int userId;
13 |
14 | @SerializedName("id")
15 | @Expose()
16 | private int id;
17 |
18 | @SerializedName("title")
19 | @Expose()
20 | private String title;
21 |
22 | @SerializedName("body")
23 | @Expose()
24 | private String body;
25 |
26 | private List comments;
27 |
28 | public Post(int userId, int id, String title, String body, List comments) {
29 | this.userId = userId;
30 | this.id = id;
31 | this.title = title;
32 | this.body = body;
33 | this.comments = comments;
34 | }
35 |
36 | public int getUserId() {
37 | return userId;
38 | }
39 |
40 | public void setUserId(int userId) {
41 | this.userId = userId;
42 | }
43 |
44 | public int getId() {
45 | return id;
46 | }
47 |
48 | public void setId(int id) {
49 | this.id = id;
50 | }
51 |
52 | public String getTitle() {
53 | return title;
54 | }
55 |
56 | public void setTitle(String title) {
57 | this.title = title;
58 | }
59 |
60 | public String getBody() {
61 | return body;
62 | }
63 |
64 | public void setBody(String body) {
65 | this.body = body;
66 | }
67 |
68 | public List getComments() {
69 | return comments;
70 | }
71 |
72 | public void setComments(List comments) {
73 | this.comments = comments;
74 | }
75 |
76 | @Override
77 | public String toString() {
78 | return "Post{" +
79 | "userId=" + userId +
80 | ", id=" + id +
81 | ", title='" + title + '\'' +
82 | ", body='" + body + '\'' +
83 | '}';
84 | }
85 | }
86 |
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/app/src/main/java/com/codingwithmitch/rxjavaflatmapexample/requests/RequestApi.java:
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1 | package com.codingwithmitch.rxjavaflatmapexample.requests;
2 |
3 | import com.codingwithmitch.rxjavaflatmapexample.models.Comment;
4 | import com.codingwithmitch.rxjavaflatmapexample.models.Post;
5 |
6 | import java.util.List;
7 |
8 | import io.reactivex.Flowable;
9 | import io.reactivex.Observable;
10 | import okhttp3.ResponseBody;
11 | import retrofit2.http.GET;
12 | import retrofit2.http.Path;
13 |
14 | public interface RequestApi {
15 |
16 | @GET("posts")
17 | Observable> getPosts();
18 |
19 | @GET("posts/{id}/comments")
20 | Observable> getComments(
21 | @Path("id") int id
22 | );
23 | }
24 |
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/app/src/main/java/com/codingwithmitch/rxjavaflatmapexample/requests/ServiceGenerator.java:
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1 | package com.codingwithmitch.rxjavaflatmapexample.requests;
2 |
3 |
4 | import retrofit2.Retrofit;
5 | import retrofit2.adapter.rxjava2.RxJava2CallAdapterFactory;
6 | import retrofit2.converter.gson.GsonConverterFactory;
7 |
8 | public class ServiceGenerator {
9 |
10 | public static final String BASE_URL = "https://jsonplaceholder.typicode.com";
11 |
12 | private static Retrofit.Builder retrofitBuilder =
13 | new Retrofit.Builder()
14 | .baseUrl(BASE_URL)
15 | .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
16 | .addConverterFactory(GsonConverterFactory.create());
17 |
18 | private static Retrofit retrofit = retrofitBuilder.build();
19 |
20 | private static RequestApi requestApi = retrofit.create(RequestApi.class);
21 |
22 | public static RequestApi getRequestApi(){
23 | return requestApi;
24 | }
25 | }
26 |
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/app/src/main/res/drawable-v24/ic_launcher_foreground.xml:
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