├── .gitignore
├── .idea
├── encodings.xml
├── gradle.xml
├── misc.xml
├── modules.xml
├── runConfigurations.xml
└── vcs.xml
├── README.md
├── app
├── .gitignore
├── build.gradle
├── proguard-rules.pro
└── src
│ ├── androidTest
│ └── java
│ │ └── com
│ │ └── boisneyphilippe
│ │ └── rxapp
│ │ └── ExampleInstrumentedTest.java
│ ├── main
│ ├── AndroidManifest.xml
│ ├── java
│ │ └── com
│ │ │ └── boisneyphilippe
│ │ │ └── rxapp
│ │ │ ├── MainActivity.java
│ │ │ ├── MainFragment.java
│ │ │ └── RxJavaLoader.java
│ └── res
│ │ ├── drawable-v24
│ │ └── ic_launcher_foreground.xml
│ │ ├── drawable
│ │ ├── button_corner.xml
│ │ └── ic_launcher_background.xml
│ │ ├── layout
│ │ ├── activity_main.xml
│ │ └── fragment_main.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
│ └── boisneyphilippe
│ └── rxapp
│ └── ExampleUnitTest.java
├── build.gradle
├── demo
└── demo.gif
├── gradle.properties
├── gradle
└── wrapper
│ ├── gradle-wrapper.jar
│ └── gradle-wrapper.properties
├── gradlew
├── gradlew.bat
└── settings.gradle
/.gitignore:
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2 | .gradle
3 | /local.properties
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7 | /build
8 | /captures
9 | .externalNativeBuild
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/README.md:
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1 | # RxJava2WithLoader
2 | A simple android app that handles rotations as proper as possible (with Loaders & ConnectableObservable), when working with RxJava2.
3 |
4 | The related tutorial is available here: [Medium Article.](https://medium.com/@Phil_Boisney/rxjava-2-android-how-to-proper-handle-rotations-with-connectableobservable-loader-9356ff47df61)
5 |
6 | ## PREVIEW
7 | 
8 |
9 |
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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 26
5 | defaultConfig {
6 | applicationId "com.boisneyphilippe.rxapp"
7 | minSdkVersion 17
8 | targetSdkVersion 26
9 | versionCode 1
10 | versionName "1.0"
11 | testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
12 | }
13 | buildTypes {
14 | release {
15 | minifyEnabled false
16 | proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
17 | }
18 | }
19 | }
20 |
21 | dependencies {
22 | implementation fileTree(dir: 'libs', include: ['*.jar'])
23 | implementation 'com.android.support:appcompat-v7:26.1.0'
24 | implementation 'com.android.support.constraint:constraint-layout:1.0.2'
25 | implementation 'com.android.support:support-v4:26.1.0'
26 | testImplementation 'junit:junit:4.12'
27 | androidTestImplementation 'com.android.support.test:runner:1.0.1'
28 | androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
29 | implementation 'com.jakewharton:butterknife:8.8.1'
30 | annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'
31 | compile 'io.reactivex.rxjava2:rxjava:2.1.7'
32 | compile 'io.reactivex.rxjava2:rxandroid:2.0.1'
33 | }
34 |
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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/boisneyphilippe/rxapp/ExampleInstrumentedTest.java:
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1 | package com.boisneyphilippe.rxapp;
2 |
3 | import android.content.Context;
4 | import android.support.test.InstrumentationRegistry;
5 | import android.support.test.runner.AndroidJUnit4;
6 |
7 | import org.junit.Test;
8 | import org.junit.runner.RunWith;
9 |
10 | import static org.junit.Assert.*;
11 |
12 | /**
13 | * Instrumented test, which will execute on an Android device.
14 | *
15 | * @see Testing documentation
16 | */
17 | @RunWith(AndroidJUnit4.class)
18 | public class ExampleInstrumentedTest {
19 | @Test
20 | public void useAppContext() throws Exception {
21 | // Context of the app under test.
22 | Context appContext = InstrumentationRegistry.getTargetContext();
23 |
24 | assertEquals("com.boisneyphilippe.rxapp", appContext.getPackageName());
25 | }
26 | }
27 |
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/app/src/main/AndroidManifest.xml:
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/app/src/main/java/com/boisneyphilippe/rxapp/MainActivity.java:
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1 | package com.boisneyphilippe.rxapp;
2 |
3 | import android.support.v7.app.AppCompatActivity;
4 | import android.os.Bundle;
5 |
6 | public class MainActivity extends AppCompatActivity {
7 |
8 | private MainFragment mainFragment;
9 |
10 | @Override
11 | protected void onCreate(Bundle savedInstanceState) {
12 | super.onCreate(savedInstanceState);
13 | setContentView(R.layout.activity_main);
14 |
15 | this.configureAndShowMainFragment();
16 | }
17 |
18 | // -------------------
19 | // CONFIGURATION
20 | // -------------------
21 |
22 | private void configureAndShowMainFragment(){
23 |
24 | mainFragment = (MainFragment) getSupportFragmentManager().findFragmentById(R.id.activity_main_frame_layout);
25 |
26 | if (mainFragment == null) {
27 | mainFragment = new MainFragment();
28 | getSupportFragmentManager().beginTransaction()
29 | .add(R.id.activity_main_frame_layout, mainFragment)
30 | .commit();
31 | }
32 | }
33 | }
34 |
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/app/src/main/java/com/boisneyphilippe/rxapp/MainFragment.java:
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1 | package com.boisneyphilippe.rxapp;
2 |
3 |
4 | import android.os.Bundle;
5 | import android.support.v4.app.Fragment;
6 | import android.util.Log;
7 | import android.view.LayoutInflater;
8 | import android.view.View;
9 | import android.view.ViewGroup;
10 | import android.widget.TextView;
11 |
12 | import java.util.concurrent.TimeUnit;
13 |
14 | import butterknife.BindView;
15 | import butterknife.ButterKnife;
16 | import butterknife.OnClick;
17 | import io.reactivex.Observable;
18 | import io.reactivex.android.schedulers.AndroidSchedulers;
19 | import io.reactivex.disposables.Disposable;
20 | import io.reactivex.observables.ConnectableObservable;
21 | import io.reactivex.observers.DisposableObserver;
22 | import io.reactivex.schedulers.Schedulers;
23 |
24 |
25 | /**
26 | * A simple {@link Fragment} subclass.
27 | */
28 | public class MainFragment extends Fragment {
29 |
30 | // FOR DESIGN
31 | @BindView(R.id.fragment_main_textview) TextView textView;
32 |
33 | // FOR DATA
34 | private Disposable disposable;
35 | private static int LOADER_ID = 10; //or whatever you want...
36 |
37 | public MainFragment() { }
38 |
39 | @Override
40 | public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
41 | View view = inflater.inflate(R.layout.fragment_main, container, false);
42 | ButterKnife.bind(this, view);
43 | this.resumeObservableIfPossible();
44 | return view;
45 | }
46 |
47 | @Override
48 | public void onDestroy() {
49 | if (this.disposable != null) this.disposable.dispose();
50 | super.onDestroy();
51 | }
52 |
53 | // -----------------
54 | // ACTIONS
55 | // -----------------
56 |
57 | @OnClick(R.id.fragment_main_button)
58 | public void submit(View view) {
59 | this.executeObservable();
60 | }
61 |
62 | // ------------------
63 | // RX JAVA
64 | // ------------------
65 |
66 | private Observable getObservable(){
67 | return Observable.just("Long process is ended !")
68 | .delay(10, TimeUnit.SECONDS)
69 | .subscribeOn(Schedulers.io())
70 | .observeOn(AndroidSchedulers.mainThread());
71 | }
72 |
73 | private DisposableObserver getSubscriber(){
74 | return new DisposableObserver() {
75 | @Override
76 | public void onNext(String result) {
77 | Log.e("TAG","On Next");
78 | updateUIWhenStoppingOperation(result);
79 | }
80 |
81 | @Override
82 | public void onError(Throwable e) {
83 | Log.e("TAG","On Error");
84 | }
85 |
86 | @Override
87 | public void onComplete() {
88 | Log.e("TAG","On Complete !!");
89 | }
90 | };
91 | }
92 |
93 | // -----
94 |
95 | private void executeObservable(){
96 | this.updateUIWhenStartingOperation();
97 | ConnectableObservable connectableObservable = getObservable()
98 | .compose(RxJavaLoader.compose(this, LOADER_ID))
99 | .publish();
100 | connectableObservable.subscribeWith(getSubscriber());
101 | this.disposable = connectableObservable.connect();
102 | }
103 |
104 | private void resumeObservableIfPossible(){
105 | Observable observable = RxJavaLoader.initializeLoader(this, LOADER_ID, getObservable());
106 | if (observable != null){
107 | this.updateUIWhenStartingOperation();
108 | observable.publish();
109 | this.disposable = observable.subscribeWith(getSubscriber());
110 | }
111 | }
112 |
113 | // ------------------
114 | // UPDATE UI
115 | // ------------------
116 |
117 | private void updateUIWhenStartingOperation(){
118 | this.textView.setText("Starting long process...");
119 | }
120 |
121 | private void updateUIWhenStoppingOperation(String result){
122 | this.textView.setText(result);
123 | }
124 | }
125 |
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/app/src/main/java/com/boisneyphilippe/rxapp/RxJavaLoader.java:
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1 | package com.boisneyphilippe.rxapp;
2 |
3 | import android.content.Context;
4 | import android.os.Bundle;
5 | import android.support.annotation.Nullable;
6 | import android.support.v4.app.Fragment;
7 | import android.support.v4.app.LoaderManager;
8 | import android.support.v4.content.Loader;
9 |
10 | import io.reactivex.Observable;
11 | import io.reactivex.ObservableSource;
12 | import io.reactivex.ObservableTransformer;
13 | import io.reactivex.disposables.Disposable;
14 | import io.reactivex.observers.DisposableObserver;
15 | import io.reactivex.subjects.BehaviorSubject;
16 |
17 | /**
18 | * Created by Philippe on 16/12/2017.
19 | */
20 |
21 | public class RxJavaLoader extends Loader {
22 |
23 | private final Observable observable;
24 | private final BehaviorSubject cache = BehaviorSubject.create();
25 |
26 | private Disposable disposable;
27 |
28 | private RxJavaLoader(Context context, Observable observable) {
29 | super(context);
30 | this.observable = observable;
31 | }
32 |
33 | public static ObservableTransformer compose(final Fragment fragment, final int id) {
34 | return new ObservableTransformer() {
35 | @Override
36 | public ObservableSource apply(Observable upstream) {
37 | return create(fragment, id, upstream);
38 | }
39 | };
40 | }
41 |
42 |
43 | public static Observable create(Fragment fragment, int id, Observable observable) {
44 | LoaderManager loaderManager = fragment.getLoaderManager();
45 |
46 | CreateLoaderCallback createLoaderCallback = new CreateLoaderCallback<>(fragment.getContext(), observable);
47 |
48 | loaderManager.restartLoader(id, null, createLoaderCallback);
49 |
50 | RxJavaLoader rxLoader = (RxJavaLoader) loaderManager.getLoader(id);
51 | return rxLoader.cache.hide();
52 | }
53 |
54 | @Nullable
55 | public static Observable initializeLoader(Fragment fragment, int id, Observable observable){
56 | LoaderManager loaderManager = fragment.getLoaderManager();
57 | CreateLoaderCallback createLoaderCallback = new CreateLoaderCallback<>(fragment.getContext(), observable);
58 |
59 | if (loaderManager.getLoader(id) != null) {
60 | loaderManager.initLoader(id, null, createLoaderCallback);
61 | }
62 |
63 | RxJavaLoader rxLoader = (RxJavaLoader) loaderManager.getLoader(id);
64 | if (rxLoader != null && !rxLoader.cache.hasComplete()){
65 | return rxLoader.cache.hide();
66 | } else {
67 | return null;
68 | }
69 | }
70 |
71 | @Override
72 | protected void onStartLoading() {
73 | super.onStartLoading();
74 | disposable = observable.subscribeWith(cache).subscribeWith(new DisposableObserver() {
75 | @Override
76 | public void onNext(T t) { }
77 |
78 | @Override
79 | public void onError(Throwable e) { }
80 |
81 | @Override
82 | public void onComplete() { }
83 | });
84 | }
85 |
86 | @Override
87 | protected void onReset() {
88 | super.onReset();
89 | disposable.dispose();
90 | }
91 |
92 | private static class CreateLoaderCallback implements LoaderManager.LoaderCallbacks {
93 |
94 | private final Context context;
95 | private final Observable observable;
96 |
97 | public CreateLoaderCallback(Context context, Observable observable) {
98 | this.context = context;
99 | this.observable = observable;
100 | }
101 |
102 | @Override
103 | public Loader onCreateLoader(int id, Bundle args) {
104 | return new RxJavaLoader<>(context, observable);
105 | }
106 |
107 | @Override
108 | public void onLoadFinished(Loader loader, T data) { /* nothing */ }
109 |
110 | @Override
111 | public void onLoaderReset(Loader loader) { /* nothing */ }
112 | }
113 | }
114 |
115 |
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/app/src/main/res/drawable-v24/ic_launcher_foreground.xml:
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