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Kaushik Gopal
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merge: networking example with volley (courtesy: offbye)
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‎README.md‎

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@@ -41,6 +41,11 @@ This is the debounce/throttleWithTimeout method in RxJava.
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Since it was a presentation, Jake only put up the most important code snippets in [his slides](https://speakerdeck.com/jakewharton/2014-1). Also he uses Java 8 in them, so I flushed those examples out in ~~good~~ old Java 6. (Note: you're most likely to hit the GitHub API quota pretty fast so send in an OAuth-token as a parameter if you want to keep running these examples often).
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### Volley Demo
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[Volley](http://developer.android.com/training/volley/index.html) is another networking library introduced by [Google at IO '13](https://www.youtube.com/watch?v=yhv8l9F44qo). A kind citizen of github contributed this example so we know how to integrate Volley with RxJava.
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### Orchestrating Observables. Make parallel network calls, then combine the result into a single data point (flatmap + zip)
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The below ascii diagram expresses the intention of our next example with panache. f1,f2,3,f4,f5 are essentially network calls that when made, give back a result that's needed for a future calculation.

‎app/build.gradle‎

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compile 'com.squareup.retrofit2:converter-gson:2.0.0-beta3'
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compile 'com.squareup.okhttp3:okhttp:3.0.1'
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compile 'com.squareup.okhttp3:okhttp-urlconnection:3.0.1'
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compile 'com.mcxiaoke.volley:library:1.0.19'
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debugCompile 'com.squareup.leakcanary:leakcanary-android:1.3'
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releaseCompile 'com.squareup.leakcanary:leakcanary-android-no-op:1.3'
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}
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android {
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compileSdkVersion 23
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buildToolsVersion '23.0.1'
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buildToolsVersion '23.0.2'
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defaultConfig {
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applicationId "com.morihacky.android.rxjava"

‎app/src/main/java/com/morihacky/android/rxjava/MyApp.java‎

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package com.morihacky.android.rxjava;
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import android.app.Application;
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import com.morihacky.android.rxjava.volley.MyVolley;
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import com.squareup.leakcanary.LeakCanary;
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import com.squareup.leakcanary.RefWatcher;
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import timber.log.Timber;
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_instance = (MyApp) getApplicationContext();
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_refWatcher = LeakCanary.install(this);
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// Initialize Volley
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MyVolley.init(this);
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Timber.plant(new Timber.DebugTree());
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}
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}

‎app/src/main/java/com/morihacky/android/rxjava/fragments/MainFragment.java‎

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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 com.morihacky.android.rxjava.R;
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import com.morihacky.android.rxjava.rxbus.RxBusDemoFragment;
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import butterknife.ButterKnife;
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import butterknife.OnClick;
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import com.morihacky.android.rxjava.volley.VolleyDemoFragment;
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public class MainFragment
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extends BaseFragment {
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//clickedOn(new RotationPersist1Fragment());
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}
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@OnClick(R.id.btn_demo_volley)
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void demoVolleyRequest() {
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clickedOn(new VolleyDemoFragment());
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}
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private void clickedOn(@NonNull Fragment fragment) {
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final String tag = fragment.getClass().toString();
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getActivity().getSupportFragmentManager()

‎app/src/main/java/com/morihacky/android/rxjava/volley/MyVolley.java‎

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package com.morihacky.android.rxjava.volley;
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import android.content.Context;
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import com.android.volley.RequestQueue;
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import com.android.volley.toolbox.Volley;
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/**
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* Helper class that is used to provide references to initialized RequestQueue(s) and ImageLoader(s)
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*
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* @author Ognyan Bankov
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*/
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public class MyVolley {
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private static RequestQueue mRequestQueue;
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private MyVolley() {
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// no instances
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}
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public static void init(Context context) {
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mRequestQueue = Volley.newRequestQueue(context);
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}
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public static RequestQueue getRequestQueue() {
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if (mRequestQueue != null) {
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return mRequestQueue;
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} else {
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throw new IllegalStateException("RequestQueue not initialized");
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}
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}
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}

‎app/src/main/java/com/morihacky/android/rxjava/volley/VolleyDemoFragment.java‎

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package com.morihacky.android.rxjava.volley;
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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 android.support.annotation.Nullable;
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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 android.widget.ListView;
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import butterknife.Bind;
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import butterknife.ButterKnife;
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import butterknife.OnClick;
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import com.android.volley.Request;
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import com.android.volley.VolleyError;
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import com.android.volley.toolbox.JsonObjectRequest;
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import com.android.volley.toolbox.RequestFuture;
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import com.morihacky.android.rxjava.R;
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import com.morihacky.android.rxjava.fragments.BaseFragment;
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import com.morihacky.android.rxjava.wiring.LogAdapter;
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import java.nio.charset.Charset;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.concurrent.ExecutionException;
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import org.json.JSONObject;
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import rx.Observable;
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import rx.Observer;
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import rx.android.schedulers.AndroidSchedulers;
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import rx.functions.Func0;
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import rx.schedulers.Schedulers;
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import rx.subscriptions.CompositeSubscription;
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import timber.log.Timber;
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public class VolleyDemoFragment
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extends BaseFragment {
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public static final String TAG = "VolleyDemoFragment";
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@Bind(R.id.list_threading_log) ListView _logsList;
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private List<String> _logs;
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private LogAdapter _adapter;
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private CompositeSubscription _compositeSubscription = new CompositeSubscription();
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@Override
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public View onCreateView(LayoutInflater inflater,
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@Nullable ViewGroup container,
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@Nullable Bundle savedInstanceState) {
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View layout = inflater.inflate(R.layout.fragment_volley, container, false);
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ButterKnife.bind(this, layout);
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return layout;
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}
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@Override
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public void onActivityCreated(@Nullable Bundle savedInstanceState) {
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super.onActivityCreated(savedInstanceState);
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_setupLogger();
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}
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@Override
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public void onPause() {
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super.onPause();
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_compositeSubscription.unsubscribe();
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}
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public Observable<JSONObject> newGetRouteData() {
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return Observable.defer(new Func0<Observable<JSONObject>>() {
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@Override
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public Observable<JSONObject> call() {
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try {
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return Observable.just(getRouteData());
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} catch (InterruptedException | ExecutionException e) {
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Log.e("routes", e.getMessage());
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return Observable.error(e);
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}
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}
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});
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}
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@OnClick(R.id.btn_start_operation)
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void startRequest() {
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startVolleyRequest();
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}
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private void startVolleyRequest() {
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_compositeSubscription.add(newGetRouteData().subscribeOn(Schedulers.io())
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.observeOn(AndroidSchedulers.mainThread())
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.subscribe(new Observer<JSONObject>() {
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@Override
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public void onCompleted() {
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Log.e(TAG, "onCompleted");
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Timber.d("----- onCompleted");
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_log("onCompleted ");
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}
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@Override
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public void onError(Throwable e) {
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VolleyError cause = (VolleyError) e.getCause();
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String s = new String(cause.networkResponse.data, Charset.forName("UTF-8"));
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Log.e(TAG, s);
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Log.e(TAG, cause.toString());
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_log("onError " + s);
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}
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@Override
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public void onNext(JSONObject jsonObject) {
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Log.e(TAG, "onNext " + jsonObject.toString());
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_log("onNext " + jsonObject.toString());
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}
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}));
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}
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private JSONObject getRouteData() throws ExecutionException, InterruptedException {
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RequestFuture<JSONObject> future = RequestFuture.newFuture();
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String url = "http://www.weather.com.cn/adat/sk/101010100.html";
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final Request.Priority priority = Request.Priority.IMMEDIATE;
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JsonObjectRequest req = new JsonObjectRequest(Request.Method.GET, url, future, future);
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MyVolley.getRequestQueue().add(req);
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return future.get();
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}
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// -----------------------------------------------------------------------------------
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// Methods that help wiring up the example (irrelevant to RxJava)
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private void _setupLogger() {
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_logs = new ArrayList<>();
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_adapter = new LogAdapter(getActivity(), new ArrayList<String>());
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_logsList.setAdapter(_adapter);
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}
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private void _log(String logMsg) {
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if (_isCurrentlyOnMainThread()) {
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_logs.add(0, logMsg + " (main thread) ");
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_adapter.clear();
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_adapter.addAll(_logs);
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} else {
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_logs.add(0, logMsg + " (NOT main thread) ");
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// You can only do below stuff on main thread.
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new Handler(Looper.getMainLooper()).post(new Runnable() {
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@Override
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public void run() {
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_adapter.clear();
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_adapter.addAll(_logs);
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}
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});
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}
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}
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private boolean _isCurrentlyOnMainThread() {
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return Looper.myLooper() == Looper.getMainLooper();
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}
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}

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

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android:layout_width="match_parent"
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android:text="@string/btn_demo_rotation_persist"
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/>
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<Button
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android:id="@+id/btn_demo_volley"
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android:layout_height="wrap_content"
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android:layout_width="match_parent"
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android:text="@string/btn_demo_volley"
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/>
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</LinearLayout>
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</ScrollView>

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

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<?xml version="1.0" encoding="utf-8"?>
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<LinearLayout
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android:orientation="vertical"
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android:layout_height="match_parent"
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android:layout_width="match_parent"
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xmlns:android="http://schemas.android.com/apk/res/android"
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>
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<TextView
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android:layout_height="wrap_content"
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android:layout_width="match_parent"
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android:padding="10dp"
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android:gravity="center"
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android:text="@string/msg_demo_volley"
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/>
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<Button
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android:id="@+id/btn_start_operation"
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android:layout_height="wrap_content"
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android:layout_width="match_parent"
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android:layout_marginLeft="90dp"
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android:layout_marginRight="90dp"
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android:textSize="16dp"
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android:text="tap me"
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/>
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<ListView
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android:id="@+id/list_threading_log"
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android:layout_height="match_parent"
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android:layout_width="match_parent"
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/>
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</LinearLayout>

‎app/src/main/res/values/strings.xml‎

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<string name="btn_demo_timing">Variations of timing/intervals/delays</string>
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<string name="btn_demo_exponential_backoff">Exponential backoff</string>
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<string name="btn_demo_rotation_persist">Rotation persist</string>
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<string name="btn_demo_volley">Volley request demo</string>
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<string name="msg_demo_volley">This is a Volley request demo</string>
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<string name="msg_demo_concurrency_schedulers">This is a demo of how long running operations can be offloaded to a background thread. After the operation is done, we resume back on the main thread. All using RxJava! \n\n To really see this shine. Hit the button multiple times and see how the button click which is a ui operation is never blocked because the long operation only runs in the background</string>
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<string name="msg_demo_buffer">This is a demo of how events can be accumulated using the "buffer" operation. Tap the button below repetitively and you will notice in the logs that button taps are collected over a span of 2s and printed below.</string>
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<string name="msg_demo_debounce">As you type in the input box, it will not shoot out log messages at every single input character change, but rather only pick the last one.</string>

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