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Zachary Siegel
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Adding a new RetainedFragment example
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‎rxjava-contrib/rxjava-android-samples/samples/src/main/AndroidManifest.xml

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android:theme="@style/AppTheme"
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android:label="@string/app_name">
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<activity
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android:name=".RetainedFragmentActivity">
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android:name=".RetainedFragmentActivityV2">
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<intent-filter>
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<category android:name="android.intent.category.LAUNCHER"/>
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<category android:name="android.intent.category.DEFAULT"/>
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<action android:name="android.intent.action.MAIN"/>
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</intent-filter>
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</activity>
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<activity
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android:name=".RetainedFragmentActivity">
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<intent-filter>
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<category android:name="android.intent.category.LAUNCHER"/>

‎rxjava-contrib/rxjava-android-samples/samples/src/main/java/com/netflix/rxjava/android/samples/RetainedFragmentActivityV2.java

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package com.netflix.rxjava.android.samples;
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import android.app.Activity;
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import android.app.Fragment;
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import android.os.Bundle;
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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.view.Window;
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import android.widget.Button;
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import android.widget.TextView;
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import org.json.JSONException;
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import org.json.JSONObject;
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import rx.Observable;
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import rx.Subscription;
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import rx.android.schedulers.AndroidSchedulers;
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import rx.functions.Action1;
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import rx.functions.Func1;
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import rx.subscriptions.Subscriptions;
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/**
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* A retained fragment whose goals are below
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*
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* 1) gracefully handle rotation - not losing any data
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* 2) gracefully handle the user moving in and out of the app
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* 3) use a button or trigger of some sort to start the observable, something more in line with typical use
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* 4) ensure that the callbacks are not called if the user moves away from the fragment
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*
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* @author zsiegel ([email protected])
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*/
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public class RetainedFragmentActivityV2 extends Activity {
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
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setTitle("Fake API call V2");
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setContentView(R.layout.retained_fragment_activity_v2);
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}
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@SuppressWarnings("ConstantConditions")
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public static class RetainedFragmentV2 extends Fragment {
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private Observable<String> observable;
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private Subscription subscription = Subscriptions.empty();
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private Button startButton;
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private boolean progressVisiblity;
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// in a production app, you don't want to have JSON parser code in your fragment,
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// but we'll simplify a little here
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private static final Func1<String, String> PARSE_JSON = new Func1<String, String>() {
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@Override
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public String call(String json) {
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try {
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JSONObject jsonObject = new JSONObject(json);
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return String.valueOf(jsonObject.getInt("result"));
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} catch (JSONException e) {
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throw new RuntimeException(e);
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}
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}
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};
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public RetainedFragmentV2() {
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setRetainInstance(true);
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}
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/**
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* We un-subscribe whenever we are paused
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*/
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@Override
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public void onPause() {
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subscription.unsubscribe();
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super.onPause();
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}
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/**
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* We re-subscribe whenever we are resumed
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*/
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@Override
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public void onResume() {
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super.onResume();
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subscribe();
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}
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@Override
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public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
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return inflater.inflate(R.layout.retained_fragment_v2, container, false);
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}
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@Override
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public void onViewCreated(final View view, Bundle savedInstanceState) {
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super.onViewCreated(view, savedInstanceState);
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final TextView textView = (TextView)getView().findViewById(android.R.id.text1);
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startButton = (Button) view.findViewById(R.id.button);
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startButton.setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View v) {
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textView.setText("");
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start();
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startButton.setEnabled(false);
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}
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});
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}
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private void start() {
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progressVisiblity = true;
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observable = SampleObservables
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.fakeApiCall(5000)
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.map(PARSE_JSON)
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.observeOn(AndroidSchedulers.mainThread())
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.cache();
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subscribe();
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}
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/**
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* We subscribe/re-subscribe here
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*/
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private void subscribe() {
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if (observable != null) {
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getActivity().setProgressBarIndeterminateVisibility(progressVisiblity);
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final TextView textView = (TextView)getView().findViewById(android.R.id.text1);
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subscription = observable.subscribe(new Action1<String>() {
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@Override
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public void call(String result) {
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textView.setText(result);
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progressVisiblity = false;
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getActivity().setProgressBarIndeterminateVisibility(progressVisiblity);
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startButton.setEnabled(true);
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}
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});
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}
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}
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}
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}

‎rxjava-contrib/rxjava-android-samples/samples/src/main/res/layout/retained_fragment_activity_v2.xml

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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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tools:context="com.netflix.rxjava.android.samples.RetainedFragmentActivity">
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<fragment
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android:tag="retained_fragment_v2"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:name="com.netflix.rxjava.android.samples.RetainedFragmentActivityV2$RetainedFragmentV2"
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tools:layout="@layout/retained_fragment" />
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</RelativeLayout>

‎rxjava-contrib/rxjava-android-samples/samples/src/main/res/layout/retained_fragment_v2.xml

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<?xml version="1.0" encoding="utf-8"?>
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="match_parent"
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android:layout_height="match_parent">
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<TextView
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android:id="@android:id/text1"
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android:layout_centerInParent="true"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content" />
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<Button
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android:id="@+id/button"
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android:text="start!"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"/>
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</LinearLayout>

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