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Merge pull request #1009 from zsiegel/update-android-sample
Android - 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=".UIBindingActivity">
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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/UIBindingActivity.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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* Problem:
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* You have a data source (where that data is potentially expensive to obtain), and you want to
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* emit this data into a fragment. However, you want to gracefully deal with rotation changes and
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* not lose any data already emitted.
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* <p/>
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* You also want your UI to update accordingly to the data being emitted.
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*
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* @author zsiegel ([email protected])
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*/
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public class UIBindingActivity 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("UIBinding");
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setContentView(R.layout.ui_binding_activity);
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}
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@SuppressWarnings("ConstantConditions")
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public static class RetainedBindingFragment extends Fragment {
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private Button startButton;
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private Observable<String> request;
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private Subscription requestSubscription = Subscriptions.empty();
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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 RetainedBindingFragment() {
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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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requestSubscription.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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}
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});
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}
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private void start() {
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request = 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 (request != null) {
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final TextView textView = (TextView) getView().findViewById(android.R.id.text1);
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requestSubscription = request.map(new Func1<String, Boolean>() {
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//Consume the data that comes back and then signal that we are done
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@Override
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public Boolean call(String s) {
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textView.setText(s);
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return true;
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}
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}).startWith(false) //Before we receive data our request is not complete
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.subscribe(new Action1<Boolean>() {
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//We update the UI based on the state of the request
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@Override
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public void call(Boolean completed) {
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setRequestInProgress(completed);
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}
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});
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}
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}
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private void setRequestInProgress(boolean completed) {
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getActivity().setProgressBarIndeterminateVisibility(!completed);
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startButton.setEnabled(completed);
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}
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}
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}

‎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>

‎rxjava-contrib/rxjava-android-samples/samples/src/main/res/layout/ui_binding_activity.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.UIBindingActivity$RetainedBindingFragment"
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tools:layout="@layout/retained_fragment" />
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</RelativeLayout>

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