Add sample for binding to list adapters in ListFragment

Author: mttkay

rxjava-contrib/rxjava-android-samples/samples/src/main/AndroidManifest.xml

@@ -20,6 +20,15 @@
         <activity
             android:name=".ListeningFragmentActivity">
 
+            <intent-filter>
+                <category android:name="android.intent.category.LAUNCHER"/>
+                <category android:name="android.intent.category.DEFAULT"/>
+                <action android:name="android.intent.action.MAIN"/>
+            </intent-filter>
+        </activity>
+        <activity
+            android:name=".ListFragmentActivity">
+
             <intent-filter>
                 <category android:name="android.intent.category.LAUNCHER"/>
                 <category android:name="android.intent.category.DEFAULT"/>

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

@@ -0,0 +1,75 @@
+package com.netflix.rxjava.android.samples;
+
+import android.app.Activity;
+import android.app.ListFragment;
+import android.os.Bundle;
+import android.widget.ArrayAdapter;
+
+import rx.Observable;
+import rx.Subscriber;
+
+import static rx.android.schedulers.AndroidSchedulers.mainThread;
+
+/**
+ * Problem:
+ * You have an asynchronous sequence that emits items to be displayed in a list. You want the data
+ * to survive rotation changes.
+ * <p/>
+ * Solution:
+ * Combine {@link android.app.Fragment#setRetainInstance(boolean)} in a ListFragment with
+ * {@link rx.android.schedulers.AndroidSchedulers#mainThread()} and an {@link rx.Observable.Operator}
+ * that binds to the list adapter.
+ */
+public class ListFragmentActivity extends Activity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setTitle("Lists");
+        setContentView(R.layout.list_fragment_activity);
+    }
+
+    @SuppressWarnings("ConstantConditions")
+    public static class RetainedListFragment extends ListFragment {
+
+        private ArrayAdapter<String> adapter;
+
+        public RetainedListFragment() {
+            setRetainInstance(true);
+        }
+
+        @Override
+        public void onCreate(Bundle savedInstanceState) {
+            super.onCreate(savedInstanceState);
+
+            adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1);
+            setListAdapter(adapter);
+            SampleObservables.numberStrings(1, 20, 250)
+                    .observeOn(mainThread())
+                    .lift(new BindAdapter())
+                    .subscribe();
+        }
+
+        private final class BindAdapter implements Observable.Operator<String, String> {
+            @Override
+            public Subscriber<? super String> call(Subscriber<? super String> subscriber) {
+                return new Subscriber<String>() {
+                    @Override
+                    public void onCompleted() {
+                        adapter.notifyDataSetChanged();
+                    }
+
+                    @Override
+                    public void onError(Throwable throwable) {
+
+                    }
+
+                    @Override
+                    public void onNext(String strings) {
+                        adapter.add(strings);
+                    }
+                };
+            }
+        }
+    }
+}

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

@@ -0,0 +1,13 @@
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context="com.netflix.rxjava.android.samples.ListeningFragmentActivity">
+
+    <fragment
+        android:tag="retained_list_fragment"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:name="com.netflix.rxjava.android.samples.ListFragmentActivity$RetainedListFragment" />
+
+</RelativeLayout>