Merge pull request #322 from mttkay/master

Update Android README.md

Author: benjchristensen

rxjava-contrib/rxjava-android/README.md

@@ -2,6 +2,15 @@
 
 Android specific bindings for Rx.
 
+This module adds a number of classes to RxJava that make writing reactive components in 
+Android applications easy and hassle free. More specifically, it
+
+- provides a `Scheduler` that schedules an `Observable` on a given Android `Handler` thread, particularly the main UI thread
+- provides base `Observer` implementations that make guarantees w.r.t. to reliable and thread-safe use throughout 
+      `Fragment` and `Activity` life-cycle callbacks (coming soon)
+- provides reusable, self-contained reactive components for common Android use cases and UI concerns (coming soon)
+
+
 # Binaries
 
 Binaries and dependency information for Maven, Ivy, Gradle and others can be found at [http://search.maven.org](http://search.maven.org/#search%7Cga%7C1%7Ca%3A%22hystrix-servo-metrics-publisher%22).
@@ -12,12 +21,60 @@ Example for [Maven](http://search.maven.org/#search%7Cga%7C1%7Ca%3A%22rxjava-and
 <dependency>
     <groupId>com.netflix.rxjava</groupId>
     <artifactId>rxjava-android</artifactId>
-    <version>x.y.z</version>
+    <version>0.10.1</version>
 </dependency>
 ```
 
 and for Ivy:
 
 ```xml
-<dependency org="com.netflix.rxjava" name="rxjava-android" rev="x.y.z" />
+<dependency org="com.netflix.rxjava" name="rxjava-android" rev="0.10.1" />
 ```
+
+# Sample usage
+
+We are working on a samples project which provides runnable code samples that demonstrate common Rx patterns and
+their use in Android applications.
+
+## Observing on the UI thread
+
+One of the most common operations when dealing with asynchronous tasks on Android is to observe the task's
+result or outcome on the main UI thread. Using vanilla Android, this would
+typically be accomplished with an `AsyncTask`. With RxJava instead you would declare your `Observable`
+to be observed on the main thread:
+
+    public class ReactiveFragment extends Fragment {
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        Observable.from("one", "two", "three", "four", "five")
+                .subscribeOn(Schedulers.newThread())
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe(/* an Observer */);
+    }
+ 
+This will execute the Observable on a new thread, and emit results through `onNext` on the main UI thread.
+   
+## Observing on arbitrary threads
+The previous sample is merely a specialization of a more general concept, namely binding asynchronous
+communication to an Android message loop using the `Handler` class. In order to observe an `Observable`
+on an arbitrary thread, create a `Handler` bound to that thread and use the `AndroidSchedulers.handlerThread`
+scheduler:
+
+    new Thread(new Runnable() {
+        @Override
+        public void run() {
+            final Handler handler = new Handler(); // bound to this thread
+            Observable.from("one", "two", "three", "four", "five")
+                    .subscribeOn(Schedulers.newThread())
+                    .observeOn(AndroidSchedulers.handlerThread(handler))
+                    .subscribe(/* an Observer */)
+                    
+            // perform work, ...
+        }
+    }, "custom-thread-1").start();
+
+This will execute the Observable on a new thread and emit results through `onNext` on "custom-thread-1".
+(This example is contrived since you could as well call `observeOn(Schedulers.currentThread())` but it
+shall suffice to illustrate the idea.)