Introduce MvRx in the application + start managing UI

matrix-sdk-android-rx/src/main/AndroidManifest.xml

@@ -0,0 +1,2 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="im.vector.matrix.rx" />

matrix-sdk-android-rx/src/main/java/im/vector/matrix/rx/LiveDataObservable.kt

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+package im.vector.matrix.rx
+
+import android.arch.lifecycle.LiveData
+import android.arch.lifecycle.Observer
+import io.reactivex.Observable
+import io.reactivex.android.MainThreadDisposable
+
+private class LiveDataObservable<T>(
+        private val liveData: LiveData<T>,
+        private val valueIfNull: T? = null
+) : Observable<T>() {
+
+    override fun subscribeActual(observer: io.reactivex.Observer<in T>) {
+        val relay = RemoveObserverInMainThread(observer)
+        observer.onSubscribe(relay)
+        liveData.observeForever(relay)
+    }
+
+    private inner class RemoveObserverInMainThread(private val observer: io.reactivex.Observer<in T>)
+        : MainThreadDisposable(), Observer<T> {
+
+        override fun onChanged(t: T?) {
+            if (!isDisposed) {
+                if (t == null) {
+                    if (valueIfNull != null) {
+                        observer.onNext(valueIfNull)
+                    } else {
+                        observer.onError(NullPointerException(
+                                "convert liveData value t to RxJava onNext(t), t cannot be null"))
+                    }
+                } else {
+                    observer.onNext(t)
+                }
+            }
+        }
+
+        override fun onDispose() {
+            liveData.removeObserver(this)
+        }
+    }
+}
+
+fun <T> LiveData<T>.asObservable(): Observable<T> {
+    return LiveDataObservable(this)
+}

matrix-sdk-android-rx/src/main/java/im/vector/matrix/rx/RxSession.kt

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+package im.vector.matrix.rx
+
+import im.vector.matrix.android.api.session.Session
+import im.vector.matrix.android.api.session.room.model.RoomSummary
+import io.reactivex.Observable
+
+class RxSession(private val session: Session) {
+
+    fun liveRoomSummaries(): Observable<List<RoomSummary>> {
+        return session.liveRoomSummaries().asObservable()
+    }
+
+}
+
+fun Session.rx(): RxSession {
+    return RxSession(this)
+}

matrix-sdk-android-rx/src/main/res/values/strings.xml

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+<resources>
+    <string name="app_name">matrix-sdk-android-rx</string>
+</resources>