Merge branch 'master' into version-4.0.0-dev

Change-Id: Ia775e4bbc7beccf9f1dd1cf6ed3922e208e695cd

Author: samtstern

README.md

@@ -46,17 +46,17 @@ libraries.
 
 ```groovy
 dependencies {
-// FirebaseUI for Firebase Realtime Database
-implementation 'com.firebaseui:firebase-ui-database:3.3.1'
+    // FirebaseUI for Firebase Realtime Database
+    implementation 'com.firebaseui:firebase-ui-database:3.3.1'
 
-// FirebaseUI for Cloud Firestore
-implementation 'com.firebaseui:firebase-ui-firestore:3.3.1'
+    // FirebaseUI for Cloud Firestore
+    implementation 'com.firebaseui:firebase-ui-firestore:3.3.1'
 
-// FirebaseUI for Firebase Auth
-implementation 'com.firebaseui:firebase-ui-auth:3.3.1'
+    // FirebaseUI for Firebase Auth
+    implementation 'com.firebaseui:firebase-ui-auth:3.3.1'
 
-// FirebaseUI for Cloud Storage
-implementation 'com.firebaseui:firebase-ui-storage:3.3.1'
+    // FirebaseUI for Cloud Storage
+    implementation 'com.firebaseui:firebase-ui-storage:3.3.1'
 }
 ```
 
@@ -202,14 +202,14 @@ Just add the following to your `build.gradle`:
 
 ```groovy
 repositories {
-  maven { url "https://oss.jfrog.org/artifactory/oss-release-local" }
+  maven { url "https://oss.jfrog.org/artifactory/oss-snapshot-local" }
 }
 ```
 
 Then you can depend on snapshot versions:
 
 ```groovy
-implementation 'com.firebaseui:firebase-ui-auth:3.2.2-SNAPSHOT`
+implementation 'com.firebaseui:firebase-ui-auth:4.0.0-SNAPSHOT`
 ```
 
 You can see which `SNAPSHOT` builds are avaiable here:

app/src/main/java/com/firebase/uidemo/database/firestore/FirestoreChatActivity.java

@@ -46,7 +46,8 @@ public class FirestoreChatActivity extends AppCompatActivity
     private static final CollectionReference sChatCollection =
             FirebaseFirestore.getInstance().collection("chats");
     /** Get the last 50 chat messages ordered by timestamp . */
-    private static final Query sChatQuery = sChatCollection.orderBy("timestamp").limit(50);
+    private static final Query sChatQuery =
+            sChatCollection.orderBy("timestamp", Query.Direction.DESCENDING).limit(50);
 
     static {
         FirebaseFirestore.setLoggingEnabled(true);
@@ -70,8 +71,27 @@ protected void onCreate(@Nullable Bundle savedInstanceState) {
         setContentView(R.layout.activity_chat);
         ButterKnife.bind(this);
 
+        LinearLayoutManager manager = new LinearLayoutManager(this);
+        manager.setReverseLayout(true);
+        manager.setStackFromEnd(true);
+
         mRecyclerView.setHasFixedSize(true);
-        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
+        mRecyclerView.setLayoutManager(manager);
+
+        mRecyclerView.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
+            @Override
+            public void onLayoutChange(View view, int left, int top, int right, int bottom,
+                                       int oldLeft, int oldTop, int oldRight, int oldBottom) {
+                if (bottom < oldBottom) {
+                    mRecyclerView.postDelayed(new Runnable() {
+                        @Override
+                        public void run() {
+                            mRecyclerView.smoothScrollToPosition(0);
+                        }
+                    }, 100);
+                }
+            }
+        });
 
         ImeHelper.setImeOnDoneListener(mMessageEdit, new ImeHelper.DonePressedListener() {
             @Override
@@ -118,7 +138,7 @@ private void attachRecyclerViewAdapter() {
         adapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
             @Override
             public void onItemRangeInserted(int positionStart, int itemCount) {
-                mRecyclerView.smoothScrollToPosition(adapter.getItemCount());
+                mRecyclerView.smoothScrollToPosition(0);
             }
         });