Fixed a few populateView implementations

The position parameter is no longer optional, so update the docs to
always have it. Screenshots are not updated, so may still use the old
signature.

Author: puf

README.md

@@ -327,7 +327,7 @@ protected void onCreate(Bundle savedInstanceState) {
 
     mAdapter = new FirebaseListAdapter<ChatMessage>(this, ChatMessage.class, android.R.layout.two_line_list_item, ref) {
         @Override
-        protected void populateView(View view, ChatMessage chatMessage) {
+        protected void populateView(View view, ChatMessage chatMessage, int position) {
             ((TextView)view.findViewById(android.R.id.text1)).setText(chatMessage.getName());
             ((TextView)view.findViewById(android.R.id.text2)).setText(chatMessage.getMessage());
 
@@ -381,7 +381,7 @@ protected void onCreate(Bundle savedInstanceState) {
 
     mAdapter = new FirebaseListAdapter<ChatMessage>(this, ChatMessage.class, android.R.layout.two_line_list_item, ref) {
         @Override
-        protected void populateView(View view, ChatMessage chatMessage) {
+        protected void populateView(View view, ChatMessage chatMessage, int position) {
             ((TextView)view.findViewById(android.R.id.text1)).setText(chatMessage.getName());
             ((TextView)view.findViewById(android.R.id.text2)).setText(chatMessage.getMessage());
         }
@@ -449,7 +449,7 @@ recycler.setLayoutManager(new LinearLayoutManager(this));
 
 mAdapter = new FirebaseRecyclerViewAdapter<ChatMessage, ChatMessageViewHolder>(ChatMessage.class, android.R.layout.two_line_list_item, ChatMessageViewHolder.class, mRef) {
     @Override
-    public void populateViewHolder(ChatMessageViewHolder chatMessageViewHolder, ChatMessage chatMessage) {
+    public void populateViewHolder(ChatMessageViewHolder chatMessageViewHolder, ChatMessage chatMessage, int position) {
         chatMessageViewHolder.nameText.setText(chatMessage.getName());
         chatMessageViewHolder.messageText.setText(chatMessage.getMessage());
     }

codelabs/chat/README.md

@@ -282,14 +282,14 @@ Let's take this in chunks: first we'll create a Java class to represent each mes
         mListAdapter = new FirebaseListAdapter<ChatMessage>(this, ChatMessage.class,
                 android.R.layout.two_line_list_item, mFirebaseRef) {
             @Override
-            protected void populateView(View v, ChatMessage model) {
+            protected void populateView(View v, ChatMessage model, int position) {
                 ((TextView)v.findViewById(android.R.id.text1)).setText(model.getName());
                 ((TextView)v.findViewById(android.R.id.text2)).setText(model.getText());
             }
         };
         setListAdapter(mListAdapter);
 
-  The FirebaseListAdapter maps the data from your Firebase database into the ListView that you added to the layout. It creates a new instance of your `two_line_list_item` for each `ChatMessage` and calls the `populateView method`. We override this method and put the name and text in the correct subviews.
+  The FirebaseListAdapter maps the data from your Firebase database into the ListView that you added to the layout. It creates a new instance of your `two_line_list_item` for each `ChatMessage` and calls the `populateView` method. We override this method and put the name and text in the correct subviews.
 
   ![MainActivity code](images/5_6.png)