diff --git a/app/src/main/java/org/communiquons/android/comunic/client/data/comments/CommentsHelper.java b/app/src/main/java/org/communiquons/android/comunic/client/data/comments/CommentsHelper.java
index 95998ad..44a581a 100644
--- a/app/src/main/java/org/communiquons/android/comunic/client/data/comments/CommentsHelper.java
+++ b/app/src/main/java/org/communiquons/android/comunic/client/data/comments/CommentsHelper.java
@@ -1,8 +1,12 @@
 package org.communiquons.android.comunic.client.data.comments;
 
+import android.content.Context;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 
+import org.communiquons.android.comunic.client.api.APIRequest;
+import org.communiquons.android.comunic.client.api.APIRequestParameters;
+import org.communiquons.android.comunic.client.api.APIResponse;
 import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
@@ -18,6 +22,86 @@ import java.util.ArrayList;
 
 public class CommentsHelper {
 
+    /**
+     * Application context
+     */
+    private Context mContext;
+
+    /**
+     * Comments helper public constructor
+     *
+     * @param context The context of the application
+     */
+    public CommentsHelper(Context context){
+
+        //Save application context (avoid to leak activities context)
+        mContext = context.getApplicationContext();
+
+    }
+
+
+    /**
+     * Intend to submit a new comment to a post
+     *
+     * @param postID The target post
+     * @param comment The content of the comment
+     * @return The ID of the created comment / -1 in case of failure
+     */
+    public int send_comment(int postID, String comment){
+
+        //Create and perform an API request
+        APIRequestParameters params = new APIRequestParameters(mContext, "comments/create");
+        params.addInt("postID", postID);
+        params.addString("content", comment);
+
+        //Perform the request
+        try {
+
+            //Try to perform the request
+            APIResponse response = new APIRequest().exec(params);
+
+            //Check and return success
+            return response.getJSONObject().getInt("commentID");
+
+        } catch (Exception e) {
+            e.printStackTrace();
+            return -1;
+        }
+    }
+
+    /**
+     * Get informations about a single comment
+     *
+     * @param commentID The ID of the comment to get
+     * @return Informations about the comment or NULL in case of failure
+     */
+    @Nullable
+    public Comment getInfosSingle(int commentID){
+
+        //Prepare API request
+        APIRequestParameters params = new APIRequestParameters(mContext, "comments/get_single");
+        params.addInt("commentID", commentID);
+
+        //Perform the request
+        try {
+
+            //Perform the request
+            APIResponse response = new APIRequest().exec(params);
+
+            //Process result (if any)
+            if(response.getResponse_code() != 200)
+                return null;
+
+            //Parse and return response
+            return parse_json_comment(response.getJSONObject());
+
+        } catch (Exception e) {
+            e.printStackTrace();
+            return null;
+        }
+
+    }
+
     /**
      * Parse a json array that contains comment and return the list of comments as an object
      *
diff --git a/app/src/main/java/org/communiquons/android/comunic/client/ui/adapters/PostsAdapter.java b/app/src/main/java/org/communiquons/android/comunic/client/ui/adapters/PostsAdapter.java
index f73b570..e4075ce 100644
--- a/app/src/main/java/org/communiquons/android/comunic/client/ui/adapters/PostsAdapter.java
+++ b/app/src/main/java/org/communiquons/android/comunic/client/ui/adapters/PostsAdapter.java
@@ -12,6 +12,7 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ArrayAdapter;
 import android.widget.EditText;
+import android.widget.ImageButton;
 import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.RelativeLayout;
@@ -19,9 +20,13 @@ import android.widget.TextView;
 import android.widget.Toast;
 
 import org.communiquons.android.comunic.client.R;
+import org.communiquons.android.comunic.client.data.DatabaseHelper;
 import org.communiquons.android.comunic.client.data.ImageLoad.ImageLoadManager;
+import org.communiquons.android.comunic.client.data.UsersInfo.GetUsersHelper;
+import org.communiquons.android.comunic.client.data.UsersInfo.GetUsersInfos;
 import org.communiquons.android.comunic.client.data.UsersInfo.UserInfo;
 import org.communiquons.android.comunic.client.data.comments.Comment;
+import org.communiquons.android.comunic.client.data.comments.CommentsHelper;
 import org.communiquons.android.comunic.client.data.posts.Post;
 import org.communiquons.android.comunic.client.data.posts.PostTypes;
 import org.communiquons.android.comunic.client.data.posts.PostsList;
@@ -56,6 +61,16 @@ public class PostsAdapter extends ArrayAdapter<Post>{
      */
     private Utilities utils;
 
+    /**
+     * Comments helper
+     */
+    private CommentsHelper mCommentsHelper;
+
+    /**
+     * Get user helper
+     */
+    private GetUsersHelper mUserHelper;
+
     /**
      * Create the Post Adapter
      *
@@ -71,6 +86,12 @@ public class PostsAdapter extends ArrayAdapter<Post>{
 
         //Create utilities object
         utils = new Utilities(getContext());
+
+        //Create get user helper object
+        mUserHelper = new GetUsersHelper(getContext(), DatabaseHelper.getInstance(getContext()));
+
+        //Create comments helper object
+        mCommentsHelper = new CommentsHelper(context);
     }
 
     @NonNull
@@ -221,13 +242,17 @@ public class PostsAdapter extends ArrayAdapter<Post>{
     private void sendComment(int pos, View container){
 
         //Get post informations
-        Post post = getItem(pos);
+        final Post post = getItem(pos);
         if(post==null)
             return;
 
+        //Get view about the comment
+        final EditCommentContentView commentInput = container.findViewById(R.id.input_comment_content);
+        final ImageButton sendButton = container.findViewById(R.id.comment_send_button);
+
         //Get informations about the comment
-        int postID = post.getId();
-        String content = ((EditText) container.findViewById(R.id.input_comment_content)).getText()+"";
+        final int postID = post.getId();
+        final String content = commentInput.getText()+"";
 
         //Check the comment's validity
         if(!StringsUtils.isValidForContent(content)){
@@ -236,6 +261,9 @@ public class PostsAdapter extends ArrayAdapter<Post>{
             return;
         }
 
+        //Lock send button
+        sendButton.setClickable(false);
+
         //Submit the comment in a separate thread
         new AsyncTask<Void, Void, Pair<UserInfo, Comment>>(){
 
@@ -244,11 +272,57 @@ public class PostsAdapter extends ArrayAdapter<Post>{
             protected Pair<UserInfo, Comment> doInBackground(Void... params) {
 
                 //Try to create the comment
+                int commentID = mCommentsHelper.send_comment(postID, content);
 
+                //Check for errors
+                if(commentID < 1)
+                    return null;
 
-                return null;
+                //Get information about the newly created comment
+                Comment comment = mCommentsHelper.getInfosSingle(commentID);
+
+                //Check for errors
+                if(comment == null)
+                    return null;
+
+                //Get informations about the related user
+                UserInfo user = mUserHelper.getSingle(comment.getUserID(), false);
+
+                //Check for errors
+                if(user == null)
+                    return null;
+
+                //Return result
+                return Pair.create(user, comment);
             }
 
+            @Override
+            protected void onPostExecute(@Nullable Pair<UserInfo, Comment> userInfoCommentPair) {
+
+                //Unlock send button
+                sendButton.setClickable(true);
+
+                //Check for errors
+                if(userInfoCommentPair == null){
+                    Toast.makeText(getContext(), R.string.err_create_comment,
+                            Toast.LENGTH_SHORT).show();
+                    return;
+                }
+
+                //Empty comment input
+                commentInput.setText("");
+
+                //Add the comment to the list
+                ArrayList<Comment> comments = post.getComments_list();
+                assert comments != null;
+                comments.add(userInfoCommentPair.second);
+
+                //Add the user to the list
+                mUsersInfos.put(userInfoCommentPair.first.getId(), userInfoCommentPair.first);
+
+                //Update data set
+                notifyDataSetChanged();
+            }
         }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
     }
 }
diff --git a/app/src/main/res/layout/post_item.xml b/app/src/main/res/layout/post_item.xml
index b0a4b55..fbf1261 100644
--- a/app/src/main/res/layout/post_item.xml
+++ b/app/src/main/res/layout/post_item.xml
@@ -1,29 +1,29 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
-    android:orientation="vertical"
+    style="@style/PostContener"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    style="@style/PostContener">
+    android:orientation="vertical">
 
     <!-- Informations about user who created the post -->
     <LinearLayout
+        style="@style/PostHeader"
         android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        style="@style/PostHeader">
+        android:layout_height="wrap_content">
 
         <ImageView
             android:id="@+id/user_account_image"
-            android:src="@drawable/default_account_image"
-            android:contentDescription="@string/user_image_description"
             android:layout_width="@dimen/account_image_default_width"
-            android:layout_height="@dimen/account_image_default_height" />
+            android:layout_height="@dimen/account_image_default_height"
+            android:contentDescription="@string/user_image_description"
+            android:src="@drawable/default_account_image" />
 
         <LinearLayout
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            android:orientation="vertical"
-            android:layout_gravity="center">
+            android:layout_gravity="center"
+            android:orientation="vertical">
 
             <!-- User name -->
             <TextView
@@ -40,7 +40,7 @@
                 style="@style/PostDate"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
-                tools:text="15 days ago"/>
+                tools:text="15 days ago" />
 
         </LinearLayout>
 
@@ -48,15 +48,15 @@
         <View
             android:layout_width="0dp"
             android:layout_height="0dp"
-            android:layout_weight="1"/>
+            android:layout_weight="1" />
 
         <!-- Post visibility level -->
         <TextView
             android:id="@+id/post_visibility"
+            style="@style/PostVisibility"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            tools:text="Public"
-            style="@style/PostVisibility"/>
+            tools:text="Public" />
 
 
     </LinearLayout>
@@ -66,23 +66,48 @@
         android:id="@+id/post_image"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:scaleType="fitCenter"
-        android:contentDescription="@string/post_image_description"/>
+        android:contentDescription="@string/post_image_description"
+        android:scaleType="fitCenter" />
 
     <!-- Post content -->
     <TextView
         android:id="@+id/post_content"
+        style="@style/PostContent"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        tools:text="Post content"
-        style="@style/PostContent" />
+        tools:text="Post content" />
 
     <!-- Post comments -->
     <LinearLayout
-        android:orientation="vertical"
         android:id="@+id/comments_list"
         android:layout_width="match_parent"
-        android:layout_height="wrap_content" />
+        android:layout_height="wrap_content"
+        android:orientation="vertical" />
+
+    <!-- Comments form -->
+    <LinearLayout
+        android:id="@+id/create_comment_form"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal">
+
+        <!-- Comment hint -->
+        <org.communiquons.android.comunic.client.ui.views.EditCommentContentView
+            android:id="@+id/input_comment_content"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:hint="@string/new_comment_hint"
+            android:inputType="textMultiLine" />
+
+        <ImageButton
+            android:id="@+id/comment_send_button"
+            android:layout_width="wrap_content"
+            android:layout_height="match_parent"
+            android:contentDescription="@string/action_send"
+            android:src="@android:drawable/ic_menu_send" />
+
+    </LinearLayout>
 
 
 </LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values-fr/strings.xml b/app/src/main/res/values-fr/strings.xml
index 6a5dd69..7405669 100644
--- a/app/src/main/res/values-fr/strings.xml
+++ b/app/src/main/res/values-fr/strings.xml
@@ -93,4 +93,5 @@
     <string name="fragment_update_conversation_title_update">Modification de conversation</string>
     <string name="fragment_update_conversation_members_menu_delete">Supprimer</string>
     <string name="fragment_update_conversation_button_update">Mettre à jour</string>
+    <string name="err_invalid_comment_content">Le commentaire saisi semble être invalide…</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index d9b10da..48fd616 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -101,4 +101,8 @@
     <string name="post_visibility_friends">friends</string>
     <string name="post_visibility_private">private</string>
     <string name="post_image_description">Post image (if any)</string>
+    <string name="new_comment_hint">New comment</string>
+    <string name="err_invalid_comment_content">Specified comment content seems to be invalid…</string>
+    <string name="err_create_comment">An error occurred while trying to create comment!</string>
+    <string name="action_send">Send</string>
 </resources>