HKUSTx: COMP107x Introduction to Mobile Application Development using Android

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    "# Exercise: Handling JSON in Android\n",
    "---\n",
    "## Objectives\n",
    "\n",
    "In this exercise you will learn about processing a JSON string, and the use of Gson library. At the end of this exercise you will be able to:\n",
    "\n",
    "* Learn to process a JSON string and map it into Java objects\n",
    "* Use the Google Gson library to process a JSON string into Java objects\n",
    "\n",
    "## Introduction\n",
    "\n",
    "This project is the first step in understanding how a client-server communication can be implemented in an Android app. We will learn to process a JSON string and map it into a list of Java objects to be used for constructing list items for a ListView.\n",
    "\n",
    "## Textual Instructions\n",
    "---\n",
    "### Step 1: Examining the Project Files\n",
    "\n",
    "1. Download the [ChatClientJson.zip](http://w02.hkvu.hk/edX/COMP107x/w5/ChatClientJson.zip) file, unzip it and import the project into Android Studio.\n",
    "2. Open the **friend_item.xml** file.\n",
    "3. Open the **Contacts.java** file and the **MyArrayAdapter.java** file.\n",
    "4. Follow the video instructions.\n",
    "\n",
    "---\n",
    "### Step 2: Updating the Contacts Activity\n",
    "\n",
    "1. Open the Contacts.java file and navigate to the processFriendInfo() method.\n",
    "2. Replace the first // TODO comment with the following code.\n",
    "        GsonBuilder gsonBuilder = new GsonBuilder();\n",
    "        Gson gson = gsonBuilder.create();\n",
    "3. Replace the second // TODO comment with the following code.\n",
    "        friendInfoList = new ArrayList<FriendInfo>();\n",
    "        friendInfoList = Arrays.asList(gson.fromJson(infoString, FriendInfo[].class));\n",
    "\n",
    "4. Run the app and see the result."
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