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HKUSTx: COMP107x Introduction to Mobile Application Development using Android
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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# 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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"display_name": "Python 2",
"language": "python",
"name": "python2"
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"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython2",
"version": "2.7.6"
}
},
"nbformat": 4,
"nbformat_minor": 0
}
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