hướng dẫn xây dựng ứng dụng facebook

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ANDROID FACEBOOK CONNECT TUTORIAL
Source code : AndroidFacebookConnect.zip
Generating App Signature for Facebook Settings
To create facebook android native app you need to provide your Android application signature in
facebook app settings. You can generate your application signature (keyhash) usingkeytool that
comes with java. But to generate signature you need openssl installed on your pc. If you don’t have
one download openssl from here and set it in your system environment path.
Open your command prompt (CMD) and run the following command to generate your keyhash.
While generating hashkey it should ask you password. Give password as android. If it don’t ask for
password your keystore path is incorrect.
keytool -exportcert -alias androiddebugkey -keystore "<path-to-users
directory>\.android\debug.keystore" | openssl sha1 -binary | openssl base64
check the following command how i generated hashkey on my pc.
keytool -exportcert -alias androiddebugkey -keystore
"C:\Users\Ravi\.android\debug.keystore" | openssl sha1 -binary | openssl
base64

Registering your Facebook Application
After generating your app signature successfully, register your facebook application by going
to create new facebook application and fill out all the information needed. And select Native
Android App and give your hashkey there which you generated previously using keytool.
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and note down your facebook App ID

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Creating Facebook Reference Project
Once you are done with registering your facebook application, you need to download facebook SDK
and create a new reference project. This reference project will be used to compile your actual
project.
1. Download facebook android SDK from git repositories.
(git clone git://github.com/facebook/facebook-android-sdk.git)
2. In your Eclipse goto File ⇒ Import ⇒ Existing Projects into Workspace and select the facebook
project you downloaded from git repository.
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Creating Your Facebook Connect Project
1. Create new Project in your Eclipse IDE. File ⇒ New ⇒ Android Project and fill out all the details.
2. Now we need to add reference of this project to existing facebook project. Right Click on Project
⇒ Properties ⇒ android ⇒ Click on Add button ⇒ select your facebook project ⇒ Click Apply.
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Now our project setup is done. We can start coding our facebook application.
3. Open your AndroidManifest.xml file add network connect permission in order to connect to
internet.
<uses-permission android:name="android.permission.INTERNET"/>

AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="
package="com.facebook.androidhive"
android:versionCode="1"
android:versionName="1.0" >

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<uses-sdk android:minSdkVersion="8" />

<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity

android:label="@string/app_name"
android:name=".AndroidFacebookConnectActivity" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<! Connect to Internet Permissions >
<uses-permission android:name="android.permission.INTERNET"/>

</manifest>
4. Open Your Main Activity Class and initialize all the variables needed.
public class AndroidFacebookConnectActivity extends Activity {

// Your Facebook APP ID
private static String APP_ID = "308180782571605"; // Replace your App ID
here

// Instance of Facebook Class
private Facebook facebook;
private AsyncFacebookRunner mAsyncRunner;
String FILENAME = "AndroidSSO_data";
private SharedPreferences mPrefs;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

facebook = new Facebook(APP_ID);
mAsyncRunner = new AsyncFacebookRunner(facebook);
5. I created a simple interface which contains button to login, post to wall, show access tokens and
logout for testing purpose.
Login to Facebook Account
I used a button to login into facebook account. In your activity write a click event for Login button
click. Inside click event declare a function named loginToFacebook();
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Login button click event
btnFbLogin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
loginToFacebook();
}
});
and function body for loginToFacebook() function is:
public void loginToFacebook() {
mPrefs = getPreferences(MODE_PRIVATE);
String access_token = mPrefs.getString("access_token", null);
long expires = mPrefs.getLong("access_expires", 0);

if (access_token != null) {
facebook.setAccessToken(access_token);
}

if (expires != 0) {
facebook.setAccessExpires(expires);
}

if (!facebook.isSessionValid()) {
facebook.authorize(this,
new String[] { "email", "publish_stream" },
new DialogListener() {

@Override
public void onCancel() {
// Function to handle cancel event
}

@Override
public void onComplete(Bundle values) {
// Function to handle complete event
// Edit Preferences and update facebook acess_token
SharedPreferences.Editor editor = mPrefs.edit();
editor.putString("access_token",
facebook.getAccessToken());
editor.putLong("access_expires",
facebook.getAccessExpires());
editor.commit();
}

@Override
public void onError(DialogError error) {
// Function to handle error

}

@Override

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public void onFacebookError(FacebookError fberror) {
// Function to handle Facebook errors

}

});
}
}
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Posting Message to Facebook Wall
write a click event for post to wall button and inside click event write a function namedpostToWall()
btnPostToWall.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
postToWall();
}
});
and function body for postToWall() function is:
public void postToWall() {

// post on user's wall.
facebook.dialog(this, "feed", new DialogListener() {

@Override
public void onFacebookError(FacebookError e) {
}

@Override
public void onError(DialogError e) {
}

@Override
public void onComplete(Bundle values) {
}

@Override
public void onCancel() {
}
});

}
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Getting Profile Information from Facebook
To get profile information we need to make an api request to facebook graph API. Following is a
function that will make an api request to facebook profile graph api and will get profile information
from facebook.
getProfileInformation()


public void getProfileInformation() {
mAsyncRunner.request("me", new RequestListener() {
@Override
public void onComplete(String response, Object state) {
Log.d("Profile", response);
String json = response;
try {
JSONObject profile = new JSONObject(json);
// getting name of the user
String name = profile.getString("name");
// getting email of the user
String email = profile.getString("email");

runOnUiThread(new Runnable() {

@Override
public void run() {
Toast.makeText(getApplicationContext(), "Name: " +
name + "\nEmail: " + email, Toast.LENGTH_LONG).show();
}

});

} catch (JSONException e) {
e.printStackTrace();
}
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}

@Override
public void onIOException(IOException e, Object state) {
}

@Override
public void onFileNotFoundException(FileNotFoundException e,
Object state) {
}

@Override
public void onMalformedURLException(MalformedURLException e,
Object state) {
}

@Override
public void onFacebookError(FacebookError e, Object state) {
}
});
}
The above function will get json data from facebook. You need to parse the json in order to get

individual profile data. If you are not aware of json parsing look at this article. Android JSON Parsing
Tutorial.
The sample profile json from facebook will be like this
{
"id": "1464730016",
"name": "Ravi Tamada",
"first_name": "Ravi",
"last_name": "Tamada",
"link": "
"username": "ravi8x",
"birthday": "12/22/1988",
"hometown": {
"id": "112158005464147",
"name": "Baruva"
},
"location": {
"id": "102186159822587",
"name": "Chennai, Tamil Nadu"
},
"bio": "Author: www.androidhive.info\r\nCo-author: www.9lessons.info",
"work": [
{
"employer": {
"id": "179366562092719",
"name": "ByteAlly"
},
"location": {
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"id": "102186159822587",
"name": "Chennai, Tamil Nadu"
},
"position": {
"id": "124917314217511",
"name": "Product Head"
}
]
}
],
"favorite_athletes": [
{
"id": "18620649907",
"name": "Virat Kohli"
}
],
"education": [
{
"school": {
"id": "131587206873093",
"name": "Raghu Engineering College (REC)"
},
"degree": {
"id": "140065339390579",
"name": "B.Tech"
},
"year": {
"id": "142963519060927",
"name": "2010"
},

"type": "Graduate School",
"classes": [
{
"id": "192259410803415",
"name": "2010",
"with": [
{
"id": "584960408",
"name": "Santosh Patnaik"
}
],
"from": {
"id": "584960408",
"name": "Santosh Patnaik"
}
}
]
}
],
"gender": "male",
"relationship_status": "Single",
"website":
"www.androidhive.info\nwww.9lessons.info\nwww.twitter.com/ravitamada\nwww.abo
ut.me/rv",
"timezone": 5.5,
"locale": "en_US",
"languages": [
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{
"id": "106059522759137",
"name": "English"
},
{
"id": "107617475934611",
"name": "Telugu"
},
{
"id": "112969428713061",
"name": "Hindi"
},
{
"id": "343306413260",
"name": "Tamil"
}
],
"verified": true,
"updated_time": "2012-03-02T17:04:18+0000"
}
Extending facebook Permissions
If you want user’s other information like checkins, friends list etc., you need to extend facebook
permissions while logging in user. Check list of facebook permissions
facebook.authorize(this, new String[] { "email", "publish_checkins",
"publish_stream" },

new DialogListener() {
@Override
public void onComplete(Bundle values) {}

@Override
public void onFacebookError(FacebookError error) {}

@Override
public void onError(DialogError e) {}

@Override
public void onCancel() {}
}
);
Getting Access Token
Sometimes you might needed users access token for future purpose usage. Following code will give
you currently logged in user access token.
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String access_token = facebook.getAccessToken();
Logout from your app
When user want to stop using facebook for your app, you can provide logout method to clear app
state and invalidate access token. So further you can’t make request to facebook from your app.
logoutFromFacebook();

public void logoutFromFacebook() {
mAsyncRunner.logout(this, new RequestListener() {
@Override
public void onComplete(String response, Object state) {
Log.d("Logout from Facebook", response);
if (Boolean.parseBoolean(response) == true) {
// User successfully Logged out

}
}

@Override
public void onIOException(IOException e, Object state) {
}

@Override
public void onFileNotFoundException(FileNotFoundException e,
Object state) {
}

@Override
public void onMalformedURLException(MalformedURLException e,
Object state) {
}

@Override
public void onFacebookError(FacebookError e, Object state) {
}
});
}