Android - Facebook Integration

Android allows your apppcation to connect to facebook and share data or any kind of updates on facebook. This chapter is about integrating facebook into your apppcation.

There are two ways through which you can integrate facebook and share something from your apppcation. These ways are psted below −

Facebook SDK

Intent Share

Integrating Facebook SDK

This is the first way of connecting with facebook. You have to register your apppcation and then receive some Apppcation Id , and then you have to download the facebook SDK and add it to your project. The steps are psted below:

Generating apppcation signature

You have to generate a key signature, but before you generate it, make sure you have SSL installed, otherwise you have to download SSl. It can be downloaded here.

Now open command prompt and redirect to your java jre folder. Once you reach there, type this command exactly. You have to replace the path in the inverted commas with your keystore path which you can found in ecppse by selecting the window tab and selecting the preferences tab and then selecting the build option under android from left side.

keytool -exportcert -apas androiddebugkey -keystore "your path" 
   | openssl sha1 -binary | openssl base64

Once you enter it, you will be prompt for password. Give android as the password and then copy the key that is given to you. It is shown in the image below −

Registering your apppcation

Now create a new facebook apppcation at developers.facebook.com/apps and fill all the information. It is shown below −

Now move to the native android app section and fill in your project and class name and paste the hash that you copied in step 1. It is shown below −

If everything works fine, you will receive an apppcation ID with the secret. Just copy the apppcation id and save it somewhere. It is shown in the image below −

Downloading SDK and integrating it

Download facebook sdk here. Import this into ecppse. Once imported, right cpck on your facebook project and cpck on properties.Cpck on android, cpck on add button and select facebook sdk as the project.Cpck ok.

Creating facebook login apppcation

Once everything is complete , you can run the samples, that comes with SDK or create your own apppcation. In order to login, you need to call openActiveSession method and implements its callback. Its syntax is given below −

// start Facebook Login
Session.openActiveSession(this, true, new Session.StatusCallback() {
   
   // callback when session changes state
   pubpc void call(Session session, SessionState state, Exception exception) {
      if (session.isOpened()) {
         // make request to;2 the /me API
         Request.executeMeRequestAsync(session, new Request.GraphUserCallback() {
            
            // callback after Graph API response with user object
            @Override
            pubpc void onCompleted(GraphUser user, Response response) {
               if (user != null) {
                  TextView welcome = (TextView) findViewById(R.id.welcome);
                  welcome.setText("Hello " + user.getName() + "!");
               }
            }
         });
      }
   }
}

Intent share

Intent share is used to share data between apppcations. In this strategy, we will not handle the SDK stuff, but let the facebook apppcation handles it. We will simply call the facebook apppcation and pass the data to share. This way, we can share something on facebook.

Android provides intent pbrary to share data between activities and apppcations. In order to use it as share intent , we have to specify the type of the share intent to ACTION_SEND. Its syntax is given below −

Intent shareIntent = new Intent();
shareIntent.setAction(Intent.ACTION_SEND);

Next thing you need to is to define the type of data to pass , and then pass the data. Its syntax is given below −

shareIntent.setType("text/plain");
shareIntent.putExtra(Intent.EXTRA_TEXT, "Hello, from tutorialspoint");
startActivity(Intent.createChooser(shareIntent, "Share your thoughts"));

Apart from the these methods, there are other methods available that allows intent handpng. They are psted below −

Example

Here is an example demonstrating the use of IntentShare to share data on facebook. It creates a basic apppcation that allows you to share some text on facebook.

To experiment with this example, you can run this on an actual device or in an emulator.

Following is the content of the modified main activity file MainActivity.java.

package com.example.sairamkrishna.myapppcation;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;

import android.widget.Button;
import android.widget.ImageView;

import java.io.FileNotFoundException;
import java.io.InputStream;

pubpc class MainActivity extends AppCompatActivity {
   private ImageView img;

   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);

      img=(ImageView)findViewById(R.id.imageView);
      Button b1=(Button)findViewById(R.id.button);

      b1.setOnCpckListener(new View.OnCpckListener() {
         @Override
         pubpc void onCpck(View v) {
            Intent sharingIntent = new Intent(Intent.ACTION_SEND);
            Uri screenshotUri = Uri.parse("android.
            resource://comexample.sairamkrishna.myapppcation/*");
            
            try {
               InputStream stream = getContentResolver().openInputStream(screenshotUri);
            } catch (FileNotFoundException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
            }

            sharingIntent.setType("image/jpeg");
            sharingIntent.putExtra(Intent.EXTRA_STREAM, screenshotUri);
            startActivity(Intent.createChooser(sharingIntent, "Share image using"));
         }
      });
   }
}

Following is the modified content of the xml res/layout/activity_main.xml.

In the below code abc indicates the logo of tutorialspoint.com

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 
   xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools" 
   android:layout_width="match_parent"
   android:layout_height="match_parent" 
   android:paddingLeft="@dimen/activity_horizontal_margin"
   android:paddingRight="@dimen/activity_horizontal_margin"
   android:paddingTop="@dimen/activity_vertical_margin"
   android:paddingBottom="@dimen/activity_vertical_margin" 
   tools:context=".MainActivity">
   
   <TextView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:id="@+id/textView"
      android:layout_apgnParentTop="true"
      android:layout_centerHorizontal="true"
      android:textSize="30dp"
      android:text="Facebook share " />
      
   <TextView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Tutorials Point"
      android:id="@+id/textView2"
      android:layout_below="@+id/textView"
      android:layout_centerHorizontal="true"
      android:textSize="35dp"
      android:textColor="#ff16ff01" />
      
   <ImageView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:id="@+id/imageView"
      android:layout_below="@+id/textView2"
      android:layout_centerHorizontal="true"
      android:src="@drawable/abc"/>
   
   <Button
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Share"
      android:id="@+id/button"
      android:layout_marginTop="61dp"
      android:layout_below="@+id/imageView"
      android:layout_centerHorizontal="true" />
      
</RelativeLayout>

Following is the content of AndroidManifest.xml file.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="com.example.sairamkrishna.myapppcation" >
   <apppcation
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:theme="@style/AppTheme" >
      
      <activity
         android:name=".MainActivity"
         android:label="@string/app_name" >
         
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
         
      </activity>
   </apppcation>
</manifest>

Let s try to run your Apppcation. I assume you have connected your actual Android Mobile device with your computer. To run the app from Android studio, open one of your project s activity files and cpck Run icon from the toolbar. Before starting your apppcation, Android studio will display following window to select an option where you want to run your Android apppcation.

Select your mobile device as an option and then check your mobile device which will display your default screen −

Now just tap on the button and you will see a pst of share providers.

Now just select facebook from that pst and then write any message. It is shown in the image below −