Integrating Twitter API in Android App

In this tutorial, we will integrate the Twitter Log-in API into an Android app. For integrating Twitter API in the Android app, it requires the app Consumer Key (API Key) and Consumer Secret (API Secret). It can be generated from https://apps.twitter.com/.

Combining the Twitter API in Android app helps users for log-in using the Twitter account, share tweets, etc.

Steps to generate Twitter API Key and API Secret

1. Log-in at https://apps.twitter.com/ with your Twitter account and click on 'Create New App'.

2. Fill all the required detail in new open form and click on 'Create your Twitter Application'.

3. Select the application permission mode for our app. Here we select Read, Write and Access direct messages and click 'Update Settings'.

4. Now, open the 'Settings' tab and fill all the required details and click 'Update Settings'.

5. Now again, open Permissions tab and enable 'Request email from users' and click again 'Update settings'.

6. Now, open 'Key and Access Tokens' tab, we will find our app 'Consumer Key' and 'Consumer Secrets'.

Example to Integrate Twitter Login in Android app

Let's create an example of integrating login through a Twitter account in an Android app.

Create an Android app and add the following twitter dependencies in 'build.gradel' (Module) file.

compile 'com.twitter.sdk.android:twitter:3.1.1'
compile 'com.twitter.sdk.android:twitter-core:3.1.1'

Make sure that "jcenter()" is present in 'build.gradel' (Project) file.

strings.xml

Place the 'Consumer Key' and 'Consumer Secret' of our app generated by Twitter in 'strings.xml' file.

<resources>
    <string name="app_name">Twitter Login Demo</string>
    <string name="com.twitter.sdk.android.CONSUMER_KEY">Fw4cXXXXXXXXXXX</string>
    <string name="com.twitter.sdk.android.CONSUMER_SECRET">Pnr7XXXXXXXXXXX</string>
</resources>

activity_main.xml

Add the Twitter login button provided by Twitter API in 'activity_main.xml' file.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="example.com.twitterlogindemo.MainActivity">


    <com.twitter.sdk.android.core.identity.TwitterLoginButton
        android:id="@+id/login_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
       android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="40dp"/>

</RelativeLayout>

MainActivity.java

Add the following code in 'MainActivity.java' file. We should place 'Twitter.initialize(this)' code before 'setContentView(R.layout.activity_main)'. If we place 'Twitter.initialize(this)' after the 'setContentView(R.layout.activity_main)' then our Twitter button will disable.

package example.com.twitterlogindemo;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;

import com.twitter.sdk.android.core.Callback;
import com.twitter.sdk.android.core.Result;
import com.twitter.sdk.android.core.Twitter;
import com.twitter.sdk.android.core.TwitterAuthToken;
import com.twitter.sdk.android.core.TwitterCore;
import com.twitter.sdk.android.core.TwitterException;
import com.twitter.sdk.android.core.TwitterSession;
import com.twitter.sdk.android.core.identity.TwitterLoginButton;

public class MainActivity extends AppCompatActivity {

    TwitterLoginButton loginButton;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Twitter.initialize(this);
        setContentView(R.layout.activity_main);

        loginButton = (TwitterLoginButton) findViewById(R.id.login_button);
        loginButton.setCallback(new Callback<TwitterSession>() {
            @Override
            public void success(Result<TwitterSession> result) {
                // Do something with result, which provides a TwitterSession for making API calls
                TwitterSession session = TwitterCore.getInstance().getSessionManager().getActiveSession();
                TwitterAuthToken authToken = session.getAuthToken();
                //String token = authToken.token;
              //  String secret = authToken.secret;

                loginMethod(session);
            }

            @Override
            public void failure(TwitterException exception) {
                // Do something on failure
                Toast.makeText(getApplicationContext(),"Login fail",Toast.LENGTH_LONG).show();
            }
        });
    }

    public void loginMethod(TwitterSession twitterSession){
            String userName=twitterSession.getUserName();
            Intent intent= new Intent(MainActivity.this,HomeActivity.class);
            intent.putExtra("username",userName);
            startActivity(intent);
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        // Pass the activity result to the login button.
        loginButton.onActivityResult(requestCode, resultCode, data);
    }
}

Now we create another Activity for redirecting user after successful login.

activity_home.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="example.com.twitterlogindemo.HomeActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Welcome to HomePage"
        android:textSize="20dp"
        android:layout_centerHorizontal="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="40dp"

       />

    <TextView
        android:id="@+id/nametextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView"
        android:layout_alignStart="@+id/textView"
        android:layout_below="@+id/textView"
        android:layout_marginTop="48dp"
        android:textSize="16dp"
        android:text="" />
</RelativeLayout>

HomeActivity.java

In this class, we will display the user name received from 'MainActivity.java' file in TextView.

package example.com.twitterlogindemo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

public class HomeActivity extends AppCompatActivity {
    TextView name;
    String user;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);

        user=getIntent().getStringExtra("username");
        name=(TextView)findViewById(R.id.nametextView);
        name.setText(user);

    }
}

Output: