Android FaceTime

Android FaceTime is an Android application that allows users to make real-time video and audio calls with other users who have the application installed on their device. This application is similar to Apple's FaceTime that is available exclusively on iOS devices.

Features

Android FaceTime allows users to:

• Make video and audio calls with other users in real-time
• Use front and back cameras during calls
• Send and receive text messages during calls
• Switch between audio and video mode during a call
• Use emojis and stickers during calls

Technology

Android FaceTime is built using various technologies such as:

• Firebase Realtime Database: for storing user data and messages
• WebRTC: for real-time communication between devices
• Android SDK: for building the application
• Google Play Services: for device compatibility and updates

Requirements

To use Android FaceTime, users must have:

• An Android device running Android 5.0 or later
• A stable internet connection
• The Android FaceTime application installed on their device
• A valid phone number to register and log in to the application

Code Snippets

Firebase Realtime Database

// Initialize Firebase
FirebaseDatabase firebaseDatabase = FirebaseDatabase.getInstance();

// Create reference to user data in database
DatabaseReference userDataRef = firebaseDatabase.getReference("userData");

WebRTC

// Enable camera and microphone
MediaDevices.getUserMedia({
	video: true,
	audio: true
});

// Set up peer connection
var pc = new RTCPeerConnection({
	iceServers: [{
		urls: "stun:stun.l.google.com:19302"
	}]
});

// Establish connection with remote peer
pc.setRemoteDescription(new RTCSessionDescription(remoteSdp))
	.then(() => pc.createAnswer())
	.then(answer => pc.setLocalDescription(answer))
	.then(() => {
		// Send answer to remote peer
	})
	.catch(error => console.log(error));

Android SDK

// Create new activity
public class MainActivity extends AppCompatActivity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}
}

// Get current device's phone number
TelephonyManager telephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
String phoneNumber = telephonyManager.getLine1Number();

Google Play Services

<!-- Declare Google Play Services dependency -->
<dependency>
	<groupId>com.google.android.gms</groupId>
	<artifactId>play-services</artifactId>
	<version>17.6.0</version>
</dependency>

<!-- Add Google Play Services API key to manifest -->
<meta-data android:name="com.google.android.geo.API_KEY"
		android:value="@string/google_maps_key" />