实现实时视频聊天功能的源码在Android平台上可以使用WebRTC技术。下面是一个简单的示例：
1. 添加依赖项
在项目的build.gradle文件中添加以下依赖项：
```groovy
dependencies {
implementation 'org.webrtc:google-webrtc:1.0.32006'
}
```
2. 创建RTC连接
```java
PeerConnectionFactory.initialize(PeerConnectionFactory.InitializationOptions.builder(context).createInitializationOptions());
PeerConnectionFactory factory = new PeerConnectionFactory();
// 创建本地视频源
VideoCapturer videoCapturer = createVideoCapturer();
VideoSource videoSource = factory.createVideoSource(videoCapturer.isScreencast());
LocalVideoTrack localVideoTrack = factory.createVideoTrack("video_track", videoSource);
// 创建本地音频源
AudioSource audioSource = factory.createAudioSource(new MediaConstraints());
LocalAudioTrack localAudioTrack = factory.createAudioTrack("audio_track", audioSource);
// 创建本地媒体流
MediaStream localStream = factory.createLocalMediaStream("local_stream");
localStream.addTrack(localVideoTrack);
localStream.addTrack(localAudioTrack);
// 创建PeerConnection
PeerConnection.RTCConfiguration rtcConfig = new PeerConnection.RTCConfiguration(Collections.singletonList(new PeerConnection.IceServer("stun:stun.l.google.com:19302")));
PeerConnection.Observer pcObserver = new PeerConnection.Observer() {
// 实现对方视频流的回调
@Override
public void onAddStream(MediaStream mediaStream) {
// 获取对方的视频轨道
VideoTrack remoteVideoTrack = mediaStream.videoTracks.getFirst();
// 显示对方的视频
remoteVideoTrack.addSink(remoteVideoView);
}
// 其他回调方法...
};
PeerConnection peerConnection = factory.createPeerConnection(rtcConfig, pcObserver);
peerConnection.addStream(localStream);
```
3. 发起视频通话
```java
// 创建SessionDescription
SdpObserver sdpObserver = new SdpObserver() {
@Override
public void onCreateSuccess(SessionDescription sessionDescription) {
// 设置本地的SessionDescription
peerConnection.setLocalDescription(sdpObserver, sessionDescription);
// 发送本地的SessionDescription到对方
sendSessionDescription(sessionDescription);
}
// 其他回调方法...
};
peerConnection.createOffer(sdpObserver, new MediaConstraints());
```
4. 接收视频通话
```java
// 接收对方的SessionDescription
SessionDescription remoteDescription = receiveSessionDescription();
peerConnection.setRemoteDescription(sdpObserver, remoteDescription);
// 创建Answer
peerConnection.createAnswer(sdpObserver, new MediaConstraints());
```
5. 建立视频连接
```java
// 设置对方的SessionDescription
peerConnection.setRemoteDescription(sdpObserver, remoteDescription);
// 添加ICE候选
peerConnection.addIceCandidate(candidate);
// 建立连接
peerConnection.createAnswer(sdpObserver, new MediaConstraints());
```
这只是一个简单的示例，实际的视频聊天功能需要处理更多的细节，例如处理ICE候选、处理连接状态变化、处理媒体流的传输等。完整的实现可能需要更多的代码和逻辑。
