// 为surfaceHolder添加一个回调监听器
surfaceHolder.addCallback(new Callback() {
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}

@Override
public void surfaceCreated(SurfaceHolder holder) {
initCamera(); // 打开摄像头
}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// 如果camera不为null ,释放摄像头
if (camera != null) {
if (isPreview)
camera.stopPreview();
camera.release();
camera = null;
}
System.exit(0);
}
});
// 设置该SurfaceView自己不维护缓冲
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

}

private void initCamera() {
if (!isPreview) {
camera = Camera.open();
}
if (camera != null && !isPreview) {
try {
Camera.Parameters parameters = camera.getParameters();
parameters.setPreviewSize(screenWidth, screenHeight); // 设置预览照片的大小
parameters.setPreviewFpsRange(20, 30); // 每秒显示20~30帧
parameters.setPictureFormat(ImageFormat.NV21); // 设置图片格式
parameters.setPictureSize(screenWidth, screenHeight); // 设置照片的大小
// camera.setParameters(parameters); // android2.3.3以后不需要此行代码
camera.setPreviewDisplay(surfaceHolder); // 通过SurfaceView显示取景画面
camera.setPreviewCallback(new StreamIt(ipname)); // 设置回调的类
camera.startPreview(); // 开始预览
camera.autoFocus(null); // 自动对焦
} catch (Exception e) {
e.printStackTrace();
}
isPreview = true;
}
}

}

class StreamIt implements Camera.PreviewCallback {
private String ipname;

public StreamIt(String ipname) {
this.ipname = ipname;
}

@Override
public void onPreviewFrame(byte[] data, Camera camera) {
Size size = camera.getParameters().getPreviewSize();
try {
// 调用image.compressToJpeg（）将YUV格式图像数据data转为jpg格式
YuvImage image = new YuvImage(data, ImageFormat.NV21, size.width, size.height, null);
if (image != null) {
ByteArrayOutputStream outstream = new ByteArrayOutputStream();
image.compressToJpeg(new Rect(0, 0, size.width, size.height), 80, outstream);
outstream.flush();
// 启用线程将图像数据发送出去
Thread th = new MyThread(outstream, ipname);
th.start();
}
} catch (Exception ex) {
Log.e("Sys", "Error:" + ex.getMessage());
}
}
}

class MyThread extends Thread {
private byte byteBuffer[] = new byte[1024];
private OutputStream outsocket;
private ByteArrayOutputStream myoutputstream;
private String ipname;

public MyThread(ByteArrayOutputStream myoutputstream, String ipname) {
this.myoutputstream = myoutputstream;
this.ipname = ipname;
try {
myoutputstream.close();
} catch (IOException e) {
e.printStackTrace();
}
}

public void run() {
try {
// 将图像数据通过Socket发送出去
Socket tempSocket = new Socket(ipname, 6000);
outsocket = tempSocket.getOutputStream();
ByteArrayInputStream inputstream = new ByteArrayInputStream(myoutputstream.toByteArray());
int amount;
while ((amount = inputstream.read(byteBuffer)) != -1) {
outsocket.write(byteBuffer, 0, amount);
}
myoutputstream.flush();
myoutputstream.close();
tempSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}

}

这样就打开了socket，然后把camera获取的数据发送到PC端。