（5）CameraTest.java 程序主体。设置PreviewCallback后，每当一帧图像数据采集完成后将调用PreviewCallback的onPreviewFrame函数。在这里我们将YUV格式数据转为jpg，再启用线程将数据通过socket发送出去。
?public class CameraTest extends Activity {
SurfaceView sView;
SurfaceHolder surfaceHolder;
int screenWidth, screenHeight;
Camera camera; // 定义系统所用的照相机
boolean isPreview = false; //是否在浏览中
private String ipname;
@SuppressWarnings("deprecation")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 设置全屏
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.main);
// 获取IP地址
Intent intent = getIntent();
Bundle data = intent.getExtras();
ipname = data.getString("ipname");
screenWidth = 640;
screenHeight = 480;
sView = (SurfaceView) findViewById(R.id.sView); // 获取界面中SurfaceView组件
surfaceHolder = sView.getHolder(); // 获得SurfaceView的SurfaceHolder
// 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();
}
}
}
二、PC服务器端
ImageServer.java 用于显示图像，并且可以拍照