1、基于 android 的远程视频监控系统（已开放源码） 基本过程是 android 作为 socket 客户端将采集到的每一帧图像数据发送出去，PC 作为服务 器接收并显示每一帧图像实现远程监控。图片如下（后来 PC 端加了个拍照功能）。 （PS 。刚学 android 和 java 不久很多东西还不懂，高手若是知道哪些地方可以继续优化的话 还请多多指点下啊） 系统代码如下： 一、android 手机客户端 （1）AndroidManifest.xml 文件。添加 camera 和 socket 权限，并设置了程序开始执行的 activity、 ? （2）main.xml 设置 surface
2、view 用于摄像头采集图像的预览 ? （3）login.xml 登录界面，用于输入服务器 IP ? （4）GetIP.java 获得服务器 IP 后，通过 Intent 启动 CameraTest 的 activity，ip 信 息通过 Bundle 传递 ? public class GetIP extends Activity String ipname = null; Override public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); / 设置全屏 requestWin
3、dowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FUL LSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.main); final Builder builder = new AlertDialog.Builder(this); /定义一个 AlertDialog.Builder 对象 builder.setTitle(“登录服务器对话框“); / 设置对话框的
4、标题 /装载/res/layout/login.xml 界面布局 TableLayout loginForm = (TableLayout)getLayoutInflater().inflate( R.layout.login, null); final EditText iptext = (EditText)loginForm.findViewById(R.id.ipedittext); builder.setView(loginForm); / 设置对话框显示的 View 对象 / 为对话框设置一个“登录”按钮 builder.setPositiveButton(“登录“ / 为按钮设置监
5、听器 , new OnClickListener() Override public void onClick(DialogInterface dialog, int which) /此处可执行登录处理 ipname = iptext.getText().toString().trim(); Bundle data = new Bundle(); data.putString(“ipname“,ipnam e); Intent intent = new Intent(GetIP.this,CameraTest.class); intent.putExtras(data); startActiv
6、ity(intent); ); / 为对话框设置一个“取消”按钮 builder.setNegativeButton(“取消“ , new OnClickListener() Override public void onClick(DialogInterface dialog, int which) /取消登录，不做任何事情。 System.exit(1); ); /创建、并显示对话框 builder.create().show(); （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
7、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(“depreca
8、tion“) Override public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); / 设置全屏 requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FUL LSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.main); / 获取
9、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
10、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 nu
11、ll ,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 param
12、eters.setPreviewSize(screenWidth , screenHeight); / 设置预览照片的大小 parameters.setPreviewFpsRange(20,30); / 每秒显示 2030 帧 parameters.setPictureFormat(ImageForm at.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 came
13、ra.setPreviewDisplay(surfaceHolde r); / 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 Stri
14、ng ipname; public StreamIt(String ipname) this.ipname = ipname; Override public void onPreviewFrame(byte data, Camera camera) Size size = camera.getParameters().getPreviewSize(); try /调用 pressToJpeg（）将 YUV 格式图像数据 data 转为 jpg 格式 YuvImage image = new YuvImage(data, ImageFormat.NV21, size.width, size.h
15、eight, null); if(image!=null) ByteArrayOutputStream outstream = new ByteArrayOutputStream(); pressToJpeg(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.getM
16、essage(); class MyThread extends Thread private byte byteBuffer = new byte1024; private OutputStream outsocket; private ByteArrayOutputStream myoutputstream; private String ipname; public MyThread(ByteArrayOutputStream myoutputstream,String ipname) this.myoutputstream = myoutputstream; this.ipname =
17、 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();
18、 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 ? public class ImageServer public static Se
19、rverSocket ss = null; public static void main(String args) throws IOException ss = new ServerSocket(6000); final ImageFrame frame = new ImageFrame(ss); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); while(true) frame.panel.getimage(); frame.repaint(); /* A frame with a
20、n image panel */ SuppressWarnings(“serial“) class ImageFrame extends JFrame public ImagePanel panel; public JButton jb; public ImageFrame(ServerSocket ss) / get screen dimensions Toolkit kit = Toolkit.getDefaultToolkit(); Dimension screenSize = kit.getScreenSize(); int screenHeight = screenSize.heig
21、ht; int screenWidth = screenSize.width; / center frame in screen setTitle(“ImageTest“); setLocation(screenWidth - DEFAULT_WIDTH) / 2, (screenHeight - DEFAULT_HEIGHT) / 2); setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT); / add panel to frame this.getContentPane().setLayout(null); panel = new ImagePanel(ss);
22、panel.setSize(640,480); panel.setLocation(0, 0); add(panel); jb = new JButton(“拍照“); jb.setBounds(0,480,640,50); add(jb); saveimage saveaction = new saveimage(ss); jb.addActionListener(saveaction); public static final int DEFAULT_WIDTH = 640; public static final int DEFAULT_HEIGHT = 560; /* A panel
23、that displays a tiled image */ SuppressWarnings(“serial“) class ImagePanel extends JPanel private ServerSocket ss; private Image image; private InputStream ins; public ImagePanel(ServerSocket ss) this.ss = ss; public void getimage() throws IOException Socket s = this.ss.accept(); System.out.println(
24、“连接成功!“); this.ins = s.getInputStream(); this.image = ImageIO.read(ins); this.ins.close(); public void paintComponent(Graphics g) super.paintComponent(g); if (image = null) return; g.drawImage(image, 0, 0, null); class saveimage implements ActionListener RandomAccessFile inFile = null; byte byteBuff
25、er = new byte1024; InputStream ins; private ServerSocket ss; public saveimage(ServerSocket ss) this.ss = ss; public void actionPerformed(ActionEvent event) try Socket s = ss.accept(); ins = s.getInputStream(); / 文件选择器以当前的目录打开 JFileChooser jfc = new JFileChooser(“.“); jfc.showSaveDialog(new javax.swi
26、ng.JFrame(); / 获取当前的选择文件引用 File savedFile = jfc.getSelectedFile(); / 已经选择了文件 if (savedFile != null) / 读取文件的数据，可以每次以快的方式读取数据 try inFile = new RandomAccessFile(savedFile, “rw“); catch (FileNotFoundException e) e.printStackTrace(); int amount; while (amount = ins.read(byteBuffer) != -1) inFile.write(by
27、teBuffer, 0, amount); inFile.close(); ins.close(); s.close(); javax.swing.JOptionPane.showMessageDialog(new javax.swing.JFrame(), “已接保存成功“, “提示!“, javax.swing.JOptionPane.PLAIN_MESSAGE); catch (IOException e) e.printStackTrace(); 开放源码如下（android 我使用的是 4.03 的 SDK，其它版本请自行更改。2.3.3 版本以 下的请注意 initCamera()里被注释掉的哪一行） 只能在 android4.04 系统的手机上运行成功哦。 下面是测试成功时的启动画面：
