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、
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="org.wanghai.CameraTest"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="15" />
<!-- 授予程序使用摄像头的权限 -->
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES"/>
<uses-permission android:name="android.permission.RESTART_PACKAGES"/>
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".GetIP"
android:screenOrientation="landscape"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".CameraTest"
android:screenOrientation="landscape"
android:label="@string/app_name" >
</activity>
</application>
</manifest>
（2）main.xml 设置surfaceview用于摄像头采集图像的预览
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<SurfaceView
android:id="@+id/sView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scaleType="fitCenter"/>
</LinearLayout>
（3）login.xml 登录界面，用于输入服务器IP
<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/loginForm"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TableRow>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="IP:"
android:textSize="10pt"
/>
<!-- 输入用户名的文本框 -->
<EditText
android:id="@+id/ipedittext"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:digits="0123456789."
android:hint="请填写服务器IP"
android:selectAllOnFocus="true"
/>
</TableRow>
</TableLayout>
（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
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,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",ipname);
Intent intent = new Intent(GetIP.this,CameraTest.class);
intent.putExtras(data);
startActivity(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
public class ImageServer {
public static ServerSocket 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 an 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.height;
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);
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 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("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 byteBuffer[] = new byte[1024];
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.swing.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(byteBuffer, 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：
源码链接：
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