Android下实现一个手机监控摄像头
16lz
2022-04-06
一直想在自己的Android手机上实现一个手机监控摄像头功能。今天逛论坛,看到一个例子,于是做了出来,留着以后完善。
功能点:
1。Android和PC通过socket通信。
2。Android下Camera的使用。
看代码:
package com.wenix.androidcameramonitor;import android.app.Activity;import android.app.AlertDialog;import android.app.AlertDialog.Builder;import android.content.DialogInterface;import android.content.DialogInterface.OnClickListener;import android.content.Intent;import android.os.Bundle;import android.view.Window;import android.view.WindowManager;import android.widget.EditText;import android.widget.TableLayout;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.activity_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, MainActivity.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(); }}
获取ip后就跳转到MainActivity。
package com.wenix.androidcameramonitor;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.OutputStream;import java.net.Socket;import android.app.Activity;import android.content.Intent;import android.graphics.ImageFormat;import android.graphics.Rect;import android.graphics.YuvImage;import android.hardware.Camera;import android.hardware.Camera.Size;import android.os.Bundle;import android.util.Log;import android.view.SurfaceHolder;import android.view.SurfaceHolder.Callback;import android.view.SurfaceView;import android.view.Window;import android.view.WindowManager;public class MainActivity 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;@Overridepublic 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.activity_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() {@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {}@Overridepublic void surfaceCreated(SurfaceHolder holder) {initCamera(); // 打开摄像头}@Overridepublic 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;}@Overridepublic 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。
PC端代码:
package com.wenix;import java.awt.Dimension;import java.awt.Graphics;import java.awt.Image;import java.awt.Toolkit;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.io.File;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;import java.io.RandomAccessFile;import java.net.ServerSocket;import java.net.Socket;import javax.imageio.ImageIO;import javax.swing.JButton;import javax.swing.JFileChooser;import javax.swing.JFrame;import javax.swing.JPanel;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(); } }}
运行结果如下:
手机视频:
pc端视频:
可以看到视频数据已经上传到了PC端。
接下来要完善的地方:
1。Android端可以提供一个Url,然后PC端使用浏览器来浏览。
2。PC端添加视频录制功能。
3。添加图像检测功能,比如运动物体检测等,这样就可以扩展为监控摄像头了。
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