Android下实现一个手机监控摄像头
Android下实现一个手机监控摄像头
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;
@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);
// 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();
}
}
}
这样就打开了socket，然后把camera获取的数据发送到PC端。
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