Android调用OpenCV2.4.10实现二维码区域定位

package cn.hjq.android_capture; 
import java.io.BufferedWriter; 
import java.io.File; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.OutputStreamWriter; 
import java.util.ArrayList; 
import java.util.List; 
import org.opencv.android.BaseLoaderCallback; 
import org.opencv.android.LoaderCallbackInterface; 
import org.opencv.android.OpenCVLoader; 
import org.opencv.core.*; 
import org.opencv.highgui.*; 
import org.opencv.imgproc.*; 
import org.opencv.utils.Converters; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.Matrix; 
import android.hardware.Camera; 
import android.hardware.Camera.AutoFocusCallback; 
import android.hardware.Camera.Parameters; 
import android.hardware.Camera.PictureCallback; 
import android.os.Bundle; 
import android.os.Environment; 
import android.os.Handler; 
import android.app.Activity; 
import android.content.pm.ActivityInfo; 
import android.view.MotionEvent; 
import android.view.SurfaceHolder; 
import android.view.SurfaceHolder.Callback; 
import android.view.SurfaceView; 
import android.view.View; 
public class capture extends Activity { 
private SurfaceView picSV; 
private Camera camera; 
private String strPicPath; 
//OpenCV类库加载并初始化成功后的回调函数，在此我们不进行任何操作 
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) { 
@Override 
public void onManagerConnected(int status) { 
switch (status) { 
case LoaderCallbackInterface.SUCCESS:{ 
} break; 
default:{ 
super.onManagerConnected(status); 
} break; 
} 
} 
}; 
@SuppressWarnings("deprecation") 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); 
setContentView(R.layout.main); 
picSV = (SurfaceView) findViewById(R.id.picSV); 
picSV.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 
picSV.getHolder().addCallback(new MyCallback()); 
} 
private class MyCallback implements Callback{ 
//我们在SurfaceView创建的时候就要进行打开摄像头、设置预览取景所在的SurfaceView、设置拍照的参数、开启预览取景等操作 
@Override 
public void surfaceCreated(SurfaceHolder holder) { 
try { 
camera = Camera.open();//打开摄像头 
camera.setPreviewDisplay(picSV.getHolder());//设置picSV来进行预览取景 
Parameters params = camera.getParameters();//获取照相机的参数 
params.setPictureSize(800, 480);//设置照片的大小为800*480 
params.setPreviewSize(800, 480);//设置预览取景的大小为800*480 
params.setFlashMode("auto");//开启闪光灯 
params.setJpegQuality(50);//设置图片质量为50   
camera.setParameters(params);//设置以上参数为照相机的参数 
camera.startPreview(); 
} 
catch (IOException e) {    //开始预览取景，然后我们就可以拍照了 
e.printStackTrace(); 
} 
} 
@Override 
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { 
} 
@Override 
public void surfaceDestroyed(SurfaceHolder holder) { 
//当SurfaceView销毁时，我们进行停止预览、释放摄像机、垃圾回收等工作 
camera.stopPreview(); 
camera.release(); 
camera = null; 
} 
} 
public void takepic(View v){ 
//在我们开始拍照前，实现自动对焦 
camera.autoFocus(new MyAutoFocusCallback()); 
} 
private class MyAutoFocusCallback implements AutoFocusCallback{ 
@Override 
public void onAutoFocus(boolean success, Camera camera) { 
//开始拍照 
camera.takePicture(null, null, null, new MyPictureCallback()); 
} 
} 
private class MyPictureCallback implements PictureCallback{ 
@Override 
public void onPictureTaken(byte[] data, Camera camera) { 
try { 
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length); 
Matrix matrix = new Matrix(); 
matrix.preRotate(90); 
bitmap = Bitmap.createBitmap(bitmap ,0,0, bitmap.getWidth(), 
bitmap.getHeight(),matrix,true); 
strPicPath = 
Environment.getExternalStorageDirectory()+"/1Zxing/"+System.currentTimeMillis()+".jpg"; 
FileOutputStream fos = new FileOutputStream( strPicPath ); 
bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos); 
fos.close(); 
Handler mHandler = new Handler(); 
mHandler.post(mRunnable); 
camera.startPreview(); 
} 
catch (Exception e) { 
e.printStackTrace(); 
} 
} 
} 
public boolean onTouchEvent (MotionEvent event) 
{ 
int Action = event.getAction(); 
if ( 1 == Action ) { 
camera.autoFocus(new MyAutoFocusCallback1()); 
} 
return true; 
} 
private class MyAutoFocusCallback1 implements AutoFocusCallback { 
@Override 
public void onAutoFocus(boolean success, Camera camera) { 
} 
} 
@Override 
public void onResume(){ 
super.onResume(); 
//通过OpenCV引擎服务加载并初始化OpenCV类库，所谓OpenCV引擎服务即是 
//OpenCV_2.4.3.2_Manager_2.4_*.apk程序包，存在于OpenCV安装包的apk目录中 
OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_10, this, mLoaderCallback); 
} 
Runnable mRunnable = new Runnable() { 
public void run() { 
List<MatOfPoint  contours = new ArrayList<MatOfPoint (); 
String strMissingTime = null; 
Mat srcColor = new Mat(), srcColorResize = new Mat(); 
Mat srcGray = new Mat(), srcGrayResize = new Mat(), srcGrayResizeThresh = new Mat(); 
srcGray = Highgui.imread(strPicPath, 0); 
srcColor = Highgui.imread(strPicPath, 1); 
Imgproc.resize(srcGray, srcGrayResize, new Size(srcGray.cols()*0.2,srcGray.rows()*0.2)); 
Imgproc.resize(srcColor, srcColorResize, new Size(srcGray.cols()*0.2,srcGray.rows()*0.2)); 
long start = System.currentTimeMillis(); 
//二值化加轮廓寻找 
Imgproc.adaptiveThreshold(srcGrayResize, srcGrayResizeThresh, 255, 
Imgproc.ADAPTIVE_THRESH_GAUSSIAN_C, 
Imgproc.THRESH_BINARY, 35, 5); 
Imgproc.findContours(srcGrayResizeThresh, contours, new Mat(), 
Imgproc.RETR_LIST, Imgproc.CHAIN_APPROX_NONE); 
long end = System.currentTimeMillis(); 
strMissingTime = String.valueOf( end - start ); 
strMissingTime = strMissingTime + "\r"; 
//轮廓绘制 
for ( int i = contours.size()-1; i  = 0; i-- ) 
{ 
MatOfPoint2f NewMtx = new MatOfPoint2f( contours.get(i).toArray() ); 
RotatedRect rotRect = Imgproc.minAreaRect( NewMtx ); 
Point vertices[] = new Point[4]; 
rotRect.points(vertices); 
List<Point  rectArea = new ArrayList<Point (); 
for ( int n = 0; n < 4; n ++ ) 
{ 
Point temp = new Point(); 
temp.x = vertices[n].x; 
temp.y = vertices[n].y; 
rectArea.add(temp); 
} 
Mat rectMat = Converters.vector_Point_to_Mat(rectArea); 
double minRectArea = Imgproc.contourArea( rectMat ); 
Point center = new Point(); 
float radius[] = {0}; 
Imgproc.minEnclosingCircle(NewMtx, center, radius); 
if( 
Imgproc.contourArea( contours.get(i)) < 300 || 
Imgproc.contourArea( contours.get(i))   3000 
|| minRectArea < radius[0]*radius[0]*1.57 
) contours.remove(i); 
} 
Imgproc.drawContours(srcColorResize, contours, -1, new Scalar(255,0,0)); 
Highgui.imwrite(Environment.getExternalStorageDirectory()+"/1Zxing/" 
+System.currentTimeMillis()+"contour.jpg", srcColorResize);   
File file=new File(Environment.getExternalStorageDirectory()+"/1Zxing/","log.txt"); 
BufferedWriter out = null; 
try { 
out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file, true))); 
out.write(strMissingTime); 
out.close(); 
} 
catch (Exception e) { 
e.printStackTrace(); 
}    
} 
}; 
} 

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
tools:context=".MainActivity"   
<SurfaceView 
android:id="@+id/picSV" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
</SurfaceView  
<ImageButton 
android:contentDescription="@string/desc" 
android:onClick="takepic" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:layout_gravity="right|top" 
android:src="@android:drawable/ic_menu_camera" /  
</FrameLayout  

<resources  
<string name="app_name" Code</string  
<string name="desc" Take picture button</string  
</resources  

<resources  
<!-- 
Base application theme, dependent on API level. This theme is replaced 
by AppBaseTheme from res/values-vXX/styles.xml on newer devices. 
--  
<style name="AppBaseTheme" parent="android:Theme.Light"  
<!-- 
Theme customizations available in newer API levels can go in 
res/values-vXX/styles.xml, while customizations related to 
backward-compatibility can go here. 
--  
</style  
<!-- Application theme. --  
<style name="AppTheme" parent="AppBaseTheme"  
<!-- All customizations that are NOT specific to a particular API-level can go here. --  
<item name="android:windowNoTitle" true</item  
<item name="android:windowFullscreen" true</item  
</style  
</resources  

<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
package="cn.hjq.android_capture" 
android:versionCode="1" 
android:versionName="1.0"   
<uses-permission 
android:name="android.permission.CAMERA"/  
<uses-permission 
android:name="android.permission.WRITE_EXTERNAL_STORAGE"/  
<uses-sdk 
android:minSdkVersion="8" 
android:targetSdkVersion="19" /  
<application 
android:allowBackup="true" 
android:icon="@drawable/ic_launcher" 
android:label="@string/app_name" 
android:theme="@style/AppTheme"   
<activity 
android:name=".capture"   
<intent-filter   
<action android:name="android.intent.action.MAIN" /  
<category android:name="android.intent.category.LAUNCHER" /  
</intent-filter  
</activity  
</application  
</manifest