转载自http://blog.csdn.net/jesse__zhong/article/details/24889709

.......省略包

public class Staticdetection2Activity extends Activity {

final private static String TAG = "StaticrecognitionActivity";
final private int PICTURE_CHOOSE = 1;

private ImageView imageView = null;
private Bitmap img = null;
private Button buttonDetect = null;
private TextView textView = null;
private EditText editText = null;

// 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;
}
}
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_staticdetection2);
Button button = (Button) this.findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {

public void onClick(View arg0) {
// get a picture form your phone
Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, PICTURE_CHOOSE);
}
});

editText = (EditText) this.findViewById(R.id.editText1);
textView = (TextView) this.findViewById(R.id.textView1);

buttonDetect = (Button) this.findViewById(R.id.button2);
buttonDetect.setVisibility(View.INVISIBLE);
buttonDetect.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {

textView.setText("Waiting ...");

// use the red paint
/*
* Paint paint = new Paint(); paint.setColor(Color.RED);
* paint.setStrokeWidth(Math.max(img.getWidth(),
* img.getHeight()) / 100f);
*
* // create a new canvas Bitmap bitmap =
* Bitmap.createBitmap(img.getWidth(), img.getHeight(),
* img.getConfig()); Canvas canvas = new Canvas(bitmap);
* canvas.drawBitmap(img, new Matrix(), null);
*
* float x, y, w, h;
*
* x = y = w = h = 100;
*
* // change percent value to the real size x = x / 100 *
* img.getWidth(); w = w / 100 * img.getWidth() * 0.7f; y = y /
* 100 * img.getHeight(); h = h / 100 * img.getHeight() * 0.7f;
*
* // draw the box to mark it out canvas.drawLine(x - w, y - h,
* x - w, y + h, paint); canvas.drawLine(x - w, y - h, x + w, y
* - h, paint); canvas.drawLine(x + w, y + h, x - w, y + h,
* paint); canvas.drawLine(x + w, y + h, x + w, y - h, paint);
*
* img = bitmap;
*/

String xmlfilePath = "/sdcard/FaceDetect/haarcascade_frontalface_alt2.xml";

CascadeClassifier faceDetector = new CascadeClassifier(
xmlfilePath);

// Bitmap bmptest = BitmapFactory.decodeResource(getResources(),
// R.drawable.lena);
Mat testMat = new Mat();
Utils.bitmapToMat(img, testMat);

// Detect faces in the image.
// MatOfRect is a special container class for Rect.
MatOfRect faceDetections = new MatOfRect();
faceDetector.detectMultiScale(testMat, faceDetections);

Log.i(String.format("Detected %s faces",
faceDetections.toArray().length), "");

int facenum = 0;
// Draw a bounding box around each face.
for (Rect rect : faceDetections.toArray()) {
Core.rectangle(
testMat,
new Point(rect.x, rect.y),
new Point(rect.x + rect.width, rect.y + rect.height),
new Scalar(255, 0, 0));
++facenum;
}

// Save the visualized detection.
// Bitmap bmpdone = Bitmap.createBitmap(bmptest.getWidth(),
// bmptest.getHeight(), Config.RGB_565);
Utils.matToBitmap(testMat, img);
imageView.setImageBitmap(img);
textView.setText("Facecount:" + facenum);

/*Staticdetection2Activity.this.runOnUiThread(new Runnable() {

public void run() {
// show the image
imageView.setImageBitmap(img);
// textView.setText("Finished, "+ count + " faces.");
textView.setText("Finished, " + " faces.");
// set edit text
// editText.setText(str);
}
});*/
}
});

imageView = (ImageView) this.findViewById(R.id.imageView1);
imageView.setImageBitmap(img);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.staticdetection2, menu);
return true;
}

@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);

// the image picker callback
if (requestCode == PICTURE_CHOOSE) {
if (intent != null) {

Cursor cursor = getContentResolver().query(intent.getData(),
null, null, null, null);
cursor.moveToFirst();
int idx = cursor.getColumnIndex(ImageColumns.DATA);
String fileSrc = cursor.getString(idx);

Options options = new Options();
options.inJustDecodeBounds = true;
img = BitmapFactory.decodeFile(fileSrc, options);

options.inSampleSize = Math.max(1, (int) Math.ceil(Math.max(
(double) options.outWidth / 1024f,
(double) options.outHeight / 1024f)));
options.inJustDecodeBounds = false;
img = BitmapFactory.decodeFile(fileSrc, options);
textView.setText("Clik Detect. ==>");

imageView.setImageBitmap(img);
buttonDetect.setVisibility(View.VISIBLE);
} else {
Log.d(TAG, "idButSelPic Photopicker canceled");
}
}
}

@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_3, this,
mLoaderCallback);
}
}