Android人脸识别技术，可以参考下面的网站。
http://www.faceplusplus.com.cn/
本项目使用的就是该网站的api.

项目具体使用的技术代码

  1. /**
  2.      * 用来压缩图片的方法
  3.      */
  4.     private void resizePhoto() {
  5.         BitmapFactory.Options options = new Options();
  6.         options.inJustDecodeBounds = true;
  8.         BitmapFactory.decodeFile(mcurrentPhotoPath, options);
  10.         double ratio = Math.max(options.outWidth*1.0d/1024 , options.outHeight*1.0d/1024);
  12.         options.inSampleSize = (int)Math.ceil(ratio);
  14.         options.inJustDecodeBounds = false;
  16.         mphotoImage = BitmapFactory.decodeFile(mcurrentPhotoPath, options);
  17.     }
  1. //开启图库
  2. Intent intent = new Intent(Intent.ACTION_PICK);
  3.                 intent.setType("image/*");
  4.                 startActivityForResult(intent, PIC_CODE);
  5. 得到图片位置
  6. @Override
  7.     protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
  8.         switch(requestCode) {
  9.         //获取图片的路径
  10.             case PIC_CODE:
  11.                 if(null != intent) {
  12.                     Uri uri = intent.getData();
  13.                     Cursor cursor = getContentResolver().query( uri, null, null, null, null);
  14.                     if (cursor==null) {
  15.                         Log.e("M", "null");
  16.                     }
  17.                     cursor.moveToFirst();
  19.                     int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
  20.                     mcurrentPhotoPath = cursor.getString(idx);
  21.                     cursor.close();
  23.                     resizePhoto();
  25.                     photoView.setImageBitmap(mphotoImage);
  26.                     num_detected.setText("");
  27.                 }
  28.                 break;

不装逼了，贴代码。
Mainactivity.class

  1. package com.crazylin.facedetected;
  3. import org.json.JSONArray;
  4. import org.json.JSONException;
  5. import org.json.JSONObject;
  7. import android.app.Activity;
  8. import android.content.Intent;
  9. import android.database.Cursor;
  10. import android.graphics.Bitmap;
  11. import android.graphics.BitmapFactory;
  12. import android.graphics.BitmapFactory.Options;
  13. import android.graphics.Canvas;
  14. import android.graphics.Paint;
  15. import android.net.Uri;
  16. import android.os.Bundle;
  17. import android.os.Handler;
  18. import android.os.Message;
  19. import android.provider.MediaStore;
  20. import android.text.TextUtils;
  21. import android.util.Log;
  22. import android.view.View;
  23. import android.view.View.OnClickListener;
  24. import android.view.Window;
  25. import android.view.WindowManager;
  26. import android.widget.Button;
  27. import android.widget.ImageView;
  28. import android.widget.TextView;
  30. import com.facepp.error.FaceppParseException;
  32. public class MainActivity extends Activity implements OnClickListener {
  33.     private static final int PIC_CODE = 0X110;
  34.     private Button getImage_btn, image_detect_btn, capture_btn;
  35.     private View loadingView;
  36.     private ImageView photoView;
  37.     private TextView num_detected;
  38.     private String mcurrentPhotoPath;
  39.     private Bitmap mphotoImage;
  40.     private Handler mhandler;
  41.     private Paint mPaint;
  42.     private TextView infoText;
  44.     @Override
  45.     protected void onCreate(Bundle savedInstanceState) {
  46.         super.onCreate(savedInstanceState);
  48.         requestWindowFeature(Window.FEATURE_NO_TITLE);//隐藏标题
  49.         getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
  50.                     WindowManager.LayoutParams.FLAG_FULLSCREEN);//设置全屏
  51.         setContentView(R.layout.activity_main);
  53.         initView();
  54.         initEvent();
  56.         initHandler();
  57.         mPaint = new Paint();
  59.     }
  61.     private void initHandler() {
  62.         mhandler = new Handler() {
  63.             @Override
  64.             public void handleMessage(Message msg) {
  65.                 switch(msg.what) {
  66.                     case RESULT_OK:
  67.                         loadingView.setVisibility(View.GONE);
  68.                         JSONObject json = (JSONObject) msg.obj;
  69.                         prepareResultBitmap(json);
  70.                         photoView.setImageBitmap(mphotoImage);
  71.                         break;
  72.                     case RESULT_CANCELED:
  73.                         loadingView.setVisibility(View.GONE);
  74.                         String errorMessage = (String) msg.obj;
  76.                         if(TextUtils.isEmpty(errorMessage)) {
  77.                             num_detected.setText("Error");
  78.                         }else {
  79.                             num_detected.setText(errorMessage);
  80.                         }
  81.                         break;
  82.                 }
  83.             }
  86.         };
  87.     }
  89.     private void prepareResultBitmap(JSONObject json) {
  90.         Bitmap bitmap = Bitmap.createBitmap(mphotoImage.getWidth(), mphotoImage.getHeight(), mphotoImage.getConfig());
  91.         Canvas canvas = new Canvas(bitmap);
  92.         canvas.drawBitmap(mphotoImage, 0, 0, null);
  93.         try {
  94.             JSONArray faces = json.getJSONArray("face");
  95.             int faceCount = faces.length();
  96.             num_detected.setText("find : " + faceCount);
  98.             for(int i=0; i<faceCount; i++) {
  99.                 //单独的face对象
  100.                 JSONObject face = faces.getJSONObject(i);
  102.                 int age = face.getJSONObject("attribute").getJSONObject("age").getInt("value");
  103.                 String gender = face.getJSONObject("attribute").getJSONObject("gender").getString("value");
  104.                 //String race = face.getJSONObject("attribute").getJSONObject("race").getString("value");
  106.                 Bitmap infoBitmap = BuildBitmapInfo(age, gender);
  108.                 int infoWidth = infoBitmap.getWidth();
  109.                 int infoHeight = infoBitmap.getHeight();
  111.                 if((bitmap.getWidth() < photoView.getWidth())&&(bitmap.getHeight() < photoView.getHeight())) {
  112.                     float ratio = Math.max(bitmap.getWidth()*1.0f/photoView.getWidth(), bitmap.getHeight()*1.0f/photoView.getHeight());
  113.                     infoBitmap = Bitmap.createScaledBitmap(infoBitmap, (int)(infoWidth * ratio), (int)(infoHeight * ratio), false);
  114.                 }
  117.                 JSONObject position = face.getJSONObject("position");
  118.                 float x = (float) position.getJSONObject("center").getDouble("x");
  119.                 float y = (float) position.getJSONObject("center").getDouble("y");
  121.                 float w = (float) position.getDouble("width");
  122.                 float h = (float) position.getDouble("height");
  124.                 x = x/100*bitmap.getWidth();
  125.                 y = y/100*bitmap.getHeight();
  127.                 w = w/100*bitmap.getWidth();
  128.                 h = h/100*bitmap.getHeight();
  130.                 mPaint.setColor(0xffffffff);
  131.                 canvas.drawLine(x - w/2, y - h/2, x - w/2, y + h/2, mPaint);
  132.                 canvas.drawLine(x - w/2, y - h/2, x + w/2, y - h/2, mPaint);
  133.                 canvas.drawLine(x + w/2, y - h/2, x + w/2, y + h/2, mPaint);
  134.                 canvas.drawLine(x - w/2, y + h/2, x + w/2, y + h/2, mPaint);
  136.                 canvas.drawBitmap(infoBitmap, x - infoBitmap.getWidth()/2, y - h/2 - infoBitmap.getHeight(), null);
  138.                 mphotoImage = bitmap;
  140.             }
  141.         } catch (JSONException e) {
  142.             e.printStackTrace();
  143.         }
  144.     }
  146.     private Bitmap BuildBitmapInfo(int age, String gender) {
  147. System.out.println(gender + " age:" + age);
  148.         infoText.setText(gender + " age:" + age );
  149.         infoText.setDrawingCacheEnabled(true);
  150.         Bitmap bitmap =  Bitmap.createBitmap(infoText.getDrawingCache());
  151.         infoText.destroyDrawingCache();
  152.         return bitmap;
  153.     }
  155.     private void initEvent() {
  156.         getImage_btn.setOnClickListener(this);
  157.         image_detect_btn.setOnClickListener(this);
  158.         capture_btn.setOnClickListener(this);
  159.     }
  161.     private void initView() {
  162.         getImage_btn = (Button) findViewById(R.id.get_image);
  163.         image_detect_btn = (Button) findViewById(R.id.detect_image);
  164.         capture_btn = (Button) findViewById(R.id.capture_image);
  165.         loadingView = findViewById(R.id.loading);
  166.         photoView = (ImageView) findViewById(R.id.photo_image);
  167.         num_detected = (TextView) findViewById(R.id.num_detected);
  168.         infoText = (TextView) findViewById(R.id.info_text);
  170.     }
  172.     @Override
  173.     protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
  174.         switch(requestCode) {
  175.         //获取图片的路径
  176.             case PIC_CODE:
  177.                 if(null != intent) {
  178.                     Uri uri = intent.getData();
  179.                     Cursor cursor = getContentResolver().query( uri, null, null, null, null);
  180.                     if (cursor==null) {
  181.                         Log.e("M", "null");
  182.                     }
  183.                     cursor.moveToFirst();
  185.                     int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
  186.                     mcurrentPhotoPath = cursor.getString(idx);
  187.                     cursor.close();
  189.                     resizePhoto();
  191.                     photoView.setImageBitmap(mphotoImage);
  192.                     num_detected.setText("");
  193.                 }
  194.                 break;
  195.             case 2:
  196.                 Bitmap bmPhoto = (Bitmap) intent.getExtras().get("data");  
  197.                 mcurrentPhotoPath = "capturing";
  198.                 mphotoImage = bmPhoto;
  199.                 photoView.setImageBitmap(mphotoImage);
  200.                 num_detected.setText("");
  201.                 break;
  202.         }
  203.     }
  206.     /**
  207.      * 用来压缩图片的方法
  208.      */
  209.     private void resizePhoto() {
  210.         BitmapFactory.Options options = new Options();
  211.         options.inJustDecodeBounds = true;
  213.         BitmapFactory.decodeFile(mcurrentPhotoPath, options);
  215.         double ratio = Math.max(options.outWidth*1.0d/1024 , options.outHeight*1.0d/1024);
  217.         options.inSampleSize = (int)Math.ceil(ratio);
  219.         options.inJustDecodeBounds = false;
  221.         mphotoImage = BitmapFactory.decodeFile(mcurrentPhotoPath, options);
  222.     }
  224.     @Override
  225.     public void onClick(View v) {
  226.         switch(v.getId()) {
  227.             case R.id.get_image:
  228.                 Intent intent = new Intent(Intent.ACTION_PICK);
  229.                 intent.setType("image/*");
  230.                 startActivityForResult(intent, PIC_CODE);
  231.                 break;
  233.             case R.id.capture_image:
  234.                 Intent intent2 = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);  
  235.                 startActivityForResult(intent2, 2);  
  236.                 break;
  237.             case R.id.detect_image:
  238.                 loadingView.setVisibility(View.VISIBLE);
  239.                 if(mcurrentPhotoPath!=null && !mcurrentPhotoPath.trim().equals("")) {
  240.                     if(mcurrentPhotoPath.equals("capturing")) {
  242.                     }else {
  243.                         resizePhoto();
  244.                     }
  245.                 }else {
  246.                     mphotoImage = BitmapFactory.decodeResource(getResources(), R.drawable.brother2);
  247.                 }
  249.                 FaceDetect.detect(mphotoImage, new FaceDetect.Callback() {
  250.                     @Override
  251.                     public void success(JSONObject result) {
  252.                         Message msg = Message.obtain(mhandler);
  253.                         msg.what = RESULT_OK;
  254.                         msg.obj = result;
  255.                         msg.sendToTarget();
  256.                     }
  258.                     @Override
  259.                     public void error(FaceppParseException exception) {
  260.                         Message msg = Message.obtain(mhandler);
  261.                         msg.what = RESULT_CANCELED;
  262.                         msg.obj = exception.getErrorMessage();
  263.                         msg.sendToTarget();
  264.                     }
  265.                 });
  266.                 break;
  267.         }
  269.     }
  271. }
  273. </code></pre>

mainactivity的对应布局文件

  1. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  2.     android:layout_width="wrap_content"
  3.     android:layout_height="wrap_content" >
  5.     <Button
  6.         android:id="@+id/get_image"
  7.         android:layout_width="wrap_content"
  8.         android:layout_height="wrap_content"
  9.         android:layout_alignParentBottom="true"
  10.         android:layout_alignParentRight="true"
  11.         android:layout_marginRight="10dp"
  12.         android:text="Get Image" />
  14.     <Button
  15.         android:id="@+id/detect_image"
  16.         android:layout_width="wrap_content"
  17.         android:layout_height="wrap_content"
  18.         android:layout_alignParentBottom="true"
  19.         android:layout_marginRight="10dp"
  20.         android:layout_toLeftOf="@+id/get_image"
  21.         android:text="Detect" />
  23.     <TextView
  24.         android:id="@+id/num_detected"
  25.         android:layout_width="wrap_content"
  26.         android:layout_height="wrap_content"
  27.         android:layout_alignParentBottom="true"
  28.         android:layout_marginRight="10dp"
  29.         android:layout_toLeftOf="@+id/detect_image"
  30.         android:layout_alignTop="@+id/detect_image"
  31.         android:gravity="center"
  32.         android:text="find: 0" />
  34.     <ImageView
  35.         android:id="@+id/photo_image"
  36.         android:layout_width="wrap_content"
  37.         android:layout_height="wrap_content"
  38.         android:layout_above="@+id/detect_image"
  39.         android:layout_alignParentLeft="true"
  40.         android:layout_alignParentRight="true"
  41.         android:layout_alignParentTop="true" 
  42.         android:src="@drawable/brother2"/>
  44.     <FrameLayout 
  45.         android:id="@+id/loading"
  46.         android:layout_width="match_parent"
  47.         android:layout_height="match_parent"
  48.         android:clickable="true"
  49.         android:visibility="gone">
  50.         <ProgressBar 
  51.             android:layout_width="wrap_content"
  52.             android:layout_height="wrap_content"
  53.             android:layout_gravity="center"   
  54.          />
  56.         <TextView 
  57.             android:id="@+id/info_text"
  58.             android:layout_width="wrap_content"
  59.             android:layout_height="wrap_content"
  60.             android:visibility="invisible"
  61.             android:textColor="#AEEEEEff"
  62.             android:layout_gravity="center"
  63.             android:textSize="18sp"
  64.             android:text=" "
  65.             />
  68.     </FrameLayout>
  70.     <Button
  71.         android:id="@+id/capture_image"
  72.         android:layout_width="wrap_content"
  73.         android:layout_height="wrap_content"
  74.         android:layout_alignBaseline="@+id/num_detected"
  75.         android:layout_alignBottom="@+id/num_detected"
  76.         android:layout_alignParentLeft="true"
  77.         android:text="Capture" />
  79. </RelativeLayout>

常量类

  1. package com.crazylin.facedetected;
  3. public class Constant {
  4.     public static final String KEY = "a9f32d6fd94da04bc162caabe7e87400";
  5.     public static final String SECRET = "BP9B_33cGnuwPOi4cq2bqNTTTeeLb3cV";
  6. }

请求数据类

  1. package com.crazylin.facedetected;
  3. import java.io.ByteArrayOutputStream;
  5. import org.json.JSONObject;
  7. import android.graphics.Bitmap;
  8. import android.util.Log;
  10. import com.facepp.error.FaceppParseException;
  11. import com.facepp.http.HttpRequests;
  12. import com.facepp.http.PostParameters;
  14. public class FaceDetect {
  15.     public interface Callback {
  16.         void success(JSONObject result);
  18.         void error(FaceppParseException exeception);
  19.     }
  21.     public static void detect(final Bitmap bm,final Callback callback) {
  22.         new Thread(new Runnable() {
  24.             @Override
  25.             public void run() {
  26.                 try {
  27.                     //向Face++服务器提交请求
  28. System.out.println("向Face++服务器提交请求");
  29.                     HttpRequests requests = new HttpRequests(Constant.KEY, Constant.SECRET, true, true);
  30.                     Bitmap bmsmall = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(), bm.getHeight());
  31.                     ByteArrayOutputStream stream = new ByteArrayOutputStream();
  32.                     bmsmall.compress(Bitmap.CompressFormat.JPEG, 50, stream);
  34.                     byte[] bytes = stream.toByteArray();
  35.                     PostParameters params = new PostParameters();
  36.                     params.setImg(bytes);
  37.                     JSONObject json = requests.detectionDetect(params);
  38.                     Log.e("Tag", json.toString());
  40.                     if (null != callback) {
  41.                         callback.success(json);
  42.                     }
  43.                 } catch (FaceppParseException e) {
  44.                     System.out.println(e.toString());
  45.                     e.printStackTrace();
  46.                     if(null != callback) {
  47.                         callback.error(e);
  48.                     }
  49.                 }
  50.             }
  51.         }).start();
  52.     }
  53. }

ok,需要的尽管拿走吧。
下载地址
http://download.csdn.net/detail/u013270444/9437964

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