Android 人脸识别

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

/**
     * 用来压缩图片的方法
     */
    private void resizePhoto() {
        BitmapFactory.Options options = new Options();
        options.inJustDecodeBounds = true;

        BitmapFactory.decodeFile(mcurrentPhotoPath, options);

        double ratio = Math.max(options.outWidth*1.0d/1024 , options.outHeight*1.0d/1024);

        options.inSampleSize = (int)Math.ceil(ratio);

        options.inJustDecodeBounds = false;

        mphotoImage = BitmapFactory.decodeFile(mcurrentPhotoPath, options);
    }

//开启图库
Intent intent = new Intent(Intent.ACTION_PICK);
                intent.setType("image/*");
                startActivityForResult(intent, PIC_CODE);
得到图片位置
@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        switch(requestCode) {
        //获取图片的路径
            case PIC_CODE:
                if(null != intent) {
                    Uri uri = intent.getData();
                    Cursor cursor = getContentResolver().query( uri, null, null, null, null);
                    if (cursor==null) {
                        Log.e("M", "null");
                    }
                    cursor.moveToFirst();

                    int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
                    mcurrentPhotoPath = cursor.getString(idx);
                    cursor.close();

                    resizePhoto();

                    photoView.setImageBitmap(mphotoImage);
                    num_detected.setText("");
                }
                break;

不装逼了，贴代码。
Mainactivity.class

package com.crazylin.facedetected;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.provider.MediaStore;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

import com.facepp.error.FaceppParseException;

public class MainActivity extends Activity implements OnClickListener {
    private static final int PIC_CODE = 0X110;
    private Button getImage_btn, image_detect_btn, capture_btn;
    private View loadingView;
    private ImageView photoView;
    private TextView num_detected;
    private String mcurrentPhotoPath;
    private Bitmap mphotoImage;
    private Handler mhandler;
    private Paint mPaint;
    private TextView infoText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_NO_TITLE);//隐藏标题
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                    WindowManager.LayoutParams.FLAG_FULLSCREEN);//设置全屏
        setContentView(R.layout.activity_main);

        initView();
        initEvent();

        initHandler();
        mPaint = new Paint();

    }

    private void initHandler() {
        mhandler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                switch(msg.what) {
                    case RESULT_OK:
                        loadingView.setVisibility(View.GONE);
                        JSONObject json = (JSONObject) msg.obj;
                        prepareResultBitmap(json);
                        photoView.setImageBitmap(mphotoImage);
                        break;
                    case RESULT_CANCELED:
                        loadingView.setVisibility(View.GONE);
                        String errorMessage = (String) msg.obj;

                        if(TextUtils.isEmpty(errorMessage)) {
                            num_detected.setText("Error");
                        }else {
                            num_detected.setText(errorMessage);
                        }
                        break;
                }
            }


        };
    }

    private void prepareResultBitmap(JSONObject json) {
        Bitmap bitmap = Bitmap.createBitmap(mphotoImage.getWidth(), mphotoImage.getHeight(), mphotoImage.getConfig());
        Canvas canvas = new Canvas(bitmap);
        canvas.drawBitmap(mphotoImage, 0, 0, null);
        try {
            JSONArray faces = json.getJSONArray("face");
            int faceCount = faces.length();
            num_detected.setText("find : " + faceCount);

            for(int i=0; i<faceCount; i++) {
                //单独的face对象
                JSONObject face = faces.getJSONObject(i);

                int age = face.getJSONObject("attribute").getJSONObject("age").getInt("value");
                String gender = face.getJSONObject("attribute").getJSONObject("gender").getString("value");
                //String race = face.getJSONObject("attribute").getJSONObject("race").getString("value");

                Bitmap infoBitmap = BuildBitmapInfo(age, gender);

                int infoWidth = infoBitmap.getWidth();
                int infoHeight = infoBitmap.getHeight();

                if((bitmap.getWidth() < photoView.getWidth())&&(bitmap.getHeight() < photoView.getHeight())) {
                    float ratio = Math.max(bitmap.getWidth()*1.0f/photoView.getWidth(), bitmap.getHeight()*1.0f/photoView.getHeight());
                    infoBitmap = Bitmap.createScaledBitmap(infoBitmap, (int)(infoWidth * ratio), (int)(infoHeight * ratio), false);
                }


                JSONObject position = face.getJSONObject("position");
                float x = (float) position.getJSONObject("center").getDouble("x");
                float y = (float) position.getJSONObject("center").getDouble("y");

                float w = (float) position.getDouble("width");
                float h = (float) position.getDouble("height");

                x = x/100*bitmap.getWidth();
                y = y/100*bitmap.getHeight();

                w = w/100*bitmap.getWidth();
                h = h/100*bitmap.getHeight();

                mPaint.setColor(0xffffffff);
                canvas.drawLine(x - w/2, y - h/2, x - w/2, y + h/2, mPaint);
                canvas.drawLine(x - w/2, y - h/2, x + w/2, y - h/2, mPaint);
                canvas.drawLine(x + w/2, y - h/2, x + w/2, y + h/2, mPaint);
                canvas.drawLine(x - w/2, y + h/2, x + w/2, y + h/2, mPaint);

                canvas.drawBitmap(infoBitmap, x - infoBitmap.getWidth()/2, y - h/2 - infoBitmap.getHeight(), null);

                mphotoImage = bitmap;

            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

    private Bitmap BuildBitmapInfo(int age, String gender) {
System.out.println(gender + " age:" + age);
        infoText.setText(gender + " age:" + age );
        infoText.setDrawingCacheEnabled(true);
        Bitmap bitmap =  Bitmap.createBitmap(infoText.getDrawingCache());
        infoText.destroyDrawingCache();
        return bitmap;
    }

    private void initEvent() {
        getImage_btn.setOnClickListener(this);
        image_detect_btn.setOnClickListener(this);
        capture_btn.setOnClickListener(this);
    }

    private void initView() {
        getImage_btn = (Button) findViewById(R.id.get_image);
        image_detect_btn = (Button) findViewById(R.id.detect_image);
        capture_btn = (Button) findViewById(R.id.capture_image);
        loadingView = findViewById(R.id.loading);
        photoView = (ImageView) findViewById(R.id.photo_image);
        num_detected = (TextView) findViewById(R.id.num_detected);
        infoText = (TextView) findViewById(R.id.info_text);

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        switch(requestCode) {
        //获取图片的路径
            case PIC_CODE:
                if(null != intent) {
                    Uri uri = intent.getData();
                    Cursor cursor = getContentResolver().query( uri, null, null, null, null);
                    if (cursor==null) {
                        Log.e("M", "null");
                    }
                    cursor.moveToFirst();

                    int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
                    mcurrentPhotoPath = cursor.getString(idx);
                    cursor.close();

                    resizePhoto();

                    photoView.setImageBitmap(mphotoImage);
                    num_detected.setText("");
                }
                break;
            case 2:
                Bitmap bmPhoto = (Bitmap) intent.getExtras().get("data");  
                mcurrentPhotoPath = "capturing";
                mphotoImage = bmPhoto;
                photoView.setImageBitmap(mphotoImage);
                num_detected.setText("");
                break;
        }
    }


    /**
     * 用来压缩图片的方法
     */
    private void resizePhoto() {
        BitmapFactory.Options options = new Options();
        options.inJustDecodeBounds = true;

        BitmapFactory.decodeFile(mcurrentPhotoPath, options);

        double ratio = Math.max(options.outWidth*1.0d/1024 , options.outHeight*1.0d/1024);

        options.inSampleSize = (int)Math.ceil(ratio);

        options.inJustDecodeBounds = false;

        mphotoImage = BitmapFactory.decodeFile(mcurrentPhotoPath, options);
    }

    @Override
    public void onClick(View v) {
        switch(v.getId()) {
            case R.id.get_image:
                Intent intent = new Intent(Intent.ACTION_PICK);
                intent.setType("image/*");
                startActivityForResult(intent, PIC_CODE);
                break;

            case R.id.capture_image:
                Intent intent2 = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);  
                startActivityForResult(intent2, 2);  
                break;
            case R.id.detect_image:
                loadingView.setVisibility(View.VISIBLE);
                if(mcurrentPhotoPath!=null && !mcurrentPhotoPath.trim().equals("")) {
                    if(mcurrentPhotoPath.equals("capturing")) {

                    }else {
                        resizePhoto();
                    }
                }else {
                    mphotoImage = BitmapFactory.decodeResource(getResources(), R.drawable.brother2);
                }

                FaceDetect.detect(mphotoImage, new FaceDetect.Callback() {
                    @Override
                    public void success(JSONObject result) {
                        Message msg = Message.obtain(mhandler);
                        msg.what = RESULT_OK;
                        msg.obj = result;
                        msg.sendToTarget();
                    }

                    @Override
                    public void error(FaceppParseException exception) {
                        Message msg = Message.obtain(mhandler);
                        msg.what = RESULT_CANCELED;
                        msg.obj = exception.getErrorMessage();
                        msg.sendToTarget();
                    }
                });
                break;
        }

    }

}

</code></pre>

mainactivity的对应布局文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" >

    <Button
        android:id="@+id/get_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_marginRight="10dp"
        android:text="Get Image" />

    <Button
        android:id="@+id/detect_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginRight="10dp"
        android:layout_toLeftOf="@+id/get_image"
        android:text="Detect" />

    <TextView
        android:id="@+id/num_detected"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginRight="10dp"
        android:layout_toLeftOf="@+id/detect_image"
        android:layout_alignTop="@+id/detect_image"
        android:gravity="center"
        android:text="find: 0" />

    <ImageView
        android:id="@+id/photo_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/detect_image"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true" 
        android:src="@drawable/brother2"/>

    <FrameLayout 
        android:id="@+id/loading"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clickable="true"
        android:visibility="gone">
        <ProgressBar 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"   
         />

        <TextView 
            android:id="@+id/info_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:visibility="invisible"
            android:textColor="#AEEEEEff"
            android:layout_gravity="center"
            android:textSize="18sp"
            android:text=" "
            />


    </FrameLayout>

    <Button
        android:id="@+id/capture_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/num_detected"
        android:layout_alignBottom="@+id/num_detected"
        android:layout_alignParentLeft="true"
        android:text="Capture" />

</RelativeLayout>

常量类

package com.crazylin.facedetected;

public class Constant {
    public static final String KEY = "a9f32d6fd94da04bc162caabe7e87400";
    public static final String SECRET = "BP9B_33cGnuwPOi4cq2bqNTTTeeLb3cV";
}

请求数据类

package com.crazylin.facedetected;

import java.io.ByteArrayOutputStream;

import org.json.JSONObject;

import android.graphics.Bitmap;
import android.util.Log;

import com.facepp.error.FaceppParseException;
import com.facepp.http.HttpRequests;
import com.facepp.http.PostParameters;

public class FaceDetect {
    public interface Callback {
        void success(JSONObject result);

        void error(FaceppParseException exeception);
    }

    public static void detect(final Bitmap bm,final Callback callback) {
        new Thread(new Runnable() {

            @Override
            public void run() {
                try {
                    //向Face++服务器提交请求
System.out.println("向Face++服务器提交请求");
                    HttpRequests requests = new HttpRequests(Constant.KEY, Constant.SECRET, true, true);
                    Bitmap bmsmall = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(), bm.getHeight());
                    ByteArrayOutputStream stream = new ByteArrayOutputStream();
                    bmsmall.compress(Bitmap.CompressFormat.JPEG, 50, stream);

                    byte[] bytes = stream.toByteArray();
                    PostParameters params = new PostParameters();
                    params.setImg(bytes);
                    JSONObject json = requests.detectionDetect(params);
                    Log.e("Tag", json.toString());

                    if (null != callback) {
                        callback.success(json);
                    }
                } catch (FaceppParseException e) {
                    System.out.println(e.toString());
                    e.printStackTrace();
                    if(null != callback) {
                        callback.error(e);
                    }
                }
            }
        }).start();
    }
}

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