人脸识别1：n对比 （一）

　　本项目采用了 Face++人脸识别 第三方接口，实现了自选本地手机相册图片上传人脸（faceSet中添加人脸） 和 自选本地手机相册图片寻找出集合中相似度最高的一个face，可返回比对相似度等信息。 

项目具体步骤如下：

一 、所需权限

    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

二、第三方app id app key

项目采用了Face++第三方接口，可自行注册获取

三、添加依赖和sdk

1. 将FaceppSDK.jar文件放到libs路径下。

2. gradle中添加一下依赖：

//导入sdk
compile files('libs/FaceppSDK.jar')

四、布局文件

人脸寻找1：n

主要代码：

<?xml version="1.0" encoding="utf-8"?>
<ScrollView
    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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.lifen.facesearchdemo.MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:weightSum="1">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <ImageView
                android:id="@+id/img1"
                android:layout_width="0dp"
                android:layout_height="180dp"
                android:layout_weight="1.02"
                android:scaleType="centerCrop"
                android:src="@drawable/head"/>

            <ScrollView
                android:layout_weight="0.74"
                android:layout_width="60dp"
                android:layout_height="match_parent">
                <TextView
                    android:id="@+id/addRresultTV"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:gravity="center"
                    android:text="添加结果"
                    android:textColor="@android:color/black" />
            </ScrollView>

        </LinearLayout>

        <EditText
            android:id="@+id/uidEt"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="请输入uid(名字)"
            android:inputType="textPersonName" />

        <Button
            android:id="@+id/addFaceBtn"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="添加" />

        <Button
            android:id="@+id/searchBtn"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="@dimen/activity_horizontal_margin"
            android:text="寻找" />

        <TextView
            android:id="@+id/resultBtn"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="@dimen/activity_horizontal_margin"
            android:background="#eeeeee"
            android:padding="6dp"
            android:layout_weight="2.94" />

    </LinearLayout>
</ScrollView>

页面包含：

　　① ImageView 点击ImageView 可跳转手机相册，选择要使用的图片。

　　② TextView1  faceSet添加face 结果再次显示

　　③ EditText 设定face 的user_uid

　　④ button1 添加人脸按钮

　　⑤ button2 寻找相似度最高人脸按钮

　　⑥ TextView2 寻找结果展示view

　faceSet 中添加 face过程：

　　1. 点击imageView 选取图片

　　2. 输入uid

　　3. 点击添加

　寻找相似度最高face过程：

　　1.点击imageView 选取图片

　　2. 点击寻找按钮

 五、页面activity

主要代码：

package com.example.lifen.facesearchdemo;

import android.content.ContentResolver;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.util.Base64;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.megvii.cloud.http.CommonOperate;
import com.megvii.cloud.http.FaceOperate;
import com.megvii.cloud.http.FaceSetOperate;
import com.megvii.cloud.http.Response;

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

import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.util.ArrayList;

/**
 * 人脸对比 1：1
 *
 * @author LiFen
 */
public class MainActivity extends AppCompatActivity {
    private static final String TAG = "MainActivity";
    private static final int REQUEST_CODE1 = 11;
    ImageView mImageView1;
    Button mSearchBtn;
    private Button mAddFaceBtn;
    TextView mResultText;
    private TextView mAddResultText;
    private String mImgBase641;
    private EditText uidEidtText;
    ArrayList<String> faces = new ArrayList<>();
    String key = "";//api_key
    String secret = "";//api_secret
    private final static int i = 100;
    private final static int j = 200;
    private final static int s = 300;
    private Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            if(msg.what == i){
                mAddResultText.setText((String)msg.obj);
            }
            if(msg.what == j){
                mAddResultText.append((String)msg.obj);
            }
            if(msg.what == s){
                mResultText.setText((String)msg.obj);
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mImageView1 = (ImageView) findViewById(R.id.img1);
        mSearchBtn = (Button) findViewById(R.id.searchBtn);
        mAddFaceBtn = (Button)findViewById(R.id.addFaceBtn);
        mResultText = (TextView) findViewById(R.id.resultBtn);
        mAddResultText = (TextView)findViewById(R.id.addRresultTV);
        uidEidtText = (EditText)findViewById(R.id.uidEt);
        if(TextUtils.isEmpty(key) || TextUtils.isEmpty(secret)){
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setMessage("please enter key and secret");
            builder.setTitle("");
            builder.show();
            return;
        }
        mImageView1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startAlbumActivity(REQUEST_CODE1);
            }
        });
        mAddFaceBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                addFace();
            }
        });
        mSearchBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startSearch();
            }
        });
    }

    private void addFace(){
        if ("".equals(mImgBase641) || mImgBase641 == null) {
            Toast.makeText(this, "请选择图片再添加", Toast.LENGTH_SHORT).show();
            return;
        }
        if(uidEidtText.getText().toString().equals("")){
            Toast.makeText(this,"请输入uid(名字)",Toast.LENGTH_SHORT).show();
            return;
        }
        mResultText.setText("人脸添加中...");
        new Thread(new Runnable() {
            @Override
            public void run() {
                CommonOperate commonOperate = new CommonOperate(key, secret, false);
                try{
                    //获取faceToken
                    Response response = commonOperate.detectBase64(mImgBase641, 0, null);
                    FaceOperate faceOperate = new FaceOperate(key,secret,false);
                    String faceToken = getFaceToken(response);
                    String uid = uidEidtText.getText().toString();
                    Log.i(TAG, "run: " + uid);
                    faceOperate.faceSetUserId(faceToken, uid);
                    faces.add(faceToken);
                    Message msg = new Message();
                    msg.what = i;
                    msg.obj = faceToken;
                    handler.sendMessage(msg);
                    //faceSet中添加faceToken
                    FaceSetOperate FaceSet = new FaceSetOperate(key, secret, false);
                    String faceTokens = creatFaceTokens(faces);
                    Response faceSet = FaceSet.addFaceByFaceToken(faceTokens, "469e42d27947506b44cee9a8dba2eb4f");
                    String result = new String(faceSet.getContent());
                    msg.what = j;
                    msg.obj = result;
                    handler.sendMessage(msg);
                }catch (Exception e){
                    Log.i(TAG, "addFace: " +e.toString());
                }
            }
        }).start();
    }

    private void startSearch() {
        if ("".equals(mImgBase641) || mImgBase641 == null) {
            Toast.makeText(this, "请选择图片再寻找", Toast.LENGTH_SHORT).show();
            return;
        }
        mResultText.setText("搜索比对中...");
        new Thread(new Runnable() {
            @Override
            public void run() {
                Log.i(TAG, "run() called");
                CommonOperate commonOperate = new CommonOperate(key, secret, false);
                //获取faceToken
                Response response = null;
                try {
                    response = commonOperate.detectBase64(mImgBase641, 0, null);
                    String faceToken = getFaceToken(response);
                    Response searchByOuterId = commonOperate.searchByOuterId(faceToken, null, null, "test", 1);
                    Message msg = new Message();
                    msg.what = s;
                    String result = new String(searchByOuterId.getContent());
                    msg.obj = result;
                    handler.sendMessage(msg);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }

    private void startAlbumActivity(int requestCode) {
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(intent, requestCode);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (data == null)
            return;
        Uri uri = data.getData();
        Log.e("uri", uri.toString());
        ContentResolver cr = this.getContentResolver();
        Bitmap bitmap = null;
        try {
            bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri));
                /* 将Bitmap设定到ImageView */
        } catch (FileNotFoundException e) {
            Log.e("Exception", e.getMessage(), e);
        }
        if (resultCode == RESULT_OK && requestCode == REQUEST_CODE1) {
            mImageView1.setImageBitmap(bitmap);
            mImgBase641 = bitmapToBase64(bitmap);
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

    private String bitmapToBase64(Bitmap bitmap) {
        ByteArrayOutputStream bStream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.JPEG, 80, bStream);
        return Base64.encodeToString(bStream.toByteArray(), 0);
    }

    private String getFaceToken(Response response) throws JSONException {
        if(response.getStatus() != 200){
            return new String(response.getContent());
        }
        String res = new String(response.getContent());
        Log.e("response", res);
        JSONObject json = new JSONObject(res);
        String faceToken = json.optJSONArray("faces").optJSONObject(0).optString("face_token");
        return faceToken;
    }

    private String creatFaceTokens(ArrayList<String> faceTokens){
        if(faceTokens == null || faceTokens.size() == 0){
            return "";
        }
        StringBuffer face = new StringBuffer();
        for (int i = 0; i < faceTokens.size(); i++){
            if(i == 0){
                face.append(faceTokens.get(i));
            }else{
                face.append(",");
                face.append(faceTokens.get(i));
            }
        }
        return face.toString();
    }
}

其中key 和 secret 可自行注册填入。本项目之前已经创建了faceSet,创建过程可参考：https://download.csdn.net/download/qq_36726507/10293566

注意：uid 不超过255个字符，不能包括^@,&=*'"，不可使用中文（用中文挂掉好几次）。

 项目地址：https://download.csdn.net/download/qq_36726507/10293600