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