使用face++的API接口-人脸识别

本文地址：http://blog.csdn.net/tiandixuanwuliang/article/details/78018687

本文将介绍如何使用face++的API接口实现人脸识别。

一、获取face++的API支持

1.1face++官网：https://www.faceplusplus.com.cn/

1.2在face++官网上注册账号，填写开发者资料，如下图：

二、创建API Key和绑定Bundle ID

2.1在如下图位置，点击API Key

2.2点击创建API key,按照要求填写（选择试用）：

2.3绑定应用程序：

至此，我们的准备工作就做好了。我们将会使用API Key和API Secret。

三、创建Android工程

3.1建立Android项目。本文使用Fragment+Activity模式，Activity代码是简单的fragment，如下

package com.wllfengshu.boyandgirl;import android.annotation.SuppressLint;import android.app.Activity;import android.app.FragmentManager;import android.app.FragmentTransaction;import android.os.Bundle;import android.view.View;public class MainActivity extends Activity {private FragmentManager fm;private FragmentTransaction transaction;@SuppressLint("NewApi")@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);fm = getFragmentManager();transaction = fm.beginTransaction();transaction.replace(R.id.ll_fregment, new FaceFragment());transaction.commit();}public void change(View v) {transaction = fm.beginTransaction();switch (v.getId()) {case R.id.ib_main_face:transaction.replace(R.id.ll_fregment, new FaceFragment());break;case R.id.ib_main_gesture:transaction.replace(R.id.ll_fregment, new GestureFragment());break;case R.id.ib_main_other:transaction.replace(R.id.ll_fregment, new OtherFragment());break;}transaction.commit();}}
3.2fragment代码如下：（其中封装的函数会在下文中介绍）
package com.wllfengshu.boyandgirl;import java.io.IOException;import java.util.HashMap;import java.util.List;import java.util.Map;import org.json.JSONException;import org.json.JSONObject;import android.annotation.SuppressLint;import android.app.Fragment;import android.content.Intent;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Paint;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.Button;import android.widget.ImageView;import android.widget.TextView;import android.widget.Toast;import com.wllfengshu.util.Constant;import com.wllfengshu.util.DrawUtil;import com.wllfengshu.util.GifView;import com.wllfengshu.util.HttpUtils;import com.wllfengshu.util.ImageUtil;@SuppressLint({ "NewApi", "HandlerLeak" })public class FaceFragment extends Fragment implements OnClickListener {private ImageView iv_face;// 锟矫伙拷选锟斤拷锟酵计�private Button ib_face_enter;// 确锟斤拷锟斤拷钮private Button ib_face_choice;// 选锟斤拷图片锟斤拷钮锟斤拷锟斤拷图锟解）private TextView tv_face_gender;private TextView tv_face_age;private TextView tv_face_beauty;private Bitmap scalingPhoto;// 位图private String gender;// 性别private int age;// 年龄private int beauty;// 颜值private Paint paint;// 画笔工具private View view;private GifView gif;@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {view = inflater.inflate(R.layout.fragment_face, container, false);iv_face = (ImageView) view.findViewById(R.id.iv_face);ib_face_enter = (Button) view.findViewById(R.id.ib_face_enter);ib_face_choice = (Button) view.findViewById(R.id.ib_face_choice);tv_face_gender = (TextView) view.findViewById(R.id.tv_face_gender);tv_face_age = (TextView) view.findViewById(R.id.tv_face_age);tv_face_beauty = (TextView) view.findViewById(R.id.tv_face_beauty);gif = (GifView) view.findViewById(R.id.gif);ib_face_enter.setOnClickListener(this);ib_face_choice.setOnClickListener(this);paint = new Paint();// 创建画笔scalingPhoto = BitmapFactory.decodeResource(this.getResources(),R.drawable.defualt);return view;}@SuppressLint("HandlerLeak")private Handler handler = new Handler() {@Overridepublic void handleMessage(Message msg) {String str = (String) msg.obj;System.out.println("*******face:" + str);if (str.equals("403") || str.equals("400") || str.equals("413")|| str.equals("500")) {Toast.makeText(getActivity(), "Please Try Again",Toast.LENGTH_SHORT).show();} else {try {JSONObject resultJSON = new JSONObject(str);System.out.println(resultJSON.getString("faces") + "=====");if (resultJSON.getString("faces").equals("[]")) {Toast.makeText(getActivity(),"There is no face picture", Toast.LENGTH_SHORT).show();} else {@SuppressWarnings("rawtypes")List res = DrawUtil.FacePrepareBitmap(resultJSON,scalingPhoto, paint, iv_face);gender = (String) res.get(0);age = (Integer) res.get(1);beauty = (Integer) res.get(2);System.out.println("------------" + gender + " " + age+ " " + " " + beauty);tv_face_gender.setText("性别:"+ ImageUtil.getFaceGender(gender));tv_face_age.setText("年龄:" + age);tv_face_beauty.setText("颜值:" + beauty);}} catch (JSONException e) {e.printStackTrace();}}gif.setVisibility(View.GONE);// 停止gif};};@Overridepublic void onActivityResult(int requestCode, int resultCode, Intent data) {if (requestCode == 1) {// 锟矫伙拷选锟斤拷锟酵计拷锟斤拷锟斤拷锟斤拷荽锟斤拷锟絛ata锟斤拷if (data != null) {// 锟矫碉拷图片锟斤拷路锟斤拷String photoPath = ImageUtil.getPhotoPath(getActivity(), data);// 锟斤拷锟斤拷scalingPhoto = ImageUtil.getScalingPhoto(photoPath);// 锟斤拷示图片iv_face.setImageBitmap(scalingPhoto);}}super.onActivityResult(requestCode, resultCode, data);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.ib_face_choice:// 锟斤拷图锟斤拷Intent intent = new Intent();intent.setAction(Intent.ACTION_PICK);intent.setType("image/*");startActivityForResult(intent, 1);// 通锟斤拷氐锟斤拷蚩锟斤拷锟�break;case R.id.ib_face_enter:// 显示加载动画gif.setVisibility(View.VISIBLE);gif.setMovieResource(R.raw.red); // 设置背景gif图片资源String base64ImageEncode = ImageUtil.getBase64ImageEncode(scalingPhoto);System.out.println(base64ImageEncode);// 锟斤拷装锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟�final Map<String, Object> map = new HashMap<String, Object>();map.put("api_key", Constant.API_KEY);map.put("api_secret", Constant.API_SECRET);map.put("return_attributes", "gender,age,beauty");map.put("image_base64", base64ImageEncode);// 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷new Thread(new Runnable() {@Overridepublic void run() {try {String result = HttpUtils.post(Constant.URL_DETECT, map);Message message = new Message();message.obj = result;handler.sendMessage(message);} catch (IOException e) {e.printStackTrace();}}}).start();break;}}} 
上面代码说明：fragment页面中包含两个按钮,一个按钮点击“打开手机图库”，一个按钮点击“确认”。用户点击确认后，开始把用户选择的人脸图片通过POST请求方式发送到face++服务器，等待获取人脸特征的数据。
其中封装的POST请求代码如下：
public static String post(String url, Map<String, Object> args) throws IOException {URL host = new URL(url);HttpURLConnection connection = HttpURLConnection.class.cast(host.openConnection());connection.setRequestMethod("POST");connection.setDoOutput(true);connection.setDoInput(true);connection.setUseCaches(false);connection.setRequestProperty("Connection", "Keep-Alive");connection.setRequestProperty("Charsert", "UTF-8");DataOutputStream dos = new DataOutputStream(connection.getOutputStream());if (args != null) {for (Entry<String, Object> entry : args.entrySet()) {String key = entry.getKey(); Object value = entry.getValue();if (value instanceof File) {value = new FileInputStream(File.class.cast(value));}if (value instanceof InputStream) {dos.write((key + "=").getBytes());InputStream is = InputStream.class.cast(value);byte[] data = new byte[is.available()];is.read(data);dos.write(URLEncoder.encode(Base64.encodeToString(data, data.length), "UTF-8").getBytes());is.close();} else { dos.write((key + "=" + URLEncoder.encode(String.valueOf(value), "UTF-8")).getBytes());}dos.write("&".getBytes());}}dos.flush();dos.close();int resultCode = connection.getResponseCode();StringBuilder response = new StringBuilder();if (resultCode == HttpURLConnection.HTTP_OK) {BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));String line;while ((line = br.readLine()) != null) {response.append(line);}br.close();} else {response.append(resultCode);}return response.toString();}
本文采用把图片转换为base64格式进行传输，其代码如下：
public static String getBase64ImageEncode(Bitmap myImage) {Bitmap bmSmall = Bitmap.createBitmap(myImage, 0, 0, myImage.getWidth(), myImage.getHeight());ByteArrayOutputStream stream = new ByteArrayOutputStream();bmSmall.compress(Bitmap.CompressFormat.JPEG, 100, stream);byte[] arrays = stream.toByteArray();// base64 encodebyte[] encode = Base64.encode(arrays, Base64.DEFAULT);String base64Encode = new String(encode);return base64Encode;}
界面布局文件代码（activity_main.xml文件）：
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="@drawable/bg" >    <LinearLayout        android:id="@+id/ll_fregment"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:orientation="vertical" >    </LinearLayout>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:orientation="horizontal" >        <RadioGroup            android:layout_width="match_parent"            android:layout_height="50dp"            android:orientation="horizontal" >            <RadioButton                android:id="@+id/ib_main_face"                android:layout_width="match_parent"                android:layout_height="match_parent"                android:layout_weight="1"                android:background="@drawable/rb_select"                android:button="@null"                android:checked="true"                android:gravity="center"                android:onClick="change"                android:text="人脸识别" />            <RadioButton                android:id="@+id/ib_main_gesture"                android:layout_width="match_parent"                android:layout_height="match_parent"                android:layout_weight="1"                android:background="@drawable/rb_select"                android:button="@null"                android:gravity="center"                android:onClick="change"                android:text="手势识别" />            <RadioButton                android:id="@+id/ib_main_other"                android:layout_width="match_parent"                android:layout_height="match_parent"                android:layout_weight="1"                android:background="@drawable/rb_select"                android:button="@null"                android:gravity="center"                android:onClick="change"                android:text="其他功能" />                    </RadioGroup>    </LinearLayout></RelativeLayout>
人脸识别界面代码：
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent" ><TextView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:gravity="center"        android:text="人脸识别"        android:textSize="20sp" />    <ImageView        android:id="@+id/iv_face"        android:layout_width="200dp"        android:layout_height="300dp"        android:layout_alignParentTop="true"        android:layout_centerHorizontal="true"        android:contentDescription="人脸图片"        android:paddingTop="40dp"        android:src="@drawable/defualt" />    <LinearLayout        android:id="@+id/ll_button"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_below="@id/iv_face"        android:layout_marginLeft="10dp"        android:layout_marginRight="10dp"        android:gravity="center_horizontal"        android:orientation="horizontal" >        <Button            android:id="@+id/ib_face_enter"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:background="@drawable/enter"            android:text="确定" />        <Button            android:id="@+id/ib_face_choice"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:background="@drawable/choose"            android:text="选择图片" />    </LinearLayout>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:layout_below="@id/ll_button"        android:orientation="horizontal"        android:paddingTop="20dp" >        <TextView            android:id="@+id/tv_face_gender"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_weight="1"            android:gravity="center"            android:src="@drawable/ic_launcher"            android:text="性别"            android:textSize="20sp" />        <TextView            android:id="@+id/tv_face_age"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_weight="1"            android:gravity="center"            android:src="@drawable/ic_launcher"            android:text="年龄"            android:textSize="20sp" />        <TextView            android:id="@+id/tv_face_beauty"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_weight="1"            android:gravity="center"            android:src="@drawable/ic_launcher"            android:text="颜值"            android:textSize="20sp" />    </LinearLayout>    <com.wllfengshu.util.GifView        android:id="@+id/gif"        android:layout_width="200dp"        android:layout_height="200dp"        android:layout_centerHorizontal="true"        android:layout_gravity="center_horizontal"        android:layout_marginTop="60dp"        android:enabled="false" /></RelativeLayout>

人脸识别界面：
本文还有一些其他的封装函数，由于篇幅问题不一一粘贴，请大家自行下载本文代码案例：下载地址：http://download.csdn.net/download/tiandixuanwuliang/9984027