Android移动开发-在Android项目里集成face++人脸识别的实现

“人工智能”是今年比较火的一个名词，甚至大多数人认为“人工智能”是继“IT互联网”之后一个新的浪潮，将会是本世纪最高科技的水准。个人觉得，目前国内语音识别做的比较好的是科大讯飞，图像识别（或人脸识别）做的比较好的是face++（旷视）。

那么，如何在Android项目里集成face++人脸识别的实现呢？
首先在face++的开发平台网址：https://www.faceplusplus.com.cn/ ，然后在平台注册成为开发者后在点击“应用管理”——创建“API Key”号，如下图所示：

接着再绑定Bundle ID号，如下图所示：

• layout/activity_main.xml界面布局代码如下：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout 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=".MainActivity">    <ImageView        android:id="@+id/id_photo"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_alignParentLeft="true"        android:layout_alignParentRight="true"        android:layout_alignParentTop="true"        android:layout_alignTop="@+id/id_detect"        android:src="@drawable/face" />    <TextView        android:id="@+id/id_tip"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:layout_alignTop="@+id/id_detect"        android:layout_marginRight="10dp"        android:layout_toLeftOf="@+id/id_detect"        android:gravity="center"        android:text="tip" />    <Button        android:id="@+id/id_detect"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:layout_marginRight="10dip"        android:layout_toLeftOf="@+id/id_getImg"        android:text="检测人脸" />    <Button        android:id="@+id/id_getImg"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:layout_alignParentRight="true"        android:layout_marginRight="10dp"        android:text="选择图片" />    <FrameLayout        android:id="@+id/id_waiting"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:clickable="true"        android:visibility="gone">        <ProgressBar            android:id="@+id/id_progressBar"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_gravity="center" />        <TextView            android:id="@+id/id_age_and_gender"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:background="@drawable/hint"            android:drawableLeft="@drawable/male"            android:gravity="center"            android:text="123"            android:textColor="#ffff00ff"            android:textSize="22sp"            android:visibility="invisible" />    </FrameLayout></RelativeLayout>

• MainActivity.java逻辑代码如下：

package com.fukaimei.facerecognition;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;import com.facepp.error.FaceppParseException;import com.fukaimei.facerecognition.utils.FaceppDetect;import android.content.Intent;import android.content.pm.PackageManager;import android.database.Cursor;import android.graphics.Bitmap;import android.graphics.BitmapFactory;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.support.annotation.NonNull;import android.support.v4.app.ActivityCompat;import android.support.v4.content.ContextCompat;import android.support.v7.app.AppCompatActivity;import android.text.TextUtils;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends AppCompatActivity implements OnClickListener {    private ImageView mPhoto;    private Button mDetect, mGetImg;    private TextView mTip;    private View mWaiting;    private Canvas canvas;    private Paint mPaint;    private String mCurrentPhotoStr;    private Bitmap mBitmapPhoto;    private static final int PICK_CODE = 0x110;    private static final int MSG_SUCCESS = 0x111;    private static final int MSG_ERROR = 0x112;    private Handler mHandler = new Handler() {        public void handleMessage(android.os.Message msg) {            switch (msg.what) {                case MSG_SUCCESS:                    mWaiting.setVisibility(View.GONE);                    JSONObject rs = (JSONObject) msg.obj;                    prepareResultBitmap(rs);                    mPhoto.setImageBitmap(mBitmapPhoto);                    break;                case MSG_ERROR:                    mWaiting.setVisibility(View.GONE);                    String errorMsg = (String) msg.obj;                    if (TextUtils.isEmpty(errorMsg)) {                        mTip.setText("Error.");                    } else {                        mTip.setText(errorMsg);                    }                    break;            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        // 申请访问SD卡的动态权限        sdPermissions();        mPhoto = (ImageView) findViewById(R.id.id_photo);        mDetect = (Button) findViewById(R.id.id_detect);        mGetImg = (Button) findViewById(R.id.id_getImg);        mTip = (TextView) findViewById(R.id.id_tip);        mWaiting = findViewById(R.id.id_waiting);        mDetect.setOnClickListener(this);        mGetImg.setOnClickListener(this);        mPaint = new Paint();    }    // 定义访问SD卡的动态权限    private void sdPermissions() {        if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.READ_EXTERNAL_STORAGE)                != PackageManager.PERMISSION_GRANTED) {            ActivityCompat.requestPermissions(this, new String[]{                    android.Manifest.permission.READ_EXTERNAL_STORAGE}, 1);        }    }    /**     * 重写onRequestPermissionsResult方法     * 获取动态权限请求的结果,再访问SD卡     */    @Override    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {        if (requestCode == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {        } else {            Toast.makeText(this, "用户拒绝了权限", Toast.LENGTH_SHORT).show();        }        super.onRequestPermissionsResult(requestCode, permissions, grantResults);    }    private void prepareResultBitmap(JSONObject rs) {        // TODO Auto-generated method stub        Bitmap bitmap = Bitmap.createBitmap(mBitmapPhoto.getWidth(), mBitmapPhoto.getHeight(),                mBitmapPhoto.getConfig());        canvas = new Canvas(bitmap);        canvas.drawBitmap(mBitmapPhoto, 0, 0, null);        try {            JSONArray faces = rs.getJSONArray("face");            int faceCount = faces.length();            mTip.setText("find " + faceCount);            for (int i = 0; i < faceCount; i++) {                // 拿到单独face对象                JSONObject face = faces.getJSONObject(i);                JSONObject positonObj = face.getJSONObject("position");                // get face position                float x = (float) positonObj.getJSONObject("center").getDouble("x");                float y = (float) positonObj.getJSONObject("center").getDouble("y");                float w = (float) positonObj.getDouble("width");                float h = (float) positonObj.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);                mPaint.setStrokeWidth(3);                // draw box                canvas.drawLine(x - w / 2, y - h / 2, x - w / 2, y + h / 2, mPaint);// 左                canvas.drawLine(x - w / 2, y + h / 2, x + w / 2, y + h / 2, mPaint);// 下                canvas.drawLine(x + w / 2, y + h / 2, x + w / 2, y - h / 2, mPaint);// 右                canvas.drawLine(x - w / 2, y - h / 2, x + w / 2, y - h / 2, mPaint);// 上                // get age and gender                int age = face.getJSONObject("attribute").getJSONObject("age").getInt("value");                String gender = face.getJSONObject("attribute").getJSONObject("gender").getString("value");                Bitmap ageBitmap = buildAgeBitmap(age, gender.equals("Male"));                int ageWidth = ageBitmap.getWidth();                int ageHeight = ageBitmap.getHeight();                if(bitmap.getWidth()<=mPhoto.getWidth() && bitmap.getHeight()<=mPhoto.getHeight()){                    float ratio = Math.max(bitmap.getWidth() * 1.0f / mPhoto.getWidth(),                            bitmap.getHeight() * 1.0f / mPhoto.getHeight());                    ageBitmap = Bitmap.createScaledBitmap(ageBitmap, (int) (ageWidth * ratio),                            (int) (ageHeight * ratio), false);                    canvas.drawBitmap(ageBitmap, x - ageBitmap.getWidth() / 2, y - h / 2 - ageBitmap.getHeight(), null);                }                mBitmapPhoto = bitmap;            }        } catch (JSONException e) {            e.printStackTrace();        }    };    private Bitmap buildAgeBitmap(int age, boolean isMale) {        TextView tv = (TextView) mWaiting.findViewById(R.id.id_age_and_gender);        tv.setText(age + "");        if (isMale) {            tv.setCompoundDrawablesWithIntrinsicBounds(getResources().getDrawable(R.drawable.male), null, null, null);        } else {            tv.setCompoundDrawablesWithIntrinsicBounds(getResources().getDrawable(R.drawable.female), null, null, null);        }        tv.setDrawingCacheEnabled(true);        Bitmap bitmap = Bitmap.createBitmap(tv.getDrawingCache());        tv.destroyDrawingCache();        return bitmap;    }    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        if (requestCode == PICK_CODE) {            if (data != null) {                Uri uri = data.getData();                Cursor cursor = getContentResolver().query(uri, null, null, null, null);                cursor.moveToFirst();                int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);                mCurrentPhotoStr = cursor.getString(index);                cursor.close();                resizePhoto();                mPhoto.setImageBitmap(mBitmapPhoto);                mTip.setText("点击检测 ==>");            }        }        super.onActivityResult(requestCode, resultCode, data);    }    private void resizePhoto() {        BitmapFactory.Options options = new BitmapFactory.Options();        options.inJustDecodeBounds = true;        BitmapFactory.decodeFile(mCurrentPhotoStr, options);        double ratio = Math.max(options.outWidth * 1.0d / 1024f, options.outHeight * 1.0d / 1024f);        options.inSampleSize = (int) Math.ceil(ratio);        options.inJustDecodeBounds = false;        mBitmapPhoto = BitmapFactory.decodeFile(mCurrentPhotoStr, options);    }    @Override    public void onClick(View v) {        switch (v.getId()) {            case R.id.id_getImg:                Intent intent = new Intent(Intent.ACTION_PICK);                intent.setType("image/*");                startActivityForResult(intent, PICK_CODE);                break;            case R.id.id_detect:                if (mBitmapPhoto != null && !mBitmapPhoto.isRecycled()) {                    mWaiting.setVisibility(View.VISIBLE);                    FaceppDetect.detect(mBitmapPhoto, new FaceppDetect.CallBack() {                        @Override                        public void success(JSONObject result) {                            Message msg = mHandler.obtainMessage(MSG_SUCCESS);                            msg.obj = result;                            msg.sendToTarget();                        }                        @Override                        public void error(FaceppParseException exception) {                            Message msg = mHandler.obtainMessage(MSG_ERROR);                            msg.obj = exception.getErrorMessage();                            msg.sendToTarget();                        }                    });                } else {                    Toast.makeText(MainActivity.this, "请选择您要检测的人脸图片", Toast.LENGTH_SHORT).show();                }                break;        }    }}

• 然后在 Constant.java逻辑代码下添加在face++平台申请到的APP_KEY码和APP_SECRET码如下：

package com.fukaimei.facerecognition;public class Constant {    public static final String APP_KEY = "填写你申请到的APP_KEY码";    public static final String APP_SECRET = "填写你申请到的APP_SECRET码";}

• Demo程序运行效果界面截图如下：

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Demo程序源码下载地址一（GitHub）
Demo程序源码下载地址二（Gitee）