基于Android移动开发集成face++人脸识别的实现

**基于Android移动开发集成face++人脸识别的实现** ## 1.项目简介 “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：  ## 2.页面布局 layout/activity_main.xml界面布局代码如下： ```xml <?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> ``` ## 3.主要代码 MainActivity.java逻辑代码如下： ```java 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(),