前言

最近在写一个人脸识别的小练习，现在记录一下

一、人脸检测是什么？

从手机照片获取一张人脸照片，进行检测，调用百度ai人脸检测接口。

二、使用步骤

1.引入库

代码如下（示例）：

 implementation 'com.orhanobut:hawk:2.0.1'//数据存储//图片加载框架implementation 'com.github.bumptech.glide:glide:4.11.0'implementation 'com.github.bumptech.glide:compiler:4.11.0'implementation 'com.squareup.retrofit2:converter-gson:2.9.0'implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'implementation 'io.reactivex.rxjava2:rxjava:2.2.12'implementation 'com.squareup.retrofit2:retrofit:2.9.0'implementation("androidx.lifecycle:lifecycle-viewmodel-ktx:2.4.1")implementation("androidx.fragment:fragment-ktx:1.4.1")

2.分包操作

项目包名如图所示：

3.添加自定义MyApplication

在application中添加一个类名为MyApplication的类

public class MyApplication extends Application {static Context context;@Overridepublic void onCreate() {super.onCreate();context = getApplicationContext();Hawk.init(this).build();//初始化NetworkApi.init(new NetworkRequiredInfo(this));}public static synchronized MyApplication context() {return (MyApplication) context;}/***Show Toast  简单封装*/public static void showToastLong(String msg) {showToast(context, msg, Toast.LENGTH_LONG);}public static void showToastShort(String msg) {showToast(context, msg, Toast.LENGTH_SHORT);}public static void showToastShort(int strRes) {showToast(context, context.getString(strRes), Toast.LENGTH_SHORT);}public static void showToast(String msg) {showToast(context, msg, Toast.LENGTH_SHORT);}public static void showToast(int strRes) {showToast(context, context.getString(strRes), Toast.LENGTH_SHORT);}public static void showToastLong(int strRes) {showToast(context, context.getString(strRes), Toast.LENGTH_LONG);}public static void showToast(Context context, String msg, int duration) {Toast.makeText(context, msg, duration).show();}
}

4.NetworkRequiredInfo

在application中添加一个类名为NetworkRequiredInfo 的类

public class NetworkRequiredInfo implements INetworkRequiredInfo {private Application application;public NetworkRequiredInfo(Application application){this.application = application;}/*** 版本名*/@Overridepublic String getAppVersionName() {return "1";}/*** 版本号*/@Overridepublic String getAppVersionCode() {return "1.0";}/*** 是否为debug*/@Overridepublic boolean isDebug() {return BuildConfig.DEBUG;}/*** 应用全局上下文*/@Overridepublic Application getApplicationContext() {return application;}
}

5.AppContext

在application中添加一个类名为AppContext的类

public class AppContext extends MyApplication {private static AppContext instance;@Overridepublic void onCreate() {super.onCreate();instance = this;}/*** 获得当前app运行的AppContext*/public static AppContext getInstance() {return instance;}/*** ResponseBody 处理成 Json*/public static String doJson(ResponseBody responseBody) {long contentLength = responseBody.contentLength();BufferedSource source = responseBody.source();try {source.request(Long.MAX_VALUE); // Buffer the entire body.} catch (IOException e) {e.printStackTrace();}Buffer buffer = source.buffer();Charset charset = UTF8;MediaType contentType = responseBody.contentType();if (contentType != null) {try {charset = contentType.charset(UTF8);} catch (UnsupportedCharsetException e) {e.printStackTrace();}}String result = "";// 拦截器，if (contentLength != 0) {result = buffer.clone().readString(charset);//            Log.e("MainActivity", " doJson====>:" + result);}return result;}private static final Charset UTF8 = Charset.forName("UTF-8");/**** 将指定路径的图片转uri* @param context* @param path ，指定图片(或文件)的路径* @return*/
@SuppressLint("Range") public static Uri getMediaUriFromPath(Context context, String path) {Uri mediaUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;Cursor cursor = context.getContentResolver().query(mediaUri,null,MediaStore.Images.Media.DISPLAY_NAME + "= ?",new String[] { path.substring(path.lastIndexOf("/") + 1) },null);Uri uri = null;if (cursor.moveToFirst()) {uri = ContentUris.withAppendedId(mediaUri,cursor.getLong(cursor.getColumnIndex(MediaStore.Images.Media._ID)));}cursor.close();return uri;}/*** 将相册uri转换成url*/public static String getRealPathFromURI(Context context, Uri contentURI) {String result;Cursor cursor = context.getContentResolver().query(contentURI,new String[] { MediaStore.Images.ImageColumns.DATA },//null, null, null);if (cursor == null) { result = contentURI.getPath(); } else {cursor.moveToFirst();int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);result = cursor.getString(index);cursor.close();}return result;}/*** 将拍照的图片保存到系统相册*/public static String saveImageToGallery(Context context, Bitmap bmp) {String fileName = "zhengfutanfang" + ".jpg";//检查有没有存储权限if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {AppContext.showToast("请至权限中心打开应用权限");return "saveError";} else {// 新建目录appDir，并把图片存到其下File appDir = new File(context.getExternalFilesDir(null).getPath() + "BarcodeBitmap");if (!appDir.exists()) {appDir.mkdir();}File file = new File(appDir, fileName);try {FileOutputStream fos = new FileOutputStream(file);bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);fos.flush();fos.close();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}// 把file里面的图片插入到系统相册中try {MediaStore.Images.Media.insertImage(context.getContentResolver(),file.getAbsolutePath(), fileName, null);} catch (FileNotFoundException e) {e.printStackTrace();}// 通知相册更新context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.fromFile(file)));return context.getExternalFilesDir(null).getPath() + "BarcodeBitmap/" + fileName;}}
}

5.ApiService接口类

在service包中添加一个ApiService接口类

public interface ApiService {public static String mBaseUrl = "http://10.0.2.2:8080/web-lesson3-demo/";//获取验证码@GET("api/validate-code")Observable<CodeBean> getCodePicture();@GET("api/validate-code")Observable<ResponseBody> getCodePicture2();//登录接口@POST("api/login")Observable<ResponseBody> loginApi(@Body RequestBody body);//识别脸部照片@POST("api/ai-face")@MultipartObservable<ResponseBody> uploadFacePhoto2(@Part MultipartBody.Part part, @Part("token") RequestBody token);//识别脸部照片@POST("api/ai-face")@MultipartObservable<FaceBean> uploadFacePhoto(@Part MultipartBody.Part part, @Part("token") RequestBody token);}

人脸识别activity


public class FaceDetectionActivity extends BaseActivity<ActivityFaceDetectionBinding> {private static final int REQUEST_CODE = 10000;//权限private static final int TAKE_PHOTO = 11;// 拍照private static final int LOCAL_CROP = 13;// 本地图库public final String TAG = this.getClass().getSimpleName();String currentFileUrl = "";private FaceAdapter faceAdapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);faceAdapter = new FaceAdapter(this);//android版本在6.0以上if (Build.VERSION.SDK_INT >= 23) {System.out.println("版本正确");checkPermission();} else {System.out.println("版本过低");}binding.btnChoosePicture.setOnClickListener(view -> getPhoto());binding.btnIdentifyPicture.setOnClickListener(view -> identifyFacePhoto());binding.btnFaceLogout.setOnClickListener(view -> LogoutUser());binding.ivFacepicture.setOnClickListener(view -> getPhoto());}private void LogoutUser() {Hawk.delete("token");Intent intent = new Intent(FaceDetectionActivity.this, LoginActivity.class);startActivity(intent);}//获取人脸照片private void getPhoto() {CharSequence[] items = { "拍照", "图库" };// 裁剪items选项// 弹出对话框提示用户拍照或者是通过本地图库选择图片new AlertDialog.Builder(this).setItems(items, new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {switch (which) {// 选择了拍照case 0:Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);startActivityForResult(intent, TAKE_PHOTO);break;// 调用系统图库case 1:// 创建Intent，用于打开手机本地图库选择图片Intent intent1 = new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);// 启动intent打开本地图库startActivityForResult(intent1, LOCAL_CROP);break;}}}).show();}/*** 调用startActivityForResult方法启动一个intent后，* 可以在该方法中拿到返回的数据*/@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);switch (requestCode) {case TAKE_PHOTO:// 拍照if (resultCode == RESULT_OK) {final Bitmap photo = data.getParcelableExtra("data");//将bitmap照片放入系统相册，并将照片给urlcurrentFileUrl = AppContext.saveImageToGallery(this, photo);binding.ivFacepicture.setImageBitmap(photo);Log.d(TAG, "onActivityResult: " + currentFileUrl);}break;case LOCAL_CROP:// 系统图库if (resultCode == RESULT_OK) {Uri uri = data.getData();binding.ivFacepicture.setImageURI(uri);currentFileUrl = AppContext.getRealPathFromURI(this, uri);Log.d(TAG, "onActivityResult: " + currentFileUrl);}break;}}private void identifyFacePhoto() {if (TextUtils.isEmpty(currentFileUrl)) {AppContext.showToast("请先选择人脸照片");return;} else {binding.progressBar.setVisibility(View.VISIBLE);File file = new File(currentFileUrl);MultipartBody.Part part = MultipartBody.Part.createFormData("image",file.getName(),RequestBody.create(MediaType.parse("image/*"),file));RequestBody body = RequestBody.create(MediaType.parse("text/plain"), "" + Hawk.get("token"));NetworkApi.createService(ApiService.class).uploadFacePhoto2(part, body).compose(NetworkApi.applySchedulers(new BaseObserver<ResponseBody>() {@Override public void onSuccess(ResponseBody responseBody) {String result = AppContext.doJson(responseBody);String face_list = null;FaceBean.ResultBean faceListBean = null;try {JSONObject jsonObject = new JSONObject(result);face_list = jsonObject.getString("result");KLog.d(TAG, face_list);Gson gson = new Gson();faceListBean = gson.fromJson(String.valueOf(new JSONObject(face_list)), FaceBean.ResultBean.class);} catch (JSONException e) {e.printStackTrace();}if (faceListBean != null) {showListFace(faceListBean);// binding.tvIdentifyFaceRusult.setText(AppContext.doJson(responseBody));} else {AppContext.showToast("识别返回接口数据为空");KLog.d(TAG, "识别返回接口数据为空");binding.progressBar.setVisibility(View.GONE);}}@Override public void onFailure(Throwable e) {binding.progressBar.setVisibility(View.GONE);KLog.d(TAG, e.toString());AppContext.showToast("访问失败");}}));}}//测试了一下//展示泪飙private void showListFace(FaceBean.ResultBean faceListBean) {LinearLayoutManager layoutManager = new LinearLayoutManager(this);layoutManager.setOrientation(LinearLayoutManager.VERTICAL);binding.ryFacePeople.setLayoutManager(layoutManager);binding.ryFacePeople.setAdapter(faceAdapter);binding.progressBar.setVisibility(View.GONE);faceAdapter.updateFaceList(faceListBean.getFace_list());}private void checkPermission() {ActivityCompat.requestPermissions(FaceDetectionActivity.this,new String[] { Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE },REQUEST_CODE);}@Overridepublic void onRequestPermissionsResult(int requestCode,String permissions[], int[] grantResults) {super.onRequestPermissionsResult(requestCode, permissions, grantResults);switch (requestCode) {//权限的申请结果返回case REQUEST_CODE: {if (grantResults.length > 0&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {//已授权AppContext.showToast("授权成功");} else {//未授权AppContext.showToast("授权被拒绝");}}}}@Override public void onBackPressed() {super.onBackPressed();finish();}
}

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调用百度ai人脸检测接口

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