前言：之前配置好Android Studio后，一直在参与课程的两个项目，未能及时更新，最近期末考试，可能又要断更一段时间。今天验收好，跟大家分享一下其中我负责的相机相册调用以及文字识别的部分,大家根据目录选择自己需要的内容。具体项目可能投入使用，所以不方便给项目中的源码，但如下我书写的测试项目运行正常，并能完美实现相关功能！

项目环境：
1、Android Studio 4.1.1

2、华为Nova 3e （安卓9）以及华为 P20（安卓10）
3、百度智能云-文字识别OCR-通用文字识别（高精度版）

项目流程

一、调用手机相机/相册

注意有些部分是文字识别的方法（已注明），如果不需要文字识别功能，则不需要其代码。

1.activity_main.xml和MainActivity.java

1.1activity_main.xml（约束性布局）以及btnef4.xml（波纹按钮）

**activity_main.xml**
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout     xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context="com.example.myapplication.MainActivity"android:background="#13277a"><androidx.constraintlayout.widget.ConstraintLayoutandroid:layout_width="0dp"android:layout_height="0dp"app:layout_constraintWidth_percent="0.8"app:layout_constraintHeight_percent="0.4"android:id="@+id/reportcons1"app:layout_constraintTop_toTopOf="parent"app:layout_constraintBottom_toBottomOf="parent"android:background="@drawable/btnef4"app:layout_constraintLeft_toLeftOf="parent"app:layout_constraintRight_toRightOf="parent"app:layout_constraintVertical_bias="0.3"><TextViewandroid:id="@+id/albumtext1"android:layout_width="match_parent"android:layout_height="0dp"app:layout_constraintHeight_percent="0.2"app:layout_constraintTop_toTopOf="parent"android:text="手写/拍照上传"android:background="#fff"android:textSize="24sp"android:textColor="#13277a"android:gravity="center"/><Buttonandroid:id="@+id/rtake_photo"android:layout_width="0dp"app:layout_constraintWidth_percent="0.8"app:layout_constraintHeight_percent="0.3"android:background="@drawable/btnef4"android:layout_height="wrap_content"app:layout_constraintLeft_toLeftOf="parent"app:layout_constraintRight_toRightOf="parent"app:layout_constraintTop_toTopOf="parent"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintVertical_bias="0.3"android:text="拍照"android:textSize="20dp"android:textColor="#13277a"/><Buttonandroid:id="@+id/choose_from_album"android:layout_width="0dp"app:layout_constraintWidth_percent="0.8"app:layout_constraintHeight_percent="0.3"android:background="@drawable/btnef4"android:layout_height="wrap_content"android:layout_below="@+id/rtake_photo"app:layout_constraintLeft_toLeftOf="parent"app:layout_constraintRight_toRightOf="parent"app:layout_constraintTop_toTopOf="parent"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintVertical_bias="0.7"android:text="相册"android:textSize="20dp"android:textColor="#13277a"/></androidx.constraintlayout.widget.ConstraintLayout>
</androidx.constraintlayout.widget.ConstraintLayout>btnef4.xml
<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"android:color="#BABCBC"> <!--波纹颜色--><item><shape android:shape="rectangle"><solidandroid:color="#fff"/><cornersandroid:radius="10dp"/></shape></item>
</ripple>

1.2.MainActivity.java

package com.example.myapplication;import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;public class MainActivity extends AppCompatActivity {public static final int TAKE_PHOTO = 1;public static final int CHOOSE_PHOTO = 2;private ImageView picture;private Intent intent1,intent2,intent3;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Button chooseFromAlbum = findViewById(R.id.choose_from_album);chooseFromAlbum.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, CHOOSE_PHOTO);} else {openAlbum();//打开album的界面}}});Button takePhoto = findViewById(R.id.rtake_photo);picture = findViewById(R.id.picture);takePhoto.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// 动态申请权限if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CAMERA}, TAKE_PHOTO);} else {// 启动相机程序startCamera();}}});intent1=new Intent(this,Albums.class);//创建跳转到Albums显示的窗口的Intentintent2=new Intent(this,Camera.class);//创建跳转到Camera显示的窗口的Intent}private void openAlbum() {startActivity(intent1);//进入album的窗口界面}private void startCamera() {startActivity(intent2);//进入camera的窗口界面}}

2.albums.xml和Albums.java

2.1.albums.xml（相对布局）

<?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"><Buttonandroid:id="@+id/pictureIdentity2"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginTop="20dp"android:text="文字识别"android:textColor="#FFFFFF"android:background="#13277a"android:gravity="center"android:layout_marginLeft="80dp"android:textSize="20dp" /><Buttonandroid:id="@+id/pictureback2"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginTop="20dp"android:text="返回"android:textColor="#FFFFFF"android:background="#13277a"android:gravity="center"android:layout_marginLeft="220dp"android:textSize="20dp" /><ImageViewandroid:id="@+id/picture"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_below="@+id/pictureIdentity2"android:layout_centerHorizontal="true"android:layout_marginTop="20dp" /></RelativeLayout>

2.2.Albums.java

package com.example.myapplication;import android.Manifest;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.ContentUris;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;import java.net.URLEncoder;public class Albums extends Activity {private  ImageView albumsPicture;public static final int CHOOSE_PHOTO = 2;private Button button1,button2;private String token;private String pathiden;private String resultden;@SuppressLint("HandlerLeak")
Handler handler = new Handler(){@Overridepublic void handleMessage(@NonNull Message msg) {//        resultden =}
};protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.albums);albumsPicture = super.findViewById(R.id.picture);if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, CHOOSE_PHOTO);} else {openAlbum();}/*文字识别部分*/button1=findViewById(R.id.pictureIdentity2);button1.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {new Thread(){@Overridepublic void run() {resultden=accurateBasic(pathiden);if (Build.VERSION.SDK_INT >= 23) {int REQUEST_CODE_CONTACT = 101;String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE};//验证是否许可权限for (String str : permissions) {if (Albums.this.checkSelfPermission(str) != PackageManager.PERMISSION_GRANTED) {//申请权限Albums.this.requestPermissions(permissions, REQUEST_CODE_CONTACT);return;} else {FileLog fileLog=new FileLog();fileLog.saveLog("标题",resultden,"文件名");Toast.makeText(getApplicationContext(),"文档生成成功！",Toast.LENGTH_SHORT).show();}}}}}.start();}});button2=findViewById(R.id.pictureback2);button2.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent=new Intent(v.getContext(),MainActivity.class);startActivity(intent);finish();}});}private void openAlbum() {Intent intent = new Intent("android.intent.action.GET_CONTENT");intent.setType("image/*");startActivityForResult(intent, CHOOSE_PHOTO);//打开相册}// 使用startActivityForResult()方法开启Intent的回调@Overrideprotected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {switch (requestCode) {case CHOOSE_PHOTO://相册照片if (requestCode == CHOOSE_PHOTO && resultCode == RESULT_OK && null != data) {if (Build.VERSION.SDK_INT >= 19) {handleImageOnKitkat(data);} else {handleImageBeforeKitKat(data);}}default:break;}}@TargetApi(19)private void handleImageOnKitkat(Intent data) {String imagePath = null;Uri uri = data.getData();if (DocumentsContract.isDocumentUri(this, uri)) {//如果是document类型的uri，则通过document id处理String docId = DocumentsContract.getDocumentId(uri);if ("com.android.providers.media.documents".equals(uri.getAuthority())) {String id = docId.split(":")[1];String selection = MediaStore.Images.Media._ID + "=" + id;imagePath = getImagePath( MediaStore.Images.Media.EXTERNAL_CONTENT_URI, selection);} else if ("com.android.providers.downloads.documents".equals(uri.getAuthority())) {Uri contentUri = ContentUris.withAppendedId(Uri.parse("content:" +"//downloads/public_downloads"), Long.valueOf(docId));imagePath = getImagePath(contentUri, null);}} else if ("content".equalsIgnoreCase(uri.getScheme())) {//如果是content类型的uri，则使用普通方式处理imagePath = getImagePath(uri, null);} else if ("file".equalsIgnoreCase(uri.getScheme())) {//如果是File类型的uri，直接获取图片路径即可imagePath = uri.getPath();}//根据图片路径显示图片displayImage(imagePath);pathiden=imagePath;}private void handleImageBeforeKitKat(Intent data){Uri uri=data.getData();String imagePath=getImagePath(uri,null);displayImage(imagePath);}private String getImagePath(Uri uri,String selection){String path=null;Cursor cursor=getContentResolver().query(uri,null,selection,null,null);if(cursor!=null){if(cursor.moveToFirst()){path=cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));}cursor.close();}return path;}private void displayImage(String imagePath){if(imagePath!=null){Bitmap bitmap=BitmapFactory.decodeFile(imagePath);albumsPicture.setImageBitmap(bitmap);//将图片放置在控件上}else {Toast.makeText(this,"得到图片失败",Toast.LENGTH_SHORT).show();}}/*识别方法*/public  String accurateBasic(String uripath) {// 请求urlAccessToken accessToken1=new AccessToken();token=accessToken1.getAuth();String url = "https://aip.baidubce.com/rest/2.0/ocr/v1/accurate_basic";try {// 本地文件路径String filePath = uripath;byte[] imgData = FileUtil.readFileByBytes(filePath);String imgStr = Base64Util.encode(imgData);String imgParam = URLEncoder.encode(imgStr, "UTF-8");String param = "image=" + imgParam;// 注意这里仅为了简化编码每一次请求都去获取access_token，线上环境access_token有过期时间， 客户端可自行缓存，过期后重新获取。String accessToken = token;String result = HttpUtil.post(url, accessToken, param);return result;} catch (Exception e) {e.printStackTrace();}return null;}}

3.camera.xml和Camera.java

3.1.camera.xml（相对布局）

<?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"><Buttonandroid:id="@+id/pictureSave"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginTop="20dp"android:text="保存图像"android:textColor="#FFFFFF"android:layout_marginLeft="20dp"android:background="#13277a"android:gravity="center"android:textSize="20dp" /><Buttonandroid:id="@+id/pictureIdentity"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginTop="20dp"android:text="文字识别"android:textColor="#FFFFFF"android:background="#13277a"android:gravity="center"android:layout_marginLeft="140dp"android:textSize="20dp" /><Buttonandroid:id="@+id/pictureback"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginTop="20dp"android:text="返回"android:textColor="#FFFFFF"android:background="#13277a"android:gravity="center"android:layout_toRightOf="@+id/pestDetection"android:layout_marginLeft="260dp"android:textSize="20dp" /><ImageViewandroid:id="@+id/picture"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerHorizontal="true"android:layout_below="@+id/pictureSave"android:layout_marginTop="0dp" /></RelativeLayout>

3.2.Camera.java

package com.example.myapplication;import android.Manifest;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;import androidx.annotation.Nullable;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.core.content.FileProvider;import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URLEncoder;public class Camera extends Activity {private ImageView cameraPicture;public static final int TAKE_PHOTO = 1;private Button pictureSave=null;private Uri imageUri;private String uriden;private String token;private String pathiden;private String resultden;protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.camera);pictureSave=findViewById(R.id.pictureSave);cameraPicture = findViewById(R.id.picture);// 创建一个File对象，用于保存摄像头拍下的图片，这里把图片命名为output_image.jpg// 并将它存放在手机SD卡的应用关联缓存目录下File outputImage = new File(getExternalCacheDir(), "output_image.jpg");// 对照片的更换设置try {// 如果上一次的照片存在，就删除if (outputImage.exists()) {outputImage.delete();}// 创建一个新的文件outputImage.createNewFile();} catch (IOException e) {e.printStackTrace();}// 如果Android版本大于等于7.0if (Build.VERSION.SDK_INT >= 24) {// 将File对象转换成一个封装过的Uri对象imageUri = FileProvider.getUriForFile(this, "com.example.myapplication.fileProvider", outputImage);Log.d("MainActivity", outputImage.toString() + "手机系统版本高于Android7.0");} else {// 将File对象转换为Uri对象，这个Uri标识着output_image.jpg这张图片的本地真实路径Log.d("MainActivity", outputImage.toString() + "手机系统版本低于Android7.0");imageUri = Uri.fromFile(outputImage);}// 动态申请权限if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {ActivityCompat.requestPermissions( this, new String[]{Manifest.permission.CAMERA}, TAKE_PHOTO);} else {// 启动相机程序startCamera();}pictureSave.setOnClickListener(new Camera.pictureSaveFunction());Button button1=findViewById(R.id.pictureback);button1.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent(v.getContext(), MainActivity.class);startActivity(intent);finish();}});/*文字识别*/Button button2=findViewById(R.id.pictureIdentity);button2.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {System.out.println(uriden);new Thread(){@Overridepublic void run() {resultden=accurateBasic(uriden);if (Build.VERSION.SDK_INT >= 23) {int REQUEST_CODE_CONTACT = 101;String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE};//验证是否许可权限for (String str : permissions) {if (Camera.this.checkSelfPermission(str) != PackageManager.PERMISSION_GRANTED) {//申请权限Camera.this.requestPermissions(permissions, REQUEST_CODE_CONTACT);return;} else {FileLog fileLog=new FileLog();fileLog.saveLog("标题",resultden,"文件名");Toast.makeText(getApplicationContext(),"文档生成成功！",Toast.LENGTH_SHORT).show();}}}}}.start();System.out.println(resultden);}});}private void startCamera() {Intent intent4 = new Intent("android.media.action.IMAGE_CAPTURE");// 指定图片的输出地址为imageUriintent4.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);startActivityForResult(intent4, TAKE_PHOTO);}private class pictureSaveFunction implements View.OnClickListener {public void onClick(View view){BitmapDrawable bmpDrawable = (BitmapDrawable) cameraPicture.getDrawable();Bitmap bitmap = bmpDrawable.getBitmap();saveToSystemGallery(bitmap);//将图片保存到本地Toast.makeText(getApplicationContext(),"图片保存成功！",Toast.LENGTH_SHORT).show();}}@Overrideprotected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {switch (requestCode) {case TAKE_PHOTO:if (requestCode == TAKE_PHOTO && resultCode == RESULT_OK ) {try {// 将图片解析成Bitmap对象Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));cameraPicture.setImageBitmap(bitmap);} catch (FileNotFoundException e) {e.printStackTrace();}}break;default:break;}}public void saveToSystemGallery(Bitmap bmp) {// 首先保存图片File appDir = new File(Environment.getExternalStorageDirectory(), "cinema");if (!appDir.exists()) {appDir.mkdir();}String fileName = System.currentTimeMillis() + ".jpg";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();}// 其次把文件插入到系统图库try {MediaStore.Images.Media.insertImage(getContentResolver(),file.getAbsolutePath(), fileName, null);} catch (FileNotFoundException e) {e.printStackTrace();}//sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse(file.getAbsolutePath())));Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);Uri uri = Uri.fromFile(file);intent.setData(uri);sendBroadcast(intent);// 发送广播，通知图库更新uriden=uri.getPath();}/*识别方法*/public  String accurateBasic(String uripath) {// 请求urlAccessToken accessToken1=new AccessToken();token=accessToken1.getAuth();String url = "https://aip.baidubce.com/rest/2.0/ocr/v1/accurate_basic";try {// 本地文件路径String filePath = uripath;byte[] imgData = FileUtil.readFileByBytes(filePath);String imgStr = Base64Util.encode(imgData);String imgParam = URLEncoder.encode(imgStr, "UTF-8");String param = "image=" + imgParam;// 注意这里仅为了简化编码每一次请求都去获取access_token，线上环境access_token有过期时间， 客户端可自行缓存，过期后重新获取。String accessToken = token;String result = HttpUtil.post(url, accessToken, param);System.out.println(result);return result;} catch (Exception e) {e.printStackTrace();}return null;}}

4.在AndroidManifest.xml中添加注册

4.1.注册除了MainActivity的其他两个界面，添加provider

       <activity android:name="com.example.myapplication.Albums"></activity><activity android:name="com.example.myapplication.Camera"></activity><providerandroid:name="androidx.core.content.FileProvider"android:authorities="com.example.myapplication.fileProvider"android:exported="false"android:grantUriPermissions="true"><meta-dataandroid:name="android.support.FILE_PROVIDER_PATHS"android:resource="@xml/file_paths" /></provider>

4.2.申请使用相机的权限，读写

    <uses-feature android:name="android.hardware.camera2" android:required="true" /><uses-permission android:name="android.permission.CAMERA" /><uses-feature android:name="android.hardware.camera" /><uses-feature android:name="android.hardware.camera.autofocus" /><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/><uses-permission android:name="android.permission.FLASHLIGHT" /><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.INTERNET" /><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.CAMERA"/>

5.添加图片保存的xml路径，添加方法和内容

在res文件夹下新建Directory，命名为xml，在其中新建 Values XML File文件，命名为file_paths.xml

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android"><external-pathname="my_images"path="." />
</paths>

运行结果：

模拟器

真机
相机
相册

二、调用百度API

1、登录百度AI平台（https://ai.baidu.com/），下载license文件

然后解压我们下载的sdk
(必须)将下载包libs目录中的ocr-sdk.jar文件拷贝到工程libs目录中，并加入工程依赖，加入工程依赖的方法，我一般是采用将jar文件直接复制到项目的libs目录，然后右键选择Add As Library；
(必须)将libs目录下armeabi，arm64-v8a，armeabi-v7a，x86文件夹按需添加到android studio工程src/main/jniLibs目录中(一般没有这个目录，自己新建一个）。

2.将在百度平台上下载下来的api.license文件添加到工程的assets文件夹找到工程所在的文件夹
依次打开app -> src -> main-> 新建文件夹 assets -> 将license文件放在assets文件夹中

3.在AndroidManifest.xml中添加以下权限（虽然刚才的代码中我已经添加了，这里给大家提醒一下）

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

4.要调用文字识别的方法，你必须获取access_token

详见百度官方文档

AssessToken工具类
package com.example.myapplication;import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;/*** 获取token类*/
public class AccessToken {/*** 获取权限token* @return 返回示例：* {* "access_token": "24.460da4889caad24cccdb1fea17221975.2592000.1491995545.282335-1234567",* "expires_in": 2592000* }*/public static String getAuth() {// 官网获取的 API Key 更新为你注册的String clientId = "ak";// 官网获取的 Secret Key 更新为你注册的String clientSecret = "sk";return getAuth(clientId, clientSecret);}/*** 获取API访问token* 该token有一定的有效期，需要自行管理，当失效时需重新获取.* @param ak - 百度云官网获取的 API Key* @param sk - 百度云官网获取的 Securet Key* @return assess_token 示例：* "24.460da4889caad24cccdb1fea17221975.2592000.1491995545.282335-1234567"*/public static String getAuth(String ak, String sk) {// 获取token地址String authHost = "https://aip.baidubce.com/oauth/2.0/token?";String getAccessTokenUrl = authHost// 1. grant_type为固定参数+ "grant_type=client_credentials"// 2. 官网获取的 API Key+ "&client_id=" + ak// 3. 官网获取的 Secret Key+ "&client_secret=" + sk;try {URL realUrl = new URL(getAccessTokenUrl);// 打开和URL之间的连接HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();connection.setRequestMethod("GET");connection.connect();// 获取所有响应头字段Map<String, List<String>> map = connection.getHeaderFields();// 遍历所有的响应头字段for (String key : map.keySet()) {System.err.println(key + "--->" + map.get(key));}// 定义 BufferedReader输入流来读取URL的响应BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));String result = "";String line;while ((line = in.readLine()) != null) {result += line;}/*** 返回结果示例*/System.err.println("result:" + result);JSONObject jsonObject = new JSONObject(result);String access_token = jsonObject.getString("access_token");return access_token;} catch (Exception e) {System.err.printf("获取token失败！");e.printStackTrace(System.err);}return null;}}

5.注意！FileLog类是我为了将文字识别回调结果写入本地txt文件中的工具类，如果只需要查看，可以在android studio的调试窗口看到由你的图片识别出的文字内容！

package com.example.myapplication;/*** Base64 工具类*/
public class Base64Util {private static final char last2byte = (char) Integer.parseInt("00000011", 2);private static final char last4byte = (char) Integer.parseInt("00001111", 2);private static final char last6byte = (char) Integer.parseInt("00111111", 2);private static final char lead6byte = (char) Integer.parseInt("11111100", 2);private static final char lead4byte = (char) Integer.parseInt("11110000", 2);private static final char lead2byte = (char) Integer.parseInt("11000000", 2);private static final char[] encodeTable = new char[]{'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'};public Base64Util() {}public static String encode(byte[] from) {StringBuilder to = new StringBuilder((int) ((double) from.length * 1.34D) + 3);int num = 0;char currentByte = 0;int i;for (i = 0; i < from.length; ++i) {for (num %= 8; num < 8; num += 6) {switch (num) {case 0:currentByte = (char) (from[i] & lead6byte);currentByte = (char) (currentByte >>> 2);case 1:case 3:case 5:default:break;case 2:currentByte = (char) (from[i] & last6byte);break;case 4:currentByte = (char) (from[i] & last4byte);currentByte = (char) (currentByte << 2);if (i + 1 < from.length) {currentByte = (char) (currentByte | (from[i + 1] & lead2byte) >>> 6);}break;case 6:currentByte = (char) (from[i] & last2byte);currentByte = (char) (currentByte << 4);if (i + 1 < from.length) {currentByte = (char) (currentByte | (from[i + 1] & lead4byte) >>> 4);}}to.append(encodeTable[currentByte]);}}if (to.length() % 4 != 0) {for (i = 4 - to.length() % 4; i > 0; --i) {to.append("=");}}return to.toString();}
}

package com.example.myapplication;import java.io.*;/*** 文件读取工具类*/
public class FileUtil {/*** 读取文件内容，作为字符串返回*/public static String readFileAsString(String filePath) throws IOException {File file = new File(filePath);if (!file.exists()) {throw new FileNotFoundException(filePath);}if (file.length() > 1024 * 1024 * 1024) {throw new IOException("File is too large");}StringBuilder sb = new StringBuilder((int) (file.length()));// 创建字节输入流FileInputStream fis = new FileInputStream(filePath);// 创建一个长度为10240的Bufferbyte[] bbuf = new byte[10240];// 用于保存实际读取的字节数int hasRead = 0;while ( (hasRead = fis.read(bbuf)) > 0 ) {sb.append(new String(bbuf, 0, hasRead));}fis.close();return sb.toString();}/*** 根据文件路径读取byte[] 数组*/public static byte[] readFileByBytes(String filePath) throws IOException {File file = new File(filePath);if (!file.exists()) {throw new FileNotFoundException(filePath);} else {ByteArrayOutputStream bos = new ByteArrayOutputStream((int) file.length());BufferedInputStream in = null;try {in = new BufferedInputStream(new FileInputStream(file));short bufSize = 1024;byte[] buffer = new byte[bufSize];int len1;while (-1 != (len1 = in.read(buffer, 0, bufSize))) {bos.write(buffer, 0, len1);}byte[] var7 = bos.toByteArray();return var7;} finally {try {if (in != null) {in.close();}} catch (IOException var14) {var14.printStackTrace();}bos.close();}}}
}

package com.example.myapplication;import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonParseException;import java.lang.reflect.Type;/*** Json工具类.*/
public class GsonUtils {private static Gson gson = new GsonBuilder().create();public static String toJson(Object value) {return gson.toJson(value);}public static <T> T fromJson(String json, Class<T> classOfT) throws JsonParseException {return gson.fromJson(json, classOfT);}public static <T> T fromJson(String json, Type typeOfT) throws JsonParseException {return (T) gson.fromJson(json, typeOfT);}
}

package com.example.myapplication;import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;/*** http 工具类*/
public class HttpUtil  {public static String post(String requestUrl, String accessToken, String params)throws Exception {String contentType = "application/x-www-form-urlencoded";return HttpUtil.post(requestUrl, accessToken, contentType, params);}public static String post(String requestUrl, String accessToken, String contentType, String params)throws Exception {String encoding = "UTF-8";if (requestUrl.contains("nlp")) {encoding = "GBK";}return HttpUtil.post(requestUrl, accessToken, contentType, params, encoding);}public static String post(String requestUrl, String accessToken, String contentType, String params, String encoding)throws Exception {String url = requestUrl + "?access_token=" + accessToken;return HttpUtil.postGeneralUrl(url, contentType, params, encoding);}public static String postGeneralUrl(String generalUrl, String contentType, String params, String encoding)throws Exception {URL url = new URL(generalUrl);// 打开和URL之间的连接HttpURLConnection connection = (HttpURLConnection) url.openConnection();connection.setRequestMethod("POST");// 设置通用的请求属性connection.setRequestProperty("Content-Type", contentType);connection.setRequestProperty("Connection", "Keep-Alive");connection.setUseCaches(false);connection.setDoOutput(true);connection.setDoInput(true);// 得到请求的输出流对象DataOutputStream out = new DataOutputStream(connection.getOutputStream());out.write(params.getBytes(encoding));out.flush();out.close();// 建立实际的连接connection.connect();// 获取所有响应头字段Map<String, List<String>> headers = connection.getHeaderFields();// 遍历所有的响应头字段for (String key : headers.keySet()) {System.err.println(key + "--->" + headers.get(key));}// 定义 BufferedReader输入流来读取URL的响应BufferedReader in = null;in = new BufferedReader(new InputStreamReader(connection.getInputStream(), encoding));String result = "";String getLine;while ((getLine = in.readLine()) != null) {result += getLine;}in.close();System.err.println("result:" + result);return result;}
}

package com.example.myapplication;import android.os.Environment;import java.io.File;
import java.io.FileWriter;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;public class FileLog {/*** 保存日志到本地存储根目录下* @param message      保存的信息* @param fileName     保存的文件名称* @param messageTitle 保存的信息标题*/public static void saveLog(String messageTitle,String message, String fileName) {String path = Environment.getExternalStorageDirectory() + "/路径名";File files = new File(path);Date date = new Date();SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-M-dd HH:mm:ss,EE", Locale.CHINA);String formatDate = dateFormat.format(date);if (!files.exists()) {files.mkdirs();}if (files.exists()) {try {FileWriter fw = new FileWriter(path + File.separator+ fileName + ".txt");fw.write(formatDate + " " + messageTitle + "\n");fw.write(message + "\n");fw.write("\n");fw.close();} catch (Exception e) {e.printStackTrace();}}}}

调用其方法在之前的Albums.java以及Camera.java中已经注明。同时提醒，在百度的官方文档中已有AccurateBasic类（根据自身需要进行改写），如下：

package com.baidu.ai.aip;import com.baidu.ai.aip.utils.Base64Util;
import com.baidu.ai.aip.utils.FileUtil;
import com.baidu.ai.aip.utils.HttpUtil;import java.net.URLEncoder;/**
* 通用文字识别（高精度版）
*/
public class AccurateBasic {/*** 重要提示代码中所需工具类* FileUtil,Base64Util,HttpUtil,GsonUtils请从* https://ai.baidu.com/file/658A35ABAB2D404FBF903F64D47C1F72* https://ai.baidu.com/file/C8D81F3301E24D2892968F09AE1AD6E2* https://ai.baidu.com/file/544D677F5D4E4F17B4122FBD60DB82B3* https://ai.baidu.com/file/470B3ACCA3FE43788B5A963BF0B625F3* 下载*/public static String accurateBasic() {// 请求urlString url = "https://aip.baidubce.com/rest/2.0/ocr/v1/accurate_basic";try {// 本地文件路径String filePath = "[本地文件路径]";byte[] imgData = FileUtil.readFileByBytes(filePath);String imgStr = Base64Util.encode(imgData);String imgParam = URLEncoder.encode(imgStr, "UTF-8");String param = "image=" + imgParam;// 注意这里仅为了简化编码每一次请求都去获取access_token，线上环境access_token有过期时间， 客户端可自行缓存，过期后重新获取。String accessToken = "[调用鉴权接口获取的token]";String result = HttpUtil.post(url, accessToken, param);System.out.println(result);return result;} catch (Exception e) {e.printStackTrace();}return null;}public static void main(String[] args) {AccurateBasic.accurateBasic();}
}

6.添加网络安全性配置network-security-config.xml文件

<?xml version="1.0" encoding="utf-8"?>
<network-security-config><base-config cleartextTrafficPermitted="true" />
</network-security-config>

结果

返回的是字符串，这边txt显示的只是百度OCR回调的结果，进行字符处理的方法可自行进行书写！

最后提醒，项目的包名一定要与你之前在百度申请的文字识别包名一致，血的教训！如果出错，记得检查manifest里面是否配置权限！相机进行文字识别需要先将图像保存后方可进行，不然会找不到图片的路径。项目内容已经过真机检验，并同时通过课程老师验收！

引用内容
Android studio调用手机相机拍照显示并保存+读取本地相册并显示
百度云通用文字识别官方文档

转载请标明出处，感谢对作者的理解与支持！

项目已经上传到github仓库，需要的朋友自取，谢谢三连！

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Android Studio实现文字识别（基于百度云OCR）

项目流程

一、调用手机相机/相册

二、调用百度API

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