赞
踩
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)
1.activity_main.xml和MainActivity.java
**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.ConstraintLayout android: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"> <TextView android: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"/> <Button android: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"/> <Button android: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"> <solid android:color="#fff"/> <corners android:radius="10dp"/> </shape> </item> </ripple>
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; @Override protected 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() { @Override public 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() { @Override public 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Intent intent2=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
<?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"> <Button android: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" /> <Button android: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" /> <ImageView android: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>
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(){ @Override public 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() { @Override public void onClick(View v) { new Thread(){ @Override public 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() { @Override public 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 @Override protected 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url AccessToken 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
<?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"> <Button android: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" /> <Button android: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" /> <Button android: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" /> <ImageView android: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>
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7.0 if (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() { @Override public 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() { @Override public void onClick(View v) { System.out.println(uriden); new Thread(){ @Override public 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imageUri intent4.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(); } } @Override protected 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url AccessToken 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
<activity android:name="com.example.myapplication.Albums"></activity>
<activity android:name="com.example.myapplication.Camera"></activity>
<provider
android:name="androidx.core.content.FileProvider"
android:authorities="com.example.myapplication.fileProvider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths" />
</provider>
<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
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path
name="my_images"
path="." />
</paths>
运行结果:
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Buffer byte[] 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(); } } } }
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url String 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!
转载请标明出处,感谢对作者的理解与支持!
可帮助实现识别结果优化回调、android各版本适配,需要的朋友联系QQ:2323257081,谢谢三连!
Copyright © 2003-2013 www.wpsshop.cn 版权所有,并保留所有权利。