Android 拍照识别文字

1.购买阿里云或者百度云的通用类文字识别

购买成功后到->控制台->云市场查看购买的API，复制它的APPCODE码。

前往 SDK下载页面下载Android SDK压缩包。

(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。

(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， eclipse用户默认为libs目录。

在工程AndroidManifest.xml文件中添加如下权限：

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

在MainActivity中修改如下：

import androidx.annotation.Nullable;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

import com.baidu.ocr.sdk.OCR;
import com.baidu.ocr.sdk.OnResultListener;
import com.baidu.ocr.sdk.exception.OCRError;
import com.baidu.ocr.sdk.model.AccessToken;
import com.baidu.ocr.ui.camera.CameraActivity;
import com.google.gson.Gson;

import java.io.File;

public class MainActivity extends AppCompatActivity {

    private TextView data1_obj;

    /**
     * 通用文字识别请求码
     */
    private static final int REQUEST_CODE_GENERAL_BASIC = 100;
    /**
     * 通用文字识别（高精度）请求码
     */
    private static final int REQUEST_CODE_ACCURATE_BASIC = 101;

    /**
     * 对应百度平台上的应用apiKey
     */
    private String apiKey = "gQm5vnWxGuz5khN4IZ16yriL";

    /**
     * 对应百度平台上的应用secretKey
     */
    private String secretKey = "c8t796hbq0DXdsngSsOou5FCK2fFckpn";

    /**
     * 弹窗
     */
    private AlertDialog.Builder mDialog;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //实例化，否则使用会报错 null object
        mDialog = new AlertDialog.Builder(this);

        data1_obj = findViewById(R.id.text1);

        initTextSDK();
    }

    /**
     * 用明文ak，sk初始化
     */
    private void initTextSDK() {
        OCR.getInstance(this).initAccessTokenWithAkSk(new OnResultListener<AccessToken>() {
            @Override
            public void onResult(AccessToken result) {
                String token = result.getAccessToken();
                Log.d("result-->", "成功！" + token);
            }

            @Override
            public void onError(OCRError error) {
                error.printStackTrace();
                Log.d("result-->", "失败！" + error.getMessage());

            }
        }, getApplicationContext(), apiKey, secretKey);
    }

    /**
     * Toast提示
     *
     * @param msg
     */
    private void showMsg(String msg) {
        Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
    }


    /**
     * 获取保存文件
     *
     * @param context
     * @return
     */
    public static File getSaveFile(Context context) {
        File file = new File(context.getFilesDir(), "pic.jpg");
        return file;
    }

    /**
     * 通用文字识别 （高精度版）
     *
     * @param view
     */
    public void highPrecision(View view) {
        Intent intent = new Intent(MainActivity.this, CameraActivity.class);
        intent.putExtra(CameraActivity.KEY_OUTPUT_FILE_PATH, getSaveFile(getApplication()).getAbsolutePath());
        intent.putExtra(CameraActivity.KEY_CONTENT_TYPE, CameraActivity.CONTENT_TYPE_GENERAL);
        startActivityForResult(intent, REQUEST_CODE_ACCURATE_BASIC);
    }


    /**
     * Activity回调
     *
     * @param requestCode
     * @param resultCode
     * @param data
     */
    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        // 识别成功回调，通用文字识别（高精度版）
        if (requestCode == REQUEST_CODE_ACCURATE_BASIC && resultCode == Activity.RESULT_OK) {
            RecognizeService.recAccurateBasic(this, getSaveFile(getApplicationContext()).getAbsolutePath(),
                    new RecognizeService.ServiceListener() {
                        @Override
                        public void onResult(String result) {
                            //弹窗显示识别内容
                            showDialog(result);
                            Log.d("result-->", result);
                        }
                    });
        }
    }

    /**
     * 显示识别结果弹窗
     * @param result
     */
    private void showDialog(final String result) {
        this.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                //数据解析 Gson将JSON字符串转为实体Bean
                TextResult textResult = new Gson().fromJson(result, TextResult.class);
                if (textResult.getWords_result() == null && textResult.getWords_result().size() <= 0) {
                    return;
                }
                String text = "";
                //数据不为空并且大于0
                for(int i = 0;i<textResult.getWords_result().size();i++){
                    text += textResult.getWords_result().get(i).getWords()+"\n";
                }
                mDialog.setMessage(text)
                        .setPositiveButton("确定", null)
                        .show();
            }
        });
    }


}

RecognizeService.java

import android.content.Context;

import com.baidu.ocr.sdk.OCR;
import com.baidu.ocr.sdk.OnResultListener;
import com.baidu.ocr.sdk.exception.OCRError;
import com.baidu.ocr.sdk.model.BankCardParams;
import com.baidu.ocr.sdk.model.BankCardResult;
import com.baidu.ocr.sdk.model.GeneralBasicParams;
import com.baidu.ocr.sdk.model.GeneralParams;
import com.baidu.ocr.sdk.model.GeneralResult;
import com.baidu.ocr.sdk.model.OcrRequestParams;
import com.baidu.ocr.sdk.model.OcrResponseResult;
import com.baidu.ocr.sdk.model.Word;
import com.baidu.ocr.sdk.model.WordSimple;

import java.io.File;

/**
 * Created by ruanshimin on 2017/4/20.
 */

public class RecognizeService {

    interface ServiceListener {
        public void onResult(String result);
    }

    public static void recGeneral(Context ctx, String filePath, final ServiceListener listener) {
        GeneralParams param = new GeneralParams();
        param.setDetectDirection(true);
        param.setVertexesLocation(true);
        param.setRecognizeGranularity(GeneralParams.GRANULARITY_SMALL);
        param.setImageFile(new File(filePath));
        OCR.getInstance(ctx).recognizeGeneral(param, new OnResultListener<GeneralResult>() {
            @Override
            public void onResult(GeneralResult result) {
                StringBuilder sb = new StringBuilder();
                for (WordSimple wordSimple : result.getWordList()) {
                    Word word = (Word) wordSimple;
                    sb.append(word.getWords());
                    sb.append("\n");
                }
                listener.onResult(result.getJsonRes());
            }

            @Override
            public void onError(OCRError error) {
                listener.onResult(error.getMessage());
            }
        });
    }

    public static void recAccurate(Context ctx, String filePath, final ServiceListener listener) {
        GeneralParams param = new GeneralParams();
        param.setDetectDirection(true);
        param.setVertexesLocation(true);
        param.setRecognizeGranularity(GeneralParams.GRANULARITY_SMALL);
        param.setImageFile(new File(filePath));
        OCR.getInstance(ctx).recognizeAccurate(param, new OnResultListener<GeneralResult>() {
            @Override
            public void onResult(GeneralResult result) {
                StringBuilder sb = new StringBuilder();
                for (WordSimple wordSimple : result.getWordList()) {
                    Word word = (Word) wordSimple;
                    sb.append(word.getWords());
                    sb.append("\n");
                }
                listener.onResult(result.getJsonRes());
            }

            @Override
            public void onError(OCRError error) {
                listener.onResult(error.getMessage());
            }
        });
    }

    public static void recAccurateBasic(Context ctx, String filePath, final ServiceListener listener) {
        GeneralParams param = new GeneralParams();
        param.setDetectDirection(true);
        param.setVertexesLocation(true);
        param.setRecognizeGranularity(GeneralParams.GRANULARITY_SMALL);
        param.setImageFile(new File(filePath));
        OCR.getInstance(ctx).recognizeAccurateBasic(param, new OnResultListener<GeneralResult>() {
            @Override
            public void onResult(GeneralResult result) {
                StringBuilder sb = new StringBuilder();
                for (WordSimple wordSimple : result.getWordList()) {
                    WordSimple word = wordSimple;
                    sb.append(word.getWords());
                    sb.append("\n");
                }
                listener.onResult(result.getJsonRes());
            }

            @Override
            public void onError(OCRError error) {
                listener.onResult(error.getMessage());
            }
        });
    }


    public static void recGeneralBasic(Context ctx, String filePath, final ServiceListener listener) {
        GeneralBasicParams param = new GeneralBasicParams();
        param.setDetectDirection(true);
        param.setImageFile(new File(filePath));
        OCR.getInstance(ctx).recognizeGeneralBasic(param, new OnResultListener<GeneralResult>() {
            @Override
            public void onResult(GeneralResult result) {
                StringBuilder sb = new StringBuilder();
                for (WordSimple wordSimple : result.getWordList()) {
                    WordSimple word = wordSimple;
                    sb.append(word.getWords());
                    sb.append("\n");
                }
                listener.onResult(result.getJsonRes());
            }

            @Override
            public void onError(OCRError error) {
                listener.onResult(error.getMessage());
            }
        });
    }

    public static void recGeneralEnhanced(Context ctx, String filePath, final ServiceListener listener) {
        GeneralBasicParams param = new GeneralBasicParams();
        param.setDetectDirection(true);
        param.setImageFile(new File(filePath));
        OCR.getInstance(ctx).recognizeGeneralEnhanced(param, new OnResultListener<GeneralResult>() {
            @Override
            public void onResult(GeneralResult result) {
                StringBuilder sb = new StringBuilder();
                for (WordSimple wordSimple : result.getWordList()) {
                    WordSimple word = wordSimple;
                    sb.append(word.getWords());
                    sb.append("\n");
                }
                listener.onResult(result.getJsonRes());
            }

            @Override
            public void onError(OCRError error) {
                listener.onResult(error.getMessage());
            }
        });
    }

    public static void recWebimage(Context ctx, String filePath, final ServiceListener listener) {
        GeneralBasicParams param = new GeneralBasicParams();
        param.setDetectDirection(true);
        param.setImageFile(new File(filePath));
        OCR.getInstance(ctx).recognizeWebimage(param, new OnResultListener<GeneralResult>() {
            @Override
            public void onResult(GeneralResult result) {
                StringBuilder sb = new StringBuilder();
                for (WordSimple wordSimple : result.getWordList()) {
                    WordSimple word = wordSimple;
                    sb.append(word.getWords());
                    sb.append("\n");
                }
                listener.onResult(result.getJsonRes());
            }

            @Override
            public void onError(OCRError error) {
                listener.onResult(error.getMessage());
            }
        });
    }

    public static void recBankCard(Context ctx, String filePath, final ServiceListener listener) {
        BankCardParams param = new BankCardParams();
        param.setImageFile(new File(filePath));
        OCR.getInstance(ctx).recognizeBankCard(param, new OnResultListener<BankCardResult>() {
            @Override
            public void onResult(BankCardResult result) {
                String res = String.format("卡号：%s\n类型：%s\n发卡行：%s",
                        result.getBankCardNumber(),
                        result.getBankCardType().name(),
                        result.getBankName());
                listener.onResult(res);
            }

            @Override
            public void onError(OCRError error) {
                listener.onResult(error.getMessage());
            }
        });
    }

    public static void recVehicleLicense(Context ctx, String filePath, final ServiceListener listener) {
        OcrRequestParams param = new OcrRequestParams();
        param.setImageFile(new File(filePath));
        OCR.getInstance(ctx).recognizeVehicleLicense(param, new OnResultListener<OcrResponseResult>() {
            @Override
            public void onResult(OcrResponseResult result) {
                listener.onResult(result.getJsonRes());
            }

            @Override
            public void onError(OCRError error) {
                listener.onResult(error.getMessage());
            }
        });
    }

    public static void recDrivingLicense(Context ctx, String filePath, final ServiceListener listener) {
        OcrRequestParams param = new OcrRequestParams();
        param.setImageFile(new File(filePath));
        OCR.getInstance(ctx).recognizeDrivingLicense(param, new OnResultListener<OcrResponseResult>() {
            @Override
            public void onResult(OcrResponseResult result) {
                listener.onResult(result.getJsonRes());
            }

            @Override
            public void onError(OCRError error) {
                listener.onResult(error.getMessage());
            }
        });
    }

    public static void recLicensePlate(Context ctx, String filePath, final ServiceListener listener) {
        OcrRequestParams param = new OcrRequestParams();
        param.setImageFile(new File(filePath));
        OCR.getInstance(ctx).recognizeLicensePlate(param, new OnResultListener<OcrResponseResult>() {
            @Override
            public void onResult(OcrResponseResult result) {
                listener.onResult(result.getJsonRes());
            }

            @Override
            public void onError(OCRError error) {
                listener.onResult(error.getMessage());
            }
        });
    }

    public static void recBusinessLicense(Context ctx, String filePath, final ServiceListener listener) {
        OcrRequestParams param = new OcrRequestParams();
        param.setImageFile(new File(filePath));
        OCR.getInstance(ctx).recognizeBusinessLicense(param, new OnResultListener<OcrResponseResult>() {
            @Override
            public void onResult(OcrResponseResult result) {
                listener.onResult(result.getJsonRes());
            }

            @Override
            public void onError(OCRError error) {
                listener.onResult(error.getMessage());
            }
        });
    }

    public static void recReceipt(Context ctx, String filePath, final ServiceListener listener) {
        OcrRequestParams param = new OcrRequestParams();
        param.setImageFile(new File(filePath));
        param.putParam("detect_direction", "true");
        OCR.getInstance(ctx).recognizeReceipt(param, new OnResultListener<OcrResponseResult>() {
            @Override
            public void onResult(OcrResponseResult result) {
                listener.onResult(result.getJsonRes());
            }

            @Override
            public void onError(OCRError error) {
                listener.onResult(error.getMessage());
            }
        });
    }

    public static void recPassport(Context ctx, String filePath, final ServiceListener listener) {
        OcrRequestParams param = new OcrRequestParams();
        param.setImageFile(new File(filePath));
        OCR.getInstance(ctx).recognizePassport(param, new OnResultListener<OcrResponseResult>() {
            @Override
            public void onResult(OcrResponseResult result) {
                listener.onResult(result.getJsonRes());
            }

            @Override
            public void onError(OCRError error) {
                listener.onResult(error.getMessage());
            }
        });
    }

    public static void recVatInvoice(Context ctx, String filePath, final ServiceListener listener) {
        OcrRequestParams param = new OcrRequestParams();
        param.setImageFile(new File(filePath));
        OCR.getInstance(ctx).recognizeVatInvoice(param, new OnResultListener<OcrResponseResult>() {
            @Override
            public void onResult(OcrResponseResult result) {
                listener.onResult(result.getJsonRes());
            }

            @Override
            public void onError(OCRError error) {
                listener.onResult(error.getMessage());
            }
        });
    }

    public static void recQrcode(Context ctx, String filePath, final ServiceListener listener) {
        OcrRequestParams param = new OcrRequestParams();
        param.setImageFile(new File(filePath));
        OCR.getInstance(ctx).recognizeQrcode(param, new OnResultListener<OcrResponseResult>() {
            @Override
            public void onResult(OcrResponseResult result) {
                listener.onResult(result.getJsonRes());
            }

            @Override
            public void onError(OCRError error) {
                listener.onResult(error.getMessage());
            }
        });
    }

    public static void recNumbers(Context ctx, String filePath, final ServiceListener listener) {
        OcrRequestParams param = new OcrRequestParams();
        param.setImageFile(new File(filePath));
        OCR.getInstance(ctx).recognizeNumbers(param, new OnResultListener<OcrResponseResult>() {
            @Override
            public void onResult(OcrResponseResult result) {
                listener.onResult(result.getJsonRes());
            }

            @Override
            public void onError(OCRError error) {
                listener.onResult(error.getMessage());
            }
        });
    }

    public static void recLottery(Context ctx, String filePath, final ServiceListener listener) {
        OcrRequestParams param = new OcrRequestParams();
        param.setImageFile(new File(filePath));
        OCR.getInstance(ctx).recognizeLottery(param, new OnResultListener<OcrResponseResult>() {
            @Override
            public void onResult(OcrResponseResult result) {
                listener.onResult(result.getJsonRes());
            }

            @Override
            public void onError(OCRError error) {
                listener.onResult(error.getMessage());
            }
        });
    }

    public static void recBusinessCard(Context ctx, String filePath, final ServiceListener listener) {
        OcrRequestParams param = new OcrRequestParams();
        param.setImageFile(new File(filePath));
        OCR.getInstance(ctx).recognizeBusinessCard(param, new OnResultListener<OcrResponseResult>() {
            @Override
            public void onResult(OcrResponseResult result) {
                listener.onResult(result.getJsonRes());
            }

            @Override
            public void onError(OCRError error) {
                listener.onResult(error.getMessage());
            }
        });
    }

    public static void recHandwriting(Context ctx, String filePath, final ServiceListener listener) {
        OcrRequestParams param = new OcrRequestParams();
        param.setImageFile(new File(filePath));
        OCR.getInstance(ctx).recognizeHandwriting(param, new OnResultListener<OcrResponseResult>() {
            @Override
            public void onResult(OcrResponseResult result) {
                listener.onResult(result.getJsonRes());
            }

            @Override
            public void onError(OCRError error) {
                listener.onResult(error.getMessage());
            }
        });
    }

    public static void recCustom(Context ctx, String filePath, final ServiceListener listener) {
        OcrRequestParams param = new OcrRequestParams();
        param.putParam("templateSign", "");
        param.putParam("classifierId", 0);
        param.setImageFile(new File(filePath));
        OCR.getInstance(ctx).recognizeCustom(param, new OnResultListener<OcrResponseResult>() {
            @Override
            public void onResult(OcrResponseResult result) {
                listener.onResult(result.getJsonRes());
            }

            @Override
            public void onError(OCRError error) {
                listener.onResult(error.getMessage());
            }
        });
    }
}

TextResult.java

import java.util.List;

/**
 * 文字识别结果实体Bean
 * @author llw
 */
public class TextResult {

    /**
     * log_id : 3898664750364047297
     * direction : 0
     * words_result_num : 4
     * words_result : [{"words":"突然间有想看书的冲动"},{"words":"你不是真正的快乐"},{"words":"你说你有点难追"},{"words":"我就打断你的腿"}]
     */

    private long log_id;
    private int direction;
    private int words_result_num;
    private List<WordsResultBean> words_result;

    public long getLog_id() {
        return log_id;
    }

    public void setLog_id(long log_id) {
        this.log_id = log_id;
    }

    public int getDirection() {
        return direction;
    }

    public void setDirection(int direction) {
        this.direction = direction;
    }

    public int getWords_result_num() {
        return words_result_num;
    }

    public void setWords_result_num(int words_result_num) {
        this.words_result_num = words_result_num;
    }

    public List<WordsResultBean> getWords_result() {
        return words_result;
    }

    public void setWords_result(List<WordsResultBean> words_result) {
        this.words_result = words_result;
    }

    public static class WordsResultBean {
        /**
         * words : 突然间有想看书的冲动
         */

        private String words;

        public String getWords() {
            return words;
        }

        public void setWords(String words) {
            this.words = words;
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/high_precision_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="highPrecision"
        android:text="通用文字识别" />

    <TextView
        android:id="@+id/text1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text=""/>

</LinearLayout>