Android基于tesseract_ocr和tessdata的

一.开发前准备工作

1.下载tess-two-master项目。https://github.com/rmtheis/tess-two
2.下载tessdata-master匹配库。https://github.com/tesseract-ocr/tessdata/tree/3.04.00
3.Android Studio配置ndk的路径。

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二.

1.新建项目 ，将tess-two作为依赖文件，添加到项目中，同时在build gradle（Mudule :app中添加 compile project(':tess-two')）。

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2.在项目的build.gradle(project:xxxx)的dependencis添加以下代码

---

    classpath 'com.github.dcendents:android-maven-gradle-plugin:1.5'
    classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.0'

---

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3.在MainActivity中的代码（图片文件自己添加就可以了，记得添加文件读写权限）

---

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

private TextView tvResult;
private ImageView ivPic;
private Button btnEng;
private Button btnClear;
private Button btnChisim;

private TessBaseAPI mTess;
private Handler handler;
private String path;
private boolean tag;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    initView();
    initData();
    setListener();
}

private void initView() {
    tvResult = (TextView) findViewById(R.id.tv_result);
    ivPic = (ImageView) findViewById(R.id.iv);
    btnEng = (Button) findViewById(R.id.btn_eng);
    btnClear = (Button) findViewById(R.id.btn_clear);
    btnChisim = (Button) findViewById(R.id.btn_chi_sim);
}

private void initData() {
    handler = new InnHandler();
    path = getDiskCacheDir(this);
    mTess = new TessBaseAPI();

    //存放tessdata的路径，注意放到一个目录的下面，即dir1/dir2/xxxx
    File dir = new File(path, "tessdata");
    if (!dir.exists()) {
        dir.mkdirs();
    }
}

private void setListener() {
    btnEng.setOnClickListener(this);
    btnChisim.setOnClickListener(this);
    btnClear.setOnClickListener(this);
}

@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.btn_eng:
            initTessBaseData("eng", R.mipmap.eng);
            break;
        case R.id.btn_chi_sim:
            initTessBaseData("chi_sim", R.mipmap.chi_sim);
            break;
        case R.id.btn_clear:
            tvResult.setText("");
            break;
        default:
            break;
    }
}

/**
 * @param language 样本匹配库
 */
private void initTessBaseData(final String language, final int imgId) {
    tag = false;
    tvResult.setText("识别中。。。");
    ivPic.setImageBitmap(BitmapFactory.decodeResource(getResources(), imgId));
    new Thread(new Runnable() {
        @Override
        public void run() {
            tag = mTess.init(path, language);
            if (tag) {
                Message msg = new Message();
                msg.what = 1;
                msg.obj = imgId;
                handler.sendMessage(msg);
            }
        }
    }).start();
}

/**
 * 对图片的识别操作(耗时操作，放到线程里)
 *
 * @param imgId 图片资源ID
 */
private void method(int imgId) {
    Bitmap bitmap = BitmapFactory.decodeResource(getResources(), imgId);
    ivPic.setImageBitmap(bitmap);
    if (tag) {
        mTess.setImage(bitmap);
        //开启一个线程
        new InnThread().start();
    }
}

/**
 * 获取缓存的目录
 *
 * @param context 上下文对象
 * @return cache目录的路径
 */
public static String getDiskCacheDir(Context context) {
    String cachePath;
    if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())
            || !Environment.isExternalStorageRemovable()) {
        //SD卡存在，或者sd卡不可移动
        cachePath = context.getExternalCacheDir().getPath();
    } else {
        cachePath = context.getCacheDir().getPath();
    }
    return cachePath;
}


private class InnThread extends Thread {
    @Override
    public void run() {
        super.run();
        synchronized (this) {
            String result = mTess.getUTF8Text();
            Message msg = new Message();
            msg.what = 2;
            msg.obj = result;
            handler.sendMessage(msg);
        }
    }
}


/**
 * 在UI线程中刷新结果
 */
private class InnHandler extends Handler {
    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        switch (msg.what) {
            case 1:
                if (tag) {
                    int imgId = (int) msg.obj;
                    method(imgId);
                }
                break;
            case 2:
                String result = (String) msg.obj;
                tvResult.setText(String.valueOf("结果:" + result));
                break;
            default:
                break;
        }

    }
}

}

---

注意：tessdata文件中我们并不是需要取所有库，测试取2个库放到之前项目中定义的路径下，我这儿是直接放在了/Android/data/com.example.administrator.tesseract_ocr/cache/tessdata/xxx中。

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github地址：https://github.com/lucklyperson/Tesseract_ocr