Android使用Tesseract-ocr进行文字识别

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.1.2'
        classpath 'org.codehaus.groovy:groovy-backports-compat23:2.3.5'
        classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.0'
        classpath 'com.github.dcendents:android-maven-gradle-plugin:1.5'
    }
}

apply plugin: 'com.android.library'
apply plugin: 'com.github.dcendents.android-maven'
apply plugin: 'com.jfrog.bintray'

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

<?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:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="300dp"
        android:id="@+id/imgv"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/btnOcr"
        android:text="识别"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        android:id="@+id/tvshow" />

</LinearLayout>

public class MainActivity extends AppCompatActivity {

    private ImageView imgv;
    private TextView tvshow;
    private Button btnocr;
    private Bitmap bmp;

    //如果Android的版本大于23，路径取根目录下的tesserart，小于的话是
    //在mnt/sdcard下面
    private String DATAPATH=Environment.getExternalStorageDirectory().getAbsolutePath() +
            File.separator + "tesserart";

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

        requestPermission();


        imgv=findViewById(R.id.imgv);
        //获取自己的图片，这里是自己放在项目里面的。
        bmp=BitmapFactory.decodeResource(this.getResources(), R.drawable.tiddmg);
        imgv.setImageBitmap(bmp);
        imgv.setScaleType(ImageView.ScaleType.FIT_XY);

        tvshow=findViewById(R.id.tvshow);
        btnocr=findViewById(R.id.btnOcr);

        btnocr.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                try {
                    TessBaseAPI mTess=new TessBaseAPI();
                    //存放tessdata的文件路径 就是chi_sim.traineddata文件的位置chi_sim.traineddata
                    //选择语言 chi_sim 简体中文  eng 英文
                    String language="chi_sim";

                    File dirdatapath=new File(DATAPATH);
                    if (!dirdatapath.exists()) {
                        dirdatapath.mkdirs();
                    }
                    File dir=new File(DATAPATH,"tessdata");
                    if (!dir.exists())
                        dir.mkdirs();
                    tvshow.append(DATAPATH+"\r\n");
                    mTess.init(DATAPATH, language);
                    //将图片设置到mTess进行识别
                    mTess.setImage(bmp);
                    //获取识别的文字（这里会等一段时间，这里的代码是在主线程的，建议将这部分代码放到子线程）
                    String result=mTess.getUTF8Text();
                    tvshow.append("结果为:" + result);
                } catch (Exception e) {
                    e.printStackTrace();
                    tvshow.append(e.getMessage());
                }
            }
        });

    }

    void requestPermission() {
        final int REQUEST_CODE=1;
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, new String[]{
                            Manifest.permission.WRITE_EXTERNAL_STORAGE,
                            Manifest.permission.READ_EXTERNAL_STORAGE},
                    REQUEST_CODE);
        }
    }

}