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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