【实例简介】

tessdata是语言包 需要放到手机SD卡根目录

tess-two是OCR引擎，需要导入到项目中(项目中已经导入)

【实例截图】

【核心代码】

package com.mikewong.tool.tesseract;

import java.io.File;

import java.io.FileNotFoundException;

import com.googlecode.tesseract.android.TessBaseAPI;

import android.net.Uri;

import android.os.Bundle;

import android.os.Environment;

import android.os.Handler;

import android.os.Message;

import android.provider.MediaStore;

import android.app.Activity;

import android.content.Intent;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.CheckBox;

import android.widget.ImageView;

import android.widget.RadioGroup;

import android.widget.RadioGroup.OnCheckedChangeListener;

import android.widget.TextView;

public class MainActivity extends Activity {

private static final int PHOTO_CAPTURE = 0x11;// 拍照

private static final int PHOTO_RESULT = 0x12;// 结果

private static String LANGUAGE = "eng";

private static String IMG_PATH = getSDPath() java.io.File.separator

"ocrtest";

private static TextView tvResult;

private static ImageView ivSelected;

private static ImageView ivTreated;

private static Button btnCamera;

private static Button btnSelect;

private static CheckBox chPreTreat;

private static RadioGroup radioGroup;

private static String textResult;

private static Bitmap bitmapSelected;

private static Bitmap bitmapTreated;

private static final int SHOWRESULT = 0x101;

private static final int SHOWTREATEDIMG = 0x102;

// 该handler用于处理修改结果的任务

public static Handler myHandler = new Handler() {

@Override

public void handleMessage(Message msg) {

switch (msg.what) {

case SHOWRESULT:

if (textResult.equals(""))

tvResult.setText("识别失败");

else

tvResult.setText(textResult);

break;

case SHOWTREATEDIMG:

tvResult.setText("识别中......");

showPicture(ivTreated, bitmapTreated);

break;

}

super.handleMessage(msg);

}

};

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

// 若文件夹不存在 首先创建文件夹

File path = new File(IMG_PATH);

if (!path.exists()) {

path.mkdirs();

}

tvResult = (TextView) findViewById(R.id.tv_result);

ivSelected = (ImageView) findViewById(R.id.iv_selected);

ivTreated = (ImageView) findViewById(R.id.iv_treated);

btnCamera = (Button) findViewById(R.id.btn_camera);

btnSelect = (Button) findViewById(R.id.btn_select);

chPreTreat = (CheckBox) findViewById(R.id.ch_pretreat);

radioGroup = (RadioGroup) findViewById(R.id.radiogroup);

btnCamera.setOnClickListener(new cameraButtonListener());

btnSelect.setOnClickListener(new selectButtonListener());

// 用于设置解析语言

radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {

@Override

public void onCheckedChanged(RadioGroup group, int checkedId) {

switch (checkedId) {

case R.id.rb_en:

LANGUAGE = "eng";

break;

case R.id.rb_ch:

LANGUAGE = "chi_sim";

break;

}

}

});

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

if (resultCode == Activity.RESULT_CANCELED)

return;

if (requestCode == PHOTO_CAPTURE) {

tvResult.setText("abc");

startPhotoCrop(Uri.fromFile(new File(IMG_PATH, "temp.jpg")));

}

// 处理结果

if (requestCode == PHOTO_RESULT) {

bitmapSelected = decodeUriAsBitmap(Uri.fromFile(new File(IMG_PATH,

"temp_cropped.jpg")));

if (chPreTreat.isChecked())

tvResult.setText("预处理中......");

else

tvResult.setText("识别中......");

// 显示选择的图片

showPicture(ivSelected, bitmapSelected);

// 新线程来处理识别

new Thread(new Runnable() {

@Override

public void run() {

if (chPreTreat.isChecked()) {

bitmapTreated = ImgPretreatment

.doPretreatment(bitmapSelected);

Message msg = new Message();

msg.what = SHOWTREATEDIMG;

myHandler.sendMessage(msg);

textResult = doOcr(bitmapTreated, LANGUAGE);

} else {

bitmapTreated = ImgPretreatment

.converyToGrayImg(bitmapSelected);

Message msg = new Message();

msg.what = SHOWTREATEDIMG;

myHandler.sendMessage(msg);

textResult = doOcr(bitmapTreated, LANGUAGE);

}

Message msg2 = new Message();

msg2.what = SHOWRESULT;

myHandler.sendMessage(msg2);

}

}).start();

}

super.onActivityResult(requestCode, resultCode, data);

}

// 拍照识别

class cameraButtonListener implements OnClickListener {

@Override

public void onClick(View arg0) {

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

intent.putExtra(MediaStore.EXTRA_OUTPUT,

Uri.fromFile(new File(IMG_PATH, "temp.jpg")));

startActivityForResult(intent, PHOTO_CAPTURE);

}

};

// 从相册选取照片并裁剪

class selectButtonListener implements OnClickListener {

@Override

public void onClick(View v) {

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);

intent.addCategory(Intent.CATEGORY_OPENABLE);

intent.setType("image/*");

intent.putExtra("crop", "true");

intent.putExtra("scale", true);

intent.putExtra("return-data", false);

intent.putExtra(MediaStore.EXTRA_OUTPUT,

Uri.fromFile(new File(IMG_PATH, "temp_cropped.jpg")));

intent.putExtra("outputFormat",

Bitmap.CompressFormat.JPEG.toString());

intent.putExtra("noFaceDetection", true); // no face detection

startActivityForResult(intent, PHOTO_RESULT);

}

}

// 将图片显示在view中

public static void showPicture(ImageView iv, Bitmap bmp){

iv.setImageBitmap(bmp);

}

/**

* 进行图片识别

*

* @param bitmap

* 待识别图片

* @param language

* 识别语言

* @return 识别结果字符串

*/

public String doOcr(Bitmap bitmap, String language) {

TessBaseAPI baseApi = new TessBaseAPI();

baseApi.init(getSDPath(), language);

// 必须加此行，tess-two要求BMP必须为此配置

bitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true);

baseApi.setImage(bitmap);

String text = baseApi.getUTF8Text();

baseApi.clear();

baseApi.end();

return text;

}

/**

* 获取sd卡的路径

*

* @return 路径的字符串

*/

public static String getSDPath() {

File sdDir = null;

boolean sdCardExist = Environment.getExternalStorageState().equals(

android.os.Environment.MEDIA_MOUNTED); // 判断sd卡是否存在

if (sdCardExist) {

sdDir = Environment.getExternalStorageDirectory();// 获取外存目录

}

return sdDir.toString();

}

/**

* 调用系统图片编辑进行裁剪

*/

public void startPhotoCrop(Uri uri) {

Intent intent = new Intent("com.android.camera.action.CROP");

intent.setDataAndType(uri, "image/*");

intent.putExtra("crop", "true");

intent.putExtra("scale", true);

intent.putExtra(MediaStore.EXTRA_OUTPUT,

Uri.fromFile(new File(IMG_PATH, "temp_cropped.jpg")));

intent.putExtra("return-data", false);

intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());

intent.putExtra("noFaceDetection", true); // no face detection

startActivityForResult(intent, PHOTO_RESULT);

}

/**

* 根据URI获取位图

*

* @param uri

* @return 对应的位图

*/

private Bitmap decodeUriAsBitmap(Uri uri) {

Bitmap bitmap = null;

try {

bitmap = BitmapFactory.decodeStream(getContentResolver()

.openInputStream(uri));

} catch (FileNotFoundException e) {

e.printStackTrace();

return null;

}

return bitmap;

}

}