Question

我想在Android中实现OCR。即从名片图像中获取文本。我使用了来自here的代码。

但是当我运行此代码时，我收到以下错误：

java.lang.NoClassDefFoundError： org.apache.http.entity.mime.content.FileBody

我认为它指向以下一行：

final FileBody image = new FileBody(new File(filePath));

OCRServiceAPI类的

。我该如何解决这个问题？

Answer 1

无法猜测您的上述错误，但我已在错误> 中使用第三方应用 ABBYY OCR产品在 Blackberry 中完成此任务>服务器。

在我长期的R＆amp; D我还参与了Github_Abbyy的以下链接。要使用此代码，您应在此处创建免费帐户：ocrsdk.com

Answer 2

检查您是否获得了从图库中选择的图像的正确路径。

我也试过这个演示，它对我来说很好。

我在这里发布了我的代码：

OCRServiceAPI.java

public class OCRServiceAPI {  
public final String m_serviceUrl = "http://api.ocrapiservice.com/1.0/rest/ocr";
private final String m_paramImage = "image";
private final String m_paramLanguage = "language";
private final String m_paramApiKey = "apikey";
private String m_apiKey, m_responseText;
private int m_responseCode; 
public OCRServiceAPI(final String p_apiKey) {
    this.m_apiKey = p_apiKey;
}
/*
 * Convert image to text.
 * 
 * @param language The image text language.
 * 
 * @param filePath The image absolute file path.
 * 
 * @return true if everything went okay and false if there is an error with
 * sending and receiving data.
 */
public boolean convertToText(final String p_language,
        final String p_filePath) {
    try {
        sendImage(p_language, p_filePath);
        return true;
    } catch (ClientProtocolException e) {
        e.printStackTrace();
        return false;
    } catch (IOException e) {
        e.printStackTrace();
        return false;
    }
}
/*
 * Send image to OCR service and read response.
 * 
 * @param language The image text language.
 * 
 * @param filePath The image absolute file path.
 */
private void sendImage(final String p_language, final String p_filePath)
        throws ClientProtocolException, IOException {
    final HttpClient m_httpclient = new DefaultHttpClient();
    final HttpPost m_httppost = new HttpPost(m_serviceUrl);
    final FileBody m_image = new FileBody(new File(p_filePath));
    final MultipartEntity m_reqEntity = new MultipartEntity();
    m_reqEntity.addPart(m_paramImage, m_image);
    m_reqEntity.addPart(m_paramLanguage, new StringBody(p_language));
    m_reqEntity.addPart(m_paramApiKey, new StringBody(getApiKey()));
    m_httppost.setEntity(m_reqEntity);
    final HttpResponse m_response = m_httpclient.execute(m_httppost);
    final HttpEntity m_resEntity = m_response.getEntity();
    final StringBuilder m_sb = new StringBuilder();
    if (m_resEntity != null) {
        final InputStream m_stream = m_resEntity.getContent();
        byte m_bytes[] = new byte[4096];
        int m_numBytes;
        while ((m_numBytes = m_stream.read(m_bytes)) != -1) {
            if (m_numBytes != 0) {
                m_sb.append(new String(m_bytes, 0, m_numBytes));
            }
        }
    }
    setResponseCode(m_response.getStatusLine().getStatusCode());
    setResponseText(m_sb.toString());
}
public int getResponseCode() {
    return m_responseCode;
}
public void setResponseCode(int p_responseCode) {
    this.m_responseCode = p_responseCode;
}
public String getResponseText() {
    return m_responseText;
}
public void setResponseText(String p_responseText) {
    this.m_responseText = p_responseText;
}
public String getApiKey() {
    return m_apiKey;
}
public void setApiKey(String p_apiKey) {
    this.m_apiKey = p_apiKey;
}   }

SampleActivity.java

public class SampleActivity extends Activity implements OnClickListener {
private final int RESPONSE_OK = 200;
private final int IMAGE_PICKER_REQUEST = 1;
private TextView m_tvPicNameText;
private EditText m_etLangCodeField, m_etApiKeyFiled;
private String m_apiKey; // T7GNRh7VmH
private String m_langCode; // en
private String m_fileName;
@Override
public void onCreate(Bundle p_savedInstanceState) {
    super.onCreate(p_savedInstanceState);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.main);
    m_tvPicNameText = (TextView) findViewById(R.id.imageName);
    m_etLangCodeField = (EditText) findViewById(R.id.lanuageCode);
    m_etApiKeyFiled = (EditText) findViewById(R.id.apiKey);
    m_etApiKeyFiled.setText("T7GNRh7VmH");
    final Button m_btnPickImage = (Button) findViewById(R.id.picImagebutton);
    m_btnPickImage.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            // Starting image picker activity
            startActivityForResult(
                    new Intent(
                            Intent.ACTION_PICK,
                            android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI),
                    IMAGE_PICKER_REQUEST);
        }
    });
    final Button m_btnConvertText = (Button) findViewById(R.id.convert);
    m_btnConvertText.setOnClickListener(this);
}
public void onClick(View p_v) {
    m_apiKey = m_etApiKeyFiled.getText().toString();
    m_langCode = m_etLangCodeField.getText().toString();
    // Checking are all fields set
    if (m_fileName != null && !m_apiKey.equals("")
            && !m_langCode.equals("")) {
        final ProgressDialog m_prgDialog = ProgressDialog.show(
                SampleActivity.this, "Loading ...", "Converting to text.",
                true, false);
        final Thread m_thread = new Thread(new Runnable() {
            public void run() {
                final OCRServiceAPI m_apiClient = new OCRServiceAPI(
                        m_apiKey);
                m_apiClient.convertToText(m_langCode, m_fileName);
                // Doing UI related code in UI thread
                runOnUiThread(new Runnable() {
                    public void run() {
                        m_prgDialog.dismiss();
                        // Showing response dialog
                        final AlertDialog.Builder m_alert = new AlertDialog.Builder(
                                SampleActivity.this);
                        m_alert.setMessage(m_apiClient.getResponseText());
                        m_alert.setPositiveButton("OK",
                                new DialogInterface.OnClickListener() {
                                    public void onClick(
                                            DialogInterface p_dialog,
                                            int p_id) {
                                    }
                                });
                        // Setting dialog title related from response code
                        if (m_apiClient.getResponseCode() == RESPONSE_OK) {
                            m_alert.setTitle("Success");
                        } else {
                            m_alert.setTitle("Faild");
                        }
                        m_alert.show();
                    }
                });
            }
        });
        m_thread.start();
    } else {
        Toast.makeText(SampleActivity.this, "All data are required.",
                Toast.LENGTH_SHORT).show();
    }
}
@Override
protected void onActivityResult(int p_requestCode, int p_resultCode,
        Intent p_data) {
    super.onActivityResult(p_requestCode, p_resultCode, p_data);
    if (p_requestCode == IMAGE_PICKER_REQUEST && p_resultCode == RESULT_OK) {
        m_fileName = getRealPathFromURI(p_data.getData());
        m_tvPicNameText.setText("Selected: en"
                + getStringNameFromRealPath(m_fileName));
    }
}
/*
 * Returns image real path.
 */
private String getRealPathFromURI(final Uri p_contentUri) {
    final String[] m_proj = { MediaStore.Images.Media.DATA };
    final Cursor m_cursor = managedQuery(p_contentUri, m_proj, null, null,
            null);
    int m_columnIndex = m_cursor
            .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    m_cursor.moveToFirst();
    return m_cursor.getString(m_columnIndex);
}
/*
 * Cuts selected file name from real path to show in screen.
 */
private String getStringNameFromRealPath(final String bucketName) {
    return bucketName.lastIndexOf('/') > 0 ? bucketName
            .substring(bucketName.lastIndexOf('/') + 1) : bucketName;
}   }

Answer 3

默认情况下，Android中并非所有Apache软件包都可用，因此您必须从Apache存储库下载它们并自行包含它们。请参阅问题Android libraries not found以及答案中提供的链接。

编辑：具体来说，org.apache.http.entity的子包不包含在内，只包含实体包本身。

在OCR API提供的示例项目中，他们将mime包放在jar in the lib folder中。

如何在android中使用OCR从图像中读取文本

3 个答案: