我想在 Android 中实现 OCR。 IE。从名片图像中获取文本。我使用了来自here的代码。
但是当我运行这段代码时，我得到了以下错误：
java.lang.NoClassDefFoundError: org.apache.http.entity.mime.content.FileBody
我认为它指向以下行：
final FileBody image = new FileBody(new File(filePath));
属于OCRServiceAPI 类。我该如何解决这个问题？
【问题讨论】：
无法猜测您的上述错误，但我已经在 Blackberry 中通过在 PHP上使用 OCR 的第三方应用程序 ABBYY 产品完成了这项任务> 服务器。
在我长期的研发过程中，我还研究了Github_Abbyy 的以下链接。 要使用此代码，您应该在这里创建一个免费帐户：ocrsdk.com
【讨论】：
并非所有 Apache 软件包都默认在 Android 中可用，因此您必须从 Apache 存储库下载它们并自己包含这些软件包。请参阅问题Android libraries not found 以及那里的答案中提供的链接。
编辑：具体不包括org.apache.http.entity的子包，只包括实体包本身。
在 OCR API 给出的示例项目中，他们将 mime 包放在了 jar in the lib folder 中。
【讨论】：
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;
} }
【讨论】：