Android Open Source - PhotoOCR_for_Android Main Activity

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Back to project page PhotoOCR_for_Android.

License

The source code is released under:

MIT License

Java Source Code

package com.aspose.tutorials.example20140607;
/*from www . j av a 2 s . c om*/
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Scanner;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

import org.json.JSONException;
import org.json.JSONObject;

import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.util.Base64;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class MainActivity extends ActionBarActivity {

  public class OcrTask extends AsyncTask<File, Void, String> {
    String requestUrl;
    String appSID = "875775bc-8a52-49ba-8c65-7f4bdfa6802e";
    String appKey = "e96db89a723710c76878a67b5e8c21bf";

    @Override
    protected void onPreExecute() {
      super.onPreExecute();

      requestUrl = "https://api.aspose.com/v1.1/ocr/recognize?appSID="
          + appSID;
      try {
        Mac mac = Mac.getInstance("HmacSHA1");
        mac.init(new SecretKeySpec(appKey.getBytes(), "HmacSHA1"));
        mac.update(requestUrl.getBytes());
        String signature = Base64.encodeToString(mac.doFinal(),
            Base64.NO_PADDING);
        requestUrl += "&signature=" + signature;
        Log.w(MainActivity.class.getName(), requestUrl);
      } catch (Exception x) {
        throw new RuntimeException(x);
      }
    }

    @Override
    protected String doInBackground(File... params) {

      File file = params[0];
      HttpURLConnection connection = null;
      try {
        FileInputStream fstream = new FileInputStream(file);
        int fsize = fstream.available();

        connection = (HttpURLConnection) new URL(requestUrl)
            .openConnection();
        connection.setRequestMethod("POST");
        connection.setDoOutput(true);
        connection.setRequestProperty("Accept", "application/json");
        connection.setRequestProperty("Content-Length",
            String.valueOf(fsize));

        OutputStream upload = connection.getOutputStream();
        byte[] buffer = new byte[10240];
        int len;
        while ((len = fstream.read(buffer)) != -1) {
          upload.write(buffer, 0, len);
        }
        upload.close();
        fstream.close();

        InputStream i = connection.getInputStream();
        String text = new Scanner(i).useDelimiter("\\A").next();
        i.close();

        file.delete();

        return text;
      } catch (FileNotFoundException fnfx) {
        InputStream e = connection.getErrorStream();
        String text = new Scanner(e)
            .useDelimiter("\\A").next();
        Log.e("aspose", text);

        return text;
      } catch (Exception x) {
        throw new RuntimeException(x);
      }
    }

    @Override
    protected void onPostExecute(String result) {
      super.onPostExecute(result);

      Log.e(OcrTask.class.getName(), result);

      String text = "";
      try {
        JSONObject json = new JSONObject(result);
        if (json.has("Status") && json.getString("Status").equals("OK")) {
          text = json.getString("Text");
        } else if (json.has("Message")) {
          text = "Error: " + json.getString("Message");
        }
      } catch (JSONException x) {
        throw new RuntimeException(x);
      }

      displayTextResults(text);
    }
  }

  protected static final int REQUEST_IMAGE_CAPTURE = 1;
  File tmpfile = null;

  @Override
  protected void onActivityResult(int request, int result, Intent data) {
    if (request == REQUEST_IMAGE_CAPTURE && result == RESULT_OK) {
      

//      if (data.hasExtra(MediaStore.EXTRA_OUTPUT)) {        
//        Log.w("aspose", "==============MediaStore.EXTRA_OUTPUT===========");
//      }
      
        if (tmpfile == null) {
            Log.e("onActivityResult", "Photo was not saved. Doing nothing");
        }

      new OcrTask().execute(tmpfile);

      displayTextResults("Uploading photo and recognizing text. This may take a few seconds.");
    }
  }

  protected void displayTextResults(String text) {
    TextView t = (TextView) findViewById(R.id.text_results);
    t.setText(text);

  }

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

  }

  @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;
  }

  public void captureImage(View view) {
    Intent intCaptureImage = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

    if (intCaptureImage.resolveActivity(getPackageManager()) != null) {
      try {
        // tmpfile = File.createTempFile("photo", null, getCacheDir());
        tmpfile = File.createTempFile("Photo", ".jpg", Environment .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES));
      } catch (IOException x) {
        Log.e("aspose", "no way to save the file");
        // We are lost :)
        finish();
      }
      intCaptureImage.putExtra(MediaStore.EXTRA_OUTPUT,
          Uri.fromFile(tmpfile));
      startActivityForResult(intCaptureImage, REQUEST_IMAGE_CAPTURE);

    }

  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
      return true;
    }
    return super.onOptionsItemSelected(item);
  }

  /**
   * A placeholder fragment containing a simple view.
   */
  public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
      View rootView = inflater.inflate(R.layout.fragment_main, container,
          false);
      return rootView;
    }
  }

}

Java Source Code List

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