Android Open Source - tribunaldroid Get Captcha Task

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License

The source code is released under:

GNU General Public License

Java Source Code

package hu.nxu.tribunaldroid.networkComm;
//w  w w. j  a  v  a2 s. c  o m
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import android.R;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.AsyncTask;

public class GetCaptchaTask extends AsyncTask<String, Byte, byte[] >{
  private Activity callerActivity;
  private String[] messages;
  
  /**
   * Initializes a new instance of the GetCaptchaTask class.
   * @param activity Instance of the caller activity.
   */
  public GetCaptchaTask(Activity activity) {
    this.callerActivity = activity;
    this.messages = this.callerActivity.getResources().getStringArray(this.callerActivity.getResources().getIdentifier("", "array", this.callerActivity.getPackageName()));
  }
  
  /**
   * Gets a captcha asynchronously.
   */
  @Override
  protected byte[] doInBackground(String... params) {
    ConnectionManager cm = ConnectionManager.getInstance();
    
    // Get a ReCaptcha challenge key
    String json;
    try {
      json = new String(cm.get("https://www.google.com/recaptcha/api/challenge?ajax=1&lang=en&k=" + params[0]), "UTF-8");
    } catch (Exception ex) {
      this.showErrorMessage(this.messages[Integer.parseInt(ex.getMessage())]);
      return null;
    }
    
    // Extract the challenge key
    Pattern pattern = Pattern.compile("challenge : '([a-zA-Z0-9\\-_]+)'");
    Matcher matcher = pattern.matcher(json);
    if (!matcher.matches()) {
      this.showErrorMessage(this.messages[3]);
      return null;
    }
    // Get the image from the challenge key
    
    
    return null;
  }

  /**
   * Shows an error message in an alert dialog.
   * @param message Message to show.
   */
  protected void showErrorMessage(String message) {
    
    // 1. Instantiate an AlertDialog.Builder with its constructor
    AlertDialog.Builder builder = new AlertDialog.Builder(this.callerActivity);

    // 2. Chain together various setter methods to set the dialog characteristics
    builder.setMessage(message)
           .setTitle("Error")
           .setPositiveButton("OK", new DialogInterface.OnClickListener() {
               public void onClick(DialogInterface dialog, int id) {
                   dialog.cancel();
               }
           });
    // 3. Get the AlertDialog from create()
    AlertDialog dialog = builder.create();
    dialog.show();
  }
}

Java Source Code List

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