Android™ Requires Chilkat v11.7.0+

Extract the Values of PDF Form Fields

See more PDF Text Extraction Examples

Demonstrates the "formFields" filter. The values of AcroForm fields (text fields, choices, check boxes) are not part of the page's text and are left out by default; "include" places each value at its field's position in the reading order, where a label capture can pick it up. Android™

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    //  The filled-in form used in this example is available at filled_form.pdf

    CkPdf pdf = new CkPdf();
    success = pdf.LoadFile("qa_data/pdf/filled_form.pdf");
    if (success == false) {
        Log.i(TAG, pdf.lastErrorText());
        return;
        }

    CkJsonObject json = new CkJsonObject();
    CkJsonObject jsonOut = new CkJsonObject();

    //  By default only the page's own text is returned: the captions, without the values typed into the fields.
    json.UpdateString("layout","lines");
    success = pdf.ExtractText("text",json,jsonOut);
    if (success == false) {
        Log.i(TAG, pdf.lastErrorText());
        return;
        }

    Log.i(TAG, "---- default ----");
    Log.i(TAG, jsonOut.stringOf("text"));

    //  With formFields included, each field's value appears where the field is on the page.
    //  A checked check box appears as [x]; an unchecked one has no value.
    json.UpdateString("formFields","include");
    success = pdf.ExtractText("text",json,jsonOut);
    if (success == false) {
        Log.i(TAG, pdf.lastErrorText());
        return;
        }

    Log.i(TAG, "---- formFields: include ----");
    Log.i(TAG, jsonOut.stringOf("text"));

    //  A field value can be captured by the caption beside it, as for any other text.
    json.UpdateString("label","Email");
    success = pdf.ExtractText("text",json,jsonOut);
    if (success == false) {
        Log.i(TAG, pdf.lastErrorText());
        return;
        }

    Log.i(TAG, "Email: " + jsonOut.stringOf("text"));

    //  Sample output:

    //  ---- default ----
    //  Membership Application
    //  Name:
    //  Email:
    //  Phone:
    //  Newsletter: Yes, send me the monthly newsletter
    //  Volunteer: I am willing to volunteer
    //  ---- formFields: include ----
    //  Membership Application
    //  Name: Dana Whitfield
    //  Email: dana.whitfield@example.com
    //  Phone: 555-0142
    //  Newsletter: [x] Yes, send me the monthly newsletter
    //  Volunteer: I am willing to volunteer
    //  Email: dana.whitfield@example.com

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}