Android™ Requires Chilkat v11.7.0+

Replace the Value After a Label in a PDF (Re-issue an Invoice)

See more PDF Text Replacement Examples

Demonstrates replacing the values that follow labels such as "Invoice Number:" on a PDF that has no placeholders -- an ordinary invoice. Each entry of the "labels" array names a label as it appears on the page and the new value; the value replaces the rest of the label's line. Label matching ignores case, extra spaces and a trailing colon. The replaced text is read back with ExtractText to confirm it. 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 PDF used in this example is available at invoice_labels.pdf

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

    //  The invoice has lines such as "Invoice Number:   INV-2026-0412" and "Total Due:  $1,234.53".
    //  Each label's new value replaces whatever follows the label on its line.
    CkJsonObject json = new CkJsonObject();
    json.UpdateString("labels[0].label","Invoice Number:");
    json.UpdateString("labels[0].value","INV-2026-0500");
    json.UpdateString("labels[1].label","Invoice Date:");
    json.UpdateString("labels[1].value","April 2, 2026");
    json.UpdateString("labels[2].label","customer");
    json.UpdateString("labels[2].value","Contoso Ltd");
    json.UpdateString("labels[3].label","Total Due:");
    json.UpdateString("labels[3].value","$1,999.99");

    CkJsonObject jsonOut = new CkJsonObject();
    success = pdf.TextReplace("apply",json,jsonOut);
    if (success == false) {
        Log.i(TAG, "Not applied: " + jsonOut.emit());
        if (success == false) {
            Log.i(TAG, pdf.lastErrorText());
            return;
            }

        }

    int i = 0;
    int count_i = jsonOut.SizeOfArray("replacements");
    while (i < count_i) {
        jsonOut.put_I(i);
        Log.i(TAG, "Replaced the value of \"" + jsonOut.stringOf("replacements[i].label") + "\" on page " + jsonOut.stringOf("replacements[i].pages"));
        i = i + 1;
        }

    success = pdf.WriteFile("qa_output/invoice_reissued.pdf");
    if (success == false) {
        Log.i(TAG, pdf.lastErrorText());
        return;
        }

    //  Read the new values back with ExtractText's label option.
    CkJsonObject jsonRead = new CkJsonObject();
    CkJsonObject jsonText = new CkJsonObject();
    jsonRead.UpdateString("label","Total Due");
    jsonRead.UpdateString("labelValue","right");
    success = pdf.ExtractText("text",jsonRead,jsonText);
    if (success == false) {
        Log.i(TAG, pdf.lastErrorText());
        return;
        }

    Log.i(TAG, "Total Due is now: " + jsonText.stringOf("text"));

    //  Sample output:

    //  Replaced the value of "Invoice Number:" on page 1
    //  Replaced the value of "Invoice Date:" on page 1
    //  Replaced the value of "customer" on page 1
    //  Replaced the value of "Total Due:" on page 1
    //  Total Due is now: $1,999.99

  }

  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."
  }
}