Android™ Requires Chilkat v11.7.0+

Replace the Second (or Every) Occurrence of a Label in a PDF

See more PDF Text Replacement Examples

Demonstrates the "occurrence" member of a label entry. By default the first occurrence of a label, in reading order across the selected pages, is replaced; "occurrence" can be a number for the nth, or "all" for every occurrence. The invoice template has "Ref:" twice. 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_template.pdf

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

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

    //  This template's {{placeholders}} are not being filled here: "keep" leaves them as they are
    //  (the default, "error", would refuse to apply while a placeholder on the page has no value).
    json.UpdateString("unusedPlaceholders","keep");

    //  "Ref:" appears twice on the page (A-1 near the top, A-2 below the totals).
    //  The default replaces the first occurrence only.
    json.UpdateString("labels[0].label","Ref:");
    json.UpdateString("labels[0].value","B-7");
    success = pdf.TextReplace("check",json,jsonOut);
    if (success == false) {
        Log.i(TAG, pdf.lastErrorText());
        return;
        }

    Log.i(TAG, "default: " + String.valueOf(jsonOut.IntOf("replacements[0].count")) + " occurrence replaced");

    //  The second occurrence only.
    json.UpdateString("labels[0].occurrence","2");
    success = pdf.TextReplace("check",json,jsonOut);
    if (success == false) {
        Log.i(TAG, pdf.lastErrorText());
        return;
        }

    Log.i(TAG, "occurrence 2: " + String.valueOf(jsonOut.IntOf("replacements[0].count")) + " occurrence replaced");

    //  Every occurrence.
    json.UpdateString("labels[0].occurrence","all");
    success = pdf.TextReplace("apply",json,jsonOut);
    if (success == false) {
        Log.i(TAG, pdf.lastErrorText());
        return;
        }

    Log.i(TAG, "occurrence all: " + String.valueOf(jsonOut.IntOf("replacements[0].count")) + " occurrences replaced");

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

    //  Sample output:

    //  default: 1 occurrence replaced
    //  occurrence 2: 1 occurrence replaced
    //  occurrence all: 2 occurrences replaced

  }

  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."
  }
}