Android™

Demonstrates how to Handle Large Integers in JSON

See more JSON Examples

Demonstrates how to handle large integers in JSON. (Integers larger than what can fit in a 32-bit signed integer.) 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;

    // Let's say your JSON has this:

    // {
    // 	"id": 20000000001234567
    // }

    CkJsonObject json = new CkJsonObject();

    success = json.LoadFile("qa_data/json/large_int.json");
    if (success == false) {
        Log.i(TAG, json.lastErrorText());
        return;
        }

    // The integer is too large for a 32-bit signed integer that is returned by IntOf.
    // The result will be something that wrapped around and could be negative.
    // In this case it would be: -543893881
    int id = json.IntOf("id");
    Log.i(TAG, "id: " + String.valueOf(id));

    // The solution is to read the integer value as a string, and then use the features in your programming language
    // to convert from a string to a 64-bit integer.
    // 
    // Alternatively, you may wish to simply hold the value as a string.  If, for example, the integer simply references
    // an order ID, an account ID, etc., then there's no need to convert to an integer value.  You're not going to be doing
    // mathematical operations on it anyway.  This is usually the case for large integers -- they typically exist
    // in JSON as an account ID.

    // You can get any JSON value as a string:
    String accountId = json.stringOf("id");
    Log.i(TAG, "accountId: " + accountId);

    // Sample output:

    // id: -543893881
    // accountId: 20000000001234567

  }

  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."
  }
}