Android™

JSON: Nested Array

See more JSON Examples

Here we have a JSON object that contains nested arrays. This example demonstrates how to access the contents of the nested arrays.

{
 "numbers" : [ 
    ["even", 2, 4, 6, 8], 
    ["prime", 2, 3, 5, 7, 11, 13] 
  ] }

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;

    CkJsonObject json = new CkJsonObject();

    // This is the above JSON with whitespace chars removed (SPACE, TAB, CR, and LF chars).
    // The presence of whitespace chars for pretty-printing makes no difference to the Load
    // method. 
    String jsonStr = "{ \"numbers\" : [ [\"even\", 2, 4, 6, 8], [\"prime\", 2, 3, 5, 7, 11, 13] ] }";

    success = json.Load(jsonStr);
    if (success != true) {
        Log.i(TAG, json.lastErrorText());
        return;
        }

    // Get the value of the "numbers" object, which is an array that contains JSON arrays.
    CkJsonArray outerArray = json.ArrayOf("numbers");
    if (json.get_LastMethodSuccess() == false) {
        Log.i(TAG, "numbers array not found.");
        return;
        }

    int numArrays = outerArray.get_Size();
    int i;

    for (i = 0; i <= numArrays - 1; i++) {

        CkJsonArray innerArray = outerArray.ArrayAt(i);

        // The first item in the innerArray is a string
        Log.i(TAG, innerArray.stringAt(0) + ":");

        int numInnerItems = innerArray.get_Size();
        int j;
        for (j = 1; j <= numInnerItems - 1; j++) {

            Log.i(TAG, "  " + String.valueOf(innerArray.IntAt(j)));

            }

        }


  }

  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."
  }
}