Android™

Find and Delete Object from JSON Array

See more JSON Examples

Demonstrates how to find an delete an object from a JSON array of objects. 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 will delete the "Pasta" category object from Menu B.

    // {
    //   "menus": [
    //     {
    //       "name": "Menu A",
    //       "categories": [
    // 			{
    // 			"name": "Kebabs",
    // 			"description": "blah blah blah"
    // 			},
    // 			{
    // 			"name": "Burgers",
    // 			"description": "blah blah blah"
    // 			},
    // 			{
    // 			"name": "Pasta",
    // 			"description": "blah blah blah"
    // 			},
    // 			{
    // 			"name": "Appetizers",
    // 			"description": "blah blah blah"
    // 			}
    // 		]
    // 	},
    //     {
    //       "name": "Menu B",
    //       "categories": [
    // 			{
    // 			"name": "Kebabs",
    // 			"description": "blah blah blah"
    // 			},
    // 			{
    // 			"name": "Burgers",
    // 			"description": "blah blah blah"
    // 			},
    // 			{
    // 			"name": "Pasta",
    // 			"description": "blah blah blah"
    // 			},
    // 			{
    // 			"name": "Appetizers",
    // 			"description": "blah blah blah"
    // 			}
    // 		]
    // 	  }
    // 	]
    // }

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

    // Find Menu B.
    CkJsonObject menu = json.FindRecord("menus","name","Menu B",true);
    // assume menu is found..

    // Get the categories array, and then find the index of the "Pasta" menu category.
    CkJsonArray catArr = menu.ArrayOf("categories");
    // Assume it is found..

    // Find the object where the name of the JSON member is "name", and the value is "Pasta"
    int index = catArr.FindObject("name","Pasta",true);
    if (index < 0) {
        Log.i(TAG, "Pasta not found.");
        }
    else {

        // Delete the "Pasta" category record from Menu B
        success = catArr.DeleteAt(index);
        // Assume OK..
        }

    // Examine the JSON to see if it worked as expected..
    json.put_EmitCompact(false);
    Log.i(TAG, json.emit());


  }

  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."
  }
}