Android™

JSON: Access Array Values

See more JSON Examples

Demonstrates how to access values in a JSON array. 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();

    String jsonStr = "{ \"id\": 1, \"name\": \"A green door\", \"tags\": [\"home\", 22, \"green\"], \"price\": 125 }";

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

    // Get the "tags" array, which contains "home", 22, "green"
    CkJsonArray tagsArray = json.ArrayOf("tags");
    if (json.get_LastMethodSuccess() == false) {
        Log.i(TAG, "tags member not found.");
        return;
        }

    // Get the value at each array index. 
    // Output will be:
    // [0] = home
    // [0] as integer = 0
    // [1] = 22
    // [1] as integer = 22
    // [2] = green
    // [2] as integer = 0

    int arraySize = tagsArray.get_Size();
    int i;
    for (i = 0; i <= arraySize - 1; i++) {

        String sValue = tagsArray.stringAt(i);

        Log.i(TAG, "[" + String.valueOf(i) + "] = " + sValue);

        int iValue = tagsArray.IntAt(i);
        Log.i(TAG, "[" + String.valueOf(i) + "] as integer = " + String.valueOf(iValue));

        }

    // Note: The StringAt method returns the value as a string regardless of the type.

    // The IntAt method returns the value as an integer.  If the value does not convert to 
    // an integer, then 0 is returned

  }

  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."
  }
}