If-else doesn't work properly with my check box

I have a grid in my application and when I select an item it load the items prospectively. I want to allow to select the check box only when isMayoBaseAvailable returns true.

This is the code I used, when I used this code and debug it work correctly, but when I run the application and check it always go inside the false (In all the items). Why does it happens?

I have shown my logcat as well.

@Override
    public void onTaskCompleted(JSONArray responseJson) {

        try {
            List<String> crust = new ArrayList<String>();
            List<String> descriptionHalf = new ArrayList<String>();
            final List<String> description = new ArrayList<String>();
            List<String> extraDescription = new ArrayList<String>();

            for (int i = 0; i < responseJson.length(); ++i) {
                JSONObject object = responseJson.getJSONObject(i);

                if ((object.getString("MainCategoryID")).equals("1")) {
                    Log.i("Description ", object.getString("Description"));
                    descriptionHalf.add(object.getString("Description"));

                    Log.i("IsMayoBaseAvailable",
                            object.getString("IsMayoBaseAvailable"));

                    String isMayoBaseAvailable = object
                            .getString("IsMayoBaseAvailable");

                    mayoBaseCB = (CheckBox) findViewById(R.id.ch_mayobase);
                    if (isMayoBaseAvailable.contains("true")) {
                        mayoBaseCB.setEnabled(true);
                    } else {
                        mayoBaseCB.setEnabled(false);
                    }

                    JSONArray subMenuArray = object
                            .getJSONArray("SubMenuEntity");

                    for (int j = 0; j < subMenuArray.length(); ++j) {
                        JSONObject subMenuObject = subMenuArray
                                .getJSONObject(j);
                        Log.i("Crust", subMenuObject.getString("Crust"));
                        crust.add(subMenuObject.getString("Crust"));

                        Log.i("Description",
                                subMenuObject.getString("Description"));
                        description.add(subMenuObject.getString("Description"));

                        JSONArray extraItemEntityArray = subMenuObject
                                .getJSONArray("ExtraItemEntity");

                        for (int k = 0; k < extraItemEntityArray.length(); k++) {
                            JSONObject objectE = extraItemEntityArray
                                    .getJSONObject(k);

                            if ((objectE.getString("Description")) != null
                                    && (objectE.getString("Type")).equals("E")) {

                                extraDescription.add(objectE
                                        .getString("Description"));
                            }
                        }

                    }
                    // mayoBaseCB.setEnabled(false);
                }

Logcat shows some items has isMayoBaseAvailable as true and some has as false.