Async Function Needs Context

[RewindJAA]

[Edit: I think I am asking, how do you access the calling Context in an Async callback function that has just got the Sku details?]

I have an async callback function within another function (onSkuDetailsResponse)

public void querySkuDetailsAsync(@BillingClient.SkuType final String itemType, final List<String> skuList){
    // Query the purchase async
    SkuDetailsParams.Builder params = SkuDetailsParams.newBuilder();
    params.setSkusList(skuList).setType(itemType);
    mBillingClient.querySkuDetailsAsync(params.build(),
                                                                       new SkuDetailsResponseListener() {
               @Override
               public void onSkuDetailsResponse(BillingResult response,  List<SkuDetails> skuDetailsList) {

Note 'public void onSkuDetailsResponse' is the async function in question.

Within it I cycle through the Skus:

for (SkuDetails skuDetails : skuDetailsList) {
    String Sku, Title, Description, Price;
    Sku = skuDetails.getSku();
    Title = skuDetails.getTitle();
    Description = skuDetails.getDescription();
    Price = skuDetails.getPrice();
    MyIAPProduct.setSkuDetails(productsDetailsARR, getApplicationContext(), Sku, Title, Description, Price);
}

NOTE: The function `MyIAPProduct.setSkuDetails` saves the Sku's detail to preferences.

If I put 'this' where getApplicationContext() is, it turns red as 'this' at that point in time is the SkuDetailsReponseListener and not the Context within which this function is written.

So I put 'getApplicationContext()' as shown in the code, because I thought that would be the right thing to do.

However, when 'MyIAPProduct.setSkuDetails' runs (see code)

public static void setSkuDetails(ArrayList<MyIAPProduct> arr, Context cnt,
                                 String Sku, String Title, String Description, String Price)
{
    for(MyIAPProduct prod: arr){
        if(Sku.equals(prod.m_Sku)) {
            prod.setSkuDetails(cnt, Title, Description, Price);
        }
    }
}

and 'setSkuDetails' for the individual object is run:

public void setSkuDetails(Context cnt, String Title, String Description, String Price)
{
    m_Title = Title;
    m_Description = Description;
    m_Price = Price;
    saveToPreferences(cnt);
}

Then when it runs the function 'saveToPreferences' for the individual object:

public void saveToPreferences(Context cnt){
    SharedPreferences sharedPref = ((Activity) cnt).getPreferences(Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = sharedPref.edit();
    editor.putBoolean(m_Sku + "Purchased", m_Purchased);
    editor.putString(m_Sku + "Title", m_Title);
    editor.putString(m_Sku + "Description", m_Description);
    editor.putString(m_Sku + "Price", m_Price);
    editor.commit();
}

the program crashed on the line

    SharedPreferences sharedPref = ((Activity) cnt).getPreferences(Context.MODE_PRIVATE);

where the Context is first used.

Can anyone explain why?

Can anyone explain what I need to do to get it working as I hope?