用户进行应用内购买时删除广告

我正在尝试实现应用内结算API，并在用户购买“删除广告”应用内商品时使我的应用没有广告。问题是我不确定该在哪里做。我有一个FAB按钮，并且在linierlayout中的adview像这样：

并在用户购买它后立即将adview可见性设置为GONE，这样FAB按钮就会关闭。

这是我的主要活动代码：

public class MainActivity extends AppCompatActivity {
private static final String TAG =  MainActivity.class.getSimpleName();
private Toolbar mToolbar;
private RecyclerView mRecyclerView;
private ArrayList<String> shoppingListItems;
private SharedPreferences mSharedPreferences;
private SharedPreferences.Editor mEditor;
private TextView mEmptyTextView;
private ShoppingListAdapter adapter;
private ActionButton actionButton;
private MaterialDialog addItemdialog = null;
private IabHelper mHelper;
private String SKU_REMOVE_ADDS = "remove_adds_sku";
private boolean mIsRemoveAdds = false;
private IabHelper.OnIabPurchaseFinishedListener mPurchasedFinishedListener = new IabHelper.OnIabPurchaseFinishedListener() {
    @Override
    public void onIabPurchaseFinished(IabResult result, Purchase purchase) {
        if (result.isFailure()) {
            Log.d(TAG, "Error purchasing: " + result);
            return;
        }
        else if (purchase.getSku().equals(SKU_REMOVE_ADDS)) {
            // consume the gas and update the UI
            mIsRemoveAdds = true;
            Toast.makeText(MainActivity.this,"Purchase successful",Toast.LENGTH_LONG).show();
        }
    }
};


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //load ads
    AdView mAdView = (AdView) findViewById(R.id.adView);
    AdRequest adRequest = new AdRequest.Builder().build();
    mAdView.loadAd(adRequest);
//set up billing
    String publicKey = "PUBLIC_KEY";

    mHelper = new IabHelper(this,publicKey);
    mHelper.startSetup(new IabHelper.OnIabSetupFinishedListener() {
        @Override
        public void onIabSetupFinished(IabResult result) {
            if(!result.isSuccess()){
                //error
                Log.d(TAG,"Proglem setting up in-app Billing: " + result);
            }

            //Horay, IAB is fully set up!
            Log.d(TAG,"Horay, IAB is fully set up!");
        }
    });
    queryPurchasedItems();
}
 @Override
protected void onResume() {
    super.onResume();
    isListEmpty();
    queryPurchasedItems();
}
@Override
protected void onDestroy() {
    super.onDestroy();
    if (mHelper != null) mHelper.dispose();
    mHelper = null;
}
private void queryPurchasedItems() {
    //check if user has bought "remove adds"
    IabHelper.QueryInventoryFinishedListener mGotInventoryListener = new IabHelper.QueryInventoryFinishedListener() {
        @Override
        public void onQueryInventoryFinished(IabResult result, Inventory inventory) {
            if (result.isFailure()) {
                // handle error here
            }
            else{
                // does the user have the premium upgrade?
                mIsRemoveAdds = inventory.hasPurchase(SKU_REMOVE_ADDS);
                // update UI accordingly
            }
        }
    };
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if(id == R.id.action_remove_adds){
        mHelper.launchPurchaseFlow(this,SKU_REMOVE_ADDS,1,mPurchasedFinishedListener,"");
    }
return super.onOptionsItemSelected(item);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    Log.d(TAG, "onActivityResult(" + requestCode + "," + resultCode + "," + data);

    // Pass on the activity result to the helper for handling
    if (!mHelper.handleActivityResult(requestCode, resultCode, data)) {
        // not handled, so handle it ourselves (here's where you'd
        // perform any handling of activity results not related to in-app
        // billing...
        //setContentView(R.layout.activity_main_adds);
        super.onActivityResult(requestCode, resultCode, data);
    }
    else {
        Log.d(TAG, "onActivityResult handled by IABUtil.");
        //setContentView(R.layout.activity_main_adds);
    }
}