java - 无法在adListener中使用sharedPreference

我想在用户关闭/离开特定片段时投放插页式广告。为此，我运行了一种方法，在showIntAd()中显示onDetach()测试广告可以正常显示
Log.i(TAG, "Ad closed");运行正常，但是如果我尝试putInt或getInt之后的所有代码将无法执行。
基本上我想将一个int值0保存到我的sharedPreference中，if onAdClosed()运行

插页式广告的创建和加载，以及onCreate中的sharedPreference的初始化

        mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
        mEditor = mSharedPreferences.edit();

        mInterstitialAd_Arcade = new InterstitialAd(getActivity());
        mInterstitialAd_Arcade.setAdUnitId(getString(R.string.interstitial_ads_test_id));
        AdRequest adRequest = new AdRequest.Builder().build();
        mInterstitialAd_Arcade.loadAd(adRequest);

在分离

 @Override
public void onDetach(){
    super.onDetach();
    showIntAd();
}

广告展示方法

private void showIntAd(){
            int interstitial_counter =
            mSharedPreferences.getInt(getString(R.string.pref_arcade_interstitial_counter), 0);
            if (interstitial_counter >= 15){
                if (mInterstitialAd_Arcade.isLoaded()) {
                    mInterstitialAd_Arcade.show();
                }
                    mInterstitialAd_Arcade.setAdListener(new AdListener(){
                    @Override
                    public void onAdOpened(){
                        Log.i(TAG, "Ad opened");
                    }

                    @Override
                    public void onAdFailedToLoad(int errorCode){
                        Log.e(TAG,  "Ad Failed to load: " + errorCode);
                    }
                    @Override
                    public void onAdClosed(){
                        Log.i(TAG, "Ad closed");
                        mEditor.putInt(getString(R.string.pref_arcade_interstitial_counter), 0);
                        mEditor.apply();
                    }
                });
            }
        }

最佳答案

问题是sharedPreference没有任何值（空）。
试试这个方法

private void showIntAd(){
            int interstitial_counter =
            mSharedPreferences.getInt(getString(R.string.pref_arcade_interstitial_counter), 0);
            if (interstitial_counter ==null) {
                   if (mInterstitialAd_Arcade.isLoaded()) {
                    mInterstitialAd_Arcade.show();
                }
              }
            if (interstitial_counter >= 15){
                if (mInterstitialAd_Arcade.isLoaded()) {
                    mInterstitialAd_Arcade.show();
                }

                //move the listener inside oncreate .
            }
        }