java - 不能在 adListener 中使用 sharedPreference

Question

我想在用户关闭/离开特定 fragment 时转换插页式广告。为此，我在 onDetach() 中运行了一个方法 showIntAd() 测试广告显示得很好
Log.i(TAG, "Ad closed"); 运行良好，但如果我尝试 putInt 或 getInt 之后的所有代码都赢了'执行。
基本上，我想将一个值为 0 的 int 保存到我的 sharedPreference，如果 onAdClosed() 运行

创建和加载插页式广告，并在 onCreate 中启动 sharedPreference

        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);

分离时

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

展示广告的方式

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();
                    }
                });
            }
        }

Answer 1

问题是 sharedPreference 没有任何值(null)。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 .
            }
        }