不能够引用（（MainActivity）getApplication（））了解getTracker（MainActivity.TrackerName.APP_TRACKER）。 [英] Not able to reference ((MainActivity) getApplication()).getTracker(MainActivity.TrackerName.APP_TRACKER);

问题描述

我想谷歌分析在我的应用集成及继起的这里的教程一切都设置：

我有延伸活动，并贴有标签3片段，我初始化code在这一活动的MainActivity这样的：

 私有静态最后弦乐PROPERTY_ID =UA-XXXXXX;    //日志TAG
    私有静态最后弦乐TAG =MyApp的;    公共静态INT GENERAL_TRACKER = 0;    公共枚举TrackerName {
        APP_TRACKER，
        GLOBAL_TRACKER，
        ECOMMERCE_TRACKER，
    }    HashMap的＆LT; TrackerName，跟踪＆GT; mTrackers =新的HashMap＆LT; TrackerName，跟踪＆GT;（）;    公共MainActivity（）{
        超（）;
    }    同步跟踪了解getTracker（TrackerName trackerId）{
        如果（！mTrackers.containsKey（trackerId））{            Google分析分析= GoogleAnalytics.getInstance（本）;
            跟踪T =（trackerId == TrackerName.APP_TRACKER）？ analytics.newTracker（R.xml.app_tracker）
                    （trackerId == TrackerName.GLOBAL_TRACKER）？ analytics.newTracker（PROPERTY_ID）
                            ：analytics.newTracker（R.xml.ecommerce_tracker）;
                    mTrackers.put（trackerId，T）;        }
        返回mTrackers.get（trackerId）;
    }
 

现在的标签之一，我试图做的：

 （（MainActivity）getApplication（））了解getTracker（MainActivity.TrackerName.APP_TRACKER）。
 

不过，我得到以下内容：

无法从应用程序转换为MainActivity在code以上线。任何提示吗？我试图用它的片段具有以下签名：

 公共类FragmentTab1扩展片段
 

解决方案

如果你调用这个片段里，也许你需要调用getActivity呢？

 （（MainActivity）getActivity（））了解getTracker（MainActivity.TrackerName.APP_TRACKER）。
 

I am trying to integrate Google Analytics in my application and following a tutorial from here Everything is setup:

I have a MainActivity which extends Activity and has three Tab Fragments attached, I initialize the code in this Activity like:

private static final String PROPERTY_ID = "UA-xxxxxx";

    //Logging TAG
    private static final String TAG = "MyApp";

    public static int GENERAL_TRACKER = 0;

    public enum TrackerName {
        APP_TRACKER, 
        GLOBAL_TRACKER, 
        ECOMMERCE_TRACKER,
    }

    HashMap<TrackerName, Tracker> mTrackers = new HashMap<TrackerName, Tracker>();

    public MainActivity() {
        super();
    }

    synchronized Tracker getTracker(TrackerName trackerId) {
        if (!mTrackers.containsKey(trackerId)) {

            GoogleAnalytics analytics = GoogleAnalytics.getInstance(this);
            Tracker t = (trackerId == TrackerName.APP_TRACKER) ? analytics.newTracker(R.xml.app_tracker)
                    : (trackerId == TrackerName.GLOBAL_TRACKER) ? analytics.newTracker(PROPERTY_ID)
                            : analytics.newTracker(R.xml.ecommerce_tracker);
                    mTrackers.put(trackerId, t);

        }
        return mTrackers.get(trackerId);
    }

Now in one of the Tabs I am trying to do:

((MainActivity) getApplication()).getTracker(MainActivity.TrackerName.APP_TRACKER);

However I get the following:

Cannot cast from Application to MainActivity in the above line of code. Any hints? The fragment I am trying to use it in has the following signature:

public class FragmentTab1 extends Fragment

解决方案

If you are calling this inside the fragment, perhaps you need to call getActivity instead?

((MainActivity) getActivity()).getTracker(MainActivity.TrackerName.APP_TRACKER); 

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