java Google Analytics v4无法转换为Analytics
我尝试在我的应用程序中实现谷歌分析。
问题是我收到了LogCat
的信息:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.name.appname/com.name.appname.activity.MainActivity}: java.lang.ClassCastException: com.name.appname.misc.AppApplication cannot be cast to com.name.appname.activity.Analytics
全球跟踪系统。xml
<integer name="ga_sessionTimeout">300</integer>
<!-- Enable automatic Activity measurement -->
<bool name="ga_autoActivityTracking">true</bool>
<!-- Enable verbose logging -->
<String name="ga_loglevel">verbose</String>
<!-- Screen names on the reports -->
<screenName name="com.name.appname.activity.MainActivity">
MainActivity ScreenView
</screenName>
<!-- Tracking ID -->
<string name="ga_trackingId">UA-xxxxxxx-2</string>
分析。java:
public class Analytics extends Application {
public static int GENERAL_TRACKER = 0;
public enum TrackerName {
APP_TRACKER, // Tracker used only in this app.
GLOBAL_TRACKER, // Tracker used by all the apps from a company. eg: roll-up tracking.
ECOMMERCE_TRACKER, // Tracker used by all ecommerce transactions from a company.
}
HashMap<TrackerName, Tracker> mTrackers = new HashMap<TrackerName, Tracker>();
synchronized Tracker getTracker(TrackerName trackerId) {
if (!mTrackers.containsKey(trackerId)) {
GoogleAnalytics analytics = GoogleAnalytics.getInstance(this);
Tracker t = analytics.newTracker(R.xml.global_tracker);
mTrackers.put(trackerId, t);
}
return mTrackers.get(trackerId);
}
}
清单:
<application
安卓:allowBackup="true"
安卓:icon="@drawable/ic_launcher"
安卓:label="@string/app_name"
安卓:theme="@style/AppTheme"
安卓:name=".misc.AppApplication" >
<activity
安卓:name=".activity.Analytics"
安卓:allowBackup="true"
安卓:label="@string/app_name"
安卓:screenOrientation="portrait" >
</activity>
main活动:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
adView = (AdView) this.findViewById(R.id.adView);
// Get tracker.
Tracker tracker = ((Analytics)getApplication()).getTracker(Analytics.TrackerName.GLOBAL_TRACKER);
tracker.send(new HitBuilders.EventBuilder()
.setCategory("Use")
.setAction("Use Programm")
.setLabel("submit")
.build());
@Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
GoogleAnalytics.getInstance(MainActivity.this).reportActivityStart(this);
}
@Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
GoogleAnalytics.getInstance(MainActivity.this).reportActivityStop(this);
}
在我的清单中,我已经在申请时声明了安卓:name=".misc.AppApplication"
。这是我的支票
这是我的杂项。应用程序:
import 安卓.app.Application;
public class AppApplication extends Application {
private boolean mIsPremium;
public void setPremium(){
mIsPremium = true;
}
public boolean isPremium(){
return mIsPremium;
}
}
问题出在哪里
# 1 楼答案
您正在将清单中应用程序元素的name属性设置为“.misc.AppApplication”。这指示Android进行实例化。杂项。AppApplication类作为应用程序而不是默认应用程序。在你的主要活动课上,你试着施展。杂项。应用于分析,这将引发ClassCastException
正确的设置是用Analytics(扩展Android应用程序类的类)替换应用程序类,并将MainActivity保留为实现主要活动的类
您也不应该从onCreate override记录事件。可以出于启动应用程序以外的原因创建活动。例如,当设备从横向模式更改为纵向模式时,Android将要求活动将其状态保存到一个捆绑包中,将其拆下并通过savedInstanceState中保存的状态重新创建。在这种情况下,将再次调用onCreate