问题
I am creating the Google Analytics Tracker object from an Activity. The issue is that I am getting an error in the cast operation done on this.getApplication(). Please let me know how to create a tracker object from an Activity.
public void sengToGoogleAnalytics() {
Tracker t = ((AnalyticsSampleApp) this.getApplication()).getTracker(TrackerName.APP_TRACKER);
t.setScreenName(getString(R.string.memoryhome));
t.send(new HitBuilders.AppViewBuilder().build());
}
Log
06-11 11:49:59.510: E/AndroidRuntime(2917): FATAL EXCEPTION: main06-11 11:49:59.510: E/AndroidRuntime(2917): java.lang.RuntimeException: Unable to start activity ComponentInfo{kids.animals.fruits.objects.brain.puzzle.memory.game.free/kids.animals.fruits.objects.brain.puzzle.memory.game.free.MemoryHome}: java.lang.ClassCastException: android.app.Application cannot be cast to kids.animals.fruits.objects.brain.puzzle.memory.game.free.AnalyticsSampleApp06-11 11:49:59.510: E/AndroidRuntime(2917):
06-11 11:49:59.510: E/AndroidRuntime(2917): java.lang.RuntimeException: Unable to start activity ComponentInfo{kids.animals.fruits.objects.brain.puzzle.memory.game.free/kids.animals.fruits.objects.brain.puzzle.memory.game.free.MemoryHome}: java.lang.ClassCastException: android.app.Application cannot be cast to kids.animals.fruits.objects.brain.puzzle.memory.game.free.AnalyticsSampleApp06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917):
06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917):
06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917):
06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917):
06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917):
06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917):
06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917):
06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917):
06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917):
06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917):
06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917):
06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917): Caused by: java.lang.ClassCastException: android.app.Application cannot be cast to kids.animals.fruits.objects.brain.puzzle.memory.game.free.AnalyticsSampleApp
06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917): Caused by: java.lang.ClassCastException: android.app.Application cannot be cast to kids.animals.fruits.objects.brain.puzzle.memory.game.free.AnalyticsSampleApp06-11 11:49:59.510: E/AndroidRuntime(2917):
06-11 11:49:59.510: E/AndroidRuntime(2917): Caused by: java.lang.ClassCastException: android.app.Application cannot be cast to kids.animals.fruits.objects.brain.puzzle.memory.game.free.AnalyticsSampleApp06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917):
06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917):
06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917):
06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917):
06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917):
06-11 11:49:59.510: E/AndroidRuntime(2917): 06-11 11:49:59.510: E/AndroidRuntime(2917):
06-11 11:49:59.510: E/AndroidRuntime(2917):
回答1:
Cause:
The object returned by getApplication is android.app.Application, which throws a ClassCastException, as indicated by the following line in the logcat
06-11 11:49:59.510: E/AndroidRuntime(2917): Caused by: java.lang.ClassCastException: android.app.Application cannot be cast to kids.animals.fruits.objects.brain.puzzle.memory.game.free.AnalyticsSampleApp06-11
Solution:
This can be caused if your manifest doesn't contain the application element
<application android:name=".YourApplication"...
</application>
来源：https://stackoverflow.com/questions/24155928/google-analytics-tracker-object-from-activity