Google Analytics - 活动中的跟踪器对象

Question

我正在从活动中创建Google Analytics跟踪器对象.问题是我在this.getApplication()上执行的强制转换操作中出错.请告诉我如何从Activity创建跟踪器对象.

public void sengToGoogleAnalytics() {
    Tracker t = ((AnalyticsSampleApp) this.getApplication()).getTracker(TrackerName.APP_TRACKER);
    t.setScreenName(getString(R.string.memoryhome));
    t.send(new HitBuilders.AppViewBuilder().build());
} 

日志

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): 
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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): 
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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): 

Answer 1

原因:
getApplication返回的对象是android.app.Application抛出ClassCastException,如logcat中的以下行所示

06-11 11:49:59.510:E/AndroidRuntime(2917):引起:java.lang.ClassCastException:android.app.Application无法强制转换为kids.animals.fruits.objects.brain.puzzle.memory.game. free.AnalyticsSampleApp06-11

解决方案:
如果清单不包含应用程序元素,则可能导致此问题

<application android:name=".YourApplication"...
</application>