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。请告诉我如何从活动中创建跟踪器对象。

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): 
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):

Answer 1

<强>原因：
getApplication返回的对象为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

<强>解决方案：
如果您的清单不包含application element

，则可能会导致此问题

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

Google Analytics - 活动中的跟踪器对象

1 个答案: