LauncherActivity中的ClasscastException

Question

我在啓動我的應用程序時遇到ClasscastException，問題出在TaxiTwinApplication app =（TaxiTwinApplication）getApplication（）;這是我試圖從其它類調用方法中的活性甲

公共類LauncherActivity延伸活動{

@Override 
public void onCreate(Bundle icicle) { 
    super.onCreate(icicle); 
    Intent intent; 
    TaxiTwinApplication app = (TaxiTwinApplication)getApplication(); 
    app.register(); 
    switch (TaxiTwinApplication.getUserState()) { 
     case NOT_SUBSCRIBED: 
     case SUBSCRIBED: 
      intent = new Intent(this, MainActivity.class); 
      intent.addFlags(FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_CLEAR_TASK); 
      break; 
     case PARTICIPANT: 
      intent = new Intent(this, MyTaxiTwinActivity.class); 
      intent.addFlags(FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_CLEAR_TASK); 
      break; 
     case OWNER: 
      intent = new Intent(this, MyTaxiTwinActivity.class); 
      intent.addFlags(FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_CLEAR_TASK); 
      break; 
     default: 
      intent = new Intent(this, MainActivity.class); 
      intent.addFlags(FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_CLEAR_TASK); 
    } 
    startActivity(intent); 
    finish(); 
} 

}

公共類TaxiTwinApplication延伸申請{

private static int pendingNotificationsCount = 0; 
private static UserState userState = NOT_SUBSCRIBED; 
private ServicesManagement servicesManagement; 
private LocationListener locationListener; 

@Override 
public void onCreate() { 
    super.onCreate(); 
} 

public void unregister() { 
    LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 
    locationManager.removeUpdates(locationListener); 
} 

public void register() { 
    servicesManagement = new ServicesManagement(this); 
    locationListener = new LocationListener() { 
     public void onLocationChanged(Location location) { 
      locationUpdate(location); 
     } 

     public void onStatusChanged(String provider, int status, Bundle extras) { 
     } 

     public void onProviderEnabled(String provider) { 
      LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 
      if (ActivityCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { 
       // TODO: Consider calling 
       // ActivityCompat#requestPermissions 
       // here to request the missing permissions, and then overriding 
       // public void onRequestPermissionsResult(int requestCode, String[] permissions, 
       //           int[] grantResults) 
       // to handle the case where the user grants the permission. See the documentation 
       // for ActivityCompat#requestPermissions for more details. 
       return; 
      } 
      locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 10000, 3, this); 
     } 

     public void onProviderDisabled(String provider) { 
     } 
    }; 
    //every 10 seconds and at least 3 meters 
    LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 10000, 3, locationListener); 
} 

private void locationUpdate(Location location) { 
    GcmHandler gcmHandler = new GcmHandler(this); 
    gcmHandler.locationChanged(location); 
} 

public static int getPendingNotificationsCount() { 
    return pendingNotificationsCount; 
} 

public static void setPendingNotificationsCount(int pendingNotifications) { 
    pendingNotificationsCount = pendingNotifications; 
} 

public static UserState getUserState() { 
    return userState; 
} 

public static void setUserState(UserState userState) { 
    TaxiTwinApplication.userState = userState; 
} 

public static void exit(Context context) { 
    GcmHandler gcmHandler = new GcmHandler(context); 
    if (userState == UserState.OWNER || userState == UserState.PARTICIPANT) { 
     gcmHandler.leaveTaxiTwin(); 
    } 
    gcmHandler.unsubscribe(); 

    TaxiTwinApplication app = (TaxiTwinApplication) context.getApplicationContext(); 
    app.unregister(); 

    DbHelper dbHelper = new DbHelper(context); 
    dbHelper.deleteTables(dbHelper.getWritableDatabase()); 
    android.os.Process.killProcess(android.os.Process.myPid()); 
} 

}

Answer 1

<application 
    android:icon="@mipmap/ic_launcher" 
    android:label="@string/app_name" 
    android:name="com....TaxiTwinApplication">