GoogleAnalytics android getActivity().getApplication()无法转换为AnalyticsApplication

Question

这是我收到错误的代码

@Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        // Obtain the shared Tracker instance.
        AnalyticsApplication application = (AnalyticsApplication) getActivity().getApplication();
        mTracker = application.getDefaultTracker();
}

这是我的AnalyticsApplication类

package auc.games2.Analytics;
/*
 * Copyright Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


        import android.app.Application;

        import com.google.android.gms.analytics.GoogleAnalytics;
        import com.google.android.gms.analytics.Logger;
        import com.google.android.gms.analytics.Tracker;

        import auc.games2.R;

/**
 * This is a subclass of {@link Application} used to provide shared objects for this app, such as
 * the {@link Tracker}.
 */
public class AnalyticsApplication extends Application {
    private Tracker mTracker;

    /**
     * Gets the default {@link Tracker} for this {@link Application}.
     * @return tracker
     */
    synchronized public Tracker getDefaultTracker() {
        if (mTracker == null) {
            GoogleAnalytics analytics = GoogleAnalytics.getInstance(this);
            // To enable debug logging use: adb shell setprop log.tag.GAv4 DEBUG
            mTracker = analytics.newTracker(R.xml.global_tracker);
        }
        return mTracker;
    }
}

这是logcat上的错误

03-09 18:46:11.070 32602-32602/auc.games2.multigame1 E/AndroidRuntime:FATAL EXCEPTION:main java.lang.ClassCastException:android.app.Application无法转发到auc上的auc.games2.Analytics.AnalyticsApplication.在Android.app的android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1035)上的android.app.FragmentManagerImpl.moveToState(FragmentManager.java:843)中的games2.UI.Fragments.inicial.onViewCreated(ini​​cial.java:127) .BackStackRecord.run(BackStackRecord.java:635)位于android.app.Handler.handleCallback的android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1399)android.app.FragmentManagerImpl $ 1.run(FragmentManager.java:426) (Handler.java:615)android.app.Handler.dispatchMessage(Handler.java:92)android.app.Looper.loop(Looper.java:137)android.app.ActivityThread.main(ActivityThread.java: 4867)at java.lang.reflect.Method.invokeNative(Native Method)at java.lang.reflect.Method.invoke(Method.java:511)at com.android.internal.os.ZygoteInit $ MethodAndA rgsCaller.run(ZygoteInit.java:1007)位于dalvik.system.NativeStart.main(本地方法)的com.android.internal.os.ZygoteInit.main(ZygoteInit.java:774)

Answer 1

您的AndroidManifest.xml文件不包含您的自定义Application子类,因此Android使用默认的一个(android.app.Application).

android:name="auc.games2.Analytics.AnalyticsApplication"向<application>元素添加属性.