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：致命异议：主要 java.lang.ClassCastException：无法转换android.app.Application 到auc.games2.Analytics.AnalyticsApplication at auc.games2.UI.Fragments.inicial.onViewCreated（inicial.java:127）在 android.app.FragmentManagerImpl.moveToState（FragmentManager.java:843）在 android.app.FragmentManagerImpl.moveToState（FragmentManager.java:1035）在android.app.BackStackRecord.run（BackStackRecord.java:635）在 android.app.FragmentManagerImpl.execPendingActions（FragmentManager.java:1399）在android.app.FragmentManagerImpl $ 1.run（FragmentManager.java:426）在android.os.Handler.handleCallback（Handler.java:615）在android.os.Handler.dispatchMessage（Handler.java:92）在android.os.Looper.loop（Looper.java:137）在android.app.ActivityThread.main（ActivityThread.java:4867） at java.lang.reflect.Method.invokeNative（Native Method）在java.lang.reflect.Method.invoke（Method.java:511）在 com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:1007）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:774）在dalvik.system.NativeStart.main（本地方法）

Answer 1

您的AndroidManifest.xml文件不包含自定义Application子类，因此Android使用默认值（android.app.Application）。

在android:name="auc.games2.Analytics.AnalyticsApplication"元素中添加<application>属性。

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

1 个答案: