Question

我试图按照此处描述的内容：https://developers.google.com/tag-manager/android/v4/#init这就是我所拥有的：

TagManager tagManager = TagManager.getInstance(this);
    tagManager.setVerboseLoggingEnabled(true);


    PendingResult<ContainerHolder> pending =
            tagManager.loadContainerPreferNonDefault("GTM-XXXXXX",
                    R.raw.gtm);


    pending.setResultCallback(new ResultCallback<ContainerHolder>() {
        @Override
        public void onResult(ContainerHolder containerHolder) {
            ContainerHolderSingleton.setContainerHolder(containerHolder);
            container = containerHolder.getContainer();
            Log.d("NICK","Inside onResult...") ;
            if (!containerHolder.getStatus().isSuccess()) {
                Log.e("CuteAnimals", "failure loading container");

                return;
            }

            ContainerLoadedCallback.registerCallbacksForContainer(container);
            containerHolder.setContainerAvailableListener(new ContainerLoadedCallback());

        }
    }, 3000, TimeUnit.MILLISECONDS);


    Log.d("NICK","Value: "+container.getString("test_value));

正在发生的事情是上面NullPointerException行的Log，因为container为空：

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.nick.app/com.nick.app.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.google.android.gms.tagmanager.Container.getString(java.lang.String)' on a null object reference
                                                                     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
                                                                     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
                                                                     at android.app.ActivityThread.-wrap11(ActivityThread.java)
                                                                     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
                                                                     at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                     at android.os.Looper.loop(Looper.java:148)
                                                                     at android.app.ActivityThread.main(ActivityThread.java:5422)
                                                                     at java.lang.reflect.Method.invoke(Native Method)
                                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
                                                                  Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.google.android.gms.tagmanager.Container.getString(java.lang.String)' on a null object reference

我为Google代码管理器启用了日志记录，我觉得我看起来像＃34;正常＆＃34;行为：

05-16 11:53:04.865 22585-22662/com.nick.app V/GoogleTagManager: Deleted 0 expired items
05-16 11:53:04.867 22585-22585/com.nick.app V/GoogleTagManager: Attempting to load a container from the resource ID 2131034112 (com.nick.app:raw/gtm)
05-16 11:53:04.888 22585-22585/com.nick.app V/GoogleTagManager: The container was successfully loaded from the resource (using JSON file format)
05-16 11:53:04.903 22585-22664/com.nick.app V/GoogleTagManager: Attempting to load resource from disk
05-16 11:53:04.925 22585-22664/com.nick.app V/GoogleTagManager: loadAfterDelay: containerId=GTM-XXXXXXX delay=40721307
05-16 11:53:04.925 22585-22664/com.nick.app D/GoogleTagManager: Setting previous container version: NQ$0
05-16 11:53:04.929 22585-22664/com.nick.app V/GoogleTagManager: The Disk resource was successfully read.

并且我的onResult中的日志语句也从未显示过，这可以解释为什么container为空，因为这是任何初始化发生的唯一位置。不应该onResult到达并container被初始化吗？我对如何正确实施这一点感到有些困惑。

Answer 1

加载ContainerHolder是异步发生的，因此在您当前尝试记录值时，尚未为其分配值。

您关联的网站包含以下关于onResult()的文档。

只要满足下列条件之一，就会调用onResult方法   发生的情况：


已加载已保存的容器

如果没有保存的容器，则加载网络容器

发生指定的超时

这意味着在调用container之后才能访问onResult(...)，因为这是为其分配值。您可以将日志语句移动到该方法中以测试检索值，并在此时执行您需要对容器执行的任何其他操作。

public void onResult(ContainerHolder containerHolder) {
    ContainerHolderSingleton.setContainerHolder(containerHolder);
    container = containerHolder.getContainer();

    Log.d("NICK","Inside onResult...") ;
    if (!containerHolder.getStatus().isSuccess()) {
        Log.e("CuteAnimals", "failure loading container");
        return;
    }

    ContainerLoadedCallback.registerCallbacksForContainer(container);
    containerHolder.setContainerAvailableListener(new ContainerLoadedCallback());

    // do whatever you want with the container at this point
    Log.d("NICK","Value: " + container.getString("test_value));
}

Google跟踪代码管理器null容器

1 个答案: