小编Adi*_*Adi的帖子

我正在扩展 Application 类并初始化 admob，如下所示：

    public class MyApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        MobileAds.initialize(getApplicationContext(), getString(R.string.admob_app_id));
    }
}

但是 MobileAds.initialize 方法在我的 moto e2（API 23）中崩溃，而在我的 op3t（API 26）中工作正常。以下是崩溃的堆栈竞争：

I/DynamiteModule: Considering local module com.google.android.gms.ads.dynamite:0 and remote module com.google.android.gms.ads.dynamite:11020
I/DynamiteModule: Selected remote version of com.google.android.gms.ads.dynamite, version >= 11020
D/DynamitePackage: Instantiated singleton DynamitePackage.
D/DynamitePackage: Instantiating com.google.android.gms.ads.ChimeraMobileAdsSettingManagerCreatorImpl
V/ConnectivityManager: isActiveNetworkMetered() returns:false
I/WebViewFactory: Loading com.google.android.webview version 71.0.3578.99 (code 357809900)
I/cr_LibraryLoader: Time to load native libraries: 2 ms (timestamps 315-317)
I/chromium: [INFO:library_loader_hooks.cc(36)] Chromium logging enabled: level = …

这是我的布局 xml：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/fragment_body"
android:fitsSystemWindows="true">

<include
    android:id="@+id/contextToolBar"
    layout="@layout/context_toolbar_layout" />

<android.support.v7.widget.RecyclerView
    android:id="@+id/list1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_below="@+id/contextToolBar"
    android:scrollbarSize="5dp"
    android:scrollbarThumbVertical="@color/scrollbarColor"
    android:scrollbars="vertical"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />

<ProgressBar
    android:id="@+id/delete_progress"
    style="@style/Widget.AppCompat.ProgressBar"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    android:visibility="gone" />

它在回收视图中显示图像网格。我可以选择一堆图像并可以选择删除它们。以下是删除逻辑：

public void deleteSelectedFiles(final Context context, final List<MediaModel> selectionList) {

    String confirmationMessage = getString(R.string.delete_confirm_message);

    new AlertDialog.Builder(context)
            .setTitle(getString(R.string.action_delete))
            .setMessage(confirmationMessage)
            .setIcon(android.R.drawable.ic_dialog_alert)
            .setPositiveButton(android.R.string.yes, (dialog, whichButton) -> {
                View progressBar = getActivity().findViewById(R.id.delete_progress);
                dialog.cancel();
                progressBar.setVisibility(View.VISIBLE);

                deleteFileList(selectionList, this.getActivity());

                progressBar.setVisibility(View.GONE);
            })
            .setNegativeButton(android.R.string.no, null).show();
}

我希望在删除操作进行时进度条显示在前台。但它只是不显示。任何帮助将不胜感激。