Xamarin android 应用程序在恢复时崩溃

Question

显然我们的 Xamarin 原生应用在一段时间未使用后有时会在 Android 上崩溃，但我无法重现它。

崩溃似乎是在我们的选项卡式应用程序中对其中一个片段进行充气时引起的。知道这可能是什么吗？报告仅适用于 Android 7，尽管该应用的用户很少，因此可能是巧合。该应用程序以 Android 7.0 为目标，但以前当应用程序将目标框架设置为 android 6.0 时，错误是相同的（有几行不同）。有点运气谷歌搜索。

2017 年 11 月 17 日更新：我已尝试捕获异常（尝试围绕 BuildingListFragment 看到的 2 行代码块）并抛出我自己的异常，但它没有被捕获，并且在 google play 中出现了相同的异常控制台崩溃报告。这对我来说仍然是一个问题，我们将不胜感激。

android.runtime.JavaProxyThrowable: at AlarmKeeper.Droid.BuildingListFragment.OnCreateView (Android.Views.LayoutInflater inflater, Android.Views.ViewGroup container, Android.OS.Bundle savedInstanceState) [0x00028] in <8584c8930bb24ecaa4ab45fc24b599b6>:0
at Android.Support.V4.App.Fragment.n_OnCreateView_Landroid_view_LayoutInflater_Landroid_view_ViewGroup_Landroid_os_Bundle_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_inflater, System.IntPtr native_container, System.IntPtr native_savedInstanceState) [0x00020] in <1e89c43d3c7d48b5ba69bfc0b1bdf114>:0
at (wrapper dynamic-method) System.Object:fc5b2ba7-0fe0-4b23-b87c-c512566cc5f6 (intptr,intptr,intptr,intptr,intptr)
at md5446876e046c50288069676734a083198.BuildingListFragment.n_onCreateView (Native Method)
at md5446876e046c50288069676734a083198.BuildingListFragment.onCreateView (BuildingListFragment.java:30)
at android.support.v4.app.Fragment.performCreateView (Fragment.java:2248)
at android.support.v4.app.FragmentManagerImpl.moveToState (FragmentManager.java:1340)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState (FragmentManager.java:1569)
at android.support.v4.app.FragmentManagerImpl.moveToState (FragmentManager.java:1636)
at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated (FragmentManager.java:2977)
at android.support.v4.app.FragmentController.dispatchActivityCreated (FragmentController.java:192)
at android.support.v4.app.FragmentActivity.onStart (FragmentActivity.java:603)
at android.support.v7.app.AppCompatActivity.onStart (AppCompatActivity.java:178)
at android.app.Instrumentation.callActivityOnStart (Instrumentation.java:1256)
at android.app.Activity.performStart (Activity.java:6972)
at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2937)
at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:3045)
at android.app.ActivityThread.-wrap14 (ActivityThread.java)
at android.app.ActivityThread$H.handleMessage (ActivityThread.java:1642)
at android.os.Handler.dispatchMessage (Handler.java:102)
at android.os.Looper.loop (Looper.java:154)
at android.app.ActivityThread.main (ActivityThread.java:6776)
at java.lang.reflect.Method.invoke (Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:1520)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1410)

片段类：

public class BuildingListFragment : Fragment
{
    ...

    public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        base.OnCreateView(inflater, container, savedInstanceState);
        var view = inflater.Inflate(Resource.Layout.BuildingListFragment, container, false);

        ...
    }
...
}

适配器：

public class TabAdapter : FragmentPagerAdapter, IconPagerAdapter
{
    private MainActivity _context;

    public TabAdapter (MainActivity context, FragmentManager p0) : base(p0)
    {
        _context = context;
    }

    public override Fragment GetItem(int position)
    {
        switch (position) {
        case 0:
            return new BuildingListFragment ();
        case 1:
            return AlarmListFragment.NewInstance("active");
        case 2:
            return AlarmListFragment.NewInstance("confirmed");
        case 3:
            return new ProfileFragment();
        }

        return null;
    }

    public override int Count
    {
        get{ return 4; }
    }

    ...
}

主活动：

    private TabAdapter _adapter;
    private ViewPager _viewPager;

    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);

        ...

            _viewPager = FindViewById<ViewPager>(Resource.Id.main_view_pager);
            _adapter = new TabAdapter(this, SupportFragmentManager);
            _viewPager.Adapter = _adapter;
            _viewPager.AddOnPageChangeListener(this);

            _tabLayout = FindViewById<TabLayout>(Resource.Id.main_tab_layout);
            TabLayoutHelper.SetupWithViewPager(_tabLayout, _viewPager);

            var activeItem = Intent.GetIntExtra(ArgActiveFragment, 0);
            if (activeItem != 0)
            {
                _viewPager.SetCurrentItem(activeItem, false);
            }

BuildingListFragment.axml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:gravity="center"
    android:background="@color/background">
    <LinearLayout
        android:id="@+id/error_container"
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:background="@color/red"
        android:gravity="center"
        android:visibility="gone">
        <TextView
            android:id="@+id/error_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="@color/white"
            android:textSize="16dp" />
    </LinearLayout>
    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/building_list_refresh"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:minWidth="25px"
            android:minHeight="25px"
            android:clickable="true">
            <ListView
                android:id="@+id/building_list"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:paddingTop="15dp"
                android:clipToPadding="false"
                android:divider="@color/light_grey"
                android:dividerHeight="1dp" />
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textStyle="normal"
                android:textSize="15dp"
                android:gravity="center"
                android:text="@string/no_buildings_in_list"
                android:id="@+id/no_buildings_text"
                android:textColor="@color/grey"
                android:layout_gravity="center" />
        </FrameLayout>
    </android.support.v4.widget.SwipeRefreshLayout>
</LinearLayout>

Answer 1

不确定您是否对此仍有疑问，但我在遇到类似问题时发现了此线程；启用“不保留活动”选项后，我无法发生崩溃，但我设法通过将“后台进程限制”选项设置为“最多 1 个进程”来解决该问题。