[尝试获取Firestore数据库实例时获取NoClassDefFoundError

Question

我正在尝试获取Cloud Firestore数据库的引用，但出现以下错误

Java.Lang.NoClassDefFoundError：无法解决以下问题：Lcom / google / common / base / Preconditions;

我已经阅读了所有文档，并尽我所能检查。

• 我已经在我的项目中添加了Xamarin.Google.Guava包
• 已启用Multidex，已清理并重建解决方案
• 我不使用Proguard
• FirebaseApp不为空
• 我将GoogleServicesJson的构建操作更改为None，并手动构建了FirebaseApp选项，但结果相同

以下是包裹清单

Xamarin.Android.Support.Design {28.0.0.1}Xamarin.Firebase.Firestore {71.1705.0}Xamarin.Google.Guava {27.1.0.2}

这是我的GetDatabase方法

public FirebaseFirestore GetDatabase()
        {
            FirebaseFirestore data_base;
            var app = FirebaseApp.InitializeApp(Application.Context);
            if (app == null)
            {
                var options = new FirebaseOptions.Builder()
                .SetProjectId("deliveryapp-254615")
                .SetApplicationId("deliveryapp-254615")
                .SetApiKey("AIzaSyD9HOqiYHFLsT4RspeZyElbhhqq5tNBXPs")
                .SetDatabaseUrl("https://deliveryapp-254615.firebaseio.com")
                .SetStorageBucket("deliveryapp-254615.appspot.com")
                .Build();

                app = FirebaseApp.InitializeApp(Application.Context, options);
            }

            data_base = FirebaseFirestore.GetInstance(app);

            return data_base
        }

以下是调试日志

10-03 19:08:39.154 D/FirebaseApp(28559): com.google.firebase.iid.FirebaseInstanceId is not linked. Skipping initialization.
10-03 19:08:39.155 D/FirebaseApp(28559): com.google.firebase.crash.FirebaseCrash is not linked. Skipping initialization.
10-03 19:08:39.156 D/FirebaseApp(28559): com.google.android.gms.measurement.AppMeasurement is not linked. Skipping initialization.
10-03 19:08:39.180 I/zygote  (28559): Rejecting re-init on previously-failed class java.lang.Class<com.google.firebase.firestore.FirebaseFirestore$2>: java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/common/base/Function;
10-03 19:08:39.180 I/zygote  (28559):   at void mono.android.view.View_OnClickListenerImplementor.n_onClick(android.view.View) (View_OnClickListenerImplementor.java:-2)
10-03 19:08:39.180 I/zygote  (28559):   at void mono.android.view.View_OnClickListenerImplementor.onClick(android.view.View) (View_OnClickListenerImplementor.java:30)
10-03 19:08:39.180 I/zygote  (28559):   at boolean android.view.View.performClick() (View.java:6297)
10-03 19:08:39.180 I/zygote  (28559):   at void android.view.View$PerformClick.run() (View.java:24797)
10-03 19:08:39.180 I/zygote  (28559):   at void android.os.Handler.handleCallback(android.os.Message) (Handler.java:790)
10-03 19:08:39.180 I/zygote  (28559):   at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:99)
10-03 19:08:39.180 I/zygote  (28559):   at void android.os.Looper.loop() (Looper.java:164)
10-03 19:08:39.180 I/zygote  (28559):   at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6626)
10-03 19:08:39.180 I/zygote  (28559):   at java.lang.Object java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) (Method.java:-2)
10-03 19:08:39.180 I/zygote  (28559):   at void com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run() (RuntimeInit.java:438)
10-03 19:08:39.180 I/zygote  (28559):   at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:811)
10-03 19:08:39.180 I/zygote  (28559): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.common.base.Function" on path: DexPathList[[zip file "/data/app/com.Voidron.Delivery_DemoApp-d9Ckk53XN-uid0HuJbaR0A==/base.apk"],nativeLibraryDirectories=[/data/app/com.Voidron.Delivery_DemoApp-d9Ckk53XN-uid0HuJbaR0A==/lib/arm, /data/app/com.Voidron.Delivery_DemoApp-d9Ckk53XN-uid0HuJbaR0A==/base.apk!/lib/armeabi-v7a, /system/lib, /system/vendor/lib]]
10-03 19:08:39.180 I/zygote  (28559):   at java.lang.Class dalvik.system.BaseDexClassLoader.findClass(java.lang.String) (BaseDexClassLoader.java:125)
10-03 19:08:39.180 I/zygote  (28559):   at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String, boolean) (ClassLoader.java:379)
10-03 19:08:39.180 I/zygote  (28559):   at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String) (ClassLoader.java:312)

Answer 1

我设法使用https://github.com/xamarin/GooglePlayServicesComponents/issues/258的输入解决了这个问题>

[我所做的只是将番石榴的软件包降级到27.1.0.0，这似乎解决了问题