[英]Xamarin Android app works on emulator, crashes on real device when using WebRequest
[英]Xamarin forms, App running on Visual Studio Android Emulator But crashes on real device
我创建了一个应用程序,当构建应用程序时,它可以在 Visual Studio 模拟器上完美运行。 因此,我创建了构建版本并尝试在我的物理 android 设备上运行该应用程序。 我在设备上收到以下错误消息。 我用过Xam.plugin.media
android.runtime.JavaProxyThrowable:System.NullReferenceException:对象引用未设置为 Xamarin.Forms.Platform.Android.FormsAppCompatActivity.InternalSetPage(Xamarin.Forms.Page 页面)中的对象实例:0 在 Xamarin.Forms .Platform.Android.FormsAppCompatActivity.SetMainPage () [0x0000c] in :0 at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.LoadApplication (Xamarin.Forms.Application application) [0x0025c] in :0 at InterestMatch.Droid.MainActivity.OnCreate (Android.OS.Bundle 包) [0x00033] 在 <9e2a066af7c24de6828dc3a0f4e22d31>:0 在 Android.Support.V4.App.FragmentActivity.n_OnCreate_Landroid_os_Bundle_ (System.IntPtr jnienv, System.Int0Pnative.Intr0Pnative_snative.Intr0pnative.Intr0npnative.Intr0.0.0 1e89c43d3c7d48b5ba69bfc0b1bdf114>:0在(包装纸动态方法)System.Object的:在md5ed93386354f0e17f050b2885712023ca.MainActivity.n_onCreate(本机方法)6b534aff-3541-46f2-a92e-ac0022b9c4a7(IntPtr的,IntPtr的,IntPtr的)在md5ed93386354f0e17f050b2885 712023ca.MainActivity.onCreate(MainActivity.java:29) at android.app.Activity.performCreate(Activity.java:6303) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108) at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2402) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2509) at android.app.ActivityThread.access$1000(ActivityThread.java:153) at android.app.ActivityThread$H.handleMessage(ActivityThread) .java:1373) 在 android.os.Handler.dispatchMessage(Handler.java:102) 在 android.os.Looper.loop(Looper.java:154) 在 android.app.ActivityThread.main(ActivityThread.java:5523)在 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739) 在 com.android.internal.os.ZygoteInit.main(ZygoteInit.爪哇:629)
这是我的代码
主Activity.cs
public class MainActivity global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
protected override void OnCreate(Bundle bundle)
{
TabLayoutResource = Resource.Layout.Tabbar;
ToolbarResource = Resource.Layout.Toolbar;
Plugin.CurrentActivity.CrossCurrentActivity.Current.Activity = this;
base.OnCreate(bundle);
global::Xamarin.Forms.Forms.Init(this, bundle);
LoadApplication(new App());
}
public override void OnRequestPermissionsResult(int requestCode, string[] permissions, Android.Content.PM.Permission[] grantResults)
{
PermissionsImplementation.Current.OnRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
应用程序.xaml.cs
using InterestMatch.Inter;
using InterestMatch.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Xamarin.Auth;
using Xamarin.Forms;
namespace InterestM
{
public partial class App : Application
{
public static string AppName { get { return "StoreAccountInfoApp"; } }
public static ICredentialsService CredentialsService { get; private set; }
public App ()
{
var account = AccountStore.Create().FindAccountsForService(App.AppName).FirstOrDefault();
CredentialsService = new CredentialsService();
if (CredentialsService.DoCredentialsExist())
{
InitializeComponent();
MainPage = new NavigationPage(new InterestM.MainMenu(account.Username.ToString()));
}
else
{
InitializeComponent();
MainPage = new NavigationPage(new InterestM.Accounts.Login());
}
}
protected override void OnStart ()
{
// Handle when your app starts
}
protected override void OnSleep ()
{
// Handle when your app sleeps
}
protected override void OnResume ()
{
// Handle when your app resumes
}
}
}
更改 Android 项目选项为我解决了这个问题。
打开您的 Android 项目的属性。 转到 Android 选项。 将 Linking 属性更改为"Sdk Assemblies Only" 。
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