RequestPermissionsAsync 永远不会返回

Question

我正在使用 Xamarin Forms 的权限插件。 当我调用 RequestPermissionsAsync 时，调用似乎永远卡住了。永远不会调用下一行。 我正在按照文档进行正确的设置。 那是我的代码

var 结果 = await CrossPermissions.Current.RequestPermissionsAsync(Permission.Location, Permission.Camera, Permission.Microphone, Permission.Storage);

Console.WriteLine(result) //这条线永远不会被调用

下面是清单

<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="28" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS" />
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="com.commonground.streetdeploy.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.BATTERY_STATS" />
<uses-feature android:name="android.hardware.location" android:required="false" />
<uses-feature android:name="android.hardware.location.gps" android:required="false" />
<uses-feature android:name="android.hardware.location.network" android:required="false" />

<application android:label="Street Deploy" android:allowBackup="false" android:icon="@mipmap/icon">

    <provider android:name="android.support.v4.content.FileProvider" 
          android:authorities="com.commonground.streetdeploy.fileprovider" 
          android:exported="false" android:grantUriPermissions="true">
        <meta-data android:name="android.support.FILE_PROVIDER_PATHS"
             android:resource="@xml/file_paths"></meta-data>
    </provider>
     <!--<meta-data android:name="com.google.android.geo.API_KEY" android:value="xxx" />
         <meta-data android:name="com.google.android.maps.v2.API_KEY" android:value="xxx" />
     <meta-data android:name="com.google.android.maps.v2.API_KEY" android:value="xxx" /> 
     <meta-data android:name="com.google.android.geo.API_KEY" android:value="xxx" />--> 
</application>

这是主要的活动

[活动（标签 = “街道部署”，图标 = “@mipmap/icon”，主题 = “@style/MainTheme”，MainLauncher = true，ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation）] 公共类 MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity { protected async override void OnCreate(Bundle savedInstanceState) { TabLayoutResource = Resource.Layout.Tabbar; ToolbarResource = Resource.Layout.Toolbar;

        base.OnCreate(savedInstanceState);


        /////////////////////////my code 





        await Plugin.Media.CrossMedia.Current.Initialize();




        Xamarin.FormsGoogleMaps.Init(this, savedInstanceState);

        UserDialogs.Init(this);

        Xamarin.Essentials.Platform.Init(this, savedInstanceState);



        /////////////////////////end my code 

        global::Xamarin.Forms.Forms.Init(this, savedInstanceState);

Plugin.CurrentActivity.CrossCurrentActivity.Current.Init(this, savedInstanceState);

      LoadApplication(new App());


    }
    public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
    {
        Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);

        base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
    }
}

Answer 1

确保您已在特定平台添加用户权限。

在 iOS 中 (info.plist)

<key>NSAppleMusicUsageDescription</key>
<string>App want to access your Music </string>    
<key>NSCameraUsageDescription</key>
<string>App want to access your Camera</string>
<key>NSMicrophoneUsageDescription</key>
<string>App want to access your Microphone</string>  
<key>NSPhotoLibraryUsageDescription</key>
<string>App want to access your PhotoLibrary</string>    

在 Android 中（Manifest.xml）

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.CAMERA" />

还有那行

Console.WriteLine(result);

当您同意或拒绝申请时将被调用。