Question

我正在使用Xamarin Forms的权限插件。当我致电RequestPermissionsAsync时，通话似乎永远停滞了。下一行永远不会调用。我所做的安装与文档完全相同。那是我的代码

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

Console.WriteLine（result）//此行从不被调用

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 { 受保护的异步重写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

确保您在特定平台上具有添加用户权限。

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（Manifest.xml）中

<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" />

和线

Console.WriteLine(result);

当您同意或拒绝该申请时，将会呼叫

。

RequestPermissionsAsync永不返回

1 个答案: