Question

我总是收到Java.Lang.SecurityException的错误：getLine1NumberForDisplay：用户10710和当前进程都没有android.permission.READ_SMS。即使我已经在AndroidManifest.xml中添加了READ_SMS

mycode的：

public string GetNumber()
{
    TelephonyManager telephonyManager = (TelephonyManager)GetSystemService(TelephonyService);
    return telephonyManager.Line1Number;
}

感谢提前和美好的一天：D

Answer 1

这是非常简单的运行时权限请求示例。

我强烈建议您阅读下面链接的Xamarin博客文章和Android文档，因为您应该向用户展示＆＃34;为什么＆＃34;您在系统对话框出现之前请求权限。

[Activity(Label = "RunTimePermissions", MainLauncher = true, Icon = "@mipmap/icon")]
public class MainActivity : Activity
{
    const int PermissionSMSRequestCode = 99;

    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        SetContentView(Resource.Layout.Main);

        Button button = FindViewById<Button>(Resource.Id.myButton);
        button.Click += delegate { 
            if ((int)Build.VERSION.SdkInt < 23) // Permissions accepted by the user during app install
                DoSomeWork();

            var permission = BaseContext.CheckSelfPermission(Manifest.Permission.ReadSms);
            if (permission == Android.Content.PM.Permission.Granted) // Did the user already grant permission?
                DoSomeWork();
            else // Ask the user to allow/deny permission request
                RequestPermissions(new string[] { Manifest.Permission.ReadSms }, PermissionSMSRequestCode);
        };
    }

    public override void OnRequestPermissionsResult(int requestCode, string[] permissions, Android.Content.PM.Permission[] grantResults)
    {
        base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == PermissionSMSRequestCode)
        {
            if ((grantResults.Count() > 0) && (grantResults[0] == Android.Content.PM.Permission.Granted))
                DoSomeWork();
            else
                Log.Debug("PERM", "The user denied access!");
        }
    }

    protected void DoSomeWork()
    {
        Log.Debug("PERM", "We have permission, so do something with it");
    }
}

参考：Requesting Runtime Permissions in Android Marshmallow

参考：Requesting Permissions at Run Time

在双Sim电话Xamarin.Form中读取Sim号码

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