Hello,
You can create a static property and set it in the MainActivity.cs
public class MainActivity : AppCompatActivity
{
//Create this static property
public static MainActivity Instance { get; private set; }
protected override void OnCreate(Bundle savedInstanceState)
{
//Set this property
Instance = this;
base.OnCreate(savedInstanceState);
Xamarin.Essentials.Platform.Init(this, savedInstanceState);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.activity_main);
}
After that, you can use it in the ClassA.cs
class ClassA
{
private List<string> listsunrisetlvastro = new List<string>();
private void readfile()
{
string filecontent;
//use this Instance value at here.
Stream thestream = MainActivity.Instance.Assets.Open("sunrisetlvastro.txt");
StreamReader reader = new StreamReader(thestream);
filecontent = reader.ReadToEnd();
}
}
As note: please make sure the buildAction of sunrisetlvastro.txt
is AndroidAsset.
In addition, Xamarin support ended on May 1, 2024 for all Xamarin SDKs including Xamarin.Forms. For more information, please check: Xamarin official support policy | .NET (microsoft.com). We will recommend you upgrade Xamarin.Android projects to . NET , please see the Upgrade from Xamarin to .NET & .NET MAUI documentation.
Best Regards,
Leon Lu
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