How to use asset folder in class

Question

Hello

in android app xamarin project

I try to use the asset.open method in class A but Asset is not recognized

class ClassA
    {
        private List<string> listsunrisetlvastro = new List<string>();
        private void readfile()
        {
            string filecontent;
            Stream thestream = Assets.Open("sunrisetlvastro.txt");
            StreamReader reader = new StreamReader(thestream);
            filecontent = reader.ReadToEnd();
         }
    }

the name Assets doesn't exit .It works only in the Main activity

Thanks

Answer 1

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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