Pass Objects between Activities

Question

Good morning,

I have two Activities and would like to pass an object instance between them.
The object is of type WebDavClient from a nugetpacket.

// Activity a:
Intent intent = new Intent(this, typeof(NewAcivity));
intent.PutExtra("Client", JsonConvert.SerializeObject(client));

// Activity b:
client = JsonConvert.DeserializeObject<WebDavClient>(Intent.GetStringExtra("Client"));

Am I on the wrong track in general or does it only not work with this object?
How else can objects be passed?
Via the class Intent?

Many thanks for your help.

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Answer 1

Hello,​

Welcome to our Microsoft Q&A platform!

1.Try using a custom object class as the tranfer parameter. Here the sample code, please check:

   //Activity1  
   Intent intent = new Intent(this, typeof(Activity1));  
   TestModel model = new TestModel { Name = "test_name" };  
   intent.PutExtra("model", JsonConvert.SerializeObject(model));  
   StartActivity(intent);  

   //Activity2  
   var model = JsonConvert.DeserializeObject<TestModel>(Intent.GetStringExtra("model"));  
   string text = model.Name;  

   //the model class  
   public class TestModel  
   {  
       public TestModel()  
       {  
       }  
       public string Name { get; set; }  
   }  

If the above code works well, the issue should be due to the 'WebDavClient'.

2.To share the client between activities, you could also create a global variable of the application. Create a custom Application class for the project and add a parameter in the custom class.

   [Application]  
   public class CustomApplication : Application  
   {  
       protected CustomApplication(IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer)  
       {  
       }  

       public static TestModel TheModel = new TestModel();  
   }  

   //set the `android:name` to the custom application class  
   <manifest ...>  
     <application android:name=".CustomApplication" ...>  
     </application>  
   </manifest>  


   //Activity1  
   var model = CustomApplication.TheModel;  
   model.Name = "testing...";  
   StartActivity(new Intent(this, typeof(Activity1)));  

   //Activity2  
   string text = CustomApplication.TheModel.Name;  

Best Regards,

Jarvan Zhang

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