How to wire up Android Share Intent in MAUI?

Question

Hi,

I'm trying to respond to Android Share Intents. I'm wondering what I'm doing wrong. I've started a new MAUI app in Visual Studio (latest version of MAUI, latest preview of VS as of August 15 2022).

In the AndroidManifest.xml file, I have defined the activity:

<activity   
			android:exported="true"  
			android:name="myamazijng.shareactivity" >  
			<intent-filter>  
				<action android:name="android.intent.action.SEND" />  
				<category android:name="android.intent.category.DEFAULT" />  
				<data android:mimeType="text/plain" />  
			</intent-filter>  
		</activity>  

Then my activity is defined as follows:

[Activity(Name = "myamazing.shareactivity", Exported = true)]  
public class ShareActivity : MauiAppCompatActivity  
{  
  
	protected override void OnCreate(Bundle? savedInstanceState)  
	{  
		base.OnCreate(savedInstanceState); //throws Exception  
  
		if (Intent.Type == "text/plain")  
		{  
			  
		}  
	}  
  

A share intent is succesfully registered on the Android emulator. But clicking on it throws a NullReferenceEception in the call to base.OnCreate..

Digging into the Exception, it's thrown here in Microsoft.Maui.Controls at Microsoft.Maui.Controls.Platform.Compatibility.ShellToolbarTracker.OnToolbarPropertyChanged(Object sender, PropertyChangedEventArgs e) . ShellToolbarTracker.cs:line 58

Am I doing this incorrectly, or have I run into a bug? Is there a workaround?

Answer 1

Hello,

I've tested your sample, and found a workaround. You could try the following steps:

Step1. Create a new Activity class file, such as ShareActivity.cs in the Platforms/Android/ folder.

Step2. Copy your ShareActivity class into this ShareActivity.cs, then, please add the following code for your Activity:

   [Activity(Theme = "@style/Maui.SplashTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize | ConfigChanges.Density, ScreenOrientation = ScreenOrientation.Portrait)]  
   [IntentFilter(new[] { Intent.ActionSend }, Categories = new[] { Intent.CategoryDefault }, DataMimeType = "text/plain")]  
   public class ShareActivity : MauiAppCompatActivity  

Note: The Intent object is in the Android.Content namespace.

After that, you could see the AlertDialog to input your url link.

Best Regards,

Alec Liu.

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Answer 2

the name in your definition in the android manifest file is different to the one in your action. android:name="myamazijng.shareactivity"