JNI DETECTED ERROR IN APPLICATION around accessing boolean fields

[jonpryor]

Android framework version

net10.0-android (Preview)

Affected platform version

.NET 10 Preview 6

Description

Bound boolean fields can no longer be used.

Steps to Reproduce

Add the following code to Activity.OnCreate():

var p = new RelativeLayout.LayoutParams(1, 2)
{
    AlignWithParent = true,
};

RelativeLayout.LayoutParams.AlignWithParent binds the Java field RelativeLayout.LayoutParams.alignWithParent

Run the app under .NET 10, e.g. Debug build dotnet build -t:Install,StartAndroidActivity.

App crashes; adb logcat contains:

F droid_boolfiel: java_vm_ext.cc:542] JNI DETECTED ERROR IN APPLICATION: attempt to access field boolean android.widget.RelativeLayout$LayoutParams.alignWithParent of type boolean with the wrong type byte: 0x709385d8
F droid_boolfiel: java_vm_ext.cc:542]     in call to SetByteField
F droid_boolfiel: java_vm_ext.cc:542]     from void crc6463d68d2626be2acb.MainActivity.n_onCreate(android.os.Bundle)

The cause of the crash is in the binding for AlignWithParent:

	public partial class RelativeLayout : Android.Views.ViewGroup {
		public new partial class LayoutParams : Android.Views.ViewGroup.MarginLayoutParams {

			[Register ("alignWithParent")]
			public bool AlignWithParent {
				get {
					const string __id = "alignWithParent.Z";

					var __v = _members.InstanceFields.GetBooleanValue (__id, this);
					return __v;
				}
				set {
					const string __id = "alignWithParent.Z";

					try {
						_members.InstanceFields.SetValue (__id, this, value ? (sbyte)1 : (sbyte)0);
					} finally {
					}
				}
			}
		}
	}

Specifically, the _members.InstanceFields.SetValue() call provides (sbyte)1 : (sbyte)0 and not true : false.

Did you find any workaround?

No.

Relevant log output

[jonpryor]

I suspect that this breakage was introduced in dotnet/java-interop@57f7bc8

[jonpryor]

new RelativeLayout.LayoutParams fragment does not crash on .NET 10 Preview 1. It does crash on .NET 10 Preview 2 and later.