fyne-io/fyne · error

TODO only know how to handle DataIntDec type here

Error message

TODO only know how to handle DataIntDec type here

What it means

In addAttributeNamespace, when a resolved attribute type spec has exactly one value, the encoder assumes that value is stored as DataIntDec (decimal integer) and then reinterprets the integer itself as a DataType tag (string/bool/etc.). If the single value has any other storage type (string, hex, float), there is no code path for it and the function panics with this TODO.

Solutions

1. Remove the recently added attribute from the custom manifest (bisect to identify it)
2. Update fyne to a version whose vendored tables encode the attribute as DataIntDec
3. Patch addAttributeNamespace to handle the additional data type and contribute the fix upstream

// Pre-flight: diff your custom manifest attributes against a known-good baseline
// (attributes encoded successfully by your current fyne version).
func checkAttrs(custom, baseline []string) error {
    known := map[string]bool{}
    for _, a := range baseline { known[a] = true }
    for _, a := range custom {
        if !known[a] { return fmt.Errorf("unvetted manifest attribute %q may not be encodable", a) }
    }
    return nil
}

When it happens

Trigger: A manifest attribute whose framework type spec contains exactly one value typed as something other than DataIntDec - an attribute whose format definition is stored as a string in the vendored tables - during 'fyne package -os android'.

Common situations: Same class as the empty-values panic: newer or unusual android: attributes; vendored framework data lagging the SDK; fyne versions behind current Android releases.

Related errors

• encountered empty values slice
• unhandled token type: %T %+v
• string lengths over 1<<15 not yet supported, got len
• unsupported architecture:
• unsupported GOARCH:

AI-assisted analysis of fyne-io/fyne@8860ee95c3 (2026-08-15). Data as JSON: /api/errors/fee14ddca640ae4a. Report an issue: GitHub.

Appendix: source

Thrown at cmd/fyne/internal/mobile/binres/binres.go:668

// If the value was not already present in pool, it is added.
func addAttributeNamespace(attr xml.Attr, nattr *Attribute, tbl *Table, pool *Pool) error {
	// get type spec and value data type
	ref, err := tbl.RefByName("attr/" + attr.Name.Local)
	if err != nil {
		return err
	}
	nt, err := ref.Resolve(tbl)
	if err != nil {
		return err
	}
	if len(nt.values) == 0 {
		panic("encountered empty values slice")
	}

	if len(nt.values) == 1 {
		val := nt.values[0]
		if val.data.Type != DataIntDec {
			panic("TODO only know how to handle DataIntDec type here")
		}

		t := DataType(val.data.Value)
		switch t {
		case DataString, DataAttribute, DataType(0x3e):
			// TODO identify 0x3e, in bootstrap.xml this is the native lib name
			nattr.RawValue = pool.ref(attr.Value)
			nattr.TypedValue.Type = DataString
			nattr.TypedValue.Value = uint32(nattr.RawValue)
		case DataIntBool, DataType(0x08):
			nattr.TypedValue.Type = DataIntBool
			switch attr.Value {
			case "true":
				nattr.TypedValue.Value = 0xFFFFFFFF
			case "false":
				nattr.TypedValue.Value = 0
			default:
				return fmt.Errorf("invalid bool value %q", attr.Value)

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