MuntashirAkon/AppManager · error · XmlPullParserException

Invalid conversion from " + type

Error message

Invalid conversion from " + type

What it means

Attribute.getValueDouble() throws XmlPullParserException from its default switch branch when the attribute's stored type is not convertible to double (e.g. TYPE_BOOLEAN_TRUE, TYPE_NULL, byte-array types). Only TYPE_DOUBLE, numeric types and TYPE_STRING/TYPE_STRING_INTERNED are accepted.

Source

Thrown at libcore/compat/src/main/java/io/github/muntashirakon/compat/xml/BinaryXmlPullParser.java:864

                    }
                default:
                    throw new XmlPullParserException("Invalid conversion from " + type);
            }
        }

        public double getValueDouble() throws XmlPullParserException {
            switch (type) {
                case TYPE_DOUBLE:
                    return valueDouble;
                case TYPE_STRING:
                case TYPE_STRING_INTERNED:
                    try {
                        return Double.parseDouble(valueString);
                    } catch (Exception e) {
                        throw new XmlPullParserException("Invalid attribute " + name + ": " + e);
                    }
                default:
                    throw new XmlPullParserException("Invalid conversion from " + type);
            }
        }

        public boolean getValueBoolean() throws XmlPullParserException {
            switch (type) {
                case TYPE_BOOLEAN_TRUE:
                    return true;
                case TYPE_BOOLEAN_FALSE:
                    return false;
                case TYPE_STRING:
                case TYPE_STRING_INTERNED:
                    if ("true".equalsIgnoreCase(valueString)) {
                        return true;
                    } else if ("false".equalsIgnoreCase(valueString)) {
                        return false;
                    } else {
                        throw new XmlPullParserException(
                                "Invalid attribute " + name + ": " + valueString);

View on GitHub (pinned to 0152f468fc)

Solutions

  1. Use the getter matching the attribute's actual type as recorded by the writer.
  2. Inspect Attribute.getType() first and dispatch to the correct getValueXxx method.
  3. Align the serializer so the attribute is written as TYPE_DOUBLE when a double is expected.
  4. Catch XmlPullParserException and skip/default the attribute.

Example fix

// before
double d = attr.getValueDouble(); // boolean-typed attr throws
// after
double d = (attr.getType() == XmlPullParser.TYPE_BOOLEAN_TRUE)
        ? (attr.getValueBoolean() ? 1.0 : 0.0)
        : attr.getValueDouble();
Defensive patterns

Strategy: type-guard

Validate before calling

int t = attr.getType();
boolean ok = t == XmlPullParser.TYPE_DOUBLE || t == XmlPullParser.TYPE_INT
        || t == XmlPullParser.TYPE_LONG || t == XmlPullParser.TYPE_STRING
        || t == XmlPullParser.TYPE_STRING_INTERNED;

Type guard

boolean isDoubleReadable(TypedXmlPullParser.Attribute a) {
    switch (a.getType()) {
        case XmlPullParser.TYPE_DOUBLE:
        case XmlPullParser.TYPE_INT:
        case XmlPullParser.TYPE_LONG:
        case XmlPullParser.TYPE_STRING:
        case XmlPullParser.TYPE_STRING_INTERNED:
            return true;
        default:
            return false;
    }
}

Try / catch

try {
    d = attr.getValueDouble();
} catch (XmlPullParserException e) {
    d = 0.0; // or rethrow with context
}

Prevention

When it happens

Trigger: Calling getValueDouble() on an attribute whose recorded type is TYPE_BOOLEAN_TRUE, TYPE_NULL, TYPE_BYTES_BASE64 or TYPE_BYTES_HEX.

Common situations: Mismatch between writer and reader schema (value type changed between app versions), or accidentally reading a boolean/bytes attribute as a double when parsing Android binary XML.

Understand the failure class

Background: "is not a compatible type" / "cannot merge" errors: when a value's type doesn't match what the library requires — this error's family across 65 libraries.

Related errors

AI-assisted analysis of MuntashirAkon/AppManager@0152f468fc (2026-09-12). Data as JSON: /api/errors/283e9ff35b2c312e. Report an issue: GitHub.