- Attribute values cannot be empty.
Description: An attribute with no value can be deleted. Any declared attribute must have a value. Otherwise, the Engine will fail to be loaded and therefore display the default lock screen.
Example of incorrect settings:
In this example, visibility and h have no value, which will cause the Engine to report an error. To avoid this error, delete the two attributes or assign values to them.
- Root tags such as Lockscreen and Root must be correctly written.
Description: Spellings of root tags must be consistent with their specifications in the Themes Engine XML syntax specification. If any misspelling exists, the Engine will fail to load the tags and therefore display the default lock screen.
Example of correct settings:
- If an attribute of the boolean type is specified not to support expressions in the Themes Engine XML syntax specification, its value can only be true or false.
Description: If an attribute of the Boolean type is specified not to support expressions in the Themes Engine XML syntax specification, its value can only be true or false. Otherwise, the Engine will fail to load the attribute and therefore display the default lock screen.
Example of incorrect settings:
- If an attribute of the number type is specified not to support expressions in the Themes Engine XML syntax specification, its value can only be a number.
Description: If an attribute of the number type is specified not to support expressions in the Themes Engine XML syntax specification, its value can only be a number. Other types of values (such as character strings and expressions) will cause the Engine to fail to load the attribute and therefore display the default lock screen.
Example of incorrect settings:
time is an attribute of the number type and does not support expressions. However, it is set to an expression in this example. This will cause the Engine to fail to load the attribute and therefore display the default lock screen.
- Attribute values in VarSpeedFun must be of the specified type.
Description: Attribute values in VarSpeedFun must be of the specified type. For details about the specifications, please refer to Dynamic Engine > Themes Engine Basic Function > Mathematical Curves > VarSpeedFun. Any settings that violate the specifications will cause the Engine to fail to load the attributes and therefore display the default lock screen.
Example of correct settings:
- Special characters are not allowed.
Description: Do not use special characters (<>&'") in attribute values. Otherwise, the Engine will fail to load the attributes and therefore display the default lock screen.
Differences with Huawei Themes Live Engine (Originally Named Zooking Engine)
- If the const attribute in a variable is set to true, the value of this variable cannot be changed after initialization.
Suggestion: Do not set const in a variable or set const to false unless you need to change the value of the variable after initialization.
- If a value is specified for xsdVersion, all variables are not persistent by default; otherwise, all variables are persistent by default.
Suggestion: Use xsdVersion to declare which variables are persistent instead of using the default setting in which all variables are persistent. If you use the default setting (which is not recommended), some variables that need to change will be saved as being persistent. This may affect the performance of the Engine.
- New tags, functions, and attributes in Themes Engine need to be developed based on the Themes Engine XML syntax specification.
Suggestion: Develop new tags, functions, and attributes based on the Themes Engine XML syntax specification. Tags, attributes, and functions of Themes Engine are different from those of other engines. When transferring code of the latter to the former, please check the code according to the Dynamic Engine documents.