Android designer diagnostic analyzers

This guide lists all of the currently supported Android layout diagnostic analyzers.

Accessibility

The following analyzers help to improve accessibility support:

ID	Title	Severity	Description
ContentDescription	Image without contentDescription	Warning	Missing contentDescription attribute on image

Correctness

The following analyzers help fix correctness issues in a layout:

ID	Title	Severity	Description	Help
AdapterViewChildren	AdapterView with children	Warning	AdapterViews cannot have children in XML	Link
MissingId	Fragments should specify an id or tag	Warning	This <fragment> tag should specify an id or a tag to preserve state across activity restarts	Link
NestedScrollingVertical	Nested vertically scrolling elements	Warning	Nested scrolling widgets
NestedScrollingHorizontal	Nested horizontally scrolling elements	Warning	Nested scrolling widgets
ScrollViewSize	ScrollView children with wrong fill_parent/match_parent sizes	Warning	ScrollView children with wrong fill_parent/match_parent sizes
ScrollViewCount	ScrollViews can have only one child	Warning	A scroll view can have only one child
MissingAndroidNamespace	Missing Android namespace on attribute	Error	Missing Android XML namespace; your attribute will be interpreted as a custom attribute
DuplicateIDs	Duplicate IDs	Error	Duplicate ids within a single layout
IncludeLayoutParamsMissingWidthAndHeight	Missing both width and height	Error	Ignored layout params on include	Link
IncludeLayoutParamsMissingWidth	Missing width	Error	Ignored layout params on include	Link
IncludeLayoutParamsMissingHeight	Missing height	Error	Ignored layout params on include	Link
Orientation	Missing explicit orientation	Error	Missing explicit orientation
Suspicious0dp	Suspicious 0dp dimension	Error	Suspicious 0dp dimension
RequiredSizeWidth	Missing width attribute	Error	Missing attribute: layout_width
RequiredSizeHeight	Missing height attribute	Error	Missing attribute: layout_height
WebViewLayout	WebViews in wrap_content parents	Error
WrongCase	Wrong case for view tag	Error	Wrong case for view tag	Link

Design

The following analyzers help to improve how you join layout files:

ID	Title	Severity	Description
HardcodedColor	Hardcoded color	Info	Hardcoded color often leads to inconsistency
HardcodedSize	Hardcoded size	Info	Hardcoded size often leads to inconsistency
HardcodedText	Hardcoded text	Warning	Hardcoded text
UnresolvedResource	Unresolved resource URL	Warning	This resource URL cannot be resolved
XmlErrors	XML syntax error	Error	XML syntax error

Performance

The following analyzers help improve the performance of your layout:

ID	Title	Severity	Description
NestedWeights	Nested layout weights	Warning	Nested weights are bad for performance
TooManyViews	Layout has too many views	Warning	Layout has too many views
TooDeepLayout	Layout hierarchy is too deep	Warning	Layout hierarchy is too deep
UselessParent	Useless parent layout	Warning	Useless parent layout
UselessLeaf	Useless leaf layout	Warning	This %1$s view is useless (no children, no background, no id, no style)

Usability

The following analyzers help improve layout usability for your customers:

ID	Title	Severity	Description
NegativeMargin	Negative Margins	Warning	Negative Margins
MissingInputType	EditText with no inputType	Warning	No input type specified
InputTypePhone	EditText appears to be a phone number	Warning	The view name suggests this is a phone number, but it does not include phone in the inputType
InputTypeNumber	EditText appears to be a number	Warning	The view name suggests this is a number, but it does not include a numeric inputType (such as numberDecimal)
InputTypePassword	EditText appears to be a password	Warning	The view name suggests this is a password, but it does not include password in the inputType (such as textVisiblePassword)
InputTypePIN	EditText appears to be a PIN	Warning	The view name suggests this is a password (PIN), but it does not include numberPassword in the inputType
InputTypeEmail	EditText appears to be an email	Warning	The view name suggests this is an e-mail address, but it does not include email in the inputType (such as textEmailAddress)
InputTypeURI	EditText appears to be a URI	Warning	The view name suggests this is a URI, but it does not include textUri in the inputType
InputTypeDate	EditText appears to be a date	Warning	The view name suggests this is a date, but it does not include date in the inputType (such as datetime)