java.lang.Object | |
↳ | android.view.LayoutInflater |
Instantiates a layout XML file into its corresponding View
objects. It is never used directly. Instead, use
getLayoutInflater()
or
getSystemService(String)
to retrieve a standard LayoutInflater instance
that is already hooked up to the current context and correctly configured
for the device you are running on. For example:
LayoutInflater inflater = (LayoutInflater)context.getSystemService (Context.LAYOUT_INFLATER_SERVICE);
To create a new LayoutInflater with an additional LayoutInflater.Factory
for your
own views, you can use cloneInContext(Context)
to clone an existing
ViewFactory, and then call setFactory(LayoutInflater.Factory)
on it to include your
Factory.
For performance reasons, view inflation relies heavily on pre-processing of XML files that is done at build time. Therefore, it is not currently possible to use LayoutInflater with an XmlPullParser over a plain XML file at runtime; it only works with an XmlPullParser returned from a compiled resource (R.something file.)
Nested Classes | |||||||||||
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LayoutInflater.Factory | |||||||||||
LayoutInflater.Factory2 | |||||||||||
LayoutInflater.Filter | Hook to allow clients of the LayoutInflater to restrict the set of Views that are allowed to be inflated. |
Protected Constructors | |||||||||||
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Create a new LayoutInflater instance associated with a particular Context.
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Create a new LayoutInflater instance that is a copy of an existing
LayoutInflater, optionally with its Context changed.
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Public Methods | |||||||||||
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Create a copy of the existing LayoutInflater object, with the copy
pointing to a different Context than the original.
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Low-level function for instantiating a view by name.
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Obtains the LayoutInflater from the given context.
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Return the context we are running in, for access to resources, class
loader, etc.
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Return the current
LayoutInflater.Factory (or null).
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Return the current
LayoutInflater.Factory2 .
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Inflate a new view hierarchy from the specified xml resource.
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Inflate a new view hierarchy from the specified xml node.
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Inflate a new view hierarchy from the specified XML node.
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Inflate a new view hierarchy from the specified xml resource.
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Attach a custom Factory interface for creating views while using
this LayoutInflater.
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Like
setFactory(LayoutInflater.Factory) , but allows you to set a LayoutInflater.Factory2
interface.
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Sets the
LayoutInflater.Filter to by this LayoutInflater.
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Protected Methods | |||||||||||
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This routine is responsible for creating the correct subclass of View
given the xml element name.
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Version of
onCreateView(String, AttributeSet) that also
takes the future parent of the view being constructed.
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[Expand]
Inherited Methods | |||||||||||
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Create a new LayoutInflater instance associated with a particular Context.
Applications will almost always want to use
Context.getSystemService()
to retrieve
the standard Context.INFLATER_SERVICE
.
context | The Context in which this LayoutInflater will create its Views; most importantly, this supplies the theme from which the default values for their attributes are retrieved. |
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Create a new LayoutInflater instance that is a copy of an existing
LayoutInflater, optionally with its Context changed. For use in
implementing cloneInContext(Context)
.
original | The original LayoutInflater to copy. |
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newContext | The new Context to use. |
Create a copy of the existing LayoutInflater object, with the copy
pointing to a different Context than the original. This is used by
ContextThemeWrapper
to create a new LayoutInflater to go along
with the new Context theme.
newContext | The new Context to associate with the new LayoutInflater. May be the same as the original Context if desired. |
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Low-level function for instantiating a view by name. This attempts to instantiate a view class of the given name found in this LayoutInflater's ClassLoader.
There are two things that can happen in an error case: either the exception describing the error will be thrown, or a null will be returned. You must deal with both possibilities -- the former will happen the first time createView() is called for a class of a particular name, the latter every time there-after for that class name.
name | The full name of the class to be instantiated. |
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attrs | The XML attributes supplied for this instance. |
Obtains the LayoutInflater from the given context.
Return the context we are running in, for access to resources, class loader, etc.
Return the current LayoutInflater.Factory
(or null). This is called on each element
name. If the factory returns a View, add that to the hierarchy. If it
returns null, proceed to call onCreateView(name).
Return the current LayoutInflater.Factory2
. Returns null if no factory is set
or the set factory does not implement the LayoutInflater.Factory2
interface.
This is called on each element
name. If the factory returns a View, add that to the hierarchy. If it
returns null, proceed to call onCreateView(name).
LayoutInflater.Filter
currently used by this LayoutInflater to restrict the set of Views
that are allowed to be inflated.
Inflate a new view hierarchy from the specified xml resource. Throws
InflateException
if there is an error.
resource | ID for an XML layout resource to load (e.g.,
R.layout.main_page ) |
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root | Optional view to be the parent of the generated hierarchy. |
Inflate a new view hierarchy from the specified xml node. Throws
InflateException
if there is an error. *
Important For performance reasons, view inflation relies heavily on pre-processing of XML files that is done at build time. Therefore, it is not currently possible to use LayoutInflater with an XmlPullParser over a plain XML file at runtime.
parser | XML dom node containing the description of the view hierarchy. |
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root | Optional view to be the parent of the generated hierarchy. |
Inflate a new view hierarchy from the specified XML node. Throws
InflateException
if there is an error.
Important For performance reasons, view inflation relies heavily on pre-processing of XML files that is done at build time. Therefore, it is not currently possible to use LayoutInflater with an XmlPullParser over a plain XML file at runtime.
parser | XML dom node containing the description of the view hierarchy. |
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root | Optional view to be the parent of the generated hierarchy (if attachToRoot is true), or else simply an object that provides a set of LayoutParams values for root of the returned hierarchy (if attachToRoot is false.) |
attachToRoot | Whether the inflated hierarchy should be attached to the root parameter? If false, root is only used to create the correct subclass of LayoutParams for the root view in the XML. |
Inflate a new view hierarchy from the specified xml resource. Throws
InflateException
if there is an error.
resource | ID for an XML layout resource to load (e.g.,
R.layout.main_page ) |
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root | Optional view to be the parent of the generated hierarchy (if attachToRoot is true), or else simply an object that provides a set of LayoutParams values for root of the returned hierarchy (if attachToRoot is false.) |
attachToRoot | Whether the inflated hierarchy should be attached to the root parameter? If false, root is only used to create the correct subclass of LayoutParams for the root view in the XML. |
Attach a custom Factory interface for creating views while using
this LayoutInflater. This must not be null, and can only be set once;
after setting, you can not change the factory. This is
called on each element name as the xml is parsed. If the factory returns
a View, that is added to the hierarchy. If it returns null, the next
factory default onCreateView(View, String, AttributeSet)
method is called.
If you have an existing
LayoutInflater and want to add your own factory to it, use
cloneInContext(Context)
to clone the existing instance and then you
can use this function (once) on the returned new instance. This will
merge your own factory with whatever factory the original instance is
using.
Like setFactory(LayoutInflater.Factory)
, but allows you to set a LayoutInflater.Factory2
interface.
Sets the LayoutInflater.Filter
to by this LayoutInflater. If a view is attempted to be inflated
which is not allowed by the LayoutInflater.Filter
, the inflate(int, ViewGroup)
call will
throw an InflateException
. This filter will replace any previous filter set on this
LayoutInflater.
filter | The Filter which restricts the set of Views that are allowed to be inflated. This filter will replace any previous filter set on this LayoutInflater. |
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This routine is responsible for creating the correct subclass of View given the xml element name. Override it to handle custom view objects. If you override this in your subclass be sure to call through to super.onCreateView(name) for names you do not recognize.
name | The fully qualified class name of the View to be create. |
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attrs | An AttributeSet of attributes to apply to the View. |
ClassNotFoundException |
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Version of onCreateView(String, AttributeSet)
that also
takes the future parent of the view being constructed. The default
implementation simply calls onCreateView(String, AttributeSet)
.
parent | The future parent of the returned view. Note that this may be null. |
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name | The fully qualified class name of the View to be create. |
attrs | An AttributeSet of attributes to apply to the View. |
ClassNotFoundException |
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