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@Target(value=ANNOTATION_TYPE) public @interface InverseBindingMethod
InverseBindingMethod is used to identify how to listen for changes to a View property and which
getter method to call. InverseBindingMethod should be associated with any class as part of
InverseBindingMethods
.
@InverseBindingMethods({@InverseBindingMethod( type = android.widget.TextView.class, attribute = "android:text", event = "android:textAttrChanged", method = "getText")}) public class MyTextViewBindingAdapters { ... }
method
is optional. If it isn't provided, the attribute name is used to
find the method name, either prefixing with "is" or "get". For the attribute
android:text
, data binding will search for a
public CharSequence getText()
method on android.widget.TextView
.
event
is optional. If it isn't provided, the event name is assigned the
attribute name suffixed with AttrChanged
. For the android:text
attribute, the default event name would be android:textAttrChanged
. The event
should be set using a BindingAdapter
. For example:
@BindingAdapter(value = {"android:beforeTextChanged", "android:onTextChanged", "android:afterTextChanged", "android:textAttrChanged"}, requireAll = false) public static void setTextWatcher(TextView view, final BeforeTextChanged before, final OnTextChanged on, final AfterTextChanged after, final InverseBindingListener textAttrChanged) { TextWatcher newValue = new TextWatcher() { ... @Override public void onTextChanged(CharSequence s, int start, int before, int count) { if (on != null) { on.onTextChanged(s, start, before, count); } if (textAttrChanged != null) { textAttrChanged.onChange(); } } } TextWatcher oldValue = ListenerUtil.trackListener(view, newValue, R.id.textWatcher); if (oldValue != null) { view.removeTextChangedListener(oldValue); } view.addTextChangedListener(newValue); }
InverseBindingAdapter
,
InverseBindingListener
Required Element Summary | |
---|---|
java.lang.String |
attribute
The attribute that supports two-way binding. |
java.lang.Class |
type
The View type that is associated with the attribute. |
Optional Element Summary | |
---|---|
java.lang.String |
event
The event used to notify the data binding system that the attribute value has changed. |
java.lang.String |
method
The getter method to retrieve the attribute value from the View. |
Element Detail |
---|
public abstract java.lang.Class type
public abstract java.lang.String attribute
public abstract java.lang.String event
public abstract java.lang.String method
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