How to set the color of a different set of States for a button

　　Previously encountered a problem in the development process: How to display a button or a View object when clicked or not clickable or pressed to show a different state, and later learned that there is a resource type: <SELECTOR> Can be used to define a different color or pattern based on the state of the control.
For example, we can define a button that appears dimmed when it is disabled, green when it is turned on, and yellow when pressed. When we have the selector element we can define a number of Itme sub-elements below it to specify our properties, I can look at some of the properties of the following table:

Color Status list <item> element properties

Property	Explain
Color	Specifies a hexadecimal color for one of the following types must attribute: #RGB, #ARGB, #RRGGBB, #ARRGGBB.
State_enabled	A Boolean type that determines whether the object can receive touch or click events with the value: TRUE or FALSE.
State_checked	A Boolean type that determines whether the object is selected with a value of: TRUE or false.
State_checkable	A Boolean type that determines whether the object can be selected with a value of: TRUE or false.
state_selected	A Boolean type that determines whether the object is selected with a value of: TRUE or false.
State_focused	A Boolean type that determines whether the object gets the focus and the value: TRUE or FALSE.
State_pressed	A Boolean type that determines whether the object is pressed with a value of: TRUE or false.

　　

　　So how do you use it? Next, let's take an example:

We create a new XML file under Res/color, named Textcolor.xml, for the following:

1 <selectorxmlns:android= "Http://schemas.android.com/apk/res/android">2     3     <Item4         android:state_enabled= "true"5 Android:color= "#FF00FF"6         />7     8     <Item9         android:state_pressed= "true"Ten Android:color= "00FF00" One         /> A     <Item -         android:state_focused= "true" - Android:color= "#FF0000" the         /> -     <Item -         Android:color= "#000000" -         /> +      - </selector>

　　Then we define a Button,button in Main_activity.xml that can be written like this:

< Button          Android:layout_height = "Wrap_content"         android:layout_width= "Wrap_content"        android:text= "HelloWorld"         android:textcolor= "@color/textcolor"        />

　　This allows the button to be applied to the properties we need. In fact, it is quite simple, but when we first did not learn selector in the Java file to write a lot of useless code, this is also a small amount of code to reduce the number of tricks.

BOB

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How to set the color of a different set of States for a button