Android Chinese API (33) -- Checkable

Preface

This chapter is about android. widget. Checkable, translated from "CN 7". Thanks again "CN 7 "! Welcome to join in Android API Chinese translation, contact me over140@gmail.com.

 

Statement

You are welcome to repost, but please keep the original source of the article :)

Blog Garden: http://www.cnblogs.com/

Android Chinese translation group: http://www.cnblogs.com/over140/

 

Body

I. Structure

　　　　Public interface Checkable

 

Indirect subclass

CheckBox, CheckedTextView, CompoundButton, RadioButton, ToggleButton

 

Ii. Overview

　　　　

This interface defines an extension so that the view control inherited from it has optional state attributes.

(Note: any class that inherits this interface has the android: checked attribute .)

　　　　

 

Iii. Public Methods

Public abstract boolean isChecked ()

Query the selected status of the current view control.

Return Value:

Returns a boolean value to indicate the selected status of the current view control. If the current control is selected, the return value is true. Otherwise, the return value is false.

(Note: it is not necessarily that the control displays a right sign or a point that is selected, it is very likely that a programmer with a different thinking will define a right number as unselected and return a false value. Of course, this is only possible. In general sense, the right sign and point indicate true, and vice versa .)

 

Public abstract void setChecked (boolean checked)

Sets the selected status of the current view control. Note:

Before Execution	Run	After execution
Any status	SetChecked (true)	Selected
Any status	SetChecked (false)	Not selected

Parameters:

Checked specifies that the control is selected in the "true" status, indicating that the control is set to selected, and "false" indicates that the control is not selected.

 

Public abstract void toggle ()

This method is used to switch the selected status of the current view control. (Note: Changes the current status of the View control to the opposite status .)

Before Execution	Run	After execution
Selected	Toggle ()	Not selected
Not selected	Toggle ()	Selected

 

 

End

The author of this article is very careful and even somewhat touched. Let's take a look at the original article and then look at this article. The translator has added many notes that are easier to understand, thanks again to "CN 7" for providing excellent works!