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今天想要在一个控件中增加自己的一条属性，具体步骤如下
1.在frameworks/base/core/res/res/values/attr中注册属性
因为我们希望增加的属性是在AutoCompleteTextView中，所以我们添加如下
<declare-styleable name="AutoCompleteTextView"> <!-- Defines the marginright in the drop down menu. --> <attr name="dropDownListItemPaddingRight" format="dimension" /> <!-- Defines the hint displayed in the drop down menu. --> <attr name="completionHint" format="string" /> <!-- Defines the hint view displayed in the drop down menu. --> <attr name="completionHintView" format="reference" /> <!-- Defines the number of characters that the user must type before completion suggestions are displayed in a drop down menu. --> <attr name="completionThreshold" format="integer" min="1" /> <!-- Selector in a drop down list. --> <attr name="dropDownSelector" format="reference|color" /> <!-- Amount of pixels by which the drop down should be offset vertically. --> <attr name="dropDownVerticalOffset" format="dimension" /> <!-- Amount of pixels by which the drop down should be offset horizontally. --> <attr name="dropDownHorizontalOffset" format="dimension" /> <!-- View to anchor the auto-complete dropdown to. If not specified, the text view itself is used. --> <attr name="dropDownAnchor" format="reference" /> </declare-styleable name="AutoCompleteTextView">
2.代码中引用
主要是在AutoCompleteTextView.java
TypedArray a = context.obtainStyledAttributes( attrs, com.android.internal.R.styleable.AutoCompleteTextView, defStyle, 0); mPopupMargnRight = (int) a.getDimension(R.styleable.AutoCompleteTextView_dropDownListItemPaddingRight, 0.0f);
3.style 中设定属性值
<style name="Widget.Funui.AutoCompleteTextView" parent="Widget.AutoCompleteTextView"> <item name="android:dropDownSelector">@android:drawable/list_selector_funui</item> <item name="android:popupBackground">@android:drawable/menu_dropdown_panel_funui</item> <item name="android:dropDownListItemPaddingRight">13dp</item> </style>
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原文地址：http://www.cnblogs.com/zhangshuli-1989/p/zhangshuli_edittext_150312134.html
