定制知识积累

来源：互联网发布：w10网络连接图标不见了编辑：程序博客网时间：2024/06/10 02:35

若对系统自带的widget外观不满意,可以进行定制,原理是修改widget属性对应的drawable,操作步骤如下:

1.在android系统的styles.xml/theme.xml中找到控件的属性所对应的drawable(图片或selector);

2.在项目的styles.xml中自定义风格,继承系统风格,修改相应的drawable;

3.在layout.xml中设置widget的style = "@style/自定义style";

CheckBox定制

在sdk/platforms/android-**/data/res文件夹内搜索"styles.xml",并打开;

找到所需控件的style:

 <style name="Widget.CompoundButton.CheckBox">     <item name="android:button">?android:attr/listChoiceIndicatorMultiple</item> </style>

属性开头是"?",表明引用了系统的theme属性;

继续在当前目录内搜索"theme.xml",打开后找到"listChoiceIndicatorMultiple":
```
<item name="listChoiceIndicatorMultiple">@android:drawable/btn_check</item>
```

再次搜索"btn_check",可以找到"btn_check.xml":

<selector xmlns:android="http://schemas.android.com/apk/res/android">    <!-- Enabled states -->            <item android:state_checked="true" android:state_window_focused="false"          android:state_enabled="true"          android:drawable="@drawable/btn_check_on" />    <item android:state_checked="false" android:state_window_focused="false"          android:state_enabled="true"          android:drawable="@drawable/btn_check_off" />    <item android:state_checked="true" android:state_pressed="true"          android:state_enabled="true"          android:drawable="@drawable/btn_check_on_pressed" />    <item android:state_checked="false" android:state_pressed="true"          android:state_enabled="true"          android:drawable="@drawable/btn_check_off_pressed" />    <item android:state_checked="true" android:state_focused="true"          android:state_enabled="true"          android:drawable="@drawable/btn_check_on_selected" />    <item android:state_checked="false" android:state_focused="true"          android:state_enabled="true"          android:drawable="@drawable/btn_check_off_selected" />    <item android:state_checked="false"          android:state_enabled="true"          android:drawable="@drawable/btn_check_off" />    <item android:state_checked="true"          android:state_enabled="true"          android:drawable="@drawable/btn_check_on" />    <!-- Disabled states -->    <item android:state_checked="true" android:state_window_focused="false"          android:drawable="@drawable/btn_check_on_disable" />    <item android:state_checked="false" android:state_window_focused="false"          android:drawable="@drawable/btn_check_off_disable" />    <item android:state_checked="true" android:state_focused="true"          android:drawable="@drawable/btn_check_on_disable_focused" />    <item android:state_checked="false" android:state_focused="true"          android:drawable="@drawable/btn_check_off_disable_focused" />    <item android:state_checked="false" android:drawable="@drawable/btn_check_off_disable" />    <item android:state_checked="true" android:drawable="@drawable/btn_check_on_disable" /></selector>

可知系统定义了该widget选中/未选中时的图片,因此定制时,通过创建style,继承系统的checkbox风格,引用自定义selector即可;

在项目drawable目录下创建"selector_my_checkbox.xml":

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:state_checked="true" android:drawable="@drawable/my_checkbox_selected" ></item>    <item android:drawable="@drawable/my_checkbox_unselected"></item></selector>

在项目values/styles.xml中自定义style:

 <style name="MyCheckBox" parent="@android:style/Widget.CompoundButton.CheckBox">     <item name="android:button">@drawable/selector_my_checkbox</item> </style>

设置CheckBox的属性即可:

 <CheckBox     android:layout_width="wrap_content"     android:layout_height="wrap_content"     style="@style/MyCheckBox"/>

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