如何在样式文件中定义可绘制对象的大小? [英] How can I define the size of the drawables in the style file?

问题描述

我只想在 res/values/styles.xml 中一次指定两个复选框的大小及其四个形状可绘制对象

I would like to specify just once in res/values/styles.xml the size of two checkboxes and their four shape drawables

1. res/drawable/cb1_checked.xml
2. res/drawable/cb1_unchecked.xml
3. res/drawable/cb2_checked.xml
4. res/drawable/cb2_unchecked.xml .

1. res/drawable/cb1_checked.xml
2. res/drawable/cb1_unchecked.xml
3. res/drawable/cb2_checked.xml
4. res/drawable/cb2_unchecked.xml.

通过这种方式，尺寸将在样式中显示一次，而不是在可绘制区域中显示四次.

This way the size would appear one time in the style rather than four in the drawables.

以下两种尝试均无效.您能提出解决方案吗? (如果您发现这两次尝试出了什么问题，请务必提及.)

Neither of the two attempts below work. Can you suggest a solution? (If you see what's wrong with these two attempts, please do mention it.)

--------------------------------------------------- ----------------- 尝试1 ------------------------ ----------------------------------------

----------------------------------------------------------------Attempt 1----------------------------------------------------------------

替换

res/drawable/cb1_checked.xml

<size android:width="24dp"
      android:height="24dp" />

使用

res/values/styles.xml

<item name="android:layout_width">24dp</item>
<item name="android:layout_height">24dp</item>

--------------------------------------------------- ----------------- 尝试2 ------------------------ ----------------------------------------

----------------------------------------------------------------Attempt 2----------------------------------------------------------------

添加

res/values/styles.xml

<item name="android:background">cb_background</item>

并定义背景可绘制对象

res/drawable/cb_background.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="#00FF00"/>
    <size android:width="24dp"
          android:height="24dp" />
</shape>

--------------------------------------------------- ----------------- 已添加 ------------------------- ---------------------------------------

----------------------------------------------------------------Added----------------------------------------------------------------

这是完整的XML文件集:

Here is the full set of XML files:

res/layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/MyLL"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content">

    <CheckBox
        android:id="@+id/cb1"
        style="@style/CB_style"
        android:button="@drawable/cb1_selector"
        android:height="@dimen/my24sp" />

    <CheckBox
        android:id="@+id/cb2"
        style="@style/CB_style"
        android:button="@drawable/cb2_selector"
        android:height="@dimen/my24sp" />

</LinearLayout>

res/values/styles.xml

<style name="AppBaseTheme" parent="android:Theme.Light">
</style>

<style name="AppTheme" parent="AppBaseTheme">
</style>

<style name="CB_style" parent="@android:style/TextAppearance.Medium">
    <item name="android:layout_width">wrap_content</item>
    <item name="android:layout_height">wrap_content</item>
    <item name="android:layout_weight">1</item>
    <item name="android:layout_gravity">center_horizontal</item>
    <item name="android:gravity">center</item>
    <item name="android:checked">false</item>
</style>

res/drawable/cb1_selector.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"
          android:constantSize="true">

    <item android:state_checked="true"
          android:drawable="@drawable/cb1_checked" />

    <item android:state_checked="false"
          android:drawable="@drawable/cb1_unchecked" />

</selector>

res/drawable/cb1_checked.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="#FF0000"/>
    <size android:width="24dp"
          android:height="24dp" />
</shape>

res/drawable/cb1_unchecked.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="#880000"/>
    <size android:width="24dp"
          android:height="24dp" />
</shape>

(以及类似的cb2选择器和选中/未选中的可绘制对象)

(and similarly for the cb2 selector and checked/unchecked drawables)

推荐答案

有一个很弱的解决方案，即 android:width 和 android:height 出现四次，但至少可以通过仅设置一个参数来调整尺寸.

There is a weak solution, weak in the sense that android:width and android:height still appear four times, but at least the dimension can be adjusted by setting just one parameter.

对于四个可绘制对象，分别添加

For each of the four drawables, add

<size android:width="@dimen/my24dp"
      android:height="@dimen/my24dp" />

并定义尺寸

res/values/dimens.xml

<dimen name="my24dp">24dp</dimen>

所以问题仍然存在:可绘制对象中是否完全不指定尺寸?

So the question remains: Can the size not be specified at all in the drawables?

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