问题描述
我正在开发一个支持Jelly Beans的Android应用程序。我将自己的样式定义为:
I am developing an Android application with support for Jelly Beans onwards. I have my own style defined as:
<style name="AppTheme" parent="Theme.AppCompat.NoActionBar">
</style>
<style name="AppTheme.Child" parent="AppTheme">
<item name="colorButtonNormal">@color/login_button_enabled</item>
</style>
<style name="HomeButton" parent="Widget.AppCompat.Button">
<item name="android:background">@drawable/home_button</item>
</style>
并且drawable / home_button.xml定义为:
And drawable/home_button.xml is defined as:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<inset xmlns:android="http://schemas.android.com/apk/res/android"
android:insetLeft="@dimen/button_inset_horizontal_material"
android:insetTop="@dimen/button_inset_vertical_material"
android:insetRight="@dimen/button_inset_horizontal_material"
android:insetBottom="@dimen/button_inset_vertical_material">
<shape android:shape="rectangle">
<corners android:radius="@dimen/control_corner_material" />
<solid android:color="?attr/colorButtonNormal" />
<padding android:left="@dimen/button_padding_horizontal_material"
android:top="@dimen/button_padding_vertical_material"
android:right="@dimen/button_padding_horizontal_material"
android:bottom="@dimen/button_padding_vertical_material" />
</shape>
</inset>
</item>
</selector>
这种风格在Lollipop +中完美无缺,但对于pre-lollipop Android,如果我添加style =@ style / home_button它只是崩溃了。 logcat显示错误:
This style works flawlessly in Lollipop+, however for pre-lollipop Android, if I add style="@style/home_button" it just crashes. The logcat shows errors as:
java.lang.RuntimeException: Unable to start activity ComponentInfo{my.domain.app/my.domain.app.MyActivity}: android.view.InflateException: Binary XML file line #46: Error inflating class Button
...
Caused by: android.view.InflateException: Binary XML file line #46: Error inflating class Button
...
Caused by: android.content.res.Resources$NotFoundException: File res/drawable/home_button.xml from drawable resource ID #0x...
...
Caused by: java.lang.UnsupportedOperationException: Can't convert to color: type=0x2
如果我删除行< solid android:color =?attr / colorButtonNormal/>
该应用程序不会崩溃但颜色不会呈现。 我想我的风格有问题,但我无法意识到。我的build.gradle中的构建配置和库是:
If I remove the line <solid android:color="?attr/colorButtonNormal" />
the app does not crash but the color is not rendered. I suppose that I have something wrong with my style but I cannot realise what. My build configuration and libraries in my build.gradle are:
apply plugin: 'com.android.application'
android {
compileSdkVersion 22
buildToolsVersion "22.0.1"
defaultConfig {
applicationId "xx.xxxx.xxx"
minSdkVersion 14
targetSdkVersion 22
versionCode 1
versionName "1.0"
}
buildTypes {
debug {
testCoverageEnabled true
}
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
compile 'com.android.support:appcompat-v7:22.2.1'
compile 'com.android.support:design:22.2.1'
compile 'com.android.support:cardview-v7:22.2.1'
compile project(':xxxxx')
}
感谢您的帮助!
推荐答案
你没有做错 - drawables的主题属性(在你的情况下?attr / colorButtonNormal
)在Lollipop之前的设备上不受支持。 (请参阅作为参考)
You've done nothing wrong - theme attributes for drawables (in your case ?attr/colorButtonNormal
) simply aren't supported on pre-Lollipop devices. (See this Issue as a reference)
因此,要么直接引用颜色,要么为要支持的每种颜色创建 home_button.xml ,并将它们添加到您在活动代码中设置的不同主题稍后。
So either reference the color directly or create a home_button.xml for every possible color you want to support and add them to different themes which you set in your activity code later on.
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