我想在Android Studio中使用按钮样式“ Widget.Button.Transparent”

时间:2018-09-10 13:29:16

标签: android xml button ubuntu-16.04 android-studio-3.1.4

当我要使用此按钮样式时,将显示以下消息:

  

错误:资源android:style / Widget.Button.Transparent是私有的。

有关我的系统的详细信息:

  • 操作系统:Ubuntu 16.04 LTS
  • Android Studio 3.1.4 Build#AI-173.4907809,建于2018年7月23日
  • JRE:1.8.0_152-release-1024-b01 amd64
  • JVM:JetBrains s.r.o的OpenJDK 64位服务器VM
  • Linux 4.15.0-33-通用

1 个答案:

答案 0 :(得分:1)

只要自己动手:

styles.xmlsource)中:

<style name="Widget.Button.Transparent">
    <item name="background">@drawable/btn_default_transparent</item>
    <item name="textAppearance">?attr/textAppearanceSmall</item>
    <item name="textColor">@color/white</item>
</style>

btn_default_transparent.xml文件夹(source)中的drawable中:

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2008 The Android Open Source Project
     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at
          http://www.apache.org/licenses/LICENSE-2.0
     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
-->

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true" 
        android:drawable="@drawable/btn_default_pressed" />
    <item android:state_focused="true" android:state_enabled="true"
        android:drawable="@drawable/btn_default_selected" />
    <item android:state_enabled="true"
        android:drawable="@drawable/btn_default_transparent_normal" />
</selector>

在此引用的可绘制对象是九个补丁的PNG,并且位于DPI特定的位置。您也许可以使用@android:drawable/来访问它们,但是如果没有,这是我可以在https://github.com/aosp-mirror/platform_frameworks_base/tree/master/core/res/res/drawable-xhdpi/上找到的最高密度。