我怎样才能在XML为Android创建我的自定义属性？ [英] How can I create my custom properties on xml for Android?

问题描述

我们有我们的项目与钥匙的元素，这主要内容有属性如Android键盘：codeS =119，机器人：keyLabel =W等

我的问题是我怎么能包括自定义属性就好了。机器人：alternativeKeyLabel做别的事情

解决方案

这个链接给出了一个肤浅的解释： <一href="http://developer.android.com/guide/topics/ui/custom-components.html">http://developer.android.com/guide/topics/ui/custom-components.html

考虑你有一个CustomKeyboard继承自KeyboardView /查看：

在水库/价值/ attrs.xml文件（创建文件，如果它不存在）
1. 创建自定义属性：

 ＆LT; XML版本=1.0编码=UTF-8＆GT？;
＆LT;资源＆GT;
   ＆LT;申报，设置样式名称=custom_keyboard＆GT;
        ＆LT; attr指示NAME =alternative_key_label格式=字符串/＆GT;
    ＆LT; /申报，设置样式＆GT;

＆LT; /资源＆GT;
 

1. 在创建自定义组件构造覆盖接收设置属性默认构造函数，因为当布局加载此人会被调用。

    公共CustomKeyboard（上下文的背景下，AttributeSet中集）{
       超（背景下，设置）;
       TypedArray A = context.obtainStyledAttributes（套，R.styleable.custom_keyboard）;
       CharSequence中= a.getString（R.styleable.custom_keyboard_alternative_key_label）;
       如果（S！= NULL）{
           this.setAlternativeKeyLabel（s.toString（））;
       }
       a.recycle（）;
   }
    

2. 在你的布局文件，你的自定义组件和链接添加到您的资源。

 ＆LT;布局的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    的xmlns：程序=htt​​p://schemas.android.com/apk/res/your.package.ProjectName
    ... /＆GT;
    ...
    ＆LT; your.package.projectname.CustomKeyboard
        机器人：ID =@ + ID / my_keyboard
        ...
        应用程序：alternative_key_label =F＆GT;
    ＆LT; /your.package.projectname.CustomKeyboard>
＆LT; /布局和GT;
 

We have in our project a keyboard with "Key" elements, this Key elements have attributes such as android:codes="119", android:keyLabel="w" and so on.

My question is how can I include an custom attribute like a "android:alternativeKeyLabel" to do something else.

解决方案

This link gives a superficial explanation: http://developer.android.com/guide/topics/ui/custom-components.html

Considering you have a CustomKeyboard that inherits from KeyboardView/View:

1. Create your custom properties in res/values/attrs.xml file (create the file if it does not exist):

<?xml version="1.0" encoding="utf-8"?>
<resources>
   <declare-styleable name="custom_keyboard">
        <attr name="alternative_key_label" format="string" />
    </declare-styleable>

</resources>

1. Create a constructor in your custom component overriding default constructor that receives the attribute set because this one will be called when the layout is loaded.

   public CustomKeyboard(Context context, AttributeSet set) {
       super(context, set);
       TypedArray a = context.obtainStyledAttributes(set,R.styleable.custom_keyboard);
       CharSequence s = a.getString(R.styleable.custom_keyboard_alternative_key_label);
       if (s != null) {
           this.setAlternativeKeyLabel(s.toString());
       }
       a.recycle();
   }
   

2. In your layout file, add your custom component and the link to your resources.

 <Layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res/your.package.ProjectName"
    .../>
    ...
    <your.package.projectname.CustomKeyboard
        android:id="@+id/my_keyboard"
        ...
        app:alternative_key_label="F">
    </your.package.projectname.CustomKeyboard>
</Layout>

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