Android：自定义视图属性上的选择器(Android: Selector on custom View Attribute)

 我试图了解本指南： 如何添加自定义按钮状态 ，创建自己的视图属性，以及使用选择器来更改其状态。 我似乎无法让它发挥作用。 按钮选择器在非自定义选择器上工作正常，例如按下按钮，但不适用于我的costum选择器。 我的代码如下： 
 
 在attrs.xml中： 
 
<resources>
    <declare-styleable name="ValueButton">
        <attr name="toggle" format="boolean" />
    </declare-styleable>
</resources>
 
 在我的自定义按钮类定义文件中，名为ValueButton.java： 
 
public class ValueButton extends Button
{
    private static final int[] STATE_TOGLLE = {R.attr.toggle};
    private boolean toggle = false;

    public void setToggle(boolean val)
    {
        toggle = val;
    }

    public ValueButton(Context context, AttributeSet attrs) {
        super(context, attrs);
        }

    @Override
    protected int[] onCreateDrawableState(int extraSpace) {
        final int[] drawableState = super.onCreateDrawableState(extraSpace + 2);
        if(toggle)
            mergeDrawableStates(drawableState,STATE_TOGLLE);
        return drawableState;
    }
}
 
 在我看来，使用按钮： 
 
<LiniarLayout>
    <com.myapp.ValueButton
            android:id="@+id/rightText"
            custom:toggle="false"
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            style="@style/ValueSwitchStyle"
     />
</LiniarLayout>
 
 在我的styles.xml文件中： 
 
<style name="ValueSwitchStyle">
     <item name="android:background">@drawable/value_switch_background</item>
</style>
 
 最后是我的后台定义文件（button_background.xml），位于drawables文件夹中： 
 
<selector xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:custom="http://schemas.android.com/apk/com.myapp.ValueButton">
    <item custom:toggle="true" android:drawable="@color/blue"/>
    <item custom:toggle="false" android:drawable="@color/white"/>
</selector>

I have tried to folow this guide: How to add a custom button state, to create my own view attribute, and using an selector to change its state. I can't seem to get it to work. The selector for button works fine on non-custom selectors, such as button pressed, but doesn't work for my costum selector. My code is as follows:
 
in attrs.xml:
 
<resources>
    <declare-styleable name="ValueButton">
        <attr name="toggle" format="boolean" />
    </declare-styleable>
</resources>
 
In my custom button class definition file, called ValueButton.java:
 
public class ValueButton extends Button
{
    private static final int[] STATE_TOGLLE = {R.attr.toggle};
    private boolean toggle = false;

    public void setToggle(boolean val)
    {
        toggle = val;
    }

    public ValueButton(Context context, AttributeSet attrs) {
        super(context, attrs);
        }

    @Override
    protected int[] onCreateDrawableState(int extraSpace) {
        final int[] drawableState = super.onCreateDrawableState(extraSpace + 2);
        if(toggle)
            mergeDrawableStates(drawableState,STATE_TOGLLE);
        return drawableState;
    }
}
 
In my view that uses the button:
 
<LiniarLayout>
    <com.myapp.ValueButton
            android:id="@+id/rightText"
            custom:toggle="false"
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            style="@style/ValueSwitchStyle"
     />
</LiniarLayout>
 
in my styles.xml file:
 
<style name="ValueSwitchStyle">
     <item name="android:background">@drawable/value_switch_background</item>
</style>
 
and finally my background definitions file (button_background.xml), located in the drawables folder:
 
<selector xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:custom="http://schemas.android.com/apk/com.myapp.ValueButton">
    <item custom:toggle="true" android:drawable="@color/blue"/>
    <item custom:toggle="false" android:drawable="@color/white"/>
</selector>

原文：https://stackoverflow.com/questions/26690688