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Android ViewPagerIndicator详解及实例代码

2019-12-12 02:57:51
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Android ViewPagerIndicator详解及实例代码

关于自定义View的属性零碎知识

自定义View和自定义属性的知识不再此提及,这里着重说的是属性在自定义View中的获取方式,自定义的属性如下:

<?xml version="1.0" encoding="utf-8"?> <resources>    <declare-styleable name="Wisely">     <attr name="wisely_1" format="boolean" />     <attr name="wisely_2" format="boolean" />     <attr name="wisely_3" format="boolean" />     <attr name="wisely_4" format="boolean" />   </declare-styleable>      <attr name="wisely_out" format="boolean" />  </resources> 

自定义View的相关代码如下:

public CustomView(Context context, AttributeSet attrs) {   super(context, attrs);   TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.Wisely);   typedArray.getBoolean(R.styleable.Wisely_wisely_1, true);   typedArray.recycle(); } 

重点看R.styleable.Wisely,它返回的是一个数组,而R.styleable.Wisely_wisely_1表示的则是数组的索引,它们在R文件中的表示如下:

public static final class attr {   public static final int wisely_1 = 0x7f010000;    public static final int wisely_2 = 0x7f010001;    public static final int wisely_3 = 0x7f010002;    public static final int wisely_4 = 0x7f010003;    public static final int wisely_out = 0x7f010004;  }  public static final class styleable {   public static final int[] Wisely = { 0x7f010000, 0x7f010001,       0x7f010002, 0x7f010003 };    public static final int Wisely_wisely_1 = 0;    public static final int Wisely_wisely_2 = 1;    public static final int Wisely_wisely_3 = 2;    public static final int Wisely_wisely_4 = 3; } 

从上面可以看出一点,wisely_out也是attrs.xml中的属性,不过它是写在以Wisely命名的标签之外的,所以并未列入到styleable类的Wisely数组中。

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