Android ViewPagerIndicator详解及实例代码

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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