PullToRefresh Demo 浅析：自定义刷新(refreshview)样式

PullToRefresh除了可以自己定制刷新的内容之外，最重要的还是在与当用户下拉和上拉时候的样式问题。

打开library源码，发现refreshview的样式定义在了LoadingLayout类中。

public abstract class LoadingLayout extends FrameLayout implements ILoadingLayout {

构造函数中：

switch (scrollDirection) {
            case HORIZONTAL:
                LayoutInflater.from(context).inflate(R.layout.pull_to_refresh_header_horizontal, this);
                break;
            case VERTICAL:
            default:
                LayoutInflater.from(context).inflate(R.layout.pull_to_refresh_header_vertical, this);
                break;
        }

可以看出根据不同的方向选用不同的布局，所以对于自定义refreshview来说，就是重新选择布局。

参考：http://www.2cto.com/kf/201501/368016.html

---

附带：PullToRefresh的自定义样式属性：

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <declare-styleable name="PullToRefresh">
    <!-- A drawable to use as the background of the Refreshable View -->
    <!-- 设置整个刷新列表的背景色 -->
    <attr name="ptrRefreshableViewBackground" format="reference|color" />
    <!-- A drawable to use as the background of the Header and Footer Loading Views -->
    <!--  设置下拉Header或者上拉Footer的背景色 -->
    <attr name="ptrHeaderBackground" format="reference|color" />
    <!-- Text Color of the Header and Footer Loading Views -->
    <!-- 用于设置Header与Footer中文本的颜色 -->
    <attr name="ptrHeaderTextColor" format="reference|color" />
    <!-- Text Color of the Header and Footer Loading Views Sub Header -->
    <!-- 用于设置Header与Footer中上次刷新时间的颜色 -->
    <attr name="ptrHeaderSubTextColor" format="reference|color" />
    <!-- Mode of Pull-to-Refresh that should be used -->
    <attr name="ptrMode">
      <flag name="disabled" value="0x0" /><!-- 禁用下拉刷新 -->
      <flag name="pullFromStart" value="0x1" /><!-- 仅支持下拉刷新 -->
      <flag name="pullFromEnd" value="0x2" /><!-- 仅支持上拉刷新 -->
      <flag name="both" value="0x3" /><!-- 上拉刷新和下拉刷新都支持 -->
      <flag name="manualOnly" value="0x4" /><!-- 只允许手动触发 -->

      <!-- These last two are depreacted -->
      <flag name="pullDownFromTop" value="0x1" />
      <flag name="pullUpFromBottom" value="0x2" />
    </attr>
    <!-- Whether the Indicator overlay(s) should be used -->
    <!-- 如果为true会在mPullRefreshListView中出现icon，右上角和右下角，挺有意思的 -->
    <attr name="ptrShowIndicator" format="reference|boolean" />
    <!-- Drawable to use as Loading Indicator. Changes both Header and Footer. -->
    <!-- 同时改变头部和底部的图标 -->
    <attr name="ptrDrawable" format="reference" />
    <!-- Drawable to use as Loading Indicator in the Header View. Overrides value set in ptrDrawable. -->
    <!-- 头部视图的图标-->
    <attr name="ptrDrawableStart" format="reference" />

    <!-- Drawable to use as Loading Indicator in the Footer View. Overrides value set in ptrDrawable. -->
    <!-- 底部视图的图标 -->
    <attr name="ptrDrawableEnd" format="reference" />
    <!-- Whether Android's built-in Over Scroll should be utilised for Pull-to-Refresh. -->
    <attr name="ptrOverScroll" format="reference|boolean" />
    <!-- Base text color, typeface, size, and style for Header and Footer Loading Views -->
     <!-- 分别设置拉Header或者上拉Footer中字体的类型颜色等等 -->
    <attr name="ptrHeaderTextAppearance" format="reference" />
    <!-- Base text color, typeface, size, and style for Header and Footer Loading Views Sub Header -->
    <attr name="ptrSubHeaderTextAppearance" format="reference" />
    <!-- Style of Animation should be used displayed when pulling. -->
    <attr name="ptrAnimationStyle">
      <flag name="rotate" value="0x0" /><!-- flip（翻转动画）， rotate（旋转动画）  -->
      <flag name="flip" value="0x1" />
    </attr>
    <!-- Whether the user can scroll while the View is Refreshing -->
    <!-- 刷新的时候，是否允许ListView或GridView滚动 -->
    <attr name="ptrScrollingWhileRefreshingEnabled" format="reference|boolean" />
    <!--
      Whether PullToRefreshListView has it's extras enabled. This allows the user to be 
      able to scroll while refreshing, and behaves better. It acheives this by adding
      Header and/or Footer Views to the ListView.
    -->
    <!-- 决定了Header，Footer以何种方式加入mPullRefreshListView，true为headView方式加入，就是滚动时刷新头部会一起滚动 -->
    <attr name="ptrListViewExtrasEnabled" format="reference|boolean" />
    <!--
      Whether the Drawable should be continually rotated as you pull. This only
      takes effect when using the 'Rotate' Animation Style.
    -->
    <attr name="ptrRotateDrawableWhilePulling" format="reference|boolean" />
    <!-- BELOW HERE ARE DEPRECEATED. DO NOT USE. -->
    <attr name="ptrAdapterViewBackground" format="reference|color" />
    <attr name="ptrDrawableTop" format="reference" />
    <attr name="ptrDrawableBottom" format="reference" />
  </declare-styleable>
</resources>

通过在layout文件中定义不同的属性，基本能够满足我们自己做项目的需求。