PullToRefresh修改上拉下拉加载动画

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修改PullTuRefreshListView源码：
实现动画加载：

第一步：

源码分析：

PullToRefrehListView 默认加载动画是很难看的：
这里写图片描述

默认是很难看的但我们想要实现我们的效果怎么办？

分析源码：

找到PullRefreshListView 分析：

我们知道上拉和下拉加载动画无非是 pullToRefreshListView 中添加了头和脚，而头和脚都是动画！！

PullToRefreshListView.java 两个动画类变量：

//定义  头部和尾部的加载动画private LoadingLayout mHeaderLoadingView;private LoadingLayout mFooterLoadingView;...//加载布局@Overrideprotected LoadingLayoutProxy createLoadingLayoutProxy(final boolean includeStart, final boolean includeEnd) {LoadingLayoutProxy proxy = super.createLoadingLayoutProxy(includeStart, includeEnd);if (mListViewExtrasEnabled) {final Mode mode = getMode();if (includeStart && mode.showHeaderLoadingLayout()) {//添加  头部动画 到listView中proxy.addLayout(mHeaderLoadingView);}if (includeEnd && mode.showFooterLoadingLayout()) {//添加  添加脚部动画  到listView中proxy.addLayout(mFooterLoadingView);}}return proxy;}
...

createLoadingLayoutProxy方法继承自抽象类PullToRefreshAdapterViewBase查看方法没有该方法继续父类查找，查找PullToRefreshAdapterViewBase父类PullToRefreshBase：


// We need to create now layouts nowmHeaderLayout = createLoadingLayout(context, Mode.PULL_FROM_START, a);mFooterLayout = createLoadingLayout(context, Mode.PULL_FROM_END, a);...//加载动画    布局----------protected LoadingLayout createLoadingLayout(Context context, Mode mode, TypedArray attrs) {LoadingLayout layout = mLoadingAnimationStyle.createLoadingLayout(context, mode,getPullToRefreshScrollDirection(), attrs);layout.setVisibility(View.INVISIBLE);return layout;}...//此处实现了我们需要  修改的动画方法：
//修改代码实现  自己的下载刷新动画LoadingLayout createLoadingLayout(Context context, Mode mode, Orientation scrollDirection, TypedArray attrs) {switch (this) {case ROTATE://旋转动画default://帧动画   frameAnimationLayout为     自定义动画类return new FrameAnimationLayout(context, mode, scrollDirection, attrs);//旋转动画   默认的动画
//                  return new RotateLoadingLayout(context, mode, scrollDirection, attrs);case FLIP:return new FlipLoadingLayout(context, mode, scrollDirection, attrs);}}

//自定义动画类实现动画

package com.handmark.pulltorefresh.library.internal;import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.AnimationDrawable;
import android.graphics.drawable.Drawable;import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.R;/*** Package_name:com.handmark.pulltorefresh.library.internal* Author:zhaoQiang* Email:zhao_hero@163.com* Date:2016/11/28  19:34** 帧动画  实现加载自定义的动画   实现的是帧动画*/
public class FrameAnimationLayout extends LoadingLayout{
//继承自 PullToRefreshListView提供的loadingLayout类private AnimationDrawable mAnimationDrawable;public FrameAnimationLayout(Context context, PullToRefreshBase.Mode mode,PullToRefreshBase.Orientation scrollDirection, TypedArray attrs) {super(context, mode, scrollDirection, attrs);mHeaderImage.setImageResource(R.drawable.ptr_animation);mAnimationDrawable = (AnimationDrawable) mHeaderImage.getDrawable();}@Overrideprotected int getDefaultDrawableResId() {//返回   自定义动画布局return R.drawable.ptr_animation;}@Overrideprotected void onLoadingDrawableSet(Drawable imageDrawable) {}@Overrideprotected void onPullImpl(float scaleOfLayout) {}@Overrideprotected void pullToRefreshImpl() {}//刷新的时候@Overrideprotected void refreshingImpl() {mAnimationDrawable.start();//开启动画}@Overrideprotected void releaseToRefreshImpl() {}@Overrideprotected void resetImpl() {}
}

anim.xml:

<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"android:oneshot="false"   ><item android:drawable="@drawable/ptr_img_0" android:duration="10"></item><item android:drawable="@drawable/ptr_img_1" android:duration="10"></item><item android:drawable="@drawable/ptr_img_2" android:duration="10"></item><item android:drawable="@drawable/ptr_img_3" android:duration="10"></item><item android:drawable="@drawable/ptr_img_4" android:duration="10"></item><item android:drawable="@drawable/ptr_img_5" android:duration="10"></item><item android:drawable="@drawable/ptr_img_6" android:duration="10"></item><item android:drawable="@drawable/ptr_img_7" android:duration="10"></item><item android:drawable="@drawable/ptr_img_8" android:duration="10"></item><item android:drawable="@drawable/ptr_img_9" android:duration="10"></item><item android:drawable="@drawable/ptr_img_10" android:duration="10"></item><item android:drawable="@drawable/ptr_img_11" android:duration="10"></item><item android:drawable="@drawable/ptr_img_12" android:duration="10"></item><item android:drawable="@drawable/ptr_img_13" android:duration="10"></item><item android:drawable="@drawable/ptr_img_14" android:duration="10"></item><item android:drawable="@drawable/ptr_img_15" android:duration="10"></item><item android:drawable="@drawable/ptr_img_16" android:duration="10"></item><item android:drawable="@drawable/ptr_img_17" android:duration="10"></item></animation-list>