dependencies {
    implementation 'com.github.dkzwm:srl-core:1.7.2.4'
    implementation 'com.github.dkzwm:srl-ext-classics:1.7.2.4'
    implementation 'com.github.dkzwm:srl-ext-material:1.7.2.4'
    implementation 'com.github.dkzwm:srl-ext-dynamic-rebound:1.7.2.4'
    implementation 'com.github.dkzwm:srl-ext-horizontal:1.7.2.4'
    implementation 'com.github.dkzwm:srl-ext-two-level:1.7.2.4'
    implementation 'com.github.dkzwm:srl-ext-util:1.7.2.4'
}

<?xml version="1.0" encoding="utf-8"?>
<me.dkzwm.widget.srl.SmoothRefreshLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:app="http://schemas.android.com/apk/res-auto"
	android:id="@+id/refreshLayout"
	android:layout_width="match_parent"
	android:layout_height="match_parent">
	<TextView
		android:layout_width="match_parent"
		android:layout_height="match_parent"/>
</me.dkzwm.widget.srl.SmoothRefreshLayout>

SmoothRefreshLayout refreshLayout = (SmoothRefreshLayout)findViewById(R.id.smoothRefreshLayout);
refreshLayout.setHeaderView(new ClassicHeader(this));
refreshLayout.setOnRefreshListener(new RefreshingListenerAdapter() {
	@Override
	public void onRefreshing() {
		mHandler.postDelayed(new Runnable() {
			@Override
			public void run() {
				refreshLayout.refreshComplete();
			}
		}, 4000);
	}
});

public interface IRefreshView <T extends IIndicator> {    

    byte TYPE_HEADER = 0;
    byte TYPE_FOOTER = 1;

    byte STYLE_DEFAULT = 0;
    byte STYLE_SCALE = 1;
    byte STYLE_PIN = 2;
    byte STYLE_FOLLOW_SCALE = 3;
    byte STYLE_FOLLOW_PIN = 4;
    byte STYLE_FOLLOW_CENTER = 5;

    /**
     * 返回是头部视图还是尾部视图;
     */
    int getType();

    /**
     * 一般情况都是View实现本接口，所以返回this;
     */
    View getView();

    /**
     * 获取视图样式，自1.4.8版本后支持6种样式，STYLE_DEFAULT、STYLE_SCALE、STYLE_PIN、STYLE_FOLLOW_SCALE、STYLE_FOLLOW_PIN、STYLE_FOLLOW_CENTER;
     */
    int getStyle();

    /**
     * 获取视图的自定义高度，当视图样式为STYLE_SCALE和STYLE_FOLLOW_SCALE时，必须返回一个确切且大于0的值，使用横向刷新库时，该属性实际应该返回的是视图的宽度;
     * 自1.6.1版本开始，如果想要当前视图铺满布局即MATCH_PARENT，那么支持返回ViewGroup.LayoutParams.MATCH_PARENT对应的值即`-1`;
     */
    int getCustomHeight();

    /**
     * 手指离开屏幕;
     */
    void onFingerUp(SmoothRefreshLayout layout, T indicator);

    /**
     * 重置视图;
     */
    void onReset(SmoothRefreshLayout layout);

    /**
     * 重新配置视图，准备刷新;
     */
    void onRefreshPrepare(SmoothRefreshLayout layout);

    /**
     * 开始刷新;
     */
    void onRefreshBegin(SmoothRefreshLayout layout, T indicator);

    /**
     * 刷新完成;
     */
    void onRefreshComplete(SmoothRefreshLayout layout,boolean isSuccessful);

    /**
     * 当头部或者尾部视图发生位置变化;
     */
    void onRefreshPositionChanged(SmoothRefreshLayout layout, byte status, T indicator);

    /**
     * 当头部或者尾部视图仍然处于处理事务中，这时候移动其他刷新视图则会调用该方法;
     * 在1.4.6版本新加入;
     */
    void onPureScrollPositionChanged(SmoothRefreshLayout layout, byte status, T indicator);
}

        SmoothRefreshLayout.setDefaultCreator(new IRefreshViewCreator() {
            @Override
            public IRefreshView<IIndicator> createHeader(SmoothRefreshLayout layout) {
                ClassicHeader header = new ClassicHeader(layout.getContext());
                return header;
            }

            @Override
            public IRefreshView<IIndicator> createFooter(SmoothRefreshLayout layout) {
                ClassicFooter footer = new ClassicFooter(layout.getContext());
                return footer;
            }
        });

        ClassicHeader header = new ClassicHeader(mRefreshLayout.getContext());
        mRefreshLayout.setHeaderView(header);
        ClassicFooter footer = new ClassicFooter(mRefreshLayout.getContext());
        mRefreshLayout.setFooterView(footer);

       mRefreshLayout.setIndicatorOffsetCalculator(new IIndicator.IOffsetCalculator() {
           @Override
           public float calculate(@IIndicator.MovingStatus int status, int currentPos, float offset) {
               if (status == IIndicator.MOVING_HEADER) {
                   if (offset < 0) {
                       //如果希望拖动缩回时类似QQ一样没有阻尼效果，阻尼效果只存在于下拉则可以在此返回offset
                       //如果希望拖动缩回时类似QQ一样有阻尼效果，那么请注释掉这个判断语句
                       return offset;
                   }
                   return (float) Math.pow(Math.pow(currentPos / 2, 1.28d) + offset, 1 / 1.28d) * 2 - currentPos;
               } else if (status == IIndicator.MOVING_FOOTER) {
                   if (offset > 0) {
                       //如果希望拖动缩回时类似QQ一样没有阻尼效果，阻尼效果只存在于上拉则可以在此返回offset
                       //如果希望拖动缩回时类似QQ一样有阻尼效果，那么请注释掉这个判断语句
                       return offset;
                   }
                   return -((float) Math.pow(Math.pow(currentPos / 2, 1.28d) - offset, 1 / 1.28d) * 2 - currentPos);
               } else {
                   if (offset > 0) {
                       return (float) Math.pow(offset, 1 / 1.28d) * 2;
                   } else if (offset < 0) {
                       return -(float) Math.pow(-offset, 1 / 1.28d) * 2;
                   } else {
                       return offset;
                   }
               }
           }
       });

MIT License

Copyright (c) 2017 dkzwm
Copyright (c) 2015 liaohuqiu.net

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.