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;
    //desc start
    //added in version 1.4.8
    byte STYLE_PIN = 2;
    byte STYLE_FOLLOW_SCALE = 3;
    byte STYLE_FOLLOW_PIN = 4;
    byte STYLE_FOLLOW_CENTER = 5;
    //desc end

    /**
     * Get the view type.
     *
     * @return type {@link #TYPE_HEADER}, {@link #TYPE_FOOTER}.
     */
    @RefreshViewType
    int getType();

    /**
     * Get the view style. If return {@link #STYLE_SCALE} SmoothRefreshLayout will dynamically
     * change the height, so the performance will be reduced. If return {@link #STYLE_FOLLOW_SCALE}
     * , when the moved position large than the view height, SmoothRefreshLayout will dynamically
     * change the height, so the performance will be reduced.
     *
     * @return style {@link #STYLE_DEFAULT}, {@link #STYLE_SCALE}, {@link #STYLE_PIN},
     * {@link #STYLE_FOLLOW_SCALE}, {@link #STYLE_FOLLOW_PIN}, {@link #STYLE_FOLLOW_CENTER}.
     */
    @RefreshViewStyle
    int getStyle();

    /**
     * Get the custom height,  When the return style is {@link #STYLE_SCALE} or
     * {@link #STYLE_FOLLOW_SCALE} , you must return a accurate height<br/>
     * Since version 1.6.1, If you want the height equal to the srl height, you can return `-1`
     * {@link android.view.ViewGroup.LayoutParams#MATCH_PARENT}
     *
     * @return Custom height
     */
    int getCustomHeight();

    /**
     * Get the target view.
     *
     * @return The returned view must be the view that will be added to the Layout
     */
    @NonNull
    View getView();

    /**
     * This method will be triggered when the touched finger is lifted.
     *
     * @param layout    The layout {@link SmoothRefreshLayout}
     * @param indicator The indicator {@link IIndicator}
     */
    void onFingerUp(SmoothRefreshLayout layout, T indicator);

    /**
     * This method will be triggered when the refresh state is reset to
     * {@link SmoothRefreshLayout#SR_STATUS_INIT}.
     *
     * @param layout The layout {@link SmoothRefreshLayout}
     */
    void onReset(SmoothRefreshLayout layout);

    /**
     * This method will be triggered when the frame is ready to refreshing.
     *
     * @param layout The layout {@link SmoothRefreshLayout}
     */
    void onRefreshPrepare(SmoothRefreshLayout layout);

    /**
     * This method will be triggered when the frame begin to refresh.
     *
     * @param layout    The layout {@link SmoothRefreshLayout}
     * @param indicator The indicator {@link IIndicator}
     */
    void onRefreshBegin(SmoothRefreshLayout layout, T indicator);

    /**
     * This method will be triggered when the frame is refresh completed.
     *
     * @param layout       The layout {@link SmoothRefreshLayout}
     * @param isSuccessful The layout refresh state
     */
    void onRefreshComplete(SmoothRefreshLayout layout, boolean isSuccessful);

    /**
     * This method will be triggered when the position of the refresh view changes.
     *
     * @param layout    The layout {@link SmoothRefreshLayout}
     * @param status    Current status @see{@link SmoothRefreshLayout#SR_STATUS_INIT},
     *                  {@link SmoothRefreshLayout#SR_STATUS_PREPARE},
     *                  {@link SmoothRefreshLayout#SR_STATUS_REFRESHING},
     *                  {@link SmoothRefreshLayout#SR_STATUS_LOADING_MORE},
     *                  {@link SmoothRefreshLayout#SR_STATUS_COMPLETE}.
     * @param indicator The indicator {@link IIndicator}
     */
    void onRefreshPositionChanged(SmoothRefreshLayout layout, byte status, T indicator);

    /**
     * Before the transaction of the refresh view has not yet been processed completed。
     * This method will be triggered when the position of the other refresh view changes.<br/>
     * <p>
     * Added in version 1.4.6
     *
     * @param layout    The layout {@link SmoothRefreshLayout}
     * @param status    Current status @see{@link SmoothRefreshLayout#SR_STATUS_INIT},
     *                  {@link SmoothRefreshLayout#SR_STATUS_PREPARE},
     *                  {@link SmoothRefreshLayout#SR_STATUS_REFRESHING},
     *                  {@link SmoothRefreshLayout#SR_STATUS_LOADING_MORE},
     *                  {@link SmoothRefreshLayout#SR_STATUS_COMPLETE}.
     * @param indicator The indicator {@link IIndicator}
     */
    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) {
                       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) {
                       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.