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public static List<Track> copyList(List<Track> list){
        Parcel p = Parcel.obtain();
        p.writeTypedList(list);
        p.setDataPosition(0);
        List<Track> result = null;
        try{
            result = p.createTypedArrayList(Track.CREATOR);
        }catch (Exception e){
            e.printStackTrace();
        }

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                BigDecimal re = new BigDecimal("1.256");
                //向上取值 1.26
                Log.d("wcy", "re ROUND_CEILING = " + re.setScale(2, BigDecimal.ROUND_CEILING));
                //向下取值 1.25
                Log.d("wcy", "re ROUND_FLOOR = " + re.setScale(2, BigDecimal.ROUND_FLOOR));
                re =  new BigDecimal("1.256");
                //向 0 的方向 舍去后面 1.25
                Log.d("wcy", "re ROUND_DOWN = " + re.setScale(2, BigDecimal.ROUND_DOWN));
                re =  new BigDecimal("-1.256");

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public class MultiDexUtil {
    private static final String EXTRACTED_NAME_EXT = ".classes";
    private static final String EXTRACTED_SUFFIX = ".zip";

    private static final String SECONDARY_FOLDER_NAME = "code_cache" + File.separator +
            "secondary-dexes";

    private static final String PREFS_FILE = "multidex.version";
    private static final String KEY_DEX_NUMBER = "dex.number";

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import java.lang.reflect.Method;

public class SystemPropertiesProxy {

	/**
	 * This class cannot be instantiated
	 */
	private SystemPropertiesProxy() {
	}

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You can use this class to realize a simple sectioned RecyclerView.Adapter without changing your code.

The RecyclerView should use a LinearLayoutManager. You can use this code also with the TwoWayView with the ListLayoutManager (https://github.com/lucasr/twoway-view)

This is a porting of the class SimpleSectionedListAdapter provided by Google

Example:

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.2//EN" "http://www.puppycrawl.com/dtds/configuration_1_2.dtd">

<!-- Generated by RHY @will_awoke -->

<module name="Checker">

    <property name="charset" value="UTF-8"/>
    <property name="severity" value="warning"/>

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<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="rectangle">
            <solid android:color="#d6d6d6" />
        </shape>
    </item>
    <item android:top="1dp"
        android:bottom="1dp"
        android:left="1dp"

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public class RootUtil {
    public static boolean isDeviceRooted() {
        return checkRootMethod1() || checkRootMethod2() || checkRootMethod3();
    }

    private static boolean checkRootMethod1() {
        String buildTags = android.os.Build.TAGS;
        return buildTags != null && buildTags.contains("test-keys");
    }

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="your.package.name" >
	
	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
	<uses-permission android:name="android.permission.INTERNET" />
	<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

    <application
        android:allowBackup="true"