kotlin 引用java jar kotlin调用js

#关于Android新语言Kotlin初识

2017年5月的IO大会上,Google宣布,kotlin成为开发Android的一级编程语言.

Kotlin不仅可以再JVM上运行,还可以直接将Kotlin源代码转换成JavaScript,理论上将,kotlin可以在任何支持JavaScript的环境中运行,例如WEB应用,reactNatice(Android和IOS),微信公众号,微信小程序,Node.js等,另外,还有一些地方是JavaScript做不到的,如开发本地应用,但kotlin可以做到,kotlin不仅仅可以生成JavaScript代码,还可以直接编译成本地代码,如Windows的exe文件,iOS APP等,这样一来,kotlin几乎和可以开发所有类型的应用.

---

##kotlin的优势:

• 容易学习

kotlin是一门包含很多函数式编程思想的面相对象编程语言

• 轻量级

相比其他编程语言,kotlin的函数库更小,小于7000个

• 高度可互操作性:

kotlin可以和其他java类库友好且简单的进行互操作

• 继承Androidstudio及gradle

专门的插件,和工具

• 其他语法层面的特性,如数据模型类,空类型安全,扩展函数等

kotlin能做什么

• 服务端开发

kotlin是基于JVM的编程语言,自然可以使用所有基于JVM的服务端框架 例如:spring

• 以JavaScript方式运行

kotlin提供了生成JavaScript源代码的能力

• 开发Android App

kotlin和java源代码可以在同一个工程中,可以联合进行调试

##kotlin的基本语法

• 定义变量

// 定义变量
var m: Int? = 0
// 自动推导变量的数据类型
var n = 10
// 定义常量
val f = 30
// 定义数组
var arr1 = arrayOf(1, 2, 3, 4)
var arr3: IntArray? = null
// 定义集合
var list1 = arrayListOf<String>()
var list2: ArrayList<String>? = null
// 定义字符串
var s1 = "Hello \nworld"
var s2: String = "世界\n 你好"
var s3 = """
        hello
            world
                I love you.
"""
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• 定义方法

// 定义普通方法
fun test() {

}

// 定义带返回值方法
fun test1(): String {
    return "返回值"
}
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• get,set方法

var address: String = ""
    get() {
        println("get Method is run")
        return if (field.contains("北京市")) {
            field.replace("北京市", "许昌市")
        } else {
            field
        }

    }
    set(value) {
        println("setMethod is run")
        field = value
    }

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• 定义构造器

// 一级构造器
class KotlinBean constructor() {

}
// 二级构造器
class KotlinBean constructor() {
    constructor(index: Int) : this()
}
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• 数值类型

数据类型	占用字节数
Double	8
Float	4
Long	8
Int	4
Short	2
Byte	1

• 字符串模板

// 字符串模板 添加占位符 $
    override fun toString(): String {
        return "KotlinBean(m=$m, n=$n, f=$f, arr1=${Arrays.toString(arr1)}, arr3=${Arrays.toString(arr3)}, list1=$list1, list2=$list2)"
    }

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• if语句

// 定义带返回值方法
fun test1(): String {
    return if (n > 10) {
        "ssss"
    } else {
        "返回值"
    }
}
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• when语句(替代原来的switch语句)

rg_navigation.setOnCheckedChangeListener { group, checkedId ->
        when (checkedId) {
            R.id.rb_home -> {
                switchTab(0)
            }
            R.id.rb_mirror -> {
                switchTab(1)
            }
            R.id.rb_bbs -> {
                switchTab(2)
            }
            R.id.rb_mine -> {
                switchTab(3)
            }

        }
    }
    
       fun test2(n: Int) {
    when (n) {
        1 -> {
        }
        2 -> {
        }
        // 使用in关键字
        in 3..5 -> {

        }
        // 使用函数表达式的返回值
        test3() -> {
            
        }
        else -> {

        }
    }

}
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• for循环

fun test4() {
    // 强循环,直接遍历
    list1.forEach { t: String? -> println(t) }
    for (s: String in list1) {
        println(s)
    }
    // 根据角标遍历
    for (i in list1.indices) {
        println(list1[i])
    }
    // 根据角标遍历,同时获取角标和对应的元素值
    for ((index, value) in list1.withIndex()) {
        println(index)
        println(value)
    }
}
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• 修饰符

1. private 仅在类的内部可以访问
2. protected 类似private,但在子类中也可以访问
3. internal 任何在模块内部类都可以访问
4. public 任何类都可以访问

• 类的继承

与Java不同,kotlin类的继承需要使用冒号(:),冒号后面需要调用父类的构造器

需要注意的是kotlin默认是的class是final的,也就是说默认class不允许继承,需要显示的使用open关键字允许继承class

open class KotlinBean constructor() {

constructor(index: Int) : this()

}

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• 重写方法 & 重写属性

在kotlin中,不仅类默认是不可继承的,连方法默认也是不可重写的.因此,如果要在子类中重写方法,就需要在父类相应的方法前面加open关键字,而且要在子类重写的方法前面加override关键字

• 接口

kotlin中的接口与Java中的类似,使用interface关键字声明.一个类可以实现多个接口,并且接口中的属性和方法都是open的

interface KotlinInterfaceTest {
fun getUserInfo()
    // 在kotlin中,允许接口的方法包含默认的方法体
fun setUserInfo(name: String) {
    val userBean = UserBean()
    userBean.name = name
}
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}

• null 值安全性

在java中饱受null异常的困扰,在kotlin中可以试图解决这个问题

kotlin中导致NPE情况

1. 明确调用throw NullPointerException()
2. 使用!! 操作符
3. 外部的Java代码导致
4. 初始化过程中存在某些数据不一致

• 开始使用kotlin进行Android开发

1. 创建一个应用

勾选kotlin选项,点击Next,知道项目创建完成

1. 编写XML文件

1. 在activity中设置UI显示

• 其他示例

class HomeFragment @SuppressLint("ValidFragment")
private constructor() : Fragment() {
    var value: HomeFragment? = null
    var imageList = arrayListOf<Int>()
    lateinit var mContext: Context
    lateinit var mHomeAdapter: HomeAdapter

    private object Holder {
        val INSTANCE = HomeFragment()
    }

    companion object Factory {
        fun getInstance(): HomeFragment {
            return Holder.INSTANCE
        }

    }

    override fun onAttach(context: Context?) {
        super.onAttach(context)
        mContext = context!!
    }

    override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View? {


        return inflater!!.inflate(R.layout.fragment_home, container, false)
    }

    override fun onViewCreated(view: View?, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        initView()
        initData()
    }

    private fun initView() {
        banner.setImageLoader(GlideImageLoader())
        imageList.add(R.mipmap.ic_driver)
        imageList.add(R.mipmap.ic_police)
        imageList.add(R.mipmap.ic_trance)
        banner.setImages(imageList).start()
        rv_top_lines.setHasFixedSize(true)
        rv_top_lines.layoutManager = LinearLayoutManager(mContext)
    }

    class MyLinear2(context: Context?) : LinearLayoutManager(context) {
        override fun canScrollVertically(): Boolean {
            return false
        }

    }

    private fun initData() {
        mHomeAdapter = HomeAdapter()
        rv_top_lines.adapter = mHomeAdapter

        HttpManager.getInstance().getRetrofit().create(IApiServices::class.java).getHostList()
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .doOnNext { t: BaseBean<List<MovieBean>>? ->
                    if (t != null) {
                        val data = t.data
                        data.forEach { t -> println(t.toString()) }
                    }
                }.subscribe(object : Observer<BaseBean<List<MovieBean>>> {
            override fun onSubscribe(d: Disposable) {
                println("onSubscribe")
            }

            override fun onError(e: Throwable) {
                println("onError" + e.message)
                Toast.makeText(mContext, e.message, Toast.LENGTH_SHORT).show()
            }

            override fun onNext(t: BaseBean<List<MovieBean>>) {
                println("onNext" + t.toString())
                mHomeAdapter.setNewData(t.data)
            }

            override fun onComplete() {
                println("onComplete")
                Toast.makeText(mContext, "onComplete", Toast.LENGTH_SHORT).show()

            }
        })
    }

    override fun onStart() {
        super.onStart()
        //开始轮播
        banner.startAutoPlay()
    }

    override fun onStop() {
        super.onStop()
        //结束轮播
        banner.stopAutoPlay()
    }
}
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---

• home页tab切换

package com.bidostar.kotlindemo.activity

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import com.bidostar.kotlindemo.R
import com.bidostar.kotlindemo.fragment.BbsFragment
import com.bidostar.kotlindemo.fragment.HomeFragment
import com.bidostar.kotlindemo.fragment.MineFragment
import com.bidostar.kotlindemo.fragment.MirrorFragment
import kotlinx.android.synthetic.main.activity_home.*

class HomeActivity : AppCompatActivity() {
    //  1. lateinit 延迟加载
    //  2.lateinit 只能修饰, 非kotlin基本类型
    lateinit var mHomeFragment: HomeFragment
    lateinit var mMirrorFragment: MirrorFragment
    lateinit var mBbsFragment: BbsFragment
    lateinit var mMineFragment: MineFragment

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_home)
        initView()
        val transaction = supportFragmentManager.beginTransaction()
        transaction.add(R.id.fl_content, mHomeFragment, "home")
        transaction.add(R.id.fl_content, mMirrorFragment, "mirror")
        transaction.add(R.id.fl_content, mBbsFragment, "bbs")
        transaction.add(R.id.fl_content, mMineFragment, "mine")
        transaction.commitAllowingStateLoss()

        rg_navigation.setOnCheckedChangeListener { group, checkedId ->
            when (checkedId) {
                R.id.rb_home -> {
                    switchTab(0)
                }
                R.id.rb_mirror -> {
                    switchTab(1)
                }
                R.id.rb_bbs -> {
                    switchTab(2)
                }
                R.id.rb_mine -> {
                    switchTab(3)
                }

            }
        }
        switchTab(0)

    }

    private fun initView() {
        mHomeFragment = HomeFragment.getInstance()
        mMirrorFragment = MirrorFragment.getInstance()
        mBbsFragment = BbsFragment.getInstance()
        mMineFragment = MineFragment.getInstance()
    }


    private fun switchTab(index: Int) {
        val transaction = supportFragmentManager.beginTransaction()
        when (index) {
            0 -> {
                transaction.show(mHomeFragment)
                        .hide(mMirrorFragment)
                        .hide(mBbsFragment)
                        .hide(mMineFragment)
                        .commitAllowingStateLoss()
            }
            1 -> {
                transaction.show(mMirrorFragment)
                        .hide(mHomeFragment)
                        .hide(mBbsFragment)
                        .hide(mMineFragment)
                        .commitAllowingStateLoss()
            }
            2 -> {
                transaction.show(mBbsFragment)
                        .hide(mHomeFragment)
                        .hide(mMirrorFragment)
                        .hide(mMineFragment)
                        .commitAllowingStateLoss()
            }
            3 -> {
                transaction.show(mMineFragment)
                        .hide(mHomeFragment)
                        .hide(mMirrorFragment)
                        .hide(mBbsFragment)
                        .commitAllowingStateLoss()
            }
        }
    }
}
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• adapter使用

package com.bidostar.kotlindemo.adapter

import com.bidostar.kotlindemo.R
import com.bidostar.kotlindemo.bean.MovieBean
import com.bumptech.glide.Glide
import com.chad.library.adapter.base.BaseQuickAdapter
import com.chad.library.adapter.base.BaseViewHolder

/**
 * @author zsh27
 * @date 2017/12/14.
 * description .
 * @since 0
 */
class HomeAdapter(layoutResId: Int) : BaseQuickAdapter<MovieBean, BaseViewHolder>(layoutResId) {
    init {

    }

    constructor() : this(R.layout.home_movie_item)

    override fun convert(helper: BaseViewHolder?, item: MovieBean?) {
        if (item != null) {
            helper?.setText(R.id.tv_name, item.movieName)
            helper?.setText(R.id.tv_desc, item.name)
            Glide.with(mContext)
                    .load(item.img)
                    .into(helper?.getView(R.id.iv_cover))
        }
    }

}

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项目实战

kotlin&java混编

1. 项目配置

project级的gradle配置
dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'
        classpath 'com.tencent.bugly:tinker-support:1.1.1'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
        classpath 'com.jakewharton:butterknife-gradle-plugin:8.4.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
    
module级的gradle配置
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-kapt'

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    testImplementation "junit:junit:$rootProject.dependVersion.junit"
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation "com.android.support:design:$rootProject.dependVersion.support"
    implementation "com.android.support.constraint:constraint-layout:$rootProject.dependVersion.constraint_layout"
    }

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1. 常量类

object NetConstant {

/**
 * 连接超时
 */
const val DEFAULT_CONNECT_TIME_OUT = 15L
/**
 * 读取超时
 */
const val DEFAULT_READ_TIME_OUT = 15L
/**
 * 写入超时
 */
const val DEFAULT_WRITE_TIME_OUT = 30L

}
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1. 单例类

class HttpManager private constructor() {
        /**
     * 构造方法私有
     */
    init {
        Logger.d("HttpManager:" + "init:" + "_debug:" + Debug)
        initRetrofit()
    }
    companion object {
    /**
     * 单例对象
     */
    var BaseUrl: String? = null
    var BaseResourceUrl: String? = null
    var Debug = false
    var InterceptorList: List<Interceptor>? = null
    var NetworkInterceptorList: List<Interceptor>? = null
    /**
     * 获取HttpManager
     *
     * @return HttpManager实例 instance
     */
    val instance: HttpManager
        get() {
            return Holder.INSTANCE
        }

    fun paramsBuild(): HttpManager.ParamsBuild {
        return HttpManager.ParamsBuild()
    }

    /**
     * 自定义Retrofit示例
     * 可以设置一些自定义参数,通过buildRetrofit()构建Retrofit实例
     * 或者通过buildApiService()直接构建一个网络请求接口
     *
     * @return 自定义RetrofitBuilder http builder . builder
     */
    fun newBuilder(): HttpBuilder.Builder {
        return HttpBuilder.Builder()
        }
    }

}

使用方法
1. java文件中使用
     HttpManager.Companion.getInstance()
            .create(IAppServices.class)
            .getDeviceActivateStatus()
            .compose(RxSchedulers.INSTANCE.<com.bidostar.netlibrary.BaseResponse<DeviceStatusBean>>applyIoSchedulers())
            .compose(this.<com.bidostar.netlibrary.BaseResponse<DeviceStatusBean>>bindToLifecycle())
2. kotlin文件中使用
    HttpManager.instance
            .create(IAppServices::class.java)
            .deleteDevicePic(mDeviceCode, bean.id.toLong())
            .compose(RxSchedulers.applyIoSchedulers())
            .compose(this.bindToLifecycle())


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1. view控件

1. findViewById()

var mTvTitle = findViewById(R.id.tv_title)
    var mIvBack = findViewById(R.id.iv_back)

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1. kotlin注解方式

import kotlinx.android.synthetic.main.activity_mirror_album_detail.*

mAdapter = AlbumPagerAdapter(mContext)
view_pager.adapter = mAdapter
view_pager.addOnPageChangeListener(this)
mAdapter!!.setNewData(mItemList)
view_pager.currentItem = mIndex

mIvBack.setOnClickListener {
    finish()
}
tv_delete.setOnClickListener(this)
tv_download.setOnClickListener(this)

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1. mvp使用

M层
class DeviceCaptureModelImpl : BaseModel(), DeviceCaptureContract.IDeviceCaptureModel {

    override fun getLastPicture(alarmId: Int, deviceCode: Long, alarmDay: String, pageSize: Int, respType: String): Observable<BaseResponse<List<MirrorAlbumBean>>> {
        return HttpManager.instance
                .create(IAppServices::class.java)
                .getDeviceAlarm(alarmId, deviceCode, alarmDay, pageSize, respType)
                .compose(RxSchedulers.applyIoSchedulers())
    }

    override fun getDeviceStatus(deviceCode: Long, rousing: Boolean): Observable<BaseResponse<Int>> {
        return HttpManager.instance.create(IAppServices::class.java)
                .deviceStatus(deviceCode, rousing)
                .compose(RxSchedulers.applyIoSchedulers())
    }

    override fun devicecapture(deviceCode: Long): Observable<BaseResponse<CaptureBean>> {
        return HttpManager.instance.create(IAppServices::class.java)
                .deviceCapture(deviceCode)
                .compose(RxSchedulers.applyIoSchedulers())
    }

    override fun sendMessage(deviceCode: Long, content: String): Observable<BaseResponse<String>> {
        return HttpManager.instance.create(IAppServices::class.java)
                .sendTextToDevice(deviceCode, content)
                .compose(RxSchedulers.applyIoSchedulers())
    }
}

P层
class DeviceCapturePresenterImpl : BasePresenter<DeviceCaptureContract.IDeviceCaptureView, DeviceCaptureModelImpl>(),
    DeviceCaptureContract.IDeviceCapturePresenter {
override fun getDeviceStatus(deviceCode: Long, rousing: Boolean) {
    m.getDeviceStatus(deviceCode, rousing)
            .compose(RxSchedulers.applyIoSchedulers())
            .subscribe(object : BaseObserver<Int>() {
                override fun handleResult(response: BaseResponse<Int>) {
                    when (response.resultCode) {
                        BaseResponse.RET_HTTP_STATUS_OK -> {
                            when (response.data) {
                                BaseResponse.RET_HTTP_STATUS_OK -> {
                                    v.onLine()
                                }
                                BaseResponse.RET_MIRROR_STATUS_NO -> {
                                    v.offLine()
                                }
                                BaseResponse.RET_MIRROR_STATUS_YES -> {
                                    v.onStarting()
                                }
                            }
                        }
                        BaseResponse.RET_TIMEOUT_CODE -> {
                            v.timeOut()
                        }
                        else -> {
                            v.onError()
                            v.showErrorTip(response.errorMsg)
                        }
                    }
                }
            })
    }
}

V层
@Route(path = ARouterConstant.DEVICE_CAPTURE)
class DeviceCaptureActivity : BaseMvpActivity<DeviceCapturePresenterImpl>(), DeviceCaptureContract.IDeviceCaptureView,
        Handler.Callback, DeviceConnectDialog.onMirrorConnectClickListener {

    private lateinit var mTvTitle: TextView
    private lateinit var mIvBack: ImageView
    private var mCar: Car? = null
    private var mHandler: WeakRefHandler? = null
    private var mIsCapture = false
    private var mContent = ""
    private var mConnectDialog: DeviceConnectDialog? = null
    override fun newPresenter(): DeviceCapturePresenterImpl {
        return DeviceCapturePresenterImpl()
    }

    override fun getLayoutView(savedInstanceState: Bundle?): Int {
        return R.layout.activity_device_capture
    }

    override fun initView(savedInstanceState: Bundle?) {
        mIvBack = findViewById(R.id.iv_back)
        mTvTitle = findViewById(R.id.tv_title)
        mIvBack.setOnClickListener {
            finish()
        }
        mTvTitle.text = "后视镜远程操控"
        mIvBack.setOnClickListener {
            finish()
        }
        ivCapture.setOnClickListener {
            mIsCapture = true
            if (mCar?.deviceType != 1) {
                DialogUtils.showBindDialog(mContext)
                return@setOnClickListener
            }
            ivCapture.isClickable = false
            showMirrorConnectDialog()
            p.getDeviceStatus(mCar!!.deviceCode, true)
        }
        ivAlbum.setOnClickListener {
            if (mCar?.getDeviceType() != 1) {
                DialogUtils.showBindDialog(mContext)
                return@setOnClickListener
            }
            ARouter.getInstance().build(ARouterConstant.DEVICE_CAPTURE_ALBUM)
                    .navigation()
        }
        tvSendMessage.setOnClickListener {
            mIsCapture = false
            if (mCar!!.deviceType != 1) {
                DialogUtils.showBindDialog(mContext)
                return@setOnClickListener
            }
            mContent = etMessage.text.toString().trim()
            if (TextUtils.isEmpty(mContent)) {
                showToast("消息内容不能为空")
                return@setOnClickListener
            }
            tvSendMessage.isClickable = false
            showMirrorConnectDialog()
            p.getDeviceStatus(mCar!!.deviceCode, true)
        }
    }

    override fun initData() {
        mCar = ApiCarDb.getCar(mContext)
        mHandler = WeakRefHandler(this)
        if (mCar?.deviceType == 1) {
            p.getLastPicture(207, mCar!!.deviceCode, "", 1, "list")
        }

    }
}

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1. java文件转换成kotlin

java文件
    public class AlbumPagerAdapter extends PagerAdapter {
    private List<MirrorAlbumItemBean> mDataList;
    private Context mContext;
    private final LayoutInflater mInflater;

    public AlbumPagerAdapter(Context context) {
        mContext = context;
        mInflater = LayoutInflater.from(mContext);
        if (mDataList == null) {
            mDataList = new ArrayList<>();
        }
    }

    public void setNewData(List<MirrorAlbumItemBean> list) {
        if (mDataList == null) {
            mDataList = new ArrayList<>();
        }
        mDataList.clear();
        mDataList.addAll(list);
        notifyDataSetChanged();
    }

    @Override
    public int getCount() {
        return mDataList.size();
    }

    @Override
    public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
        return object == view;
    }

    @NonNull
    @Override
    public Object instantiateItem(@NonNull ViewGroup container, int position) {
        MirrorAlbumItemBean bean = mDataList.get(position);
        View inflate = mInflater.inflate(R.layout.device_album_viewpager_item_layout, container, false);
        ImageView imageView = inflate.findViewById(R.id.pv_image);
        TextView tvLocation = inflate.findViewById(R.id.tv_location);

        TextView tvTime = inflate.findViewById(R.id.tv_time);
        tvLocation.setText(TextUtils.isEmpty(bean.getLocation()) ? "位置位置" : bean.getLocation());
        tvTime.setText(bean.getAlarmTime());

        Glide.with(mContext)
                .load(bean.getUrl())
                .into(imageView);
        container.addView(inflate);
        return inflate;
    }

    @Override
    public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
        container.removeView((View) object);
    }
}


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```

class AlbumPagerAdapter(private val mContext: Context) : PagerAdapter() {
    private var mDataList: MutableList<MirrorAlbumItemBean>? = null
    private val mInflater: LayoutInflater = LayoutInflater.from(mContext)

    init {
        if (mDataList == null) {
            mDataList = ArrayList()
        }
    }

    fun setNewData(list: List<MirrorAlbumItemBean>) {
        if (mDataList == null) {
            mDataList = ArrayList()
        }
        mDataList!!.clear()
        mDataList!!.addAll(list)
        notifyDataSetChanged()
    }

    fun removeData(position: Int) {
        if (mDataList!!.size > position) {
            mDataList!!.removeAt(position)
        }
        notifyDataSetChanged()
    }

    override fun getCount(): Int {
        return mDataList!!.size
    }

    override fun isViewFromObject(view: View, `object`: Any): Boolean {
        return `object` === view
    }

    override fun instantiateItem(container: ViewGroup, position: Int): Any {
        val bean = mDataList!![position]
        val inflate = mInflater.inflate(R.layout.device_album_viewpager_item_layout, container, false)
        val imageView = inflate.findViewById<ImageView>(R.id.pv_image)
        val tvLocation = inflate.findViewById<TextView>(R.id.tv_location)

        val tvTime = inflate.findViewById<TextView>(R.id.tv_time)
        tvLocation.text = if (TextUtils.isEmpty(bean.location)) "未知位置" else bean.location
        tvTime.text = bean.alarmTime

        Glide.with(mContext)
                .load(bean.url)
                .into(imageView)
        container.addView(inflate)
        return inflate
    }

    override fun destroyItem(container: ViewGroup, position: Int, `object`: Any) {
        container.removeView(`object` as View)
    }

    override fun getItemPosition(`object`: Any): Int {
        return PagerAdapter.POSITION_NONE
    }
}
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