参考饭否的项目练手的：Kotlin饭否

Kotlin学习的简易练手

一、AndroidStudio的gradle配置（重点部分都有双斜杠注释）

1、Module的gradle配置(重点是引入Kotlin以及Kotlin-extention)

apply plugin: 'com.android.application'//kotlin
apply plugin: 'kotlin-android'
//kotlinx-extention
apply plugin: 'kotlin-android-extensions'android {compileSdkVersion 27defaultConfig {applicationId "com.example.ktdemo"minSdkVersion 15targetSdkVersion 27versionCode 1versionName "1.0"testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"}buildTypes {release {minifyEnabled falseproguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'}}}dependencies {implementation fileTree(dir: 'libs', include: ['*.jar'])//noinspection GradleCompatibleimplementation 'com.android.support:appcompat-v7:27.1.1'//引入CardViewimplementation 'com.android.support:cardview-v7:27.1.1'implementation 'com.android.support.constraint:constraint-layout:1.1.3'testImplementation 'junit:junit:4.12'androidTestImplementation 'com.android.support.test:runner:1.0.2'androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'//kotlinimplementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"//designimplementation 'com.android.support:design:27.1.1'//okhttp3.0implementation 'com.squareup.okhttp3:okhttp:3.11.0'//gsonimplementation 'com.google.code.gson:gson:2.8.5'//picassoimplementation 'com.squareup.picasso:picasso:2.71828'
}apply plugin: 'kotlin-android-extensions'

2、Project的gradle配置

// Top-level build file where you can add configuration options common to all sub-projects/modules.buildscript {//kotlinext.kotlin_version ='1.2.30'repositories {google()jcenter()mavenCentral()//add repositories because greendao needed}dependencies {classpath 'com.android.tools.build:gradle:3.1.2'classpath 'com.github.dcendents:android-maven-gradle-plugin:2.0'//kotlinclasspath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"// NOTE: Do not place your application dependencies here; they belong// in the individual module build.gradle files}
}allprojects {repositories {google()jcenter()}
}task clean(type: Delete) {delete rootProject.buildDir
}

二、具体的相关代码

主Activity以及XML

package com.example.ktdemo.newsimport android.app.DatePickerDialog
import android.content.Intent
import android.os.Bundle
import android.support.v4.widget.SwipeRefreshLayout
import android.support.v7.app.AppCompatActivity
import android.support.v7.widget.LinearLayoutManager
import android.util.Log
import android.view.Menu
import android.view.MenuItem
import android.view.View
import com.example.ktdemo.R
import com.google.gson.Gson
import kotlinx.android.synthetic.main.activity_ui.*
import okhttp3.Call
import okhttp3.Callback
import okhttp3.OkHttpClient
import okhttp3.Response
import java.io.IOException
import java.sql.Date
import java.text.SimpleDateFormat
import java.util.*
import kotlin.collections.ArrayListclass UIActivity : AppCompatActivity(), OnRecyclerViewOnClickListener {override fun onItemClick(view: View, position: Int) {}private var postsList = ArrayList<FanfouPost>()private var y: Int = 2015private var m: Int = 9private var d: Int = 5private var adapter: RVAdapter? = nulloverride fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_ui)initView()val date = SimpleDateFormat("yyyy-MM-dd")val formatStr = date.format(Date())//获取数据val url: String = "http://blog.fanfou.com/digest/json/2018-02-11.daily.json"Log.d("zbv", "uri=$url")//使用匿名内部类（接口）HttpUtilsForKotlin.getokHttpAsync(OkHttpClient(), url, object : Callback {override fun onFailure(call: Call?, e: IOException?) {Log.d("zbv", "请求失败")}override fun onResponse(call: Call?, response: Response?) {val result = response!!.body()!!.string()Log.d("zbv", "result=$result")val gson = Gson()val javabeans = gson.fromJson<KotlinBeanGson>(result, KotlinBeanGson::class.java)Log.d("zbv", "javabeans$javabeans")val messages = javabeans.msgsfor (message: KotlinBeanGson.Message in messages) {val fanfou = FanfouPost(message.avatar, message.realname, message.msg, message.time, "")postsList.add(fanfou)}runOnUiThread(Runnable {adapter = RVAdapter(this@UIActivity, postsList)recycler_view.adapter = adapteradapter!!.setOnItemClickListener(this@UIActivity)})}})floating_actionBar.setOnClickListener {val c = Calendar.getInstance()val dialog: DatePickerDialog = DatePickerDialog(this, DatePickerDialog.OnDateSetListener { dataPicker, year, month, day ->y = yearm = monthd = day}, y, m, d)}}fun initView() {//设置rv中item的排列方式：竖排recycler_view.layoutManager = LinearLayoutManager(this)//设置下拉刷新的进度圆颜色和尺寸swipe_refresh_layout.setColorSchemeColors(resources.getColor(R.color.colorAccent))swipe_refresh_layout.setSize(SwipeRefreshLayout.DEFAULT)}override fun onCreateOptionsMenu(menu: Menu?): Boolean {this.menuInflater.inflate(R.menu.main, menu)return true}override fun onOptionsItemSelected(item: MenuItem?): Boolean {when (item!!.itemId) {R.id.action_about -> {val intent = Intent(this, AboutActiivty::class.java)startActivity(intent)}}return true}
}

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".news.UIActivity"><android.support.v4.widget.SwipeRefreshLayoutandroid:id="@+id/swipe_refresh_layout"android:layout_width="match_parent"android:layout_height="match_parent"><android.support.v7.widget.RecyclerViewandroid:id="@+id/recycler_view"android:layout_width="match_parent"android:layout_height="match_parent"></android.support.v7.widget.RecyclerView></android.support.v4.widget.SwipeRefreshLayout><android.support.design.widget.FloatingActionButtonandroid:id="@+id/floating_actionBar"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="bottom|right"android:layout_marginBottom="16dp"android:layout_marginRight="16dp"android:src="@mipmap/ic_launcher_round"app:layout_behavior="com.example.ktdemo.news.FabHideOnScroll" /></android.support.design.widget.CoordinatorLayout>

圆形头像类以及attrs.xml：

<?xml version="1.0" encoding="utf-8"?>
<resources><declare-styleable name="CircleImageView"><attr name="civ_border_width" format="dimension" /><attr name="civ_border_color" format="color" /><attr name="civ_border_overlay" format="boolean" /><attr name="civ_fill_color" format="color" /></declare-styleable>
</resources>

package com.example.ktdemo.news;import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.support.annotation.ColorInt;
import android.support.annotation.ColorRes;
import android.support.annotation.DrawableRes;
import android.util.AttributeSet;
import android.widget.ImageView;import com.example.ktdemo.R;/*** Created by lizhaotailang on 2016/7/6.*/public class CircleImageView extends ImageView {private static final ScaleType SCALE_TYPE = ScaleType.CENTER_CROP;private static final Bitmap.Config BITMAP_CONFIG = Bitmap.Config.ARGB_8888;private static final int COLORDRAWABLE_DIMENSION = 2;private static final int DEFAULT_BORDER_WIDTH = 0;private static final int DEFAULT_BORDER_COLOR = Color.BLACK;private static final int DEFAULT_FILL_COLOR = Color.TRANSPARENT;private static final boolean DEFAULT_BORDER_OVERLAY = false;private final RectF mDrawableRect = new RectF();private final RectF mBorderRect = new RectF();private final Matrix mShaderMatrix = new Matrix();private final Paint mBitmapPaint = new Paint();private final Paint mBorderPaint = new Paint();private final Paint mFillPaint = new Paint();private int mBorderColor = DEFAULT_BORDER_COLOR;private int mBorderWidth = DEFAULT_BORDER_WIDTH;private int mFillColor = DEFAULT_FILL_COLOR;private Bitmap mBitmap;private BitmapShader mBitmapShader;private int mBitmapWidth;private int mBitmapHeight;private float mDrawableRadius;private float mBorderRadius;private ColorFilter mColorFilter;private boolean mReady;private boolean mSetupPending;private boolean mBorderOverlay;private boolean mDisableCircularTransformation;public CircleImageView(Context context) {super(context);init();}public CircleImageView(Context context, AttributeSet attrs) {this(context, attrs, 0);}public CircleImageView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CircleImageView, defStyle, 0);mBorderWidth = a.getDimensionPixelSize(R.styleable.CircleImageView_civ_border_width, DEFAULT_BORDER_WIDTH);mBorderColor = a.getColor(R.styleable.CircleImageView_civ_border_color, DEFAULT_BORDER_COLOR);mBorderOverlay = a.getBoolean(R.styleable.CircleImageView_civ_border_overlay, DEFAULT_BORDER_OVERLAY);mFillColor = a.getColor(R.styleable.CircleImageView_civ_fill_color, DEFAULT_FILL_COLOR);a.recycle();init();}private void init() {super.setScaleType(SCALE_TYPE);mReady = true;if (mSetupPending) {setup();mSetupPending = false;}}@Overridepublic ScaleType getScaleType() {return SCALE_TYPE;}@Overridepublic void setScaleType(ScaleType scaleType) {if (scaleType != SCALE_TYPE) {throw new IllegalArgumentException(String.format("ScaleType %s not supported.", scaleType));}}@Overridepublic void setAdjustViewBounds(boolean adjustViewBounds) {if (adjustViewBounds) {throw new IllegalArgumentException("adjustViewBounds not supported.");}}@Overrideprotected void onDraw(Canvas canvas) {if (mDisableCircularTransformation) {super.onDraw(canvas);return;}if (mBitmap == null) {return;}if (mFillColor != Color.TRANSPARENT) {canvas.drawCircle(mDrawableRect.centerX(), mDrawableRect.centerY(), mDrawableRadius, mFillPaint);}canvas.drawCircle(mDrawableRect.centerX(), mDrawableRect.centerY(), mDrawableRadius, mBitmapPaint);if (mBorderWidth != 0) {canvas.drawCircle(mBorderRect.centerX(), mBorderRect.centerY(), mBorderRadius, mBorderPaint);}}@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh);setup();}public int getBorderColor() {return mBorderColor;}public void setBorderColor(@ColorInt int borderColor) {if (borderColor == mBorderColor) {return;}mBorderColor = borderColor;mBorderPaint.setColor(mBorderColor);invalidate();}public void setBorderColorResource(@ColorRes int borderColorRes) {setBorderColor(getContext().getResources().getColor(borderColorRes));}public int getFillColor() {return mFillColor;}public void setFillColor(@ColorInt int fillColor) {if (fillColor == mFillColor) {return;}mFillColor = fillColor;mFillPaint.setColor(fillColor);invalidate();}public void setFillColorResource(@ColorRes int fillColorRes) {setFillColor(getContext().getResources().getColor(fillColorRes));}public int getBorderWidth() {return mBorderWidth;}public void setBorderWidth(int borderWidth) {if (borderWidth == mBorderWidth) {return;}mBorderWidth = borderWidth;setup();}public boolean isBorderOverlay() {return mBorderOverlay;}public void setBorderOverlay(boolean borderOverlay) {if (borderOverlay == mBorderOverlay) {return;}mBorderOverlay = borderOverlay;setup();}public boolean isDisableCircularTransformation() {return mDisableCircularTransformation;}public void setDisableCircularTransformation(boolean disableCircularTransformation) {if (mDisableCircularTransformation == disableCircularTransformation) {return;}mDisableCircularTransformation = disableCircularTransformation;initializeBitmap();}@Overridepublic void setImageBitmap(Bitmap bm) {super.setImageBitmap(bm);initializeBitmap();}@Overridepublic void setImageDrawable(Drawable drawable) {super.setImageDrawable(drawable);initializeBitmap();}@Overridepublic void setImageResource(@DrawableRes int resId) {super.setImageResource(resId);initializeBitmap();}@Overridepublic void setImageURI(Uri uri) {super.setImageURI(uri);initializeBitmap();}@Overridepublic void setColorFilter(ColorFilter cf) {if (cf == mColorFilter) {return;}mColorFilter = cf;applyColorFilter();invalidate();}@Overridepublic ColorFilter getColorFilter() {return mColorFilter;}private void applyColorFilter() {if (mBitmapPaint != null) {mBitmapPaint.setColorFilter(mColorFilter);}}private Bitmap getBitmapFromDrawable(Drawable drawable) {if (drawable == null) {return null;}if (drawable instanceof BitmapDrawable) {return ((BitmapDrawable) drawable).getBitmap();}try {Bitmap bitmap;if (drawable instanceof ColorDrawable) {bitmap = Bitmap.createBitmap(COLORDRAWABLE_DIMENSION, COLORDRAWABLE_DIMENSION, BITMAP_CONFIG);} else {bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), BITMAP_CONFIG);}Canvas canvas = new Canvas(bitmap);drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());drawable.draw(canvas);return bitmap;} catch (Exception e) {e.printStackTrace();return null;}}private void initializeBitmap() {if (mDisableCircularTransformation) {mBitmap = null;} else {mBitmap = getBitmapFromDrawable(getDrawable());}setup();}private void setup() {if (!mReady) {mSetupPending = true;return;}if (getWidth() == 0 && getHeight() == 0) {return;}if (mBitmap == null) {invalidate();return;}mBitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);mBitmapPaint.setAntiAlias(true);mBitmapPaint.setShader(mBitmapShader);mBorderPaint.setStyle(Paint.Style.STROKE);mBorderPaint.setAntiAlias(true);mBorderPaint.setColor(mBorderColor);mBorderPaint.setStrokeWidth(mBorderWidth);mFillPaint.setStyle(Paint.Style.FILL);mFillPaint.setAntiAlias(true);mFillPaint.setColor(mFillColor);mBitmapHeight = mBitmap.getHeight();mBitmapWidth = mBitmap.getWidth();mBorderRect.set(calculateBounds());mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2.0f, (mBorderRect.width() - mBorderWidth) / 2.0f);mDrawableRect.set(mBorderRect);if (!mBorderOverlay) {mDrawableRect.inset(mBorderWidth, mBorderWidth);}mDrawableRadius = Math.min(mDrawableRect.height() / 2.0f, mDrawableRect.width() / 2.0f);applyColorFilter();updateShaderMatrix();invalidate();}private RectF calculateBounds() {int availableWidth  = getWidth() - getPaddingLeft() - getPaddingRight();int availableHeight = getHeight() - getPaddingTop() - getPaddingBottom();int sideLength = Math.min(availableWidth, availableHeight);float left = getPaddingLeft() + (availableWidth - sideLength) / 2f;float top = getPaddingTop() + (availableHeight - sideLength) / 2f;return new RectF(left, top, left + sideLength, top + sideLength);}private void updateShaderMatrix() {float scale;float dx = 0;float dy = 0;mShaderMatrix.set(null);if (mBitmapWidth * mDrawableRect.height() > mDrawableRect.width() * mBitmapHeight) {scale = mDrawableRect.height() / (float) mBitmapHeight;dx = (mDrawableRect.width() - mBitmapWidth * scale) * 0.5f;} else {scale = mDrawableRect.width() / (float) mBitmapWidth;dy = (mDrawableRect.height() - mBitmapHeight * scale) * 0.5f;}mShaderMatrix.setScale(scale, scale);mShaderMatrix.postTranslate((int) (dx + 0.5f) + mDrawableRect.left, (int) (dy + 0.5f) + mDrawableRect.top);mBitmapShader.setLocalMatrix(mShaderMatrix);}}

okhttp3.0封装类

package com.example.ktdemo.newsimport okhttp3.*/*** @author qzx* @time 2018/9/25 19:03*/
object HttpUtilsForKotlin {/*** GET方式请求HTTP* */fun getokHttpAsync(okHttpClient: OkHttpClient, url: String, callback: Callback) {//首先获取请求对象Requestval request: Request = Request.Builder().url(url).build()//然后获取到Call对象val call: Call = okHttpClient.newCall(request)//使用异步的入队方式（execute是同步）call.enqueue(callback)}/*** POST方式请求HTTP* </br>* 使用一个Map传递post参数* */fun postokHttpAsync(okHttpClient: OkHttpClient, url: String, paraMap: Map<String, String>, callback: Callback) {val builder: FormBody.Builder = FormBody.Builder()val iterator = paraMap.entries.iterator()while (iterator.hasNext()) {val entry = iterator.next()builder.add(entry.key, entry.value)}val requestBody: RequestBody = builder.build()val request = Request.Builder().url(url).post(requestBody).build()val call = okHttpClient.newCall(request)call.enqueue(callback)}}

Kotlin数据bean类：

package com.example.ktdemo.news/*** @author qzx* @time 2018/9/26 16:53*/
class KotlinBeanGson(val shift:String,val shift_cn:String,val date:String,val msgs:List<Message>){inner class Message(val realname:String,val avatar:String,val msg:String,val time:String){override fun toString(): String {return "Message(realname='$realname', avatar='$avatar', msg='$msg', time='$time')"}}override fun toString(): String {return "KotlinBeanGson(shift='$shift', shift_cn='$shift_cn', date='$date', msgs=$msgs)"}
}//-------------------------------------------------------package com.example.ktdemo.news/*** @author qzx* @time 2018/9/18 17:59** (val avatarUrl: String, val author: String, val content: String, val time: String, val imgUrl: String)*/
data class FanfouPost(var avatarUrl: String, var author: String, var content: String,var time: String, var imgUrl: String)
/*
class FanfouPost {var avatarUrl: String? = nullvar author: String? = nullvar content: String? = nullvar time: String? = nullvar imgUrl: String? = nullconstructor(avatarUrl: String, author: String, content: String?, time: String, imgUrl: String) {this.avatarUrl = avatarUrlthis.author = authorthis.content = contentthis.time = timethis.imgUrl = imgUrl}
}*/

给RecyclerView的Adapter类和XML:

package com.example.ktdemo.newsimport android.content.Context
import android.support.v7.widget.RecyclerView
import android.text.Html
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroupimport com.example.ktdemo.R
import com.squareup.picasso.Picasso
import kotlinx.android.synthetic.main.fanfou_item_layout.view.*/*** @author qzx* @time 2018/9/26 14:36*/
class RVAdapter(val context: Context, val list: List<FanfouPost>) :RecyclerView.Adapter<RVAdapter.FanfouPostsViewHolder>() {private var listener: OnRecyclerViewOnClickListener? = nullfun setOnItemClickListener(listener: OnRecyclerViewOnClickListener) {this.listener = listener}init {//可用于初始化使用主构造器中的参数}override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): FanfouPostsViewHolder {val view = LayoutInflater.from(context).inflate(R.layout.fanfou_item_layout, parent, false)return FanfouPostsViewHolder(view, listener!!)}override fun getItemCount(): Int {return list.size}override fun onBindViewHolder(holder: FanfouPostsViewHolder, position: Int) {val item = list[position]Picasso.get().load(item.avatarUrl).placeholder(R.mipmap.ic_launcher).error(R.mipmap.ic_launcher).into(holder.itemView.avatar)if (item.imgUrl.isNullOrEmpty()) {holder.itemView.iv_main.visibility = View.INVISIBLE} else {holder.itemView.iv_main.visibility = View.VISIBLE}holder.itemView.tv_author.text = item.authorholder.itemView.tv_content.text = Html.fromHtml(item.content).toString()holder.itemView.tv_time.text = item.time}inner class FanfouPostsViewHolder(itemView: View, listener: OnRecyclerViewOnClickListener): RecyclerView.ViewHolder(itemView), View.OnClickListener {//internal模块类使用有效private val listener: OnRecyclerViewOnClickListener = listenerinit {itemView.setOnClickListener(this)}override fun onClick(v: View?) {listener.onItemClick(v!!, layoutPosition)}}
}

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginTop="4dp"><LinearLayoutandroid:orientation="horizontal"android:layout_width="match_parent"android:layout_height="match_parent"android:paddingTop="16dp"android:paddingBottom="16dp"android:paddingRight="16dp"android:paddingLeft="16dp"><com.example.ktdemo.news.CircleImageViewandroid:layout_width="60dp"android:layout_height="60dp"android:id="@+id/avatar"android:layout_marginRight="16dp"/><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/tv_author"android:textSize="16sp"android:textStyle="bold"android:gravity="center_vertical"android:layout_marginTop="8dp" /><ImageViewandroid:layout_width="24dp"android:layout_height="24dp"android:id="@+id/iv_main"android:src="@mipmap/ic_launcher_round"android:layout_alignParentRight="true"/></RelativeLayout><TextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:id="@+id/tv_content"android:layout_marginTop="8dp" /><TextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:id="@+id/tv_time"android:layout_marginTop="8dp"android:gravity="start" /></LinearLayout></LinearLayout></android.support.v7.widget.CardView>

最后即接口类和FloatingActionButton简单重写的Behavior:

package com.example.ktdemo.news;import android.content.Context;
import android.support.design.widget.CoordinatorLayout;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.view.ViewCompat;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.LinearInterpolator;/*** @author qzx* @time 2018/9/18 17:54*/
public class FabHideOnScroll extends FloatingActionButton.Behavior {public FabHideOnScroll(Context context, AttributeSet attr){super();}@Overridepublic void onNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionButton child, View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed);// child -> Floating Action Buttonif (dyConsumed > 0){CoordinatorLayout.LayoutParams layoutParams = (CoordinatorLayout.LayoutParams) child.getLayoutParams();int fabBottomMargin = layoutParams.bottomMargin;child.animate().translationY(child.getHeight() + fabBottomMargin).setInterpolator(new LinearInterpolator()).start();} else if (dyConsumed < 0){child.animate().translationY(0).setInterpolator(new LinearInterpolator()).start();}}@Overridepublic boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionButton child, View directTargetChild, View target, int nestedScrollAxes) {return nestedScrollAxes == ViewCompat.SCROLL_AXIS_VERTICAL;}}

package com.example.ktdemo.newsimport android.view.View/*** @author qzx* @time 2018/9/18 17:57*/
interface OnRecyclerViewOnClickListener {fun onItemClick(view: View, position: Int)
}

这次简单的学习使用Kotlin完结，感觉Kotlin还是很好用的，多联系以下就会顺手些。

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Kotlin学习的简易练手

参考饭否的项目练手的：Kotlin饭否

Kotlin学习的简易练手

一、AndroidStudio的gradle配置（重点部分都有双斜杠注释）

1、Module的gradle配置(重点是引入Kotlin以及Kotlin-extention)

2、Project的gradle配置

二、具体的相关代码

主Activity以及XML

圆形头像类以及attrs.xml：

okhttp3.0封装类

Kotlin数据bean类：

给RecyclerView的Adapter类和XML:

最后即接口类和FloatingActionButton简单重写的Behavior:

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