Kotlin开发Android应用实例详解

apply plugin: 'com.android.application'
apply plugin:'kotlin-android'
apply plugin:'kotlin-android-extensions'

dependencies {
 classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.1.1'
}

compile 'org.jetbrains.kotlin:kotlin-stdlib:1.1.1'
compile 'org.jetbrains.anko:anko-sdk25:0.10.0-beta-1'// sdk15, sdk19, sdk21, sdk23 are also available
compile 'org.jetbrains.anko:anko-appcompat-v7:0.10.0-beta-1'

Anko Commons: a lightweight library full of helpers for intents, dialogs, logging and so on;
Anko Layouts: a fast and type-safe way to write dynamic Android layouts;
Anko SQLite: a query DSL and parser collection for Android SQLite;
Anko Coroutines: utilities based on the kotlinx.coroutines library

TextView username;
username=(TextView)findViewById(R.id.user);

username.setText("我是一个TextView");

@BindView(R.id.user)
TextView username;

username.setText("我是一个TextView");

user.text="我是一个TextView"

//activity_login就是我们的布局
import kotlinx.android.synthetic.main.activity_login.*

verticalLayout {
   val textView=textView("我是一个TextView")
   val name = editText("EditText")
   button("Button") {
    onClick { toast("${name.text}!") }
   }
  }

val textView=textView("我是一个TextView"){
    textSize = sp(17).toFloat()
    textColor=context.resources.getColor(R.color.red)
   }.lparams{
    margin=dip(10)
    height= dip(40)
    width= matchParent
   }

inner class UI : AnkoComponent {
  override fun createView(ui: AnkoContext): View {
   return with(ui){
    verticalLayout {
     val textView=textView("我是一个TextView"){
      textSize = sp(17).toFloat()
      textColor=context.resources.getColor(R.color.red)
     }.lparams{
      margin=dip(10)
      height= dip(40)
      width= matchParent
     }
     val name = editText("EditText")
     button("Button") {
      onClick { view ->
       toast("Hello, ${name.text}!")
      }
     }
    }
   }
  }
 }

UI().setContentView(this@LoginActivity)

inline fun View.dip(value: Int): Int = context.dip(value)
fun Context.dip(value: Int): Int = (value * resources.displayMetrics.density).toInt()

inline fun AnkoContext<*>.toast(message: CharSequence) = ctx.toast(message)
fun Context.toast(message: CharSequence) = Toast.makeText(this, message, Toast.LENGTH_SHORT).show()

  alert ("我是Dialog"){
      yesButton { toast("yes")}
      noButton { toast("no")}
     }.show()

 doAsync {
   //后台执行代码
   uiThread { 
   //UI线程
   toast("线程${Thread.currentThread().name}") }
  }

 lateinit var et_account: EditText
 lateinit var et_password: EditText
 inner class LoginUi : AnkoComponent {
  override fun createView(ui: AnkoContext) = with(ui) {
   verticalLayout {
    backgroundColor = context.resources.getColor(android.R.color.white)
    gravity = Gravity.CENTER_HORIZONTAL
    imageView(R.mipmap.ic_launcher).lparams {
     width = dip(100)
     height = dip(100)
     topMargin = dip(64)
    }

    linearLayout {
     gravity = Gravity.CENTER_VERTICAL
     orientation = HORIZONTAL
     backgroundResource = R.drawable.bg_frame_corner
     imageView {
      image = resources.getDrawable(R.mipmap.ic_username)
     }.lparams(width = wrapContent, height = wrapContent) {
      leftMargin = dip(12)
      rightMargin = dip(15)
     }
     et_account = editText {
      hint = "登录账户"
      hintTextColor = Color.parseColor("#666666")
      textSize = 16f
      background = null
     }
    }.lparams(width = dip(300), height = dip(40)) {
     topMargin = dip(45)
    }

    linearLayout {
     orientation = HORIZONTAL
     backgroundResource = R.drawable.bg_frame_corner
     gravity = Gravity.CENTER_VERTICAL
     imageView {
      image = resources.getDrawable(R.mipmap.ic_password)
     }.lparams {
      leftMargin = dip(12)
      rightMargin = dip(15)
     }
     et_password = editText {
      hint = "登录密码"
      hintTextColor = Color.parseColor("#666666")
      textSize = 16f
      background = null
     }
    }.lparams {
     width = dip(300)
     height = dip(40)
     topMargin = dip(10)

    }

    button("登录") {
     gravity = Gravity.CENTER
     background = resources.getDrawable(R.drawable.bg_login_btn)
     textColor = Color.parseColor("#ffffff")
     onClick {
      if (et_account.text.toString().isNotEmpty() && et_password.text.toString().isNotEmpty())
       startActivity() else toast("请输入账户或者密码")
     }
    }.lparams(width = dip(300), height = dip(44)) {
     topMargin = dip(18)
    }
    linearLayout {
     orientation = HORIZONTAL
     gravity = Gravity.CENTER_VERTICAL
     checkBox("记住密码") {
      textColor = Color.parseColor("#666666")
      textSize = 16f
      leftPadding = dip(5)
     }
     textView("隐私协议") {
      textColor = Color.parseColor("#1783e3")
      gravity = Gravity.RIGHT
      textSize = 16f
     }.lparams(width = matchParent)
    }.lparams(width = dip(300)) {
     topMargin = dip(18)
    }

    textView("Copyright © Code4Android") {
     textSize = 14f
     gravity = Gravity.CENTER or Gravity.BOTTOM

    }.lparams {
     bottomMargin = dip(35)
     weight = 1f
    }
   }
  }
 }

startActivity("account" to et_account.text.toString(),"password" to et_password.text.toString())