写在开头

接触Kotlin有一段时间了,以前只是当作兴趣来看看,今天看到Google I/O大会,Kotlin作为Android官方开发语言,不免有一种突然转正的感觉,在这感谢入门领路人:微信号KotlinX
效果图

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1:环境配置

android studio加入Kotlin插件

1.png

2:打包依赖

2.jpg

3.jpg

3:开发

4.png

import android.content.Context
import android.graphics.Color
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.widget.EditText
import demo.kotlin.myapplication.Java.MainActivity
import demo.kotlin.myapplication.R
import org.jetbrains.anko.*

class Main2Activity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        //Anko加载布局方式
        Main2ActivityUI(this).setContentView(this)
    }

    class Main2ActivityUI(activity: Context) : AnkoComponent<Main2Activity> {
        var activity = activity
        override fun createView(ui: AnkoContext<Main2Activity>) = with(ui) {
            verticalLayout {
                padding = dip(30)
                var title = editText {
                    id = R.id.todo_title
                    hintResource = R.string.title_hint
                    textColor = Color.BLUE
                }

                var desc = editText {
                    id = R.id.todo_desc
                    hintResource = R.string.description_hint
                }
                button {
                    id = R.id.todo_add
                    textResource = R.string.add_todo
                    onClick { view -> createTodoFrom(activity, title, desc) }
                }
            }
        }

        /**
         * 点击事件,调用java的Activity并传递数据
         */
        private fun createTodoFrom(activity: Context, title: EditText, desc: EditText) {
            activity.startActivity<MainActivity>("title" to "账号:" + title.text.toString() + "--密码:" + desc.text.toString())
        }
    }
}

2.Java代码

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        String title = getIntent().getExtras().getString("title");
        TextView tv = (TextView) findViewById(R.id.tv);
        tv.setText(title);
    }
}
---------------------------------------------------------------------------------------------
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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="demo.kotlin.myapplication.Java.MainActivity">

    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>