佈局文件:activity_test_kt.xml
java
<?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="com.kotlin.test.TestActivityKt">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button1"/>
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button2"/>
</LinearLayout>
</android.support.constraint.ConstraintLayout>
複製代碼
相似java, findViewByIdandroid
lateinit var button1 : Button
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_test_kt)
supportActionBar?.setTitle("kt 測試")
button1 = findViewById(R.id.button1)
button1.setOnClickListener(){
Log.d(TAG, "button 1 press")
}
}
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結果: bash
app下的 build.gradle
中添加app
apply plugin: 'kotlin-android-extensions'
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基本上Android Studio 會默認添加ide
Activity中 import
佈局
import kotlinx.android.synthetic.main.activity_test_kt.*
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onCreate代碼測試
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_test_kt)
supportActionBar?.setTitle("kt 測試")
button2.setOnClickListener(){
Log.d(TAG, "button 2 press")
}
}
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能夠直接經過控件的id,直接使用對應控件gradle
結果ui