Kotlin 인텐트(intent) : 암시적 인텐트 (Implicit Intent)-기본 예제
** 전화걸기, 홈페이지 열기, 구글 앱 열기, 구글 검색하, 문자 보내기, 사진 찍기 *
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      activity_main.xml
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/btnDial"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="전화 걸기" />

    <Button
        android:id="@+id/btnWeb"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="홈 페이지 열기" />

    <Button
        android:id="@+id/btnGoogle"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="구글 맵 열기" />

    <Button
        android:id="@+id/btnSearch"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="구글 검색하기" />

    <Button
        android:id="@+id/btnSms"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="문자 보내기" />

    <Button
        android:id="@+id/btnPhoto"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="사진 찍기" />
</LinearLayout>

------------------------------------------------------------------------------------
    MainActivity.kt
------------------------------------------------------------------------------------
class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        title = "암시적 인텐트 예제"

        var btnDial = findViewById<Button>(R.id.btnDial)
        var btnWeb = findViewById<Button>(R.id.btnWeb)
        var btnGoogle = findViewById<Button>(R.id.btnGoogle)
        var btnSearch = findViewById<Button>(R.id.btnSearch)
        var btnSms = findViewById<Button>(R.id.btnSms)
        var btnPhoto = findViewById<Button>(R.id.btnPhoto)

        btnDial.setOnClickListener {
            var uri = Uri.parse("tel:010-1234-5678")
            var intent = Intent(Intent.ACTION_DIAL, uri)
            startActivity(intent)
        }

        btnWeb.setOnClickListener {
            var uri = Uri.parse("http://www.embeddedkorea.co.kr")
            var intent = Intent(Intent.ACTION_VIEW, uri)
            startActivity(intent)
        }

        btnGoogle.setOnClickListener {
            var uri = Uri.parse("https://maps.google.com/maps?q="
                    + 37.559133 + "," + 126.927824)
            var intent = Intent(Intent.ACTION_VIEW, uri)
            startActivity(intent)
        }

        btnSearch.setOnClickListener {
            var intent = Intent(Intent.ACTION_WEB_SEARCH)
            intent.putExtra(SearchManager.QUERY, "안드로이드")
            startActivity(intent)
        }

        btnSms.setOnClickListener {
            var intent = Intent(Intent.ACTION_SENDTO)
            intent.putExtra("sms_body", "안녕하세요?")
            intent.data = Uri.parse("smsto:" + Uri.encode("010-1234-4567"))
            startActivity(intent)
        }

        btnPhoto.setOnClickListener {
            var intent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
            startActivity(intent)
        }
    }

}

------------------------------------------------------------------------------------
    AndroidManifest.xml
------------------------------------------------------------------------------------
*** 추가 하기 *****
    <uses-feature
        android:name="android.hardware.telephony"
        android:required="false" />

    <uses-permission android:name="android.permission.CALL_PHONE" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <uses-permission android:name="android.permission.INTERNET"/>

_________________________________________________________________
    themes.xml
------------------------------------------------------------------------------------
<resources xmlns:tools="http://schemas.android.com/tools">
    <!-- Base application theme. -->
    <style name="Base.Theme.ImplicitIntentExem" parent="Theme.AppCompat.Light">
        <item name="colorPrimary">#2196F3</item>
        <item name="colorPrimaryDark">#3F51B5</item>
    </style>

    <style name="Theme.ImplicitIntentExem" parent="Base.Theme.ImplicitIntentExem" />
</resources>