Kotlin: การเรียกใช้งานแอคทิวิตี้อื่น และส่งข้อมูลกลับมา

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal">

        <EditText
            android:id="@+id/editText"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:hint="Text Me" />

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="sendMessage"
            android:text="Send" />
    </LinearLayout>

</LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

tools:context=".MainActivity">

<LinearLayout

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="horizontal">

<EditText

android:id="@+id/editText"

android:layout_width="0dp"

android:layout_height="wrap_content"

android:layout_weight="1"

android:hint="Text Me" />

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:onClick="sendMessage"

android:text="Send" />

</LinearLayout>

MainActivity.kt

package com.phaisarn.myapplication

import android.app.Activity
import android.content.Intent
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.EditText
import android.widget.Toast

const val EXTRA_MESSAGE1 = "com.phaisarn.myapplication.MESSAGE1"
const val EXTRA_MESSAGE2 = "com.phaisarn.myapplication.MESSAGE2"
const val CODE = 1

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }

    /** Called when the user taps the Send button */
    fun sendMessage(view: View) {
        val editText = findViewById<EditText>(R.id.editText)
        val message = editText.text.toString()
        val intent = Intent(this, SecondActivity::class.java).apply {
            putExtra(EXTRA_MESSAGE1, message)
        }
        startActivityForResult(intent, CODE)
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, intent: Intent) {
        if (requestCode == CODE) {
            if (resultCode == Activity.RESULT_OK) {
                val msg = intent.getStringExtra(EXTRA_MESSAGE2)
                Toast.makeText(this, msg, Toast.LENGTH_SHORT).show()
            }
        }
    }
}

package com.phaisarn.myapplication

import android.app.Activity

import android.content.Intent

import android.support.v7.app.AppCompatActivity

import android.os.Bundle

import android.view.View

import android.widget.EditText

import android.widget.Toast

const val EXTRA_MESSAGE1 = "com.phaisarn.myapplication.MESSAGE1"

const val EXTRA_MESSAGE2 = "com.phaisarn.myapplication.MESSAGE2"

const val CODE = 1

class MainActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {

super.onCreate(savedInstanceState)

setContentView(R.layout.activity_main)

}

/** Called when the user taps the Send button */

fun sendMessage(view: View) {

val editText = findViewById<EditText>(R.id.editText)

val message = editText.text.toString()

val intent = Intent(this, SecondActivity::class.java).apply {

putExtra(EXTRA_MESSAGE1, message)

}

startActivityForResult(intent, CODE)

}

override fun onActivityResult(requestCode: Int, resultCode: Int, intent: Intent) {

if (requestCode == CODE) {

if (resultCode == Activity.RESULT_OK) {

val msg = intent.getStringExtra(EXTRA_MESSAGE2)

Toast.makeText(this, msg, Toast.LENGTH_SHORT).show()

}

activity_second.xml

<?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="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    tools:context=".SecondActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="18sp" />

    <EditText
        android:id="@+id/editText"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="onClick"
        android:text="Return main Activity" />

</LinearLayout>

<?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="match_parent"

android:layout_height="match_parent"

android:orientation="horizontal"

tools:context=".SecondActivity">

<TextView

android:id="@+id/textView"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textSize="18sp" />

<EditText

android:id="@+id/editText"

android:layout_width="0dp"

android:layout_height="wrap_content"

android:layout_weight="1" />

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:onClick="onClick"

android:text="Return main Activity" />

</LinearLayout>

SecondActivity.kt

package com.phaisarn.myapplication

import android.app.Activity
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.widget.TextView
import android.content.Intent
import android.view.View
import android.widget.EditText



class SecondActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_second)

        // Get the Intent that started this activity and extract the string
        val message = intent.getStringExtra(EXTRA_MESSAGE1)

        // Capture the layout's TextView and set the string as its text
        val textView = findViewById<TextView>(R.id.textView).apply {
            text = message
        }
    }

    fun onClick(view: View) {
        val editText = findViewById<EditText>(R.id.editText)
        val msg = editText.text.toString()
        val intent = Intent()
        intent.putExtra(EXTRA_MESSAGE2, msg)
        setResult(Activity.RESULT_OK, intent)
        finish()
    }
}

package com.phaisarn.myapplication

import android.app.Activity

import android.support.v7.app.AppCompatActivity

import android.os.Bundle

import android.widget.TextView

import android.content.Intent

import android.view.View

import android.widget.EditText

class SecondActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {

super.onCreate(savedInstanceState)

setContentView(R.layout.activity_second)

// Get the Intent that started this activity and extract the string

val message = intent.getStringExtra(EXTRA_MESSAGE1)

// Capture the layout's TextView and set the string as its text

val textView = findViewById<TextView>(R.id.textView).apply {

text = message

}

fun onClick(view: View) {

val editText = findViewById<EditText>(R.id.editText)

val msg = editText.text.toString()

val intent = Intent()

intent.putExtra(EXTRA_MESSAGE2, msg)

setResult(Activity.RESULT_OK, intent)

finish()

}

บรรทัดที่ 34 : ปิด activity นี้ ด้วย finish()

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.phaisarn.myapplication">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".SecondActivity"
            android:parentActivityName=".MainActivity"></activity>
    </application>

</manifest>

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.phaisarn.myapplication">

<application

android:allowBackup="true"

android:icon="@mipmap/ic_launcher"

android:label="@string/app_name"

android:roundIcon="@mipmap/ic_launcher_round"

android:supportsRtl="true"

android:theme="@style/AppTheme">

<intent-filter>

</intent-filter>

</activity>

<activity

android:name=".SecondActivity"

android:parentActivityName=".MainActivity"></activity>

</application>

</manifest>

Phaisarn Sutheebanjard

blog.phaisarn.com

Kotlin: การเรียกใช้งานแอคทิวิตี้อื่น และส่งข้อมูลกลับมา