[kotlin][Android] Activity 한번에 종료하기

이번 시간에는 activity를 여러개 쌓은 후, 마지막 것을 기준으로 한번에 종료하는 기능을 만들어보겠습니다.

해당 기능을 구현하는 방법은 여러가지가 있습니다. 

하지만 그것들 중에서 ActivityResultLauncher<Intent> 를 사용할 것 입니다.

원리는 간단합니다. launcher을 통해 activity를 실행시킨후, 던진 데이터가 finish이면 종료시킵니다.

이를 위해선 매 activity launcher가 필요하므로 BaseLauncherActivity를 만들어 상속해줍시다.

open class BaseLauncherActivity : AppCompatActivity() {

    protected lateinit var launcher: ActivityResultLauncher<Intent>

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        launcher =
            registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result: ActivityResult ->
                if (result.resultCode == RESULT_OK) {
                    val data = result.data
                    setResult(RESULT_OK, data)
                    finish()
                }
            }
    }
}

 

MainActivity

class MainActivity : AppCompatActivity() {

    private lateinit var launcher: ActivityResultLauncher<Intent>
    private lateinit var tv : TextView

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        tv = findViewById(R.id.result)

        findViewById<Button>(R.id.button2).setOnClickListener {
            val intent = Intent(baseContext, Signup1Activity::class.java)
            launcher.launch(intent)
        }

        launcher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result: ActivityResult ->
            if (result.resultCode == RESULT_OK) {
                val data = result.data

                tv.text = "id : ${data?.getStringExtra("id")}\npassword : ${data?.getStringExtra("id")}\n소개말 : ${data?.getStringExtra("description")}"
            }
        }
    }
}

 

class Signup1Activity : BaseLauncherActivity() {
    private lateinit var et : EditText

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.signup1_activity)
        et = findViewById(R.id.editText)


        findViewById<Button>(R.id.button).setOnClickListener {
            val intent = Intent(baseContext, Signup2Activity::class.java)
            intent.putExtra("id", et.text.toString())
            launcher.launch(intent)
        }
    }
}

class Signup2Activity : BaseLauncherActivity() {

    private lateinit var et : EditText
    private lateinit var id : String

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.signup2_activity)


        if (intent.hasExtra("id")) {
            id = intent.getStringExtra("id")!!
        } else {
            finish()
        }


        et = findViewById(R.id.editText)


        findViewById<Button>(R.id.button).setOnClickListener {
            val intent = Intent(baseContext, Signup3Activity::class.java)
            intent.putExtra("id", id)
            intent.putExtra("password", et.text.toString())
            launcher.launch(intent)
        }
    }
}

 

class Signup3Activity : BaseLauncherActivity() {

    private lateinit var et : EditText
    private lateinit var id : String
    private lateinit var password : String

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.signup3_activity)
        et = findViewById(R.id.editText)


        if (intent.hasExtra("id") && intent.hasExtra("password")) {
            id = intent.getStringExtra("id")!!
            password = intent.getStringExtra("password")!!
        } else {
            finish()
        }


        findViewById<Button>(R.id.button).setOnClickListener {
            val data = Intent()
            data.putExtra("id", id)
            data.putExtra("password", password)
            data.putExtra("description", et.text.toString())
            data.putExtra("finish", true)
            setResult(RESULT_OK, data)
            super.finish()
        }
    }
}

 

activity_main

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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=".MainActivity">

    <TextView
        android:id="@+id/result"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="가입해주세요."
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="44dp"
        android:text="가입"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/result" />


</androidx.constraintlayout.widget.ConstraintLayout>

 

signup1_activity.xml

<!-- signup1_activity -->
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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=".Signup1Activity">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="68dp"
        android:text="다음"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="30dp"
        android:layout_marginTop="60dp"
        android:text="아이디"
        app:layout_constraintEnd_toStartOf="@+id/editText"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/editText"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="20dp"
        android:layout_marginEnd="30dp"
        android:hint="아이디"
        app:layout_constraintBottom_toBottomOf="@+id/textView2"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toEndOf="@+id/textView2"
        app:layout_constraintTop_toTopOf="@+id/textView2" />

</androidx.constraintlayout.widget.ConstraintLayout>

 

signup2_activity

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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=".Signup1Activity">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="68dp"
        android:text="다음"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="30dp"
        android:layout_marginTop="60dp"
        android:text="비밀번호"
        app:layout_constraintEnd_toStartOf="@+id/editText"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/editText"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="20dp"
        android:layout_marginEnd="30dp"
        android:inputType="textPassword"
        android:hint="비밀번호"
        app:layout_constraintBottom_toBottomOf="@+id/textView2"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toEndOf="@+id/textView2"
        app:layout_constraintTop_toTopOf="@+id/textView2" />

</androidx.constraintlayout.widget.ConstraintLayout>

 

signup3_activity

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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=".Signup1Activity">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="68dp"
        android:text="완료"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="30dp"
        android:text="자기 소개"
        app:layout_constraintBottom_toBottomOf="@+id/editText"
        app:layout_constraintEnd_toStartOf="@+id/editText"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/editText" />

    <EditText
        android:id="@+id/editText"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="20dp"
        android:layout_marginTop="36dp"
        android:layout_marginEnd="30dp"
        android:hint="자기소개"
        android:inputType="text|textMultiLine"
        android:lines="20"
        android:scrollbars="vertical"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toEndOf="@+id/textView2"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

 

>> 결과물

결과물

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