[Android] アプリの画面遷移とActivity間のデータ転送

ページをめくるようにアプリ画面全体を変えたり、設定画面、HELPに画面遷移させたいケースは多々あります。

　
またその時に何らかのデータも同時に転送して、場合によっては遷移先からデータを取得して戻りたい場合の実装方法について考えてみます。

Android Studio
2024.1.1

Activity 画面を遷移しデータを受け渡すアプリ

画面の遷移だけのケースはActivityの画面遷移にて説明しましたが

遷移したタイミングでデータを渡したい
遷移先から戻るタイミングでデータを受け取りたい

という場合にはIntentを使ってActivity間でデータを渡すことができます。

以前は、startActivityForResult(Intent, int)やonActivityResult(int, int, Intent)
これらを使っていましたが registerForActivityResult() を使うことが推奨されています。
アクティビティの結果を取得する
　

目次
1. MainActivity ：putExtra & registerForActivityResult
2. SubActivity ：データを受け取る
3. SubActivity ：[back] ボタンのタップで元に戻り、データを返す
4. MainActivity ：元の画面でデータを受け取る
5. サンプルコード

putExtra & registerForActivityResult()

MainActivity から SubActivity への遷移は

Intent intent = new Intent(getApplication(), SubActivity.class);
startActivity(intent);

1 2	Intent intent = new Intent(getApplication(), SubActivity.class); startActivity(intent);

でしたが、ここでデータを渡すために
putExtra(name, value)　を追加します
渡すデータの key(name) と value を putExtra に入れます
入れるデータの型指定はありません

Intent intent = new Intent(getApplication(), SubActivity.class);
intent.putExtra("EXTRA_DATA", data1);
startActivity(intent);

Intent intent = new Intent(getApplication(), SubActivity.class);

intent.putExtra("EXTRA_DATA", data1);

startActivity(intent);

　
Googleのドキュメント、別の Activity を開始するではpublicなKeyを設定しています。これはputExtraのReferenceによると
String: The name of the extra data, with package prefix.
とありますので、package名（この例では testactuvitytransdata）をprefixとして例えば、EXTRA_DATAというのを設定します。
　

public static final String EXTRA_DATA
            = "com.example.testactivitytransdata.DATA";
...
Intent intent = new Intent(getApplication(), SubActivity.class);
intent.putExtra(EXTRA_DATA, data1);
startActivity(intent);

public static final String EXTRA_DATA

= "com.example.testactivitytransdata.DATA";

...

Intent intent = new Intent(getApplication(), SubActivity.class);

intent.putExtra(EXTRA_DATA, data1);

startActivity(intent);

　
data1 を渡すだけならこれでいいのですが、SubActivity からの返しを受け取りたい場合は
registerForActivityResult() を使います。

ActivityResultLauncher<Intent> resultLauncher = registerForActivityResult(
	new ActivityResultContracts.StartActivityForResult(),
	new ActivityResultCallback<ActivityResult>() {
	    @Override
	    public void onActivityResult(ActivityResult result) {
	        if (result.getResultCode() == Activity.RESULT_OK) {
	            ...
	        }
	    }
});

ActivityResultLauncher<Intent> resultLauncher = registerForActivityResult(

new ActivityResultContracts.StartActivityForResult(),

new ActivityResultCallback<ActivityResult>() {

@Override

public void onActivityResult(ActivityResult result) {

if (result.getResultCode() == Activity.RESULT_OK) {

...

}

});

Intent intent = new Intent(getApplication(), SubActivity.class);
intent.putExtra(EXTRA_DATA, data1);

resultLauncher.launch(intent);

Intent intent = new Intent(getApplication(), SubActivity.class);

intent.putExtra(EXTRA_DATA, data1);

resultLauncher.launch(intent);

registerForActivityResult() は、

ActivityResultContract と
ActivityResultCallback を受け取り

他のアクティビティを開始するために使用する

ActivityResultLauncher を返します。

SubActivity データを受け取る

渡されたデータを受け取るには

Intent intent = getIntent();
data1 = intent.getIntExtra(MainActivity.EXTRA_DATA, 0);

1 2	Intent intent = getIntent(); data1 = intent.getIntExtra(MainActivity.EXTRA_DATA, 0);

　
受け取るときは、name とデータの型を指定します。
データが int の場合は、初期値を入れます
intent.getIntExtra(name, defaultValue)

その他、
getStringExtra(String name)
getBooleanExtra(String name, boolean defaultValue)
…etc.
Intent reference

[back] ボタンタップで元に戻り、データを返す

SubActivity から戻るときにデータを返すには同様に
putExtra(name, value)
を使います
　

Intent intent = new Intent();
intent.putExtra(MainActivity.EXTRA_DATA, result);
setResult(RESULT_OK, intent);

Intent intent = new Intent();

intent.putExtra(MainActivity.EXTRA_DATA, result);

setResult(RESULT_OK, intent);

元の画面でデータを受け取る

SubActivity から ActivityResultLauncher でデータを受け取り、
RESULT_OKであるか判定してデータを受け取ります。

ActivityResultLauncher<Intent> resultLauncher = registerForActivityResult(
	new ActivityResultContracts.StartActivityForResult(),
	new ActivityResultCallback() {
	    @Override
	    public void onActivityResult(ActivityResult result) {
	        if (result.getResultCode() == Activity.RESULT_OK) {
	            ...
	        }
	    }
});

ActivityResultLauncher<Intent> resultLauncher = registerForActivityResult(

new ActivityResultContracts.StartActivityForResult(),

new ActivityResultCallback() {

@Override

public void onActivityResult(ActivityResult result) {

if (result.getResultCode() == Activity.RESULT_OK) {

...

}

});

サンプルコード

色々追加して、以下のような機能でまとめてみます。
MainActivityで文字入力
SubActivityで受け取って表示
SubActivityから、受け取った文字列に追加して戻す
MainActivityではSubActivityから戻された文字列を表示
尚、Key nameはEXTRA_MESSAGEとして設定しました
　
MainActivity.java

//package com.example.testactivitytransdata;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import androidx.activity.EdgeToEdge;
import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

public class MainActivity extends AppCompatActivity {

    private EditText editText;
    private String message;
    private TextView textView;

    // the key constant
    public static final String EXTRA_MESSAGE
            // YourPackageName.MESSAGE
             = "com.example.testactivitytransdata.MESSAGE";


    ActivityResultLauncher<Intent> resultLauncher = registerForActivityResult(
            new ActivityResultContracts.StartActivityForResult(),
            result -> {
                //new ActivityResultCallback() {
                //    @Override
                //    public void onActivityResult(ActivityResult result) {
                if (result.getResultCode() == Activity.RESULT_OK) {
                    Intent intent = result.getData();
                    if (intent != null) {
                        String res = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
                        textView.setText(res);
                    }
                }
                // }
            });

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
            return insets;
        });

        textView = findViewById(R.id.text_view);

        final EditText editText= findViewById(R.id.edit_text);

        Button button = findViewById(R.id.send_button);
        button.setOnClickListener( v -> {
            Intent intent = new Intent(getApplication(), SubActivity.class);
            if(editText.getText() != null){
                String str = editText.getText().toString();
                intent.putExtra(EXTRA_MESSAGE, str);
            }
            resultLauncher.launch(intent);

            // in order to clear the edittext
            editText.setText("");
        });
    }
}

//package com.example.testactivitytransdata;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

import androidx.activity.EdgeToEdge;

import androidx.activity.result.ActivityResultLauncher;

import androidx.activity.result.contract.ActivityResultContracts;

import androidx.appcompat.app.AppCompatActivity;

import androidx.core.graphics.Insets;

import androidx.core.view.ViewCompat;

import androidx.core.view.WindowInsetsCompat;

public class MainActivity extends AppCompatActivity {

private EditText editText;

private String message;

private TextView textView;

// the key constant

public static final String EXTRA_MESSAGE

// YourPackageName.MESSAGE

= "com.example.testactivitytransdata.MESSAGE";

ActivityResultLauncher<Intent> resultLauncher = registerForActivityResult(

new ActivityResultContracts.StartActivityForResult(),

result -> {

//new ActivityResultCallback() {

// @Override

// public void onActivityResult(ActivityResult result) {

if (result.getResultCode() == Activity.RESULT_OK) {

Intent intent = result.getData();

if (intent != null) {

String res = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);

textView.setText(res);

}

// }

});

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

EdgeToEdge.enable(this);

setContentView(R.layout.activity_main);

ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {

Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());

v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);

return insets;

});

textView = findViewById(R.id.text_view);

final EditText editText= findViewById(R.id.edit_text);

Button button = findViewById(R.id.send_button);

button.setOnClickListener( v -> {

Intent intent = new Intent(getApplication(), SubActivity.class);

if(editText.getText() != null){

String str = editText.getText().toString();

intent.putExtra(EXTRA_MESSAGE, str);

}

resultLauncher.launch(intent);

// in order to clear the edittext

editText.setText("");

});

}

　
遷移先のActivity
SubActivity.javaを作成します。
　

　
SubActivity.java

//package com.example.testactivitytransdata;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class SubActivity extends AppCompatActivity {

    private EditText editText;
    private String message;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_sub);
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.sub), (v, insets) -> {
            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
            return insets;
        });

        // to get message from MainActivity
        Intent intentMain = getIntent();
        message = intentMain.getStringExtra(MainActivity.EXTRA_MESSAGE);

        TextView textView = findViewById(R.id.text_view);
        textView.setText(message);

        editText = findViewById(R.id.edit_text);

        // back to MainActivity
        Button button = findViewById(R.id.back_button);
        button.setOnClickListener(v -> {
            Intent intentSub = new Intent();
            if (editText.getText() != null) {
                String str = message + editText.getText().toString();
                intentSub.putExtra(MainActivity.EXTRA_MESSAGE, str);
            }

            editText.setText("");

            setResult(RESULT_OK, intentSub);

            finish();
        });
    }
}

//package com.example.testactivitytransdata;

import androidx.activity.EdgeToEdge;

import androidx.appcompat.app.AppCompatActivity;

import androidx.core.graphics.Insets;

import androidx.core.view.ViewCompat;

import androidx.core.view.WindowInsetsCompat;

import android.content.Intent;

import android.os.Bundle;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class SubActivity extends AppCompatActivity {

private EditText editText;

private String message;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

EdgeToEdge.enable(this);

setContentView(R.layout.activity_sub);

ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.sub), (v, insets) -> {

Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());

v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);

return insets;

});

// to get message from MainActivity

Intent intentMain = getIntent();

message = intentMain.getStringExtra(MainActivity.EXTRA_MESSAGE);

TextView textView = findViewById(R.id.text_view);

textView.setText(message);

editText = findViewById(R.id.edit_text);

// back to MainActivity

Button button = findViewById(R.id.back_button);

button.setOnClickListener(v -> {

Intent intentSub = new Intent();

if (editText.getText() != null) {

String str = message + editText.getText().toString();

intentSub.putExtra(MainActivity.EXTRA_MESSAGE, str);

}

editText.setText("");

setResult(RESULT_OK, intentSub);

finish();

});

}

Manifest に SubActivity の記述も忘れずに。
AndroidManifest.xml

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

    <application
        ...
        </activity>
        <activity
            android:name=".SubActivity" >
        </activity>

    </application>

</manifest>

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

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

...

<application

...

</activity>

<activity

android:name=".SubActivity" >

</activity>

</application>

</manifest>

その他のレイアウト等のファイルは以下です

その他ファイル

MainActivityのレイアウト
activity_main.xml

<?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:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#dfe"
    tools:context=".MainActivity">

    <!-- Top Title-->
    <TextView
        android:id="@+id/top_title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="40dp"
        android:gravity="center_horizontal"
        android:text="@string/main"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0" />

    <!-- to send text-->
    <TextView
        android:id="@+id/to_sub"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:gravity="end"
        android:text="@string/to_sub"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="@+id/guideline"
        app:layout_constraintTop_toBottomOf="@+id/top_title"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toLeftOf="@+id/edit_text"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintVertical_bias="0.05" />

    <EditText
        android:id="@+id/edit_text"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:autofillHints="@string/hint1"
        android:background="#fff"
        android:text="@string/hint1"
        android:hint="@string/hint1"
        android:inputType="text"
        android:textSize="24sp"
        app:layout_constraintStart_toStartOf="@+id/guideline"
        app:layout_constraintTop_toBottomOf="@+id/top_title"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintVertical_bias="0.05" />

    <!-- returned text-->
    <TextView
        android:id="@+id/fm_sub"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:gravity="end"
        android:text="@string/from_sub"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="@+id/guideline"
        app:layout_constraintTop_toBottomOf="@+id/to_sub"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintVertical_bias="0.03" />

    <TextView
        android:id="@+id/text_view"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:text="@string/message"
        android:textSize="24sp"
        app:layout_constraintStart_toStartOf="@+id/guideline"
        app:layout_constraintTop_toBottomOf="@+id/to_sub"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintVertical_bias="0.03"/>

    <Button
        android:id="@+id/send_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"
        android:gravity="center"
        android:text="@string/move"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.45"/>

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_begin="180dp" />

</androidx.constraintlayout.widget.ConstraintLayout>

100

101

102

103

104

105

106

107

108

109

110

<?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:id="@+id/main"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:background="#dfe"

tools:context=".MainActivity">

<TextView

android:id="@+id/top_title"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_marginTop="40dp"

android:gravity="center_horizontal"

android:text="@string/main"

android:textSize="24sp"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintHorizontal_bias="1.0"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintTop_toTopOf="parent"

app:layout_constraintVertical_bias="0.0" />

<TextView

android:id="@+id/to_sub"

android:layout_width="0dp"

android:layout_height="wrap_content"

android:layout_margin="10dp"

android:gravity="end"

android:text="@string/to_sub"

android:textSize="24sp"

app:layout_constraintEnd_toEndOf="@+id/guideline"

app:layout_constraintTop_toBottomOf="@+id/top_title"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toLeftOf="@+id/edit_text"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintVertical_bias="0.05" />

<EditText

android:id="@+id/edit_text"

android:layout_width="0dp"

android:layout_height="wrap_content"

android:layout_margin="10dp"

android:autofillHints="@string/hint1"

android:background="#fff"

android:text="@string/hint1"

android:hint="@string/hint1"

android:inputType="text"

android:textSize="24sp"

app:layout_constraintStart_toStartOf="@+id/guideline"

app:layout_constraintTop_toBottomOf="@+id/top_title"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintVertical_bias="0.05" />

<TextView

android:id="@+id/fm_sub"

android:layout_width="0dp"

android:layout_height="wrap_content"

android:layout_margin="10dp"

android:gravity="end"

android:text="@string/from_sub"

android:textSize="24sp"

app:layout_constraintEnd_toEndOf="@+id/guideline"

app:layout_constraintTop_toBottomOf="@+id/to_sub"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintVertical_bias="0.03" />

<TextView

android:id="@+id/text_view"

android:layout_width="0dp"

android:layout_height="wrap_content"

android:layout_margin="10dp"

android:text="@string/message"

android:textSize="24sp"

app:layout_constraintStart_toStartOf="@+id/guideline"

app:layout_constraintTop_toBottomOf="@+id/to_sub"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintVertical_bias="0.03"/>

<Button

android:id="@+id/send_button"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_margin="20dp"

android:gravity="center"

android:text="@string/move"

android:textSize="24sp"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintTop_toTopOf="parent"

app:layout_constraintVertical_bias="0.45"/>

<androidx.constraintlayout.widget.Guideline

android:id="@+id/guideline"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:orientation="vertical"

app:layout_constraintGuide_begin="180dp" />

</androidx.constraintlayout.widget.ConstraintLayout>

SubActivityのレイアウト
activity_sub.xml

<?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:id="@+id/sub"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <!-- Top Title-->
    <TextView
        android:id="@+id/top_title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="40dp"
        android:gravity="center_horizontal"
        android:text="@string/sub"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0" />

    <!-- received text-->
    <TextView
        android:id="@+id/to_sub"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:gravity="end"
        android:text="@string/from_main"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="@+id/guideline2"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toLeftOf="@+id/edit_text"
        app:layout_constraintTop_toBottomOf="@+id/top_title"
        app:layout_constraintVertical_bias="0.05" />

    <TextView
        android:id="@+id/text_view"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:text="@string/message"
        android:textSize="24sp"
        app:layout_constraintStart_toStartOf="@+id/guideline2"
        app:layout_constraintTop_toBottomOf="@+id/top_title"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintVertical_bias="0.05"/>

    <!-- send text-->
    <TextView
        android:id="@+id/fm_sub"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:gravity="end"
        android:text="@string/to_main"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="@+id/guideline2"
        app:layout_constraintTop_toBottomOf="@+id/to_sub"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintVertical_bias="0.03" />

    <EditText
        android:id="@+id/edit_text"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:autofillHints="@string/hint2"
        android:background="#fff"
        android:text="@string/hint2"
        android:hint="@string/hint2"
        android:inputType="text"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintStart_toStartOf="@+id/guideline2"
        app:layout_constraintTop_toBottomOf="@+id/to_sub"
        app:layout_constraintVertical_bias="0.03" />

    <Button
        android:id="@+id/back_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"
        android:gravity="center"
        android:text="@string/back"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.45"/>

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_begin="180dp" />

</androidx.constraintlayout.widget.ConstraintLayout>

100

101

102

103

104

105

106

107

108

109

<?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:id="@+id/sub"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity">

<TextView

android:id="@+id/top_title"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_marginTop="40dp"

android:gravity="center_horizontal"

android:text="@string/sub"

android:textSize="24sp"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintHorizontal_bias="1.0"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintTop_toTopOf="parent"

app:layout_constraintVertical_bias="0.0" />

<TextView

android:id="@+id/to_sub"

android:layout_width="0dp"

android:layout_height="wrap_content"

android:layout_margin="10dp"

android:gravity="end"

android:text="@string/from_main"

android:textSize="24sp"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintEnd_toEndOf="@+id/guideline2"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toLeftOf="@+id/edit_text"

app:layout_constraintTop_toBottomOf="@+id/top_title"

app:layout_constraintVertical_bias="0.05" />

<TextView

android:id="@+id/text_view"

android:layout_width="0dp"

android:layout_height="wrap_content"

android:layout_margin="10dp"

android:text="@string/message"

android:textSize="24sp"

app:layout_constraintStart_toStartOf="@+id/guideline2"

app:layout_constraintTop_toBottomOf="@+id/top_title"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintVertical_bias="0.05"/>

<TextView

android:id="@+id/fm_sub"

android:layout_width="0dp"

android:layout_height="wrap_content"

android:layout_margin="10dp"

android:gravity="end"

android:text="@string/to_main"

android:textSize="24sp"

app:layout_constraintEnd_toEndOf="@+id/guideline2"

app:layout_constraintTop_toBottomOf="@+id/to_sub"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintVertical_bias="0.03" />

<EditText

android:id="@+id/edit_text"

android:layout_width="0dp"

android:layout_height="wrap_content"

android:layout_margin="10dp"

android:autofillHints="@string/hint2"

android:background="#fff"

android:text="@string/hint2"

android:hint="@string/hint2"

android:inputType="text"

android:textSize="24sp"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintStart_toStartOf="@+id/guideline2"

app:layout_constraintTop_toBottomOf="@+id/to_sub"

app:layout_constraintVertical_bias="0.03" />

<Button

android:id="@+id/back_button"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_margin="20dp"

android:gravity="center"

android:text="@string/back"

android:textSize="24sp"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintTop_toTopOf="parent"

app:layout_constraintVertical_bias="0.45"/>

<androidx.constraintlayout.widget.Guideline

android:id="@+id/guideline2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:orientation="vertical"

app:layout_constraintGuide_begin="180dp" />

</androidx.constraintlayout.widget.ConstraintLayout>

リソースです
strings.xml

<resources>
    <string name="app_name">YourAppName</string>
    <string name="main">Main Activity</string>
    <string name="sub">Sub Activity</string>
    <string name="hint1">Message to Sub</string>
    <string name="hint2">Message to Main</string>
    <string name="to_main">"  to Main"</string>
    <string name="from_main">"from Main"</string>
    <string name="to_sub">"  to Sub"</string>
    <string name="from_sub">"from Sub"</string>
    <string name="move">move</string>
    <string name="back">back</string>
    <string name="message">message</string>
</resources>

<string name="app_name">YourAppName</string>

<string name="main">Main Activity</string>

<string name="sub">Sub Activity</string>

<string name="hint1">Message to Sub</string>

<string name="hint2">Message to Main</string>

<string name="message">message</string>

</resources>