[Android Studio] Fragmentで作成した値をActivityに返す

実行環境：Android Studio 3.6 / JAVA

これまで紹介してきたProjectの完成形です。以下の動画のような動きになります。

https://lifeprosper.link/biz/wp-content/uploads/2020/02/und.webm

• MainActivityから画面遷移したSubActivityでFragmentを呼びだす
• 各Fragmentで取得した値はSubActivityを通してMainActivityに戻す
• MainActivityの意図したTextViewにそれぞれの値が格納されるようにする
• Android StudioのChipやSeekbarを使う

前回のFragment内でEditTextとSeekBarの使い方から追加したのは以下のセッターだけ。

SubActivity.java

public static void setNumbers(String s){
    powerNumb = s;
}

KokyuFragment.java と CosmoFragment.java

 SubActivity.setNumbers(...); 

とりあえず動いた感が否めないですが、これが今の私の精一杯。精進してまいります。以下がこのProjectに関する記事です。

• 1.[Android Studio]Intentを使用した画面遷移と複数値の受け渡し
• 2.[Android Studio]Chip Groupを使用したFragment制御
• 3.[Android Studio]Fragment内でEditTextとSeekBar
• 4.[Android Studio]Fragmentで作成した値をActivityに返す

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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/amtxt_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="24dp"
        android:layout_marginTop="24dp"
        android:text="Setup attack power"
        android:textSize="30sp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/amtxt_tanji"
        android:layout_width="wrap_content"
        android:layout_height="35dp"
        android:layout_marginStart="24dp"
        android:layout_marginTop="32dp"
        android:text="竈門炭治郎"
        android:textSize="24sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/amtxt_title" />

    <TextView
        android:id="@+id/amtxt_shaka"
        android:layout_width="wrap_content"
        android:layout_height="35dp"
        android:layout_marginStart="24dp"
        android:layout_marginTop="32dp"
        android:text="バルゴのシャカ"
        android:textSize="24sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/amtxt_tanji_param" />

    <TextView
        android:id="@+id/amtxt_tanji_param"
        android:layout_width="300dp"
        android:layout_height="35dp"
        android:layout_marginStart="24dp"
        android:layout_marginTop="8dp"
        android:gravity="center"
        android:textSize="24sp"
        android:background="@drawable/text_frame"
        android:text="00000"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/amtxt_tanji" />

    <TextView
        android:id="@+id/amtxt_shaka_param"
        android:layout_width="300dp"
        android:layout_height="35dp"
        android:layout_marginStart="24dp"
        android:layout_marginTop="8dp"
        android:background="@drawable/text_frame"
        android:gravity="center"
        android:text="00000"
        android:textSize="24sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/amtxt_shaka" />

    <Button
        android:id="@+id/ambut_tanji"
        android:layout_width="wrap_content"
        android:layout_height="35dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="32dp"
        android:gravity="center"
        android:text="Setup"
        app:layout_constraintStart_toEndOf="@+id/amtxt_tanji"
        app:layout_constraintTop_toBottomOf="@+id/amtxt_title" />

    <Button
        android:id="@+id/ambut_shaka"
        android:layout_width="wrap_content"
        android:layout_height="35dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="32dp"
        android:gravity="center"
        android:text="Setup"
        app:layout_constraintStart_toEndOf="@+id/amtxt_shaka"
        app:layout_constraintTop_toBottomOf="@+id/amtxt_tanji_param" />

    <TextView
        android:id="@+id/satxt_page"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="32dp"
        android:layout_marginTop="32dp"
        android:textSize="20dp"
        android:text="Main Activity"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/amtxt_shaka_param" />

</androidx.constraintlayout.widget.ConstraintLayout>

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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#e6b8c2"
    tools:context=".MainActivity">

    <FrameLayout
        android:id="@+id/container1"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="100dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="8dp"
        app:layout_constraintBottom_toTopOf="@+id/sabut_register"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/satxt_title" />

    <com.google.android.material.chip.ChipGroup
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_marginTop="8dp"
        android:layout_marginBottom="8dp"
        android:clickable="false"
        app:layout_constraintBottom_toTopOf="@+id/container1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/satxt_title"
        app:singleSelection="true">

        <com.google.android.material.chip.Chip
            android:id="@+id/chip_kokyu"
            style="@style/Widget.MaterialComponents.Chip.Choice"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:text="パワー：呼吸"
            android:textAppearance="?android:attr/textAppearanceMedium" />

        <com.google.android.material.chip.Chip
            android:id="@+id/chip_cosmo"
            style="@style/Widget.MaterialComponents.Chip.Choice"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:text="パワー：コスモ"
            android:textAppearance="?android:attr/textAppearanceMedium" />
    </com.google.android.material.chip.ChipGroup>

    <Button
        android:id="@+id/sabut_register"
        android:layout_width="wrap_content"
        android:layout_height="35dp"
        android:layout_marginEnd="36dp"
        android:layout_marginBottom="32dp"
        android:text="Register"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent" />

    <TextView
        android:id="@+id/satxt_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:textSize="20dp"
        android:text="パワー種類の選択"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/satxt_page"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="32dp"
        android:layout_marginBottom="32dp"
        android:text="Sub Activity"
        android:textSize="20dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <TextView
        android:id="@+id/satxt_test"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="16dp"
        android:text="000"
        app:layout_constraintStart_toEndOf="@+id/satxt_title"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

kokyu_fragment.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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#a2bd95"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:textSize="20dp"
        android:text="KokyuFragment"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="32dp"
        android:layout_marginTop="32dp"
        android:text="Kokyuパワー"
        android:textSize="20dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button5" />

    <EditText
        android:id="@+id/editText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="32dp"
        android:layout_marginTop="32dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:text="Power値を入力"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView" />

    <Button
        android:id="@+id/button5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="32dp"
        android:layout_marginTop="32dp"
        android:text="Set"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText" />

</androidx.constraintlayout.widget.ConstraintLayout>

cosmo_fragment.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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#fde4a0"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:textSize="20dp"
        android:text="CosmoFragment"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <SeekBar
        android:id="@+id/seekBar"
        android:layout_width="260dp"
        android:layout_height="29dp"
        android:layout_marginStart="32dp"
        android:layout_marginTop="32dp"
        android:max="9999"
        android:progress="5000"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="32dp"
        android:layout_marginTop="32dp"
        android:text="Cosmoパワー"
        android:textSize="20dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/seekBar" />

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

package com.example.sampleattack;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    public static final String MAIN_KEY = "MAIN_KEY";
    static final int MAIN_S = 100;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button sendButton1 = findViewById(R.id.ambut_tanji);
        sendButton1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(getApplication(), SubActivity.class);
                int e = 1;
                intent.putExtra(MAIN_KEY, e);
                startActivityForResult(intent, MAIN_S);
            }
        });
        Button sendButton2 = findViewById(R.id.ambut_shaka);
        sendButton2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(getApplication(), SubActivity.class);
                int e = 2;
                intent.putExtra(MAIN_KEY, e);
                startActivityForResult(intent, MAIN_S);
            }
        });
    }

    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        super.onActivityResult(requestCode, resultCode, intent);

        if (resultCode == RESULT_OK && requestCode == MAIN_S && null != intent) {
            int key = intent.getIntExtra(SubActivity.SUB_KEY, 0);
            switch (key) {
                case 1:
                    TextView textView1 = findViewById(R.id.amtxt_tanji_param);
                    String res1 = intent.getStringExtra(SubActivity.SUB_KEY2);
                    textView1.setText(res1);
                    break;
                case 2:
                    TextView textView2 = findViewById(R.id.amtxt_shaka_param);
                    String res2 = intent.getStringExtra(SubActivity.SUB_KEY2);
                    textView2.setText(res2);
                    break;
            }
        }
    }
}

SubActivity.java

package com.example.sampleattack;

import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import com.google.android.material.chip.Chip;

public class SubActivity extends AppCompatActivity {
    public static final String SUB_KEY = "SUB_KEY";
    public static final String SUB_KEY2 = "SUB_KEY2";
    private int key;
    private static String powerNumb;
    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sub);

        Chip chipKokyu = findViewById(R.id.chip_kokyu);
        chipKokyu.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                FragmentManager fragmentManager = getSupportFragmentManager();
                FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.addToBackStack(null);
                fragmentTransaction.replace(R.id.container1, new KokyuFragment());
                fragmentTransaction.commit();
            }
        });

        Chip chipCosmo = findViewById(R.id.chip_cosmo);
        chipCosmo.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                FragmentManager fragmentManager = getSupportFragmentManager();
                FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.addToBackStack(null);
                fragmentTransaction.replace(R.id.container1, new CosmoFragment());
                fragmentTransaction.commit();
            }
        });

        Intent intent = getIntent();
        key = intent.getIntExtra(MainActivity.MAIN_KEY,0);
        String testtxt = String.valueOf(key);
        TextView textView = findViewById(R.id.satxt_test);
        textView.setText(testtxt);

        Button returnButton = findViewById(R.id.sabut_register);
        returnButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                Intent intent = new Intent();
                String power = powerNumb;
                intent.putExtra(SUB_KEY, key);
                intent.putExtra(SUB_KEY2, power);
                setResult(RESULT_OK, intent);
                finish();
            }
        });
    }
    public static void setNumbers(String s){
        powerNumb = s;
    }
}

KokyuFragment.java

package com.example.sampleattack;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import androidx.fragment.app.Fragment;

public class KokyuFragment extends Fragment{
    EditText editText5;
    TextView textView;
    Button button5;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        return inflater.inflate(R.layout.kokyu_fragment, container, false);
    }
    @Override
    public void onStart(){
        super.onStart();
        findViews();

        button5.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String text = editText5.getText().toString();
                String powerKokyu = "Kokyuパワー:"+text;
                textView.setText(powerKokyu);
                SubActivity.setNumbers(powerKokyu);
            }
        });
    }
    protected void findViews() {
        editText5 = (EditText) getActivity().findViewById(R.id.editText);
        textView = (TextView) getActivity().findViewById(R.id.textView5);
        button5 = (Button) getActivity().findViewById(R.id.button5);
    }
}

CosmoFragment.java

package com.example.sampleattack;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.SeekBar;
import android.widget.TextView;

import androidx.fragment.app.Fragment;

public class CosmoFragment extends Fragment {
    SeekBar seekbar;
    TextView textView;
    private static int power;


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        return inflater.inflate(R.layout.cosmo_fragment, container, false);
    }
    @Override
    public void onStart(){
        super.onStart();
        findViews();
        seekbar.setOnSeekBarChangeListener(
                new SeekBar.OnSeekBarChangeListener() {
                    public void onProgressChanged(SeekBar seekBar,int progress, boolean fromUser) {
                        textView.setText("Cosmoパワー："+seekBar.getProgress());
                    }
                    public void onStartTrackingTouch(SeekBar seekBar) {}

                    public void onStopTrackingTouch(SeekBar seekBar) {
                        power = seekBar.getProgress();
                        String powerNumb = "Cosmoパワー："+power;
                        textView.setText(powerNumb);
                        SubActivity.setNumbers(powerNumb);
                    }
                }
        );
    }
    protected void findViews() {
        seekbar = (SeekBar) getActivity().findViewById(R.id.seekBar);
        textView = (TextView) getActivity().findViewById(R.id.textView2);
    }
}

AndroidManifest.xml

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

    <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=".SubActivity"
            android:label="@string/app_name">
        </activity>
    </application>

</manifest>