android開発 シンプルなダイアログ表示

2019 Jun. 30.
2019 Jun. 29.
2019 Jun. 22.
2019 May 31.
2019 May 30.

参照元
https://developer.android.com/guide/topics/ui/dialogs
https://akira-watson.com/android/alertdialog.html
http://furudate.hatenablog.com/entry/2014/01/09/162421

[MainActivity]

package YOUR.PACKAGE.alertdialogsample;

import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.support.annotation.NonNull;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;


public class MainActivity extends AppCompatActivity {

    Button button_dialog1, button_dialog2, button_dialog3;
    private TextView text_view;
    private FragmentManager flagmentManager;

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

        text_view = findViewById(R.id.text_view);
        button_dialog1 = findViewById(R.id.button_dialog1);
        button_dialog2 = findViewById(R.id.button_dialog2);
        button_dialog3 = findViewById(R.id.button_dialog3);


        // button_dialog1ボタンタップでAlertを表示させる
        button_dialog1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                flagmentManager = getSupportFragmentManager();

                // DialogFragment を継承したAlertDialogFragment1のインスタンス
                AlertDialogFragment1 dialogFragment = AlertDialogFragment1.newInstance(100);
                // DialogFragmentの表示
                dialogFragment.show(flagmentManager, "test alert dialog1");
            }
        });


        // button_dialog2ボタンタップでダイアログのメッセージを変えたAlertを表示させる
        //   newInstance()への引数を変更してメッセージを変える
        button_dialog2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                flagmentManager = getSupportFragmentManager();

                // DialogFragmentを継承したAlertDialogFragment2のインスタンス
                AlertDialogFragment1 dialogFragment = AlertDialogFragment1.newInstance(200);
                // DialogFragmentの表示
                dialogFragment.show(flagmentManager, "test alert dialog2");
            }
        });


        // button_dialog3ボタンタップでItemを選択するAlertを表示させる
        button_dialog3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                flagmentManager = getSupportFragmentManager();

                // DialogFragment を継承したAlertDialogFragmentのインスタンス
                AlertDialogFragment2 dialogFragment = new AlertDialogFragment2();
                // DialogFragmentの表示
                dialogFragment.show(flagmentManager, "test alert dialog");
            }
        });
    }


    public void setTextView(String message){
        text_view.setText(message);
    }


    /*
     * DialogFragmentを継承したクラスAlertDialogFragment1
     */
    public static class AlertDialogFragment1 extends DialogFragment {

        /*
         * コンストラクタを記述してはならない。
         * newInstance()でのsetArguments、onCreateDialog()でのgetArgumentsを利用する。
         */
        public static AlertDialogFragment1 newInstance( int requestCode) {
            AlertDialogFragment1 fragment = new AlertDialogFragment1();

            Bundle arguments = new Bundle();
            arguments.putInt("reqCode", requestCode);
            fragment.setArguments(arguments);

            return fragment;
        }

        @Override
        @NonNull
        public Dialog onCreateDialog(Bundle savedInstanceState) {

            int requestCode = getArguments().getInt("reqCode");

            AlertDialog.Builder alert = new AlertDialog.Builder(getActivity());

            switch (requestCode) {
                case 100:
                    alert.setTitle("Test AlertDialog1");
                    alert.setMessage("Message is 100");
                    break;

                case 200:
                    alert.setTitle("Test AlertDialog2");
                    alert.setMessage("Message is 200");
                    break;

            }
            alert.setPositiveButton(R.string.dialog_ok, null);

            return alert.create();
        }
    }


    /*
     * DialogFragmentを継承したクラスAlertDialogFragment2
     */
    public static class AlertDialogFragment2 extends DialogFragment {
        // 選択肢のリスト
        private String[] menulist = {"選択(1)","選択(2)","選択(3)"};

        @Override
        @NonNull
        public Dialog onCreateDialog(Bundle savedInstanceState) {

            AlertDialog.Builder alert = new AlertDialog.Builder(getActivity());

            alert.setTitle("Test AlertDialog3");
            alert.setItems(menulist, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int idx) {
                    // 選択１
                    if (idx == 0) {
                        setMassage(menulist[0]);
                    }
                    // 選択２
                    else if (idx == 1) {
                        setMassage(menulist[1]);
                    }
                    // 選択３, idx == 2
                    else{
                        setMassage(menulist[2]);
                    }
                }
            });
            return alert.create();
        }


        private void setMassage(String message) {
            MainActivity mainActivity = (MainActivity) getActivity();
            if (mainActivity != null) {
                mainActivity.setTextView(message);
            }
        }
    }
}