AS Room編③解説part1～DatePicker/TimePickerの使用および、時間順に並べ替え、ExecutorSerVice使用～

DatePickerを配置してみました。

MainActivity.java

package com.example.taskdatabasedemo1;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

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

        Button calendarBtn = findViewById(R.id.calendarBtn);
        calendarBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                DatePickerDialogFragment datePicker = new DatePickerDialogFragment();
                datePicker.show(getSupportFragmentManager(),"DatePicker");

            }
        });
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:gravity="center_horizontal"
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="When"/>

    <EditText
        android:id="@+id/whenEdit"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

    <Button
        android:id="@+id/calendarBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="カレンダーで選択"/>

</LinearLayout>

DatePickerDialogFragment.java

package com.example.taskdatabasedemo1;

import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.Bundle;
import android.util.Log;
import android.widget.DatePicker;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.DialogFragment;

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;

public class DatePickerDialogFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener {
    @NonNull
    @Override
    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState){
        LocalDate dateNow = LocalDate.now();
        int year = dateNow.getYear();
        int month = dateNow.getMonthValue();
        int day = dateNow.getDayOfMonth();

        Dialog datePickerDialog = new DatePickerDialog(getActivity(),this,year,month,day);
        return datePickerDialog;
    }

    @Override
    public void onDateSet(DatePicker datePicker, int year, int month, int day) {
        String dateStr = datePicker.getYear()+"/"+datePicker.getMonth()+"/"+datePicker.getDayOfMonth();
        Log.v("MY_LOG",dateStr);

    }
}