一、前言：这篇文章是关于DatePickerDialog，点击按钮出现一个日期选择器对话框，通过点击确认把选则的日期显示到文本控件上。

二、上代码

页面布局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"
    android:orientation="vertical"
    tools:context=".picker.DatePickerActivity">
    <Button
        android:id="@+id/btn_date"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="请选择日期"/>
    <DatePicker
        android:id="@+id/dp_date"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:calendarViewShown="false"
        android:datePickerMode="spinner"/>
    <Button
        android:id="@+id/btn_ok"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="确定"/>
    <TextView
        android:id="@+id/tv_date"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

对应的Activity：DatePickerActivity

public class DatePickerActivity extends AppCompatActivity implements View.OnClickListener, DatePickerDialog.OnDateSetListener {

    private DatePicker dp_date;
    private TextView tv_result;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_date_picker);
        findViewById(R.id.btn_ok).setOnClickListener(this);
        findViewById(R.id.btn_date).setOnClickListener(this);
        tv_result = findViewById(R.id.tv_date);
        dp_date = findViewById(R.id.dp_date);



    }

    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.btn_ok:
                String desc = String.format("您选择的日期是:%d年%d月%d月",dp_date.getYear(),dp_date.getMonth()+1,dp_date.getDayOfMonth());
                tv_result.setText(desc);
                break;
            case R.id.btn_date:
//                //获取日历的一个实例。里面包含了当前的年月日
//                Calendar calendar = Calendar.getInstance();
//                calendar.get(Calendar.YEAR);
//                calendar.get(Calendar.MONTH);
//                calendar.get(Calendar.DAY_OF_MONTH);
                DatePickerDialog datePickerDialog = new DatePickerDialog(this,this,2023,5,11);
               //显示对话框
                datePickerDialog.show();
                break;
        }
    }

    @Override
    public void onDateSet(DatePicker datePicker, int i, int i1, int i2) {
        String desc = String.format("您选择的日期是：%d年%d月%d月",i,i1+1,i2);
        tv_result.setText(desc);

    }
}

运行结果展示：