2022-10-24学习内容

1.日期对话框DatePickerDialog

1.1activity_date_picker.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="5dp">

    <DatePicker
        android:id="@+id/dp_date"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:datePickerMode="spinner"
        android:calendarViewShown="false"/>

    <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>

1.2DatePickerActivity.java

package com.example.chapter05;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.DatePicker;
import android.widget.TextView;

public class DatePickerActivity extends AppCompatActivity implements View.OnClickListener {

    private DatePicker dp_date;
    private TextView tv_date;

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

    @Override
    public void onClick(View v) {
        switch(v.getId()) {
            case R.id.btn_ok:
                String desc = String.format("您选择的日期是%d年%d月%d日", dp_date.getYear(), dp_date.getMonth() + 1, dp_date.getDayOfMonth());
                tv_date.setText(desc);
                break;
        }
    }
}

1.3效果：

1.4activity_date_picker.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="5dp">

    <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:datePickerMode="spinner"
        android:calendarViewShown="false"/>

    <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>

1.5DatePickerActivity.java

package com.example.chapter05;

import androidx.appcompat.app.AppCompatActivity;

import android.app.DatePickerDialog;
import android.os.Bundle;
import android.view.View;
import android.widget.DatePicker;
import android.widget.TextView;

import java.util.Calendar;

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

    private DatePicker dp_date;
    private TextView tv_date;

    @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_date = findViewById(R.id.tv_date);
        dp_date = findViewById(R.id.dp_date);
    }

    @Override
    public void onClick(View v) {
        switch(v.getId()) {
            case R.id.btn_ok:
                String desc = String.format("您选择的日期是%d年%d月%d日", dp_date.getYear(), dp_date.getMonth() + 1, dp_date.getDayOfMonth());
                tv_date.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 dialog = new DatePickerDialog(this, this, 2090, 5, 1);
                // 显示日期对话框
                dialog.show();
                break;
        }
    }

    @Override
    public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
        String desc = String.format("您选择的日期是%d年%d月%d日", year, month + 1, dayOfMonth);
        tv_date.setText(desc);
    }
}

1.6效果：

 

 

2.时间对话框

2.1activity_time_picker.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="5dp">

    <Button
        android:id="@+id/btn_time"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="请选择时间"/>

    <TimePicker
        android:id="@+id/tp_time"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:timePickerMode="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_time"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

2.2TimePickerActivity.java

package com.example.chapter05;

import androidx.appcompat.app.AppCompatActivity;

import android.app.DatePickerDialog;
import android.app.TimePickerDialog;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.widget.TimePicker;

import java.util.Calendar;

public class TimePickerActivity extends AppCompatActivity implements View.OnClickListener, TimePickerDialog.OnTimeSetListener {

    private TimePicker tp_time;
    private TextView tv_time;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_time_picker);
        findViewById(R.id.btn_ok).setOnClickListener(this);
        findViewById(R.id.btn_time).setOnClickListener(this);
        tp_time = findViewById(R.id.tp_time);
        tp_time.setIs24HourView(true);
        tv_time = findViewById(R.id.tv_time);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn_ok:
                String desc = String.format("您选择的日期是%d时%d分", tp_time.getHour(), tp_time.getMinute());
                tv_time.setText(desc);
                break;
            case R.id.btn_time:
                // 获取日历的一个实例，里面包含了当前的时分秒
                Calendar calendar = Calendar.getInstance();

                // 构建一个时间对话框，该对话框已经集成了时间选择器
                TimePickerDialog dialog = new TimePickerDialog(this, android.R.style.Theme_Holo_Light_Dialog, this,
                        calendar.get(Calendar.HOUR_OF_DAY),
                        calendar.get(Calendar.MINUTE),
                        true); // true表示24小时制，false表示12小时制
                dialog.show();
                break;
        }
    }

    @Override
    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
        String desc = String.format("您选择的日期是%d时%d分", hourOfDay, minute);
        tv_time.setText(desc);
    }
}

2.3效果：