Android实现TextView时间求和并显示的代码方案

实现需求：

• 两个TextView分别对应两个时间选择按钮，点击按钮弹出时间选择器，选择后时间显示在对应TextView中
• 点击Sum按钮，将两个TextView中的时间相加，结果显示在第三个TextView里

修改后的MainActivity.java代码 #

package com.example.myapplication_lab4;

import androidx.appcompat.app.AppCompatActivity;

import android.app.TimePickerDialog;
import android.content.Intent;
import android.os.Bundle;
import android.text.format.DateUtils;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.TimePicker;

import java.util.Calendar;

public class MainActivity extends AppCompatActivity {
    TextView viewTime1;
    TextView viewTime2;
    TextView sum;
    Button time1;
    Button time2;
    Button btnSum;
    // 为两个时间分别创建Calendar实例
    Calendar dateTime1 = Calendar.getInstance();
    Calendar dateTime2 = Calendar.getInstance();

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

        viewTime1 = findViewById(R.id.viewTime1);
        viewTime2 = findViewById(R.id.viewTime2);
        sum = findViewById(R.id.sum);
        time1 = findViewById(R.id.time1);
        time2 = findViewById(R.id.time2);
        btnSum = findViewById(R.id.btnSum);
    }

    // 弹出时间选择窗口设置TextView1的时间
    public void setTime(View v) {
        new TimePickerDialog(MainActivity.this, t,
                dateTime1.get(Calendar.HOUR_OF_DAY),
                dateTime1.get(Calendar.MINUTE), true)
                .show();
    }

    // 弹出时间选择窗口设置TextView2的时间
    public void setTime2(View v) {
        new TimePickerDialog(MainActivity.this, t2,
                dateTime2.get(Calendar.HOUR_OF_DAY),
                dateTime2.get(Calendar.MINUTE), true)
                .show();
    }

    // 设置TextView1的初始时间显示
    private void setInitialDateTime() {
        viewTime1.setText(DateUtils.formatDateTime(this,
                dateTime1.getTimeInMillis(),
                DateUtils.FORMAT_SHOW_TIME));
    }

    // 设置TextView2的初始时间显示
    private void setInitialDateTime2() {
        viewTime2.setText(DateUtils.formatDateTime(this,
                dateTime2.getTimeInMillis(),
                DateUtils.FORMAT_SHOW_TIME));
    }

    // TextView1的时间选择监听器
    TimePickerDialog.OnTimeSetListener t = new TimePickerDialog.OnTimeSetListener() {
        public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
            dateTime1.set(Calendar.HOUR_OF_DAY, hourOfDay);
            dateTime1.set(Calendar.MINUTE, minute);
            setInitialDateTime();
        }
    };

    // TextView2的时间选择监听器
    TimePickerDialog.OnTimeSetListener t2 = new TimePickerDialog.OnTimeSetListener() {
        public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
            dateTime2.set(Calendar.HOUR_OF_DAY, hourOfDay);
            dateTime2.set(Calendar.MINUTE, minute);
            setInitialDateTime2();
        }
    };

    // 跳转至第二个Activity（无关逻辑保留）
    public void onClick(View view) {
        if (view.getId() == R.id.btnActTwo) {
            Intent intent = new Intent(this, Activity2.class);
            startActivity(intent);
        }
    }

    // 时间求和并显示的逻辑实现
    public void onClick2(View view) {
        // 计算两个时间的总分钟数
        int totalMinutes1 = dateTime1.get(Calendar.HOUR_OF_DAY) * 60 + dateTime1.get(Calendar.MINUTE);
        int totalMinutes2 = dateTime2.get(Calendar.HOUR_OF_DAY) * 60 + dateTime2.get(Calendar.MINUTE);
        int totalMinutes = totalMinutes1 + totalMinutes2;
        // 转换为小时和分钟
        int hours = totalMinutes / 60;
        int minutes = totalMinutes % 60;
        // 格式化显示结果
        sum.setText(String.format("%02d:%02d", hours, minutes));
    }
}

对应布局XML代码 #

<?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:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="This is First Activity"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Go to Second Activity"
        android:id="@+id/btnActTwo"
        android:onClick="onClick">

    </Button>

    <TextView
        android:id="@+id/viewTime1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Time1" />

    <Button
        android:id="@+id/time1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Choose Time 1"
        android:onClick="setTime"/>

    <TextView
        android:id="@+id/viewTime2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Time2" />

    <Button
        android:id="@+id/time2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Choose Time 2"
        android:onClick="setTime2"
        />

    <TextView
        android:id="@+id/sum"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Sum" />

    <Button
        android:id="@+id/btnSum"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="SUM"
        android:onClick="onClick2"/>
</LinearLayout>

内容的提问来源于stack exchange，提问作者k.pa