Question

我想从Date Picker对话框中以“ Saturday，6/10/2018”的格式获取日期。问题是，当我从当前月份选择任何日期时，它会显示真实的输出，但是当我从上个月或下个月选择任何日期时，它将显示错误的星期几。

注意：先前的问题对我没有帮助...

这是我的代码：

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"
    android:gravity="center"
    android:orientation="vertical"
    tools:context=".MainActivity">
    <Button
        android:id="@+id/pickDateBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:minWidth="200dp"
        android:text="Pick Full Date" />
    <TextView
        android:id="@+id/displayDateTv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Full Date will display here..."
        android:textColor="#000"
        android:textSize="20sp" />
</LinearLayout>

MainActivity.kt

package com.blogspot.atifsoftwares.fulldateformat

import android.app.DatePickerDialog
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_main.*
import java.text.SimpleDateFormat
import java.util.*

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        pickDateBtn.setOnClickListener {
            pickDate()
        }
    }

    private fun pickDate() {
        val c = Calendar.getInstance()
        val year = c.get(Calendar.YEAR)
        val month = c.get(Calendar.MONTH)
        val day = c.get(Calendar.DAY_OF_MONTH)
        val dpd = DatePickerDialog(this, DatePickerDialog.OnDateSetListener { view, mYear, monthOfYear, dayOfMonth ->

            val simpleDateFormat = SimpleDateFormat("EEEE")
            val date = Date(mYear, month, dayOfMonth - 1)
            val dayString = simpleDateFormat.format(date) //returns true day name for current month only

            displayDateTv.text = "$dayString, $dayOfMonth/${monthOfYear + 1}/$mYear"

        }, year, month, day)
        dpd.show()

    }
}

Answer 1

val dpd = DatePickerDialog(this, DatePickerDialog.OnDateSetListener { view, mYear, monthOfYear, dayOfMonth ->

        val simpleDateFormat = SimpleDateFormat("EEEE")
        val date = Date(mYear, month, dayOfMonth - 1)
        val dayString = simpleDateFormat.format(date) //returns true day name for current month only

        displayDateTv.text = "$dayString, $dayOfMonth/${monthOfYear + 1}/$mYear"

    }, year, month, day)

更改 val date = Date(mYear, month, dayOfMonth - 1) 到val date = Date(mYear, monthOfYear, dayOfMonth - 1)

说明：您使用的是关闭月份变量，而不是初始化Date类时在lambda中获得的变量。

Answer 2

val dpd = DatePickerDialog(this, DatePickerDialog.OnDateSetListener { view, mYear, monthOfYear, dayOfMonth ->

        val simpleDateFormat = SimpleDateFormat("EEEE")
        val date = Date(mYear, monthOfYear, dayOfMonth - 1)
        val dayString = simpleDateFormat.format(date) //returns true day name for current month only

        displayDateTv.text = "$dayString, $dayOfMonth/${monthOfYear + 1}/$mYear"

    }, year, month, day)

您使用的是封闭月变量，而不是初始化Date类时在lambda中获得的变量。检查此修改后的代码。

从日期选择器获取日期名称？

2 个答案: