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无法在片段中显示日期选择器对话框

分类：编程问答

如何解决无法在片段中显示日期选择器对话框

我正在尝试在插入片段中实现一个日期选择器对话框。在插入片段中，我添加了一个按钮来显示日期选择器对话框并在文本视图中显示所选日期。

问题

当我尝试运行代码时，它会显示这些错误。

Type mismatch: inferred type is AddFragment but Context was expected
Type mismatch: inferred type is String but Editable? was expected

在 Add Fragment.kt 文件中，

它在 this 函数中的 view & dobDatePicker() 关键字显示红色下划线。

注意：我使用 view binding 来调用 UI id。

这是fragment_add.xml的代码

<?xml version="1.0" encoding="utf-8"?>
<ScrollView 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:layout_margin="16dp"
    android:fillViewport="true"
    tools:context=".fragments.add.AddFragment">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <!-- NSU ID INPUT-->
        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/nsu_id"
            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/nsu_id"
            app:endIconMode="clear_text"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.5"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent">

            <com.google.android.material.textfield.TextInputEditText
                android:id="@+id/selected_date"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:fontFamily="@font/roboto"
                android:inputType="number"
                android:maxLength="7"
                android:textAppearance="@style/TextAppearance.MdcTypographyStyles.Subtitle1"
                android:typeface="normal" />

        </com.google.android.material.textfield.TextInputLayout>

        <!-- Student name-->
        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/student_name"
            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            android:hint="@string/student_name"
            android:orientation="vertical"
            app:endIconMode="clear_text"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/nsu_id">

            <com.google.android.material.textfield.TextInputEditText
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:fontFamily="@font/roboto"
                android:inputType="textPersonName"
                android:textAppearance="@style/TextAppearance.MdcTypographyStyles.Subtitle1"
                android:typeface="normal" />

        </com.google.android.material.textfield.TextInputLayout>

        <!-- School list-->
        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/school_list_dropdown"
            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox.ExposedDropdownMenu"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            android:hint="@string/select_academic_school"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/student_name">

            <AutoCompleteTextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:inputType="none"
                tools:ignore="LabelFor" />

        </com.google.android.material.textfield.TextInputLayout>

        <!-- Department list-->
        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/department_list_dropdown"
            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox.ExposedDropdownMenu"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            android:hint="@string/department_name"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/school_list_dropdown">

            <AutoCompleteTextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:inputType="none"
                tools:ignore="LabelFor" />

        </com.google.android.material.textfield.TextInputLayout>

        <!-- Date of birth text field-->
        <com.google.android.material.textview.MaterialTextView
            android:id="@id/selected_date"
            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
            android:layout_width="300dp"
            android:layout_height="52dp"
            android:layout_marginTop="8dp"
            android:fontFamily="@font/roboto"
            android:gravity="center_vertical"
            android:hint="@string/date_of_birth"
            android:textAppearance="@style/TextAppearance.MdcTypographyStyles.Subtitle1"
            android:typeface="normal"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/department_list_dropdown" />

        <!-- date picker button -->

        <com.google.android.material.button.MaterialButton
            android:id="@+id/datePicker_button"
            android:layout_width="52dp"
            android:layout_height="52dp"
            android:insetLeft="0dp"
            android:insetTop="0dp"
            android:insetRight="0dp"
            android:insetBottom="0dp"
            app:icon="@drawable/ic_outline_calendar_today_24"
            app:iconGravity="textStart"
            app:iconPadding="0dp"
            app:layout_constraintBottom_toBottomOf="@+id/selected_date"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="1.0"
            app:layout_constraintStart_toEndOf="@+id/selected_date"
            app:layout_constraintTop_toTopOf="@+id/selected_date"
            app:layout_constraintVertical_bias="1.0" />

        <!-- Phone number-->

        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/phone_number"
            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            android:hint="@string/phone_number"
            android:orientation="vertical"
            app:endIconMode="clear_text"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/selected_date">

            <com.google.android.material.textfield.TextInputEditText
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:fontFamily="@font/roboto"
                android:inputType="phone"
                android:maxLength="11"
                android:textAppearance="@style/TextAppearance.MdcTypographyStyles.Subtitle1"
                android:typeface="normal" />

        </com.google.android.material.textfield.TextInputLayout>

        <!-- NID number-->
        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/nid_number"
            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            android:hint="@string/nid_number"
            android:orientation="vertical"
            app:endIconMode="clear_text"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/phone_number">

            <com.google.android.material.textfield.TextInputEditText
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:fontFamily="@font/roboto"
                android:inputType="number"
                android:maxLength="10"
                android:textAppearance="@style/TextAppearance.MdcTypographyStyles.Subtitle1"
                android:typeface="normal" />

        </com.google.android.material.textfield.TextInputLayout>

        <!-- Present Address-->
        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/present_address"
            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            android:hint="@string/present_address"
            android:orientation="vertical"
            app:endIconMode="clear_text"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/nid_number">

            <com.google.android.material.textfield.TextInputEditText
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:fontFamily="@font/roboto"
                android:inputType="textPostalAddress"
                android:textAppearance="@style/TextAppearance.MdcTypographyStyles.Subtitle1"
                android:typeface="normal" />

        </com.google.android.material.textfield.TextInputLayout>

        <!-- Permanent Address-->
        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/permanent_address"
            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            android:hint="@string/permanent_address"
            android:orientation="vertical"
            app:endIconMode="clear_text"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/present_address">

            <com.google.android.material.textfield.TextInputEditText
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:fontFamily="@font/roboto"
                android:inputType="textPostalAddress"
                android:textAppearance="@style/TextAppearance.MdcTypographyStyles.Subtitle1"
                android:typeface="normal" />

        </com.google.android.material.textfield.TextInputLayout>

        <!-- Submit button -->
        <com.google.android.material.button.MaterialButton
            android:id="@+id/submit_button"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            android:fontFamily="@font/roboto"
            android:text="@string/submit"
            android:textAppearance="@style/TextAppearance.MdcTypographyStyles.Button"
            android:typeface="normal"
            app:elevation="2dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/permanent_address" />


        <!--Constraint layout finish-->
    </androidx.constraintlayout.widget.ConstraintLayout>

</ScrollView>

这是AddFragment.kt的代码：


package com.example.studentinfodb.fragments.add

import android.app.DatePickerDialog
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ArrayAdapter
import android.widget.AutoCompleteTextView
import androidx.fragment.app.Fragment
import com.example.studentinfodb.R
import com.example.studentinfodb.databinding.FragmentAddBinding
import java.util.*


class AddFragment : Fragment() {

    private var _binding: FragmentAddBinding? = null
    private val binding get() = _binding!!

    override fun onCreateView(
        inflater: LayoutInflater,container: ViewGroup?,savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        _binding = FragmentAddBinding.inflate(inflater,container,false)
        val view = binding.root

        /*
        Academic school dropdown lists with array adapter
         */

        val schoolNames = listof(
            "School of Business & Economics","School of Humanities & Social " +
                    "Sciences","School of Engineering & Physical Sciences","School of Health & Life Sciences"
        )

        val schoolAdapter = ArrayAdapter(requireContext(),R.layout.school_list,schoolNames)
        (binding.schoolListDropdown.editText as? AutoCompleteTextView)?.setAdapter(schoolAdapter)


        /*
       Department names dropdown lists with array adapter
        */

        val departmentNames = listof(
            "Accounting & Finance","Economics","Management","Marketing & International Business","MBA & EMBA Programs"
        )

        val departmentAdapter =
            ArrayAdapter(requireContext(),departmentNames)
        (binding.departmentListDropdown.editText as? AutoCompleteTextView)?.setAdapter(
            departmentAdapter
        )

        /*
        Date picker for date of birth
         */




        binding.datePickerButton.setonClickListener {
            dobDatePicker()
        }

        return view
    }

    private fun dobDatePicker() {
        /*
        pick date from calender
         */
        val myCalender = Calendar.getInstance()
        val year = myCalender.get(Calendar.YEAR)
        val month = myCalender.get(Calendar.MONTH)
        val day = myCalender.get(Calendar.DAY_OF_MONTH)

        // open the dialog
        val datePicker = DatePickerDialog(
            this,DatePickerDialog.OnDateSetListener { view,selectedYear,selectedMonth,selectedDayOfMonth ->
                // date format
                val selectedDate = "$selectedDayOfMonth/ ${selectedMonth + 1}/ $selectedYear"

                // show the date in text view
                binding.selectedDate.text = selectedDate
            },year,month,day
        )
        // restriction for the future date selection
        datePicker.datePicker.maxDate = Date().time - 86400000
        // visible the date picker dialog
        datePicker.show()


    }


}

这是MainActivity.kt的代码：


package com.example.studentinfodb

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.navigation.findNavController
import androidx.navigation.ui.setupActionBarWithNavController

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
/*
Change the name of the action bar
 */
        setupActionBarWithNavController(findNavController(R.id.fragment))
    }


}

谢谢。

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