单击一次 EditText 后显示 DatePickerDialog 和 TimePickerDialog

Question

我在 AndroidViewModel 上单击 EditText 后尝试显示 DataPickerDialog 和 TimePickerDialog。

// fragment

// in TestFragment
// pass the `requireActivity().application` to TextViewModel

// viewModel

class TestViewModel(
    application: Application,
) : AndroidViewModel(application) {
    ...
    fun showDateTimeDialog() {
        val currentDateTime = Calendar.getInstance()
        val startYear = currentDateTime.get(Calendar.YEAR)
        val startMonth = currentDateTime.get(Calendar.MONTH)
        val startDay = currentDateTime.get(Calendar.DAY_OF_MONTH)
        val startHour = currentDateTime.get(Calendar.HOUR_OF_DAY)
        val startMinute = currentDateTime.get(Calendar.MINUTE)
        DatePickerDialog(getApplication(), { _, year, month, day ->
            TimePickerDialog(getApplication(), { _, hour, minute ->
                val pickedDateTime = Calendar.getInstance()
                pickedDateTime.set(year, month, day, hour, minute)
            }, startHour, startMinute, false).show()
        }, startYear, startMonth, startDay).show()
    }
}

xml（数据绑定）

        <EditText
            android:id="@+id/date_time_edit"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/add_date_time"
            android:importantForAutofill="no"
            android:ems="10"
            android:clickable="true"
            android:focusable="false"
            android:editable="false"
            android:onClick="@{() -> viewModel.showDateTimeDialog()}" />

但是当我点击这个 EditText 时，它报错显示 activity 在显示这两个对话框时消失了。

android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running?

Answer 1

原因是上下文。对话框的上下文必须是 activity，而不是应用程序。将应用程序上下文设置为对话框将导致 WindowManger$BadTokenException。

Answer 2

import android.app.Application
import androidx.lifecycle.AndroidViewModel

class TestViewModel(application: Application) : AndroidViewModel(application) {

    private val context = getApplication<Application>().applicationContext  
     ........
}

然后传递上下文

 fun showDateTimeDialog() {
        val currentDateTime = Calendar.getInstance()
        val startYear = currentDateTime.get(Calendar.YEAR)
        val startMonth = currentDateTime.get(Calendar.MONTH)
        val startDay = currentDateTime.get(Calendar.DAY_OF_MONTH)
        val startHour = currentDateTime.get(Calendar.HOUR_OF_DAY)
        val startMinute = currentDateTime.get(Calendar.MINUTE)
        DatePickerDialog(context, { _, year, month, day ->
            TimePickerDialog(context, { _, hour, minute ->
                val pickedDateTime = Calendar.getInstance()
                pickedDateTime.set(year, month, day, hour, minute)
            }, startHour, startMinute, false).show()
        }, startYear, startMonth, startDay).show()
    }
}

单击一次 EditText 后显示 DatePickerDialog 和 TimePickerDialog

Show DatePickerDialog and TimePickerDialog after one time EditText click

android

android-datepicker

android-timepicker