fragment中弹出窗口的下拉旋转器一直导致应用崩溃

Question

我在地图片段内创建一个过滤器，因此我需要一个弹出窗口，用户可以在其中设置过滤器。在弹出窗口中，我想添加一个下拉微调器，但每次我点击微调器，应用程序崩溃，我得到这个错误:

2021-02-18 15:13:58.162 31233-31233/com.example.discoverme E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.discoverme, PID: 31233
android.view.WindowManager$BadTokenException: Unable to add window -- token android.view.ViewRootImpl$WEx@6667b18 is not valid; is your activity running?
at android.view.ViewRootImpl.setView(ViewRootImpl.java:702)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:342)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:94)
at android.widget.PopupWindow.invokePopup(PopupWindow.java:1391)
at android.widget.PopupWindow.showAsDropDown(PopupWindow.java:1247)
at androidx.appcompat.widget.AppCompatPopupWindow.showAsDropDown(AppCompatPopupWindow.java:77)
at androidx.core.widget.PopupWindowCompat.showAsDropDown(PopupWindowCompat.java:69)
at androidx.appcompat.widget.ListPopupWindow.show(ListPopupWindow.java:754)
at androidx.appcompat.widget.AppCompatSpinner$DropdownPopup.show(AppCompatSpinner.java:1050)
at androidx.appcompat.widget.AppCompatSpinner.showPopup(AppCompatSpinner.java:608)
at androidx.appcompat.widget.AppCompatSpinner.performClick(AppCompatSpinner.java:452)
at android.view.View$PerformClick.run(View.java:22433)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6247)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:872)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:762)

有人知道如何解决这个问题吗?

我调用PopUp类在我的地图片段onCreate函数如下:

val popupButton : Button= rootView.findViewById(R.id.filter_button);
popupButton.setOnClickListener { v ->
val popUpClass = PopUpClass()
popUpClass.showPopupWindow(v)
}

，这是弹出窗口类:

import android.annotation.SuppressLint
import android.content.Context
import android.view.Gravity
import android.view.LayoutInflater
import android.view.View
import android.widget.*
import androidx.appcompat.app.AppCompatActivity
import com.google.android.material.internal.ViewUtils.getContentView
import com.google.android.material.slider.RangeSlider

class PopUpClass {
//PopupWindow display method
@SuppressLint("ClickableViewAccessibility", "RestrictedApi", "InflateParams")
fun showPopupWindow(view: View) {

//Create a View object yourself through inflater
val inflater =
view.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
val popupView: View = inflater.inflate(R.layout.popup_layout, null)
//val slider: RangeSlider = popupView.findViewById(R.id.slider)
//slider.setValues(1.0f, 5.0f)
val spinner: Spinner = popupView.findViewById(R.id.filter_spinner)
getContentView(spinner)?.let {
ArrayAdapter.createFromResource(
it.getContext(),
R.array.auswahl_filter,
android.R.layout.simple_spinner_item
).also {  adapter ->
// Specify the layout to use when the list of choices appears
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
// Apply the adapter to the spinner
spinner.adapter = adapter
spinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
override fun onItemSelected(
parent: AdapterView<*>?,
view: View?,
position: Int,
id: Long
) {
val selectedItem = parent?.getItemAtPosition(position).toString()
}
override fun onNothingSelected(parent: AdapterView<*>?) {
}
}
}
}

//Specify the length and width through constants
val width = LinearLayout.LayoutParams.MATCH_PARENT
val height = LinearLayout.LayoutParams.MATCH_PARENT
//Make Inactive Items Outside Of PopupWindow
val focusable = true
//Create a window with our parameters
val popupWindow = PopupWindow(popupView, width, height, focusable)
//Set the location of the window on the screen
popupWindow.showAtLocation(view, Gravity.CENTER, 0, 0)
//Initialize the elements of our window, install the handler
val test2 = popupView.findViewById<TextView>(R.id.titleText)
//test2.setText(R.string.textTitle)
val buttonEdit = popupView.findViewById<Button>(R.id.messageButton)
buttonEdit.setOnClickListener { //As an example, display the message
Toast.makeText(view.context, "Wow, popup action button", Toast.LENGTH_SHORT).show()
}

//Handler for clicking on the inactive zone of the window
popupView.setOnTouchListener { v, event -> //Close the window when clicked
popupWindow.dismiss()
true
}
}
}

，这是popUp.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"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:gravity="center">
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:cardCornerRadius="5dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="10dp">
<TextView
android:id="@+id/titleText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:padding="10dp"
android:text="Bearbeite deine Suche"
android:textSize="20sp"
android:textStyle="bold" />
<Spinner
android:id="@+id/filter_spinner"
android:layout_width="match_parent"
android:layout_height="51dp"
android:layout_marginTop="20dp"
android:spinnerMode="dropdown"/>

<Button
android:id="@+id/messageButton"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:layout_marginTop="80dp"
android:text="Filter anwenden" />
</LinearLayout>
</androidx.cardview.widget.CardView>
</LinearLayout>

Answer 1

因此，我通过将getContentView(spinner)?更改为getConentView(view)?并将android:spinnerMode="dialog"添加到我的xml中的旋转器来修复此问题。