无法添加窗口--令牌null无效；是您的活动运行错误。我该怎么解决呢？

Question

我有一个登录屏幕。当用户登录时切换到HomeScreenActive。我想在活动打开时显示关于用户信息的弹出窗口消息。但是我得到一个“无法添加窗口——令牌null无效；您的活动正在运行吗？”错误。我有一个名为popup_user_information的弹出布局。我正在为这个项目使用视图绑定。我如何解决它？

package com.tcoding.instagramloginscreen

import android.annotation.SuppressLint
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.Display
import android.view.Gravity
import android.widget.PopupWindow
import android.widget.Toast
import androidx.core.hardware.display.DisplayManagerCompat
import androidx.viewpager.widget.ViewPager
import com.tcoding.instagramloginscreen.databinding.ActivityHomePageBinding
import com.tcoding.instagramloginscreen.databinding.PopupUserInformationBinding

class HomePageActivity : AppCompatActivity() {

    lateinit var binding: ActivityHomePageBinding
    lateinit var bindingPopup: PopupUserInformationBinding


    @SuppressLint("SetTextI18n")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityHomePageBinding.inflate(layoutInflater)
        setContentView(binding.root)

        val username = intent.getStringExtra("username")
        val password = intent.getStringExtra("password")
        binding.tvUsername.text = binding.tvUsername.text.toString() + username
        binding.tvPassword.text = binding.tvPassword.text.toString() + password

        binding.btnExit.setOnClickListener{
            val intent = Intent(this, MainActivity::class.java)
            intent.putExtra("username", username)
            intent.putExtra("password", password)
            setResult(RESULT_OK)
            finish()

        }

        popUp()


    }


    fun popUp()
    {
        val username = intent.getStringExtra("username")
        val password = intent.getStringExtra("password")
        bindingPopup = PopupUserInformationBinding.inflate(layoutInflater)
        val popup = PopupWindow(bindingPopup.root, ViewPager.LayoutParams.MATCH_PARENT, ViewPager.LayoutParams.WRAP_CONTENT)


        popup.showAtLocation(bindingPopup.root, Gravity.BOTTOM, 0,0)

        bindingPopup.usernameInfo.text = username
        bindingPopup.passwordInfo.setText(password)

        bindingPopup.btnKaydet.setOnClickListener {
            Toast.makeText(this,"Clicked save",Toast.LENGTH_SHORT).show()
            popup.dismiss()
        }
        bindingPopup.btnNotnow.setOnClickListener {
            Toast.makeText(this,"Clicked Not now",Toast.LENGTH_SHORT).show()
            popup.dismiss()
        }
    }
}

Answer 1

您试图过早显示弹出窗口。OnCreate上的视图尚未创建，请尝试将弹出窗口（）移动到OnViewCreated（）上

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    popup()
}

或者使用视图。post，使其进入主线程队列，并在其他挂起任务完成后执行

override fun onCreate(savedInstanceState: Bundle?) {
   ...
   binding.root.post {
     popup() 
   }
}