当 alertdialog 的 setcancelable 为 false 时，无法正常工作

问题描述

我有一个 AlertDialog，它的 setCancelable() 是假的.在 Onbackpressed 函数中，我希望关闭 AlertDialog.但是当 setCancelable() 为 false 时，后退键根本不起作用.我应该怎么做才能摆脱这个问题?我不想将 setCancelable() 更改为 true，因为我会遇到另一个问题.

I have an AlertDialog and its setCancelable() is false. In Onbackpressed function I want the AlertDialog to be closed. But when setCancelable() is false, the back key doesn't work at all. What should I do to get rid of this problem? I don't want to change setCancelable() to true because I will have another problem.

import android.os.Bundle
import android.widget.Toast
import androidx.appcompat.app.AlertDialog
import androidx.appcompat.app.AppCompatActivity

class MainActivity : AppCompatActivity() {
    lateinit var dialogBuilder: AlertDialog.Builder
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        dialogBuilder = AlertDialog.Builder(this)
        dialogBuilder.setMessage("Check your internet connection")
            .setPositiveButton("OK") { _, _ ->
                Toast.makeText(this, "OK", Toast.LENGTH_LONG).show()
            }.setCancelable(false)
            .create().show()
    }
}

推荐答案

只需添加一个 onKeyListener 并取消返回键事件的对话框.

just add a onKeyListener and cancel dialog on back key event.

    lateinit var dialog: AlertDialog

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        dialog = AlertDialog.Builder(this).setMessage("Check your internet connection")
                .setPositiveButton("OK") { _, _ ->
                    Toast.makeText(this, "OK", Toast.LENGTH_LONG).show()
                }.setCancelable(false)
                .create()
        dialog.show()

        dialog.setOnKeyListener { _, keyCode, _ ->
            if(keyCode == KeyEvent.KEYCODE_BACK) {
                if(dialog.isShowing) {
                    dialog.dismiss()
                }
            }
            true
        }
    }

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