当alertdialog的setcancelable为false时，无法正常工作 [英] Not working onbackpressed when setcancelable of alertdialog is false

问题描述

我有一个AlertDialog，它的setCancelable()为false.在Onbackpressed函数中，我希望AlertDialog关闭.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即可.

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
        }
    }

这篇关于当alertdialog的setcancelable为false时，无法正常工作的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！