当 alertdialog 的 setcancelable 为 false 时，无法在 backpressed 上工作

Question

我有一个 AlertDialog，它的 setCancelable() 是错误的。在 Onbackpressed 函数中，我希望关闭 AlertDialog。但是当setCancelable()为false时，返回键根本不起作用。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。

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()
    }
}

Answer 1

dialogBuilder.setOnKeyListener(object : OnKeyListener() {
            fun onKey(dialog: DialogInterface, keyCode: Int, event: KeyEvent?): Boolean {
                if (keyCode == KeyEvent.KEYCODE_BACK) {
//if you want to cancel the dialog only
                    dialog.cancel()
                    //if you want to finish then 
                   // finish()
                }
                return true
            }
        })

Answer 2

解决此问题的最简单方法是设置 OnKeyListener 并在用户点击后退按钮时自动检测。

Java:

public Dialog onCreateDialog(Bundle savedInstanceState) {

  Dialog dialog = super.onCreateDialog(savedInstanceState);

  dialog.setOnKeyListener(new Dialog.OnKeyListener() {
    @Override
    public boolean onKey(DialogInterface dialogInterface, int keyCode, KeyEvent keyEvent) {
        if (keyCode == KeyEvent.KEYCODE_BACK && keyEvent.getAction() == KeyEvent.ACTION_UP) {
          dialog.cancel;
          return true;
        }
        return false;
    }
  });

  return dialog;
}

科特林：

    dialog = AlertDialog.Builder(this)
            .setCancelable(false)
            .create()
    dialog.show()

    dialog.setOnKeyListener (object : Dialog.OnKeyListener { 
      override fun onKey(dialogInterface: DialogInterface, keyCode: Int, keyEvent: KeyEvent) {
        if(keyCode == KeyEvent.KEYCODE_BACK and keyEvent.action == KeyEvent.ACTION_UP) {
            dialog.dismiss()
            true
        }
        false
      }})

请注意，我在 if 语句中添加了一个额外的条件，所有这些都是为了确保它不会触发两次。

希望对您有所帮助。

Answer 3

只需添加一个 onKeyListener 并在返回键事件上取消对话框。

    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
        }
    }

Answer 4

如果您不想在触摸对话框的外部区域时关闭对话框，您可以设置属性

    permissionDialog.setCanceledOnTouchOutside(false)

如果您想在 backpress 时关闭对话框，您需要调用 keyListener 上的方法

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

Answer 5

正如我所见，您创建的 dialogBuilder 是 public 为什么不在 public alertDialog 中调用它，然后使用 alertDilog.show() 显示它，然后在 [= 中按下 pressClick 关闭15=] 并关闭对话框 alertDilog.dismiss() 覆盖 onBackPress 并在此处关闭它

val alertDialog:AlertDialog?=null


         alertDialog = new AlertDialog.Builder(this)
        //set icon 
        .setIcon(android.R.drawable.ic_dialog_alert)
        //set title
        .setTitle("Are you sure to Exit")
        //set message
        .setMessage("Exiting will call finish() method")
        //set positive button
        .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {
        //set what would happen when positive button is clicked    
            finish();
        }
        })
        //set negative button
        .setNegativeButton("No", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {
        //set what should happen when negative button is clicked
            Toast.makeText(getApplicationContext(),"Nothing 
          Happened",Toast.LENGTH_LONG).show();
         }
        })
        .show();

       onBackPress(){alertDialog.dismiss()}

当 alertdialog 的 setcancelable 为 false 时，无法在 backpressed 上工作

Not working onbackpressed when setcancelable of alertdialog is false

android

back

android-alertdialog

kotlin

onbackpressed