AlertDialogBox 显示，即使从未调用过 kotlin android

Question

我正在制作一个安卓应用，并请求读取存储的权限。

这里是请求权限的代码：

private fun checkPermission():Boolean {
        return checkSelfPermission(this, READ_EXTERNAL_STORAGE) == PERMISSION_GRANTED
}

private fun toast(text: String){
    Toast.makeText(applicationContext, text, Toast.LENGTH_LONG).show()

}
private fun setupPermissions() {
    if (!checkPermission()) {
        var requestCode = 7
        requestPermissions(this, arrayOf(READ_EXTERNAL_STORAGE), requestCode)
        if (!checkPermission()) {
            toast("Permissions not granted")

            val builder = AlertDialog.Builder(this@MainActivity)
            builder.setTitle("Permissions were denied.")
            builder.setMessage("You must allow MyApp access to your files to continue.\n\nNote: If you clicked \"Don't ask again,\" you'll have to enable the permission in settings")
            builder.setPositiveButton("OK") { dialog, which ->
                setupPermissions()
            }
            builder.setNeutralButton("EXIT") { _, _ ->
                Toast.makeText(applicationContext, "You cancelled the dialog.", Toast.LENGTH_SHORT).show()
            }
            val dialog: AlertDialog = builder.create()
            dialog.show()
        }
        else{
            toast("Permissions granted")
        }
    }


}

问题是它请求权限，但你可以看到它下面的 AlertDialog 框，即使它不应该被调用：

Screenshot of app when it launches （上面写着“不要再问了”，因为我已经试过很多次了）

它似乎正在运行requestPermissions(this, arrayOf(READ_EXTERNAL_STORAGE), requestCode)，并且无需等待用户选择允许或拒绝，它就会显示对话框。

为什么会这样？感谢任何帮助，因为我是 kotlin 的新手

Answer 1

Dialog立即出现的原因是你在请求权限后检查是否创建。

第二个if (!checkPermission()) 没有任何区别，因为权限更改不会立即发生。您可以尝试以下步骤：

1. 删除代码以使您的Dialog 成为setUpPermissions()。

2. 复制并粘贴以下代码：

   @Override
   public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
       super.onRequestPermissionsResult(requestCode, permissions, grantResults);
       if (!checkPermission()) {
           toast("Permissions not granted")
   
           val builder = AlertDialog.Builder(this@MainActivity)
           builder.setTitle("Permissions were denied.")
           builder.setMessage("You must allow MyApp access to your files to continue.\n\nNote: If you clicked \"Don't ask again,\" you'll have to enable the permission in settings")
           builder.setPositiveButton("OK") { dialog, which ->
               setupPermissions()
           }
           builder.setNeutralButton("EXIT") { _, _ ->
               Toast.makeText(applicationContext, "You cancelled the dialog.", Toast.LENGTH_SHORT).show()
           }
           val dialog: AlertDialog = builder.create()
           dialog.show()
       }
       else{
           toast("Permissions granted")
       }
   }
   

这应该做的是在requestPermission()的结果发生后，它应该检查权限。然后，如果它没有被授予，它将成为Dialog。

让我知道这是否有效，或者您是否遇到任何错误，因为我没有亲自测试它。