AlertDialogBox 显示即使从未调用 kotlin android

Question

我正在制作一个 android 应用程序，并请求读取存储空间的权限。

这是请求权限的代码：

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 （它说 "Don't ask again" 因为我试过很多次了）

好像是运行requestPermissions(this, arrayOf(READ_EXTERNAL_STORAGE), requestCode)，没等用户select允许或拒绝，就显示了对话框。

为什么会这样？感谢任何帮助，因为我是 kotlin

的新手

Answer 1

之所以马上出现Dialog是因为你申请权限后正在检查是否创建

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

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

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，如果没有被授予，它将使 Dialog.

让我知道这是否有效，或者如果您运行遇到任何错误，因为我没有亲自测试它。

AlertDialogBox 显示即使从未调用 kotlin android

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android

android-alertdialog

kotlin

android-permissions