单击按钮时,如何在按钮上创建警报对话框?

我正在尝试开发一个小应用程序作为考试的一部分。基本上,我有一个指向网页的按钮,我希望在单击按钮时和网页打开之前弹出一个警报对话框。这就是我目前的情况:

主要活动: 公共类MainActivity扩展了AppCompatActivity{

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    ButterKnife.bind(this);
    webViewAndroidWeekly();

}


private void webViewAndroidWeekly (){
    Button btnWebpage = findViewById(R.id.btnwebpage);
    btnWebpage.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent();
            intent.setAction(Intent.ACTION_VIEW);
            intent.addCategory(Intent.CATEGORY_BROWSABLE);
            intent.setData(Uri.parse("http://androidweekly.net/"));
            startActivity(intent);
        }
    });
}



@Override
protected void onStop() {
    super.onStop();
    Toast.makeText(this, "Thank you for using this app! :)", Toast.LENGTH_SHORT).show();
    finish();
}

}

该按钮起作用并打开网页,以便设置部件。我为警报对话框创建了一个单独的java类,并试图实现它,但我无法理解。

对话框类:

公共类InternetWarningDialog扩展了DialogFragment{

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setIconAttribute(android.R.attr.alertDialogIcon);
    builder.setTitle("Go to WebPage");
    builder.setMessage("Are you sure you want to proceed to webpage? This may incur additional charges based on your mobile data plan!");
    builder.setCancelable(false);

    builder.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {
            getActivity().finish();
        }
    });

    builder.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {
        }
    });

    AlertDialog alertDialog = builder.create();
    return alertDialog;
}

}