如何在异步任务的android应用中添加互联网连接问题对话框

<uses-permission android:name="android.permission.INTERNET" />

ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
boolean isConnected = networkInfo != null && networkInfo.isConnected();

AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("网络连接问题");
builder.setMessage("请检查您的网络连接");
builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        // 用户点击确定按钮后的操作
    }
});
builder.setCancelable(false); // 设置对话框不可取消
AlertDialog dialog = builder.create();
dialog.show();