Java tutorial
//package com.java2s; import android.app.Activity; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; public class Main { public static void displayAlert(Context context, String title, String message, String buttonText) { if (null == context || !(context instanceof Activity)) { return; } final Activity activity = (Activity) context; AlertDialog alertDialog = new AlertDialog.Builder(activity) .setPositiveButton(buttonText, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.cancel(); } }).setTitle(title).setMessage(message).create(); if (!activity.isFinishing()) { alertDialog.show(); } } }