Alert Dialog in Android

A Dialog is small window that prompts the user to a decision or enter additional information.The AlertDialog class allows you to build a variety of dialog designs and is often the only dialog class you'll need.

1. Title This is optional and should be used only when the content area is occupied by a detailed message, a list, or custom layout. If you need to state a simple message or question you don't need a title.
2. Content area This can display a message, a list, or other custom layout.
3. Action buttons There should be no more than three action buttons in a dialog.
   
   for details click here
   
   Example :
    
   

   AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
         alertDialogBuilder.setMessage("Are you sure,
            You want to exit");
         alertDialogBuilder.setPositiveButton("yes", 
            new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface arg0, int arg1) {
               Toast.makeText(context,"You clicked yes 
                  button",Toast.LENGTH_LONG).show();
            }
         });
   
         alertDialogBuilder.setNegativeButton("No",new DialogInterface.OnClickListener() {
            Override
            public void onClick(DialogInterface dialog, int which) {
               finish();
            }
         });
   
         AlertDialog alertDialog = alertDialogBuilder.create();
         alertDialog.show();

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