Dialog in Android.

Dialogs

Dialog is small window that show the message user related information or it takes some additional information  from user.

The Dialog  class is the base class for dialogs, but you should avoid instantiating Dialog directly instead, use one of the following subclasses.

AlertDialog

Alert Dialog is generally use for showing alert message to user. We can set different buttons for get the confirmation of user.

Alert dialog has three parts :

1. Title : It is optional part. Title is the upper part of the Dialog.

2. Content :This Displays the message to user. It can be string or Custom Layout.


3. Action Buttons : Action Buttons are three Types. They are Positive, Negative and Neutral action buttons. If user accept the action, Use positive Button. It is normally displayed as OK/YES. If the user Reject   the action, It is normally  displayed as NO. If the user postpone the action, It is normally displayed as LATER/CANCEL.

How to show Alert dialog in Android

	// Initilize Alert Dialog AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(MainActivity.this); //set title alertDialogBuilder.setTitle("Your Title");
	// set dialog message
	alertDialogBuilder
	.setMessage("Click yes to exit!")
	.setCancelable(false)
	.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
	public void onClick(DialogInterface dialog, int id) {
	// if this button is clicked, close
	// current activity
	MainActivity.this.finish();
	}
	})
	.setNegativeButton("No", new DialogInterface.OnClickListener() {
	public void onClick(DialogInterface dialog, int id) {
	// if this button is clicked, just close
	// the dialog box and do nothing
	dialog.cancel();
	}
	});
	// create alert dialog
	AlertDialog alertDialog = alertDialogBuilder.create();
	// show it
	alertDialog.show();

  AlertDialog   with one Button in Android 

	AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(MainActivity.this);
	// Setting Dialog Title
	alertDialogBuilder.setTitle("Alert Dialog");
	// Setting Dialog Message
	alertDialogBuilder.setMessage("Alert Dialog with One Button!!");
	// Setting OK Button
	alertDialogBuilder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
	public void onClick(DialogInterface dialog, int id) {
	Toast.makeText(getApplicationContext(), "You clicked on OK", Toast.LENGTH_SHORT).show();
	}
	});
	// Showing Alert Message
	alertDialogBuilder.show();

AlertDialog with two Button

	AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(MainActivity.this);
	// Setting Dialog Title
	alertDialogBuilder.setTitle("Alert Dialog");
	// Setting Dialog Message
	alertDialogBuilder.setMessage("Alert Dialog with Two Button!!");
	// Setting positive OK Button
	alertDialogBuilder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
	public void onClick(DialogInterface dialog, int id) {
	Toast.makeText(getApplicationContext(), "You clicked on OK", Toast.LENGTH_SHORT).show();
	}
	});
	// Setting Negative "NO" Button
	alertDialogBuilder.setNegativeButton("NO", new DialogInterface.OnClickListener() {
	public void onClick(DialogInterface dialog, int which) {
	// Write your code here to invoke NO event
	Toast.makeText(getApplicationContext(), "You clicked on NO", Toast.LENGTH_SHORT).show();
	dialog.cancel();
	}
	});
	// Showing Alert Message
	alertDialogBuilder.show();

AlertDialog with Three Buttons 

	AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(MainActivity.this);
	// Setting Dialog Title
	alertDialogBuilder.setTitle("Alert Dialog");
	// Setting Dialog Message
	alertDialogBuilder.setMessage("Alert Dialog with Two Button!!");
	// Setting positive OK Button
	alertDialogBuilder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
	public void onClick(DialogInterface dialog, int id) {
	Toast.makeText(getApplicationContext(), "You clicked on OK", Toast.LENGTH_SHORT).show();
	}
	});
	// Setting Negative "NO" Button
	alertDialogBuilder.setNegativeButton("NO", new DialogInterface.OnClickListener() {
	public void onClick(DialogInterface dialog, int which) {
	// Write your code here to invoke NO event
	Toast.makeText(getApplicationContext(), "You clicked on NO", Toast.LENGTH_SHORT).show();
	dialog.cancel();
	}
	});
	// Setting Netural "Cancel" Button
	alertDialogBuilder.setNeutralButton("Cancel", new DialogInterface.OnClickListener() {
	public void onClick(DialogInterface dialog, int which) {
	// User pressed Cancel button. Write Logic Here
	Toast.makeText(getApplicationContext(), "You clicked on Cancel",
	Toast.LENGTH_SHORT).show();
	}
	});
	// Showing Alert Message
	alertDialogBuilder.show(); Download the project from Github

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