To create an Android AlertDialog with just a single button we can make use of any one method that is provide i.e. one of setPositiveButton(), setNegativeButton() or setNeutralButton() .

AlertDialog with Single Button
Lets create an example where in we have some Information that has to be displayed to the user in a form of a Dialog, it should have a Dismiss button, when clicked the message must hide.
AlertDialog SnippetAlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Information!");
builder.setMessage("Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod\n" +
"tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,\n" +
"quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo\n" +
"consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse\n" +
"cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non\n" +
"proident, sunt in culpa qui officia deserunt mollit anim id est laborum.");
builder.setNegativeButton("Dismiss", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this,"Get Started!",Toast.LENGTH_LONG).show();
dialog.dismiss();
}
});
AlertDialog diag = builder.create();
//Display the message!
diag.show();
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