AlertDialog

JAVA

//Single Button
AlertDialog.Builder alertDialog = new AlertDialog.Builder(DialogActivity.this);
alertDialog.setTitle("Terms & Condition");
alertDialog.setIcon(R.drawable.info);
alertDialog.setMessage("Have you read all T & C");

alertDialog.setNegativeButton("Yes", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {

        dialog.dismiss();

    }
});

alertDialog.show();

//Two Buttons
AlertDialog.Builder delete = new AlertDialog.Builder(DialogActivity.this);
delete.setTitle("Delete");
delete.setIcon(R.drawable.info);
delete.setMessage("Do you really want to delete this?");

delete.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {

        Toast.makeText(DialogActivity.this, "Item Deleted", Toast.LENGTH_SHORT).show();
    }
});

delete.setNegativeButton("NO", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {

        Toast.makeText(DialogActivity.this, "Item not deleted", Toast.LENGTH_SHORT).show();
    }
});

delete.show();

//Three Buttons
AlertDialog.Builder exitdialog = new AlertDialog.Builder(DialogActivity.this);
exitdialog.setTitle("Exit");
exitdialog.setIcon(R.drawable.info);
exitdialog.setMessage("Do you really want to exit?");

exitdialog.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        finishAffinity();
    }
});

exitdialog.setNegativeButton("NO", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {

        Toast.makeText(DialogActivity.this, "You selected No", Toast.LENGTH_SHORT).show();

    }
});

exitdialog.setNeutralButton("cancel", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        Toast.makeText(DialogActivity.this, "cancelled", Toast.LENGTH_SHORT).show();
    }
});

exitdialog.show();

OUTPUT