Show Alert Dialog

public void Showalert(String msg){
AlertDialog.Builder alt_bld = new AlertDialog.Builder(this);
alt_bld.setMessage(msg)
.setCancelable(false).setNegativeButton("OK",
new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog,
int id) {
dialog.cancel();
}
});

AlertDialog alert = alt_bld.create();
alert.setTitle("Alert");
alert.show();
}