public class CommUtils {
private static Toast toast = null;
public static void showToast(int text) {
if (toast == null) {
toast = Toast.makeText(NetApplication.getInstance()
.getApplicationContext(), text, Toast.LENGTH_SHORT);
} else {
toast.setText(text);
}
toast.show();
}
｝
原文：http://www.cnblogs.com/gavanwanggw/p/6718462.html