阻止重复吐司并可控制位置

public class ToastUtil {
    private static String oldMsg;
    protected static Toast toast = null;
    private static long oneTime = 0;
    private static long twoTime = 0;

    public static void showToast(Context context, int resId) {
        showToast(context.getApplicationContext(), context.getApplicationContext().getString(resId));
    }

    public static void showToast(Context context, int resId, int gravity) {
        showToast(context.getApplicationContext(), context.getApplicationContext().getString(resId), gravity, 0, 0);
    }

    public static void showToast(Context context, String s, int gravity) {
        showToast(context.getApplicationContext(), s, gravity, 0, 0);
    }

    public static void showToast(Context context, int resId, int gravity, int offX, int offY) {
        showToast(context.getApplicationContext(), context.getApplicationContext().getString(resId), gravity, offX, offY);
    }

    public static void showToast(Context context, String s) {
        if (toast == null) {
            toast = Toast.makeText(context.getApplicationContext(), s, Toast.LENGTH_SHORT);

            toast.show();
            oneTime = System.currentTimeMillis();
        } else {
            twoTime = System.currentTimeMillis();
            if (s.equals(oldMsg)) {
                if (twoTime - oneTime > Toast.LENGTH_SHORT) {
                    toast.show();
                }
            } else {
                oldMsg = s;
                toast.setText(s);
                toast.show();
            }
        }
        oneTime = twoTime;
    }


    public static void showToast(Context context, String s, int gravity, int offX, int offY) {
        if (toast == null) {
            toast = Toast.makeText(context.getApplicationContext(), s, Toast.LENGTH_SHORT);
            toast.setGravity(gravity, offX, offY);
            toast.show();
            oneTime = System.currentTimeMillis();
        } else {
            twoTime = System.currentTimeMillis();
            if (s.equals(oldMsg)) {
                if (twoTime - oneTime > Toast.LENGTH_SHORT) {
                    toast.show();
                }
            } else {
                oldMsg = s;
                toast.setText(s);
                toast.show();
            }
        }
        oneTime = twoTime;
    }
}