很多地方會用到Toast提示，寫一個全局的自定義提示類會方便很多

public class ToastUtil {

    private static Toast sToast = null;

    /**
     * 只顯示一次短的Toast
     */
    public static void showSingleShort(Context context, CharSequence text) {
        if (sToast == null) {
            sToast = Toast.makeText(context, text, Toast.LENGTH_SHORT);
        } else {
            sToast.setText(text);
            sToast.setDuration(Toast.LENGTH_SHORT);
        }
        sToast.show();
    }
    /**
     * 只顯示一次長的Toast
     */
    public static void showSingleLong(Context context, CharSequence text) {
        if (sToast == null) {
            sToast = Toast.makeText(context, text, Toast.LENGTH_LONG);
        } else {
            sToast.setText(text);
            sToast.setDuration(Toast.LENGTH_LONG);
        }
        sToast.show();
    }

    private ToastUtil() {
        /* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");
    }

    public static boolean isShow = true;

    /**
     * 短時間顯示Toast
     *
     * @param context
     * @param message
     */
    public static void showShort(Context context, CharSequence message) {
        if (isShow)
            Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
    }

    /**
     * 短時間顯示Toast
     *
     * @param message
     */
    public static void showShort( CharSequence message) {
        if (isShow)
            Toast.makeText(SimpleUtils.getContext(), message, Toast.LENGTH_SHORT).show();
    }

    /**
     * 短時間顯示Toast
     *
     * @param context
     * @param message
     */
    public static void showShort(Context context, int message) {
        if (isShow)
            Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
    }

    /**
     * 長時間顯示Toast
     *
     * @param context
     * @param message
     */
    public static void showLong(Context context, CharSequence message) {
        if (isShow)
            Toast.makeText(context, message, Toast.LENGTH_LONG).show();
    }

    /**
     * 長時間顯示Toast
     *
     * @param context
     * @param message
     */
    public static void showLong(Context context, int message) {
        if (isShow)
            Toast.makeText(context, message, Toast.LENGTH_LONG).show();
    }

    /**
     * 自定義顯示Toast時間
     *
     * @param context
     * @param message
     * @param duration
     */
    public static void show(Context context, CharSequence message, int duration) {
        if (isShow)
            Toast.makeText(context, message, duration).show();
    }

    /**
     * 自定義顯示Toast時間
     *
     * @param context
     * @param message
     * @param duration
     */
    public static void show(Context context, int message, int duration) {
        if (isShow)
            Toast.makeText(context, message, duration).show();
    }

}