android 一些常用的功能方法代碼塊

我們這些苦逼的程序員在工作中，我們的每一個老板都希望我們都能把手頭的工作做好的，而且是越快越好，那我們要怎麼樣才起來呢？對於常用的代碼塊無限復做是我們工作中簡省時間最有效的途徑之一，而下面的這些代碼就是我們在開發出現概率較多的，www.androidkaifa.com就為大家歸納了一部分開發中常用的代碼塊：

一 隱藏軟鍵盤的輸入法
     InputMethodManager mInputMethodManager = (InputMethodManager) context
                        .getSystemService(Context.INPUT_METHOD_SERVICE);
                mInputMethodManager.hideSoftInputFromWindow(view.getWindowToken(), 0); 二：判斷網絡是否是好的        public static boolean isActiveNetwork(Context context) {
            ConnectivityManager cManager = (ConnectivityManager) context
                    .getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo netInfor = cManager.getActiveNetworkInfo();
            if (netInfor != null && netInfor.isAvailable()) {
                return true;
            } else {
                return false;
            } www.2cto.com
        }三數據單位的轉換        /**
         * 轉化B到KB
         */
        public static double transB2KB(long b) {
            return b / 1024;
        }

        /**
         * 轉化B到KB
         */
        public static double transKB2M(double KB) {
            return KB / 1024;
        }
四  確保文件目錄存在
     public static void checkFileDirectory(String path) {
        if (path != null) {
            File filePath = new File(path);
            if (!filePath.exists()) {
                filePath.mkdirs();
            }
        }
    }
五：獲取網絡文件的總大小
    public static Long getTotalSize(String url) {
        Long totalSize = null;
        try {
            totalSize = NetworkUtil.getContentSize(url);
        } catch (Exception e) {
            totalSize = 0L;
            e.printStackTrace();
        }
        return totalSize;
    }
六：顯示網絡異常的提示
    public static void showNetException(Context context) {
        Toast.makeText(context,
                context.getApplicationContext().getResources().getString(R.string.net_exception),
                Toast.LENGTH_SHORT).show();
    }
七：java將天數轉換為毫秒數
    public static long transDayToTime(long datCount) {
        long time = datCount * 24 * 60 * 60 * 1000;
        return time;
    }
八：java 將毫秒數轉換為天數
    public static int transTimeToDay(long time) {
        int day = (int) (time / (24 * 60 * 60 * 1000));
        return day;
    }
九：android判斷應用是否是內置的
    public static boolean isSystemApplication(Context context, String packageName) {
        boolean isflag = false;
        try {
            PackageManager pm = context.getPackageManager();
            ApplicationInfo pInfo = pm
                    .getApplicationInfo(packageName, PackageManager.GET_META_DATA);
            if ((pInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
                isflag = true;
            }
        } catch (Exception e) {
            Log.i("xxxxx","Exception ");
        }
        return isflag;
    }
十：判斷字符串是否為空
    public static boolean isNull(String string) {
        if (string != null) {
            string = string.trim();
            if (string.length() != 0) {
                return false;
            }
        }
        return true;
    }