Android常用的工具方法(4)

1. 检测网络是否可用

   /**
     * 检测网络是否可用
     *
     * @param context
     * @return
     */
    public static boolean isNetWorkConnected(Context context) {
        if (context != null) {
            ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();
            if (mNetworkInfo != null) {
                return mNetworkInfo.isAvailable();
            }
        }
        return false;
    }

2.检测Sdcard是否存在

/**
     * 检测Sdcard是否存在
     *
     * @return
     */
    public static boolean isExitsSdcard() {
        if (android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED))
            return true;
        else
            return false;
    }

1. 获取文件夹大小

/**
     * 获取文件夹大小
     * 
     * @param file
     *            File实例
     * @return long
     */
    public static long getFolderSize(File file) {
        long size = 0;
        if (file.exists()) {

            try {
                File[] fileList = file.listFiles();
                for (int i = 0; i < fileList.length; i++) {
                    if (fileList[i].isDirectory()) {
                        size = size + getFolderSize(fileList[i]);

                    } else {
                        size = size + fileList[i].length();

                    }
                }
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return size;
    }

4.删除指定目录下文件及目录

    /**
     * 删除指定目录下文件及目录
     * 
     * @param deleteThisPath
     * @param filepath
     * @return
     */
    public void deleteFolderFile(String filePath, boolean deleteThisPath) {
        if (!TextUtils.isEmpty(filePath)) {
            try {
                File file = new File(filePath);
                if (file.isDirectory()) {// 处理目录
                    File files[] = file.listFiles();
                    for (int i = 0; i < files.length; i++) {
                        deleteFolderFile(files[i].getAbsolutePath(), true);
                    }
                }
                if (deleteThisPath) {
                    if (!file.isDirectory()) {// 如果是文件，删除
                        file.delete();
                    } else {// 目录
                        if (file.listFiles().length == 0) {// 目录下没有文件或者目录，删除
                            file.delete();
                        }
                    }
                }
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

5.对文件大小进行格式化

/**
     * 格式化单位
     * 
     * @param size
     * @return
     */
    public static String getFormatSize(double size) {
        double kiloByte = size / 1024;
        if (kiloByte < 1) {
            return size + "B";
        }

        double megaByte = kiloByte / 1024;
        if (megaByte < 1) {
            BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));
            return result1.setScale(2, BigDecimal.ROUND_HALF_UP)
                    .toPlainString() + "KB";
        }

        double gigaByte = megaByte / 1024;
        if (gigaByte < 1) {
            BigDecimal result2 = new BigDecimal(Double.toString(megaByte));
            return result2.setScale(2, BigDecimal.ROUND_HALF_UP)
                    .toPlainString() + "MB";
        }

        double teraBytes = gigaByte / 1024;
        if (teraBytes < 1) {
            BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));
            return result3.setScale(2, BigDecimal.ROUND_HALF_UP)
                    .toPlainString() + "GB";
        }
        BigDecimal result4 = new BigDecimal(teraBytes);
        return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString()
                + "TB";
    }

6.创建资源文件

    /**
     * 创建资源文件
     * @param fileName
     * @return
     */
     public File createSDFile(String fileName){
         File file=new File(fileName);
         try {
             file.createNewFile();
         } catch (IOException e) {
             e.printStackTrace();
       }
         return file;
     }

7.进行写文件操作

    /**
     * 进行写文件操作
     * @param fileName
     * @param inputStream
     * @return
     */
     public File writeToSDfromInput(String fileName,InputStream inputStream){
         //createSDDir(path);
         File file=createSDFile(fileName);
         OutputStream outStream=null;
         try {
             outStream=new FileOutputStream(file);
             byte[] buffer = new byte[8192];                 
              int count;
              while ((count = inputStream.read(buffer))> 0){
                  outStream.write(buffer, 0, count);
              }
              outStream.close();
                 inputStream.close();
//             outStream.flush();
         } catch (FileNotFoundException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }finally{
             try {
                 outStream.close();
                 inputStream.close();
             } catch (IOException e) {
                 e.printStackTrace();
            }
         }
         return file;
     }

8.进行写文件操作

/**
     * 进行写文件操作
     * @param fileName
     * @param data
     * @return
     */
    public File operaFileData(String fileName, byte[]  data) {
        {
            FileOutputStream fileout = null;
            File file = new File(fileName);
            if (file.exists()) {
                file.delete();
            }
            try {
                fileout = new FileOutputStream(file);
                fileout.write(data, 0, data.length);

            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    fileout.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            return file;
        }

    }