android：计算缓存大小并且清空缓存

  项目中碰到了计算缓存大小和清空缓存的功能，这个很常见的功能，几乎每个APP都有,以下的这个类的功能很简单，计算你的缓存总大小，不管内

部缓存还是外部缓存，和清空缓存，包括内部和外部的缓存一起清空。

public class DataCleanManager {

     

     public static String getTotalCacheSize(Context context) throws Exception {

            long cacheSize = getFolderSize(context.getCacheDir());

            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { 

                cacheSize += getFolderSize(context.getExternalCacheDir());

            } 

            return getFormatSize(cacheSize);

        }

   

   

    public static void clearAllCache(Context context) {

        deleteDir(context.getCacheDir());

        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { 

            deleteDir(context.getExternalCacheDir());

        } 

    }

   

    private static boolean deleteDir(File dir) {

        if (dir != null && dir.isDirectory()) {

            String[] children = dir.list();

            for (int i = 0; i < children.length; i++) {

                boolean success = deleteDir(new File(dir, children[i]));

                if (!success) {

                    return false;

                }

            }

        }

        return dir.delete();

    }

       

    // 获取文件 

    //Context.getExternalFilesDir() --> SDCard/Android/data/你的应用的包名/files/ 目录，一般放一些长时间保存的数据 

    //Context.getExternalCacheDir() --> SDCard/Android/data/你的应用包名/cache/目录，一般存放临时缓存数据 

    public static long getFolderSize(File file) throws Exception { 

        long size = 0; 

        try { 

            File[] fileList = file.listFiles(); 

            for (int i = 0; i < fileList.length; i++) { 

                // 如果下面还有文件 

                if (fileList[i].isDirectory()) { 

                    size = size + getFolderSize(fileList[i]); 

                } else { 

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

                } 

            } 

        } catch (Exception e) { 

            e.printStackTrace(); 

        } 

        return size; 

    } 

       

    /**

     * 格式化单位

     * 

     * @param size

     * @return

     */ 

    public static String getFormatSize(double size) { 

        double kiloByte = size / 1024; 

        if (kiloByte < 1) { 

//            return size + "Byte"; 

            return "0K";

        } 

   

        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"; 

    } 

       

       

    

}