Calculate cache size and empty cache

Project encountered in the calculation of the size of the cache and the function of emptying the cache, this very common feature, almost every app has, thought the implementation is very simple, the web search a lot of, found are not in line with my needs, and often deleted no effect, so another to find some information, toss a long time, finally completed

The following features of this class are simple, calculate the total size of your cache, regardless of the internal cache or external cache, and empty the cache, including internal and external caches together empty, please self-test, the effect of the leverage.

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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";      }                  }

When you need to check the cache size in your project, use the Gettotalcachesize (context) method, empty the cache, and use the Clearallcache (context) method

Before the online search a lot of other people write methods, query can be used, when emptying is often invalid, this invalid method is as follows:

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private static void deleteFilesByDirectory(File directory) {          if (directory != null && directory.exists() && directory.isDirectory()) {              for (File item : directory.listFiles()) {                  item.delete();              }          }      }

Calculate cache size and empty cache