Android计算缓存大小、清空缓存

这个管理类是在网上搜到的，还没有使用和验证，没有找到出处，权当备忘。

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";      }  }

当你在项目中需要查下缓存大小，就使用getTotalCacheSize(Context)方法，清空缓存，就使用clearAllCache(Context)方法。

更多相关文章

随机推荐