1. 程式人生 > >Android開發:計算快取大小並且清空快取

Android開發:計算快取大小並且清空快取

專案中碰到了計算快取大小和清空快取的功能,這個很常見的功能,幾乎每個APP都有,以為實現很簡單,網上搜了一大堆,發現都不是符合我需要的,而且經常刪除的沒有效果,於是又另外找了一些資料,折騰了蠻久,終於完成了

以下的這個類的功能很簡單,計算你的快取總大小,不管內部快取還是外部快取,和清空快取,包括內部和外部的快取一起清空,請本人親測,效果槓槓的。

 

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 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();      }              // 獲取檔案       //Context.getExternalFilesDir() --> SDCard/Android/data/你的應用的包名/files/ 目錄,一般放一些長時間儲存的資料       //Context.getExternalCacheDir() --> SDCard/Android/data/你的應用包名/cache/目錄,一般存放臨時快取資料       public static long getFolderSize(File file) throws Exception {           long size = 0          try              File[] fileList = file.listFiles();               for ( int i = 0 ; i < fileList.length; i++) {                   // 如果下面還有檔案                   if (fileList[i].isDirectory()) {                       size = size + getFolderSize(fileList[i]);                   } else                      size = size + fileList[i].length();                                         } catch (Exception e) {               e.printStackTrace();                    return size;                    /**       * 格式化單位             * @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"                           }

 

 

當你在專案中需要查下快取大小,就使用getTotalCacheSize(Context)方法,清空快取,就使用clearAllCache(Context)方法