使用缓存问题-创新互联

public class CacheManager {

   private static final long MAX_SIZE = 5242880L; // 5MB

   private CacheManager() {

   }

   public static void cacheData(Context context, byte[] data, String name) throws IOException {

       File cacheDir = context.getCacheDir();
       long size = getDirSize(cacheDir);
       long newSize = data.length + size;

       if (newSize > MAX_SIZE) {
           cleanDir(cacheDir, newSize - MAX_SIZE);
       }

       File file = new File(cacheDir, name);
       FileOutputStream os = new FileOutputStream(file);
       try {
           os.write(data);
       }
       finally {
           os.flush();
           os.close();
       }
   }

   public static byte[] retrieveData(Context context, String name) throws IOException {

       File cacheDir = context.getCacheDir();
       File file = new File(cacheDir, name);

       if (!file.exists()) {
           // Data doesn't exist
           return null;
       }

       byte[] data = new byte[(int) file.length()];
       FileInputStream is = new FileInputStream(file);
       try {
           is.read(data);
       }
       finally {
           is.close();
       }

       return data;
   }

   private static void cleanDir(File dir, long bytes) {

       long bytesDeleted = 0;
       File[] files = dir.listFiles();

       for (File file : files) {
           bytesDeleted += file.length();
           file.delete();

           if (bytesDeleted >= bytes) {
               break;
           }
       }
   }

   private static long getDirSize(File dir) {

       long size = 0;
       File[] files = dir.listFiles();

       for (File file : files) {
           if (file.isFile()) {
               size += file.length();
           }
       }

       return size;
   }
}

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