有時候會遇到要清除應用緩存的功能，不經常用，總忘，所以在這里總結，實際價值個人感覺不大。

/*** 緩存管理類*/ public class DataCleanManager {/*** 獲取緩存大小** @param context* @return* @throws Exception*/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);}/*** 清空緩存** @param context*/public static boolean clearAllCache(Context context) {boolean b = false;deleteDir(context.getCacheDir());if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {b = deleteDir(context.getExternalCacheDir());}return b;}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();}// 獲取文件//Context.getExternalFilesDir() --> SDCard/Android/data/你的應用的包名/files/ 目錄，一般放一些長時間保存的數據//Context.getExternalCacheDir() --> SDCard/Android/data/你的應用包名/cache/目錄，一般存放臨時緩存數據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;}/*** 格式化單位** @param size* @return*/public static String getFormatSize(double size) {double kiloByte = size / 1024;if (kiloByte < 1) { // return size + "Byte";return "0.00M";}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() + "M";}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";} }

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