android清理app缓存，计算缓存大小 工具类

public class DataCleanManager {/** * @param context * @return * @throws Exception *             获取当前缓存 */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);}/** * @param context *            删除缓存 */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();int size = 0;if (children != null) {size = children.length;for (int i = 0; i < size; i++) {boolean success = deleteDir(new File(dir, children[i]));if (!success) {return false;}}}}if (dir == null) {return true;} else {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();int size2 = 0;if (fileList != null) {size2 = fileList.length;for (int i = 0; i < size2; 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 * 计算缓存的大小 * @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";}}