缓存功能工具类

本文主要是介绍缓存功能工具类，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

Android开发中会造成一定的缓存，如与服务器之间进行通信，就必然需要从服务端获取数据，在/data/data/com.xxx.xxx/cache文件夹下生产缓存。在开发中可能需要获取缓存，或清除缓存，编写的工具类。

1、获取缓存大小

    public static String getTotalCacheSize(Context context) {long cacheSize = getFolderSize(context.getCacheDir());if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {cacheSize += getFolderSize(context.getExternalCacheDir());}return getFormatSize(cacheSize);}public static String getFormatSize(double size) {double kiloByte = size / 1024;if (kiloByte < 1) {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";}

2、获取文件大小

public static long getFolderSize(File file) {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;}

3、删除所有的缓存

public static void clearAllCache(Context context) {deleteDir(context.getCacheDir());if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {deleteDir(context.getExternalCacheDir());}}public 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();}

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