Android(安卓)获取缓存大小及清除

获取缓存的方法：

// 递归public static long getFileSize(File f) throws Exception// 取得文件夹大小{long size = 0;File flist[] = f.listFiles();for (int i = 0; i < flist.length; i++) {if (flist[i].isDirectory()) {size = size + getFileSize(flist[i]);} else {size = size + flist[i].length();}}return size;}public static String FormetFileSize(long fileS) {// 转换文件大小if(fileS == 0){return "0KB";}DecimalFormat df = new DecimalFormat("#.00");String fileSizeString = "";if (fileS < 1024) {fileSizeString = df.format((double) fileS) + "B";} else if (fileS < 1048576) {fileSizeString = df.format((double) fileS / 1024) + "K";} else if (fileS < 1073741824) {fileSizeString = df.format((double) fileS / 1048576) + "M";} else {fileSizeString = df.format((double) fileS / 1073741824) + "G";}return fileSizeString;}

获取缓存数据大小：

String cacheFileSizeString = FormetFileSize(getFileSize(getCacheDir())+ getFileSize(getExternalCacheDir()));

清除缓存是调用下面两个方法即可:

public static boolean trimCache(Context context) {        try {           File dir = context.getCacheDir();           if (dir != null && dir.isDirectory() && dir.listFiles().length != 0) {              return deleteDir(dir);           } else {           return false;           }        } catch (Exception e) {        e.printStackTrace();        return false;        }    }public static boolean trimExternalCache(Context context) {try {File dir = context.getExternalCacheDir();if (dir != null && dir.isDirectory() && dir.listFiles().length != 0) {return deleteDir(dir);} else {return false;}} catch (Exception e) {e.printStackTrace();return false;}}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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