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();

}