项目中碰到了计算缓存大小和清空缓存的功能,这个很常见的功能,几乎每个APP都有,以下的这个类的功能很简单,计算你的缓存总大小,不管内
部缓存还是外部缓存,和清空缓存,包括内部和外部的缓存一起清空。
public
class
DataCleanManager
{
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);
}
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();
for
(
int
i =
0
;
i < children.length; i++) {
boolean
success = deleteDir(
new
File(dir, children[i]));
if
(!success) {
return
false
;
}
}
}
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();
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;
}
/**
*
格式化单位
*
*
@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"
;
}
}