Android实现清除应用缓存功能

import android.content.Context;
import android.os.Environment;
import java.io.File;
import java.math.BigDecimal;
/**
* 获取缓存大小并清理缓存
*/
public class DataCleanManagerUtils {
/**
* 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
*/
/**
* 获取缓存值
*/
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);
}
/**
* 清除所有缓存
*/
public static void clearAllCache(Context context) {
deleteDir(context.getCacheDir());
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
deleteDir(context.getExternalCacheDir());
//TODO 有网页清理时注意排错，是否存在/data/data/应用package目录下找不到database文件夹的问题
context.deleteDatabase("webview.db");
context.deleteDatabase("webviewCache.db");
}
}
/**
* 删除某个文件
*/
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();
}
if (dir != null) {
return dir.delete();
} else {
return false;
}
}
/**
* 获取文件
*/
public static long getFolderSize(File file) {
long size = 0;
if (file != null) {
File[] fileList = file.listFiles();
if (fileList != null && fileList.length   0) {
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();
}
}
}
}
return size;
}
/**
* 格式化单位
*/
public static String getFormatSize(double size) {
double kiloByte = size / 1024;
double megaByte = kiloByte / 1024;
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 = BigDecimal.valueOf(teraBytes);
return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString()
+ "TB";
}
}