difference between clear data and clear cache ? Android

setting中清除代码

1: 清空缓存

packageManager 中   packageManagerService -> deleteApplicationCacheFilesAsUser(

final UserEnvironment userEnv = new UserEnvironment(curUser);

clearDirectory(conn.mContainerService,
        userEnv.buildExternalStorageAppCacheDirs(packageName));
clearDirectory(conn.mContainerService,
        userEnv.buildExternalStorageAppDataDirs(packageName));
clearDirectory(conn.mContainerService,
        userEnv.buildExternalStorageAppMediaDirs(packageName));

buildExternalStorageApp＊＊＊ 三个目录对应的 sdcard/android/0/［包名］／     1:cache 2:media 3:data三个目录

2:清空数据

关于清空数据，看代码会看到

1: 杀掉应用 

2:做了清空缓存的处理逻辑，

3:清空了recenttask中的记录

http://droidyue.com/blog/2014/06/15/what-will-be-removed-if-you-click-clear-data-button-in-system-application-item/index.html