Clear Cache in Android Application programmatically

Question

what is the correct way to clear cache in android Application programmatically  I already using following code but its not look work for me   Override protected void onDestroy            TODO Auto-generated method stub     super onDestroy        clearApplicationData       public void clearApplicationData         File cache   getCacheDir        File appDir   new File cache getParent         if  appDir exists              String   children   appDir list            for  String s   children                if   s equals  lib                      deleteDir new File appDir  s                    Log i  EEEEEERRRRRRROOOOOOORRRR                     File  data data APP PACKAGE     s     DELETED                                                         public static boolean deleteDir File dir        if  dir    null  amp  amp  dir isDirectory              String   children   dir list            for  int i   0  i  lt  children length  i                  boolean success   deleteDir new File dir  children i                 if   success                    return false                                     return dir delete

User · Answer

I am not sure but I sow this code too  this cod will work faster and in my mind its simple too  just get your apps cache directory and delete all files in directory  public boolean clearCache         try               create an array object of File type for referencing of cache files            File   files   getBaseContext   getCacheDir   listFiles                use a for etch loop to delete files one by one         for  File file   files                     you can use just   file delete     function of class File                 or use if for being sure if file deleted                 here if file dose not delete returns false and condition will                 will be true and it ends operation of function by return                  false then we will find that all files are not delete                               if   file delete                       return false             not success                                      if for loop completes and process not ended it returns true            return true          success of deleting files        catch  Exception e             try stops deleting cache files     return false           not success      It gets all of cache files in File array by getBaseContext   getCacheDir   listFiles   and then deletes one by one in a loop by file delet   method

User · Answer

Kotlin has an one-liner  context cacheDir deleteRecursively

User · Answer

The answer from dhams is correct  after having been edited several times   but as the many edits of the code shows  it is difficult to write correct and robust code for deleting a directory  with sub-dirs  yourself  So I strongly suggest using Apache Commons IO  or some other API that does this for you   import org apache commons io FileUtils           Delete local cache dir  ignoring any errors   FileUtils deleteQuietly context getCacheDir       PS  Also delete the directory returned by context getExternalCacheDir   if you use that   To be able to use Apache Commons IO  add this to your build gradle file  in the dependencies part   compile  commons-io commons-io 2 4

User · Answer

Put this code in onStop   method of MainActivity   Override protected void onStop         super onStop        AppUtils deleteCache getApplicationContext         public class AppUtils       public static void deleteCache Context context            try               File dir   context getCacheDir                deleteDir dir             catch  Exception e                public static boolean deleteDir File dir            if  dir    null  amp  amp  dir isDirectory                  String   children   dir list                for  int i   0  i  lt  children length  i                      boolean success   deleteDir new File dir  children i                     if   success                        return false                                              return dir delete              else if dir   null  amp  amp  dir isFile                  return dir delete              else               return false

User · Answer

If you are looking for delete cache of your own application then simply delete your cache  directory and its all done    public static void deleteCache Context context        try           File dir   context getCacheDir            deleteDir dir         catch  Exception e    e printStackTrace        public static boolean deleteDir File dir        if  dir    null  amp  amp  dir isDirectory              String   children   dir list            for  int i   0  i  lt  children length  i                  boolean success   deleteDir new File dir  children i                 if   success                    return false                                  return dir delete          else if dir   null  amp  amp  dir isFile              return dir delete          else           return false

User · Answer

I think you re supposed to place clearApplicationData   before the super OnDestroy     Your app can t process any methods when it has been shut down

User · Answer

Try this   Override protected void onDestroy            TODO Auto-generated method stub     super onDestroy        clearApplicationData       public void clearApplicationData         File cache   getCacheDir        File appDir   new File cache getParent         if  appDir exists              String   children   appDir list            for  String s   children                if   s equals  lib                      deleteDir new File appDir  s                    Log i  EEEEEERRRRRROOOOOOORRRR                     File  data data APP PACKAGE     s     DELETED                                                         public static boolean deleteDir File dir        if  dir    null  amp  amp  dir isDirectory              String   children   dir list            int i   0          while  i  lt  children length                boolean success   deleteDir new File dir  children i                 if   success                    return false                            i                         assert dir    null      return dir delete

User · Answer

This code will remove your whole cache of the application  You can check on app setting and open the app info and check the size of cache  Once you will use this code your cache size will be 0KB   So it and enjoy the clean cache     if  Build VERSION CODES KITKAT  lt   Build VERSION SDK INT                  ActivityManager  context getSystemService ACTIVITY SERVICE                        clearApplicationUserData                return

[android] Clear Cache in Android Application programmatically

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