Case study of Android clearing local data cache code

Directly run the Code:

 
 

  
  
/** File name: DataCleanManager. java * Description: main functions include clearing the internal/external cache, clearing the database, clearing sharedPreference, clearing files, and clearing the custom directory */
  
  
Package com. test. DataClean;
  
  
Import java. io. File;
  
  
Import android. content. Context;
  
  
Import android. OS. Environment;
  
  
/*** Application data clearing manager */
  
  
Public class DataCleanManager {
  
  
/*** Clear the internal cache of the application (/data/com. xxx. xxx/cache) *** @ param context */
  
  
Public static void cleanInternalCache (Context context ){
  
  
DeleteFilesByDirectory (context. getCacheDir ());
  
  
}
  
  
/*** Clear all databases of the application (/data/com. xxx. xxx/databases) *** @ param context */
  
  
Public static void cleanDatabases (Context context ){
  
  
DeleteFilesByDirectory (new File ("/data/" + context. getPackageName () + "/databases "));
  
  
}
  
  
/*** Clear the application SharedPreference (/data/com. xxx. xxx/shared_prefs) *** @ param context */
  
  
Public static void cleanSharedPreference (Context context ){
  
  
DeleteFilesByDirectory (new File ("/data/" + context. getPackageName () + "/shared_prefs "));
  
  
}
  
  
/*** Clear the application database by name ** @ param context * @ param dbName */
  
  
Public static void cleanDatabaseByName (Context context, String dbName) {context. deleteDatabase (dbName );
  
  
}
  
  
/*** Clear the content in/data/com. xxx. xxx/files ** @ param context */
  
  
Public static void cleanFiles (Context context ){
  
  
DeleteFilesByDirectory (context. getFilesDir ());
  
  
}
  
  
/*** Clear content in the external cache (/mnt/sdcard/android/data/com. xxx. xxx/cache) *** @ param context */
  
  
Public static void cleanExternalCache (Context context ){
  
  
If (Environment. getExternalStorageState (). equals (Environment. MEDIA_MOUNTED )){
  
  
DeleteFilesByDirectory (context. getExternalCacheDir ());
  
  
}
  
  
}
  
  
/*** Clear the files in the custom path. Be careful when using the command. Do not delete the files by mistake. Only files in the directory can be deleted ** @ param filePath */
  
  
Public static void cleanCustomCache (String filePath ){
  
  
DeleteFilesByDirectory (new File (filePath ));
  
  
}
  
  
/*** Clear all data of this application ** @ param context * @ param filepath */
  
  
Public static void cleanApplicationData (Context context, String... filepath ){
  
  
CleanInternalCache (context );
  
  
CleanExternalCache (context );
  
  
CleanDatabases (context );
  
  
CleanSharedPreference (context );
  
  
CleanFiles (context );
  
  
For (String filePath: filepath ){
  
  
CleanCustomCache (filePath );
  
  
}
  
  
}
  
  
/*** Delete method: Only files in a folder are deleted. If the imported directory is a file, no processing will be performed. *** @ param directory */
  
  
Private static void deleteFilesByDirectory (File directory ){
  
  
If (directory! = Null & directory. exists () & directory. isDirectory ()){
  
  
For (File item: directory. listFiles ()){
  
  
Item. delete ();
  
  
}
  
  
}
  
  
}
  
  
}