Case study of Android clearing local data cache code

Source: Internet
Author: User

Directly run the Code:

 
 
  1. /** 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 */
  2. Package com. test. DataClean;
  3. Import java. io. File;
  4. Import android. content. Context;
  5. Import android. OS. Environment;
  6. /*** Application data clearing manager */
  7. Public class DataCleanManager {
  8. /*** Clear the internal cache of the application (/data/com. xxx. xxx/cache) *** @ param context */
  9. Public static void cleanInternalCache (Context context ){
  10. DeleteFilesByDirectory (context. getCacheDir ());
  11. }
  12. /*** Clear all databases of the application (/data/com. xxx. xxx/databases) *** @ param context */
  13. Public static void cleanDatabases (Context context ){
  14. DeleteFilesByDirectory (new File ("/data/" + context. getPackageName () + "/databases "));
  15. }
  16. /*** Clear the application SharedPreference (/data/com. xxx. xxx/shared_prefs) *** @ param context */
  17. Public static void cleanSharedPreference (Context context ){
  18. DeleteFilesByDirectory (new File ("/data/" + context. getPackageName () + "/shared_prefs "));
  19. }
  20. /*** Clear the application database by name ** @ param context * @ param dbName */
  21. Public static void cleanDatabaseByName (Context context, String dbName) {context. deleteDatabase (dbName );
  22. }
  23. /*** Clear the content in/data/com. xxx. xxx/files ** @ param context */
  24. Public static void cleanFiles (Context context ){
  25. DeleteFilesByDirectory (context. getFilesDir ());
  26. }
  27. /*** Clear content in the external cache (/mnt/sdcard/android/data/com. xxx. xxx/cache) *** @ param context */
  28. Public static void cleanExternalCache (Context context ){
  29. If (Environment. getExternalStorageState (). equals (Environment. MEDIA_MOUNTED )){
  30. DeleteFilesByDirectory (context. getExternalCacheDir ());
  31. }
  32. }
  33. /*** 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 */
  34. Public static void cleanCustomCache (String filePath ){
  35. DeleteFilesByDirectory (new File (filePath ));
  36. }
  37. /*** Clear all data of this application ** @ param context * @ param filepath */
  38. Public static void cleanApplicationData (Context context, String... filepath ){
  39. CleanInternalCache (context );
  40. CleanExternalCache (context );
  41. CleanDatabases (context );
  42. CleanSharedPreference (context );
  43. CleanFiles (context );
  44. For (String filePath: filepath ){
  45. CleanCustomCache (filePath );
  46. }
  47. }
  48. /*** Delete method: Only files in a folder are deleted. If the imported directory is a file, no processing will be performed. *** @ param directory */
  49. Private static void deleteFilesByDirectory (File directory ){
  50. If (directory! = Null & directory. exists () & directory. isDirectory ()){
  51. For (File item: directory. listFiles ()){
  52. Item. delete ();
  53. }
  54. }
  55. }
  56. }

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