java - Android Clear Data programmatically -

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following answer https://stackoverflow.com/a/19831167/2956344

i try clear data package. when try clear data have null pointer exception in line :

...   if (appdir.exists() && appdir.isdirectory()) {             string[] children = appdir.list();             (string s : children) {           // npe! children null                 if (!s.equals("lib")) {                     deletedir(new file(appdir, s));                     toast.maketext(this, "app data deleted", toast.length_long)                             .show();                 }             }         } ...

file-explorer tool show me folder contains files. , confusion this. tell me what's wrong?

the array empty if directory empty. returns null if abstract pathname not denote directory, or if i/o error occurs.is there i/o error happening?


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