java - 清除不起作用的缓存应用程序

Question

我想在我的应用程序中添加直接从应用程序本身清除缓存的功能，而无需进入设置。在 Stack Overflow 上寻找这里我发现了这个片段，但它有很多错误。你能帮我解决吗？

Preference cache;
cache = (Preference) this.findPreference("cache");
cache.setOnPreferenceClickListener(new OnPreferenceClickListener() {
     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("TAG", "**************** File /data/data/APP_PACKAGE/" + s + " DELETED *******************");
                }
            }
        }
    }

    public static boolean deleteDir(File dir) 
    {
        if (dir != null && dir.isDirectory()) {
            String[] children = dir.list();
            for (int i = 0; i < children.length; i++) {
                boolean success = deleteDir(new File(dir, children[i]));
                if (!success) {
                    return false;
                }
            }
        }
        return dir.delete();

}

eclipse 在此处标记错误 File appDir = new File(cache.getParent());，此处为 }，此处为 public static boolean deleteDir(File dir)，此处为 if (dir != null && dir.isDirectory()) {