ちょっとメモ。

public class LocalStorageManager {
    private static final int mPrivateMode = Context.MODE_PRIVATE;
    private static final int mPublicMode  = Context.MODE_WORLD_WRITEABLE | Context.MODE_WORLD_READABLE;
    private static final String prefix = "app_";
    
    /**
    * /data/data/パッケージ名を取得する
    * @param context
    * @return
    * @throws FileNotFoundException 
    */
    public static final File getPackageNameDirectory (Context context) throws FileNotFoundException {
        String temporary = "hoge";
        StringBuilder builder = new StringBuilder();
        builder.append(prefix).append(temporary);
        
        File root = new File(context.getDir(temporary, mPrivateMode).getAbsolutePath().replace(builder.toString(), ""));
        if (!root.exists()) {
            throw new FileNotFoundException();
        }
        return root;
    }

    /**
    * /data/data/パッケージ名/直下にpathフォルダがあるかどうか
    * @param context
    * @param path app_"path"ディレクトリ名 
    * @return
    */
    public static final File findLocalDirectory (Context context, final String path) {
        try {
            File find = new File(getPackageNameDirectory(context), path);
            if (find.exists()) {
                return find;
            }
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
    }
}