Android如何避免 context.getExternalC

        if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())
                || !Environment.isExternalStorageRemovable()) {
            if (context.getExternalCacheDir() != null) {
                return context.getExternalCacheDir().getPath();
            } else {
                return context.getCacheDir().getPath();
            }
        } else {
            return context.getCacheDir().getPath();
        }