将assets文件夹下/db的本地库拷贝到/data/data/下

来源：互联网发布：水果淘宝店店名大全编辑：程序博客网时间：2024/05/14 17:08

/**
     * 将assets文件夹下/db的本地库拷贝到/data/data/下
     *
     * @param context
     * @param tab_name
     */
    public static void copyDbFile(Context context, String tab_name) {
        InputStream in = null;
        FileOutputStream out = null;
        /**data/data/路径*/
        String path = "/data/data/" + context.getPackageName() + "/databases";
        File file = new File(path + "/" + tab_name);

try {

            //创建文件夹
            File file_ = new File(path);
            if (!file_.exists())
                file_.mkdirs();

            if (file.exists())//删除已经存在的
                file.deleteOnExit();
            //创建新的文件
            if (!file.exists())
                file.createNewFile();

            in = context.getAssets().open("db/" + tab_name + ".db"); // 从assets目录下复制
            out = new FileOutputStream(file);
            int length = -1;
            byte[] buf = new byte[1024];
            while ((length = in.read(buf)) != -1) {
                out.write(buf, 0, length);
            }
            out.flush();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (in != null) in.close();
                if (out != null) out.close();
            } catch (IOException e1) {
                e1.printStackTrace();
            }
        }

}

0 0