数据库储存

UserDao    userDao = DaoMaster.newDevSession(getBaseContext(), UserDao.TABLENAME).getUserDao();
//创建空集合
  private ArrayList<User> list = new ArrayList<User>();
      //在showData
 //便利循環
        for (int i = 0; i < data.size(); i++) {
            //添加進空集合
            Bean.DataBean dataBean = data.get(i);
            list.add(new User(dataBean.getUrl(), dataBean.getTitle()));
        }
        //添加數據庫
        for (int i = 0; i < list.size(); i++) {
            User user = list.get(i);
            userDao.insertOrReplace(user);
        }
        Log.i("aaa", "接收网络数据: " + mCanString);
  //panduan
        boolean networkConnected = NetWork.isNetworkConnected(MainActivity.this);
        if (networkConnected) {
            ePresenter.request();
        } else {
            Toast.makeText(this, "沒有網絡", Toast.LENGTH_SHORT).show();
            //查询数据库
            List<User> all = userDao.loadAll();
            //给rv设置布局管理器
            LinearLayoutManager layoutManager1 = new LinearLayoutManager(MainActivity.this, LinearLayoutManager.VERTICAL, false);
            Rlv.setLayoutManager(layoutManager1);
            BAdapter bAdapter = new BAdapter(R.layout.item_fresco, all);
            Rlv.setAdapter(bAdapter);

//工具类

 public static boolean isNetworkConnected(Context context) {
        //获取网络连接状态管理器
        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        //得到网络信息
        NetworkInfo info = cm.getActiveNetworkInfo();
        if (info != null) {

            return info.isAvailable();
        }

        return false;
    }