判断网络

判断有没有网络

if判断没有网络进行吐司


 if(!HaveNetWork()) {
            Toast.makeText(getActivity(), "没有网络", Toast.LENGTH_SHORT).show();
     }else{

	//另一种情况就是有网进行请求数据

            String Urlwith = path +page;
            new AsyncTask<String,String, List<com.example.moni.bean.Person.DateBean>>(){

                @Override
                protected List<com.example.moni.bean.Person.DateBean> doInBackground(String... strings) {
                    com.example.moni.bean.Person dian = null;

                    try {
                        URL url = new URL(path);

                        HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();

                        httpURLConnection.setReadTimeout(5000);
                        httpURLConnection.setConnectTimeout(5000);
                        httpURLConnection.setRequestMethod("GET");

                        int request = httpURLConnection.getResponseCode();
                        if(request == 200){
                            String str = String2(httpURLConnection.getInputStream());
                            dian =  new Gson().fromJson(str, com.example.moni.bean.Person.class);
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    }

                    return dian == null ? null : dian.getData();
                }

                @Override
                protected void onPostExecute(List<com.example.moni.bean.Person.DateBean> dateBean) {
                    if(dateBean == null){
                        Toast.makeText(getActivity(),"下拉数据失败",Toast.LENGTH_SHORT).show();
                    }
                    updateset(dateBean);
                    stopdf();

                    super.onPostExecute(dateBean);
                }
            }.execute(Urlwith);
        }

创建一个方法
//判断网络
public boolean HaveNetWork() {
ConnectivityManager con = (ConnectivityManager) getActivity().getSystemService( Context.CONNECTIVITY_SERVICE );
NetworkInfo act = con.getActiveNetworkInfo();
return act!=null && act.isAvailable();
}