NetWork
依赖
//解析依赖
implementation ‘com.google.code.gson:gson:2.8.5’
implementation ‘com.android.support:design:28.0.0’
//图片轮播依赖
implementation ‘com.youth.banner:banner:1.4.9’
implementation ‘com.github.bumptech.glide:glide:3.7.0’
//图片框架
implementation ‘com.nostra13.universalimageloader:universal-image-loader:1.9.5’
//pulllist展示
implementation ‘com.github.userswlwork:pull-to-refresh:1.0.0’
//网络请求
public static String getJson(String urlString){
try {
//创建链接
URL url = new URL(urlString);
//得到HttpURLConnection
HttpURLConnection httpURLConnection=(HttpURLConnection) url.openConnection();
//获取返回码
int responseCode = httpURLConnection.getResponseCode();
//判断
if (responseCode==200){
InputStream inputStream = httpURLConnection.getInputStream();
String temp;
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
while ((temp=bufferedReader.readLine())!=null){
StringBuffer stringBuffer = new StringBuffer();
stringBuffer.append(temp);
return stringBuffer.toString();
}
}
} catch (Exception e) {
e.printStackTrace();
}
return "";
}
//网络判断
public static boolean isconn(Context context){
ConnectivityManager service = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = service.getActiveNetworkInfo();
if (info!=null && info.isConnected()){
return true;
}else{
return false;
}
}
在mainAcyivity里进行判断
private void iniData(int pag) {
String s = urlString + pag;
if (NetWorkwhy.isconn(getActivity())){
new MAsycTask().execute(s);
}else{
Toast.makeText(getActivity(),"没网",Toast.LENGTH_LONG).show();
//查询
ArrayList<Json.ResultBean> list = userDao.query();
//获取适配器
adapter = new MyAdapter(list, getActivity());
//设置适配器
pull.setAdapter(adapter);
}
}
AsyncTask与数据库是这样写的
private class MAsycTask extends AsyncTask<String,Void,String> {
@Override
protected String doInBackground(String... strings) {
//return NetWordUtils.et(strings[0]);
String netjson = NetWorkwhy.getJson(strings[0]);
return netjson;
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
Gson gson = new Gson();
Json json = gson.fromJson(s, Json.class);
List<Json.ResultBean> result = json.getResult();
list.addAll(result);
//获取数据库长度
for (int i=0;i<list.size();i++){
String summary = list.get(i).getSummary();
//添加到数据库
userDao.add(summary);
}
adapter.notifyDataSetChanged();
pull.onRefreshComplete();
}
}