Question

我的 JSON 数据如下所示:( JSON 数据有更多数据，但我这里只放了一大块数据。）

 {
 "items": [
    {
      "id": 15,
  "batchId": 0,
 "dateCreated": "2016-05-29T19:03:37Z",
 "description": "sdfdsf",
 "ean": 0,
 "expDate": "1990-12-22T00:00:00Z",
 "itemActive": true,
 "itemAlternateNames": [
  {
  "class": "com.canre.domain.ItemAlternateName",
  "id": 16,
  "dateCreated": "2016-05-29T19:03:37Z",
  "district": null,
  "itemMaster": {
    "_ref": "../..",
    "class": "com.canre.domain.ItemMaster"
  },
  "itemName": "Ryan Reynolds",
  "language": null,
  "lastUpdated": "2016-05-29T19:03:37Z",
  "state": null
   }
  ],

2.这是我的 MainActivity类。

public class MainActivity extends Activity {

ListView listView;
ItemsAdapter adapter;
ArrayList<Items> itemsArrayList;
DBHandler dbHandler;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listview);
Button btnHit=(Button) findViewById(R.id.btnHit);
dbHandler=new DBHandler(this);
NetworkUtils utils = new NetworkUtils(MainActivity.this);
if(dbHandler.getItemsCount() == 0 && utils.isConnectingToInternet())
{
    new DataFetcherTask().execute();
}
else
{
    ArrayList<Items> itemsArrayList = dbHandler.getAllItems();
    adapter=new ItemsAdapter(MainActivity.this,itemsArrayList);
    listView.setAdapter(adapter);
 }
 }

private class DataFetcherTask extends AsyncTask<Void,Void,Void> {
@Override
protected Void doInBackground(Void... params) {
    String serverData=null;

    String dataUrl =   "my url";
    String dataUrlParameters = "Id:"+"123"+"Updated:"+"dd/mm/yyy";
    URL url;
    HttpURLConnection connection = null;
    try {
// Create connection
url = new URL(dataUrl);
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type",    "application/x-www-form-urlencoded");
        connection.setRequestProperty("Content-Length", "" + Integer.toString(dataUrlParameters.getBytes().length));
        connection.setRequestProperty("Content-Language", "en-US");
        connection.setUseCaches(false);
        connection.setDoInput(true);
        connection.setDoOutput(true);
// Send request
DataOutputStream wr = new DataOutputStream(
connection.getOutputStream());
wr.writeBytes(dataUrlParameters);
        wr.flush();
        wr.close();
// Get Response
InputStream is = connection.getInputStream();                        BufferedReader rd = new BufferedReader(new InputStreamReader(is));
        String line;
        StringBuffer response = new StringBuffer();
        while ((line = rd.readLine()) != null) {
            response.append(line);
            response.append('\r');
        }
        rd.close();
        String responseStr = response.toString();
        Log.d("Server response", responseStr);

    } catch (Exception e) {

        e.printStackTrace();

    } finally {

        if (connection != null) {
            connection.disconnect();
        }
    }
    return null;
}
protected void onPostExecute(Void aVoid){
    super.onPostExecute(aVoid);
    ArrayList<Items> itemsArrayList=dbHandler.getAllItems();
    adapter=new ItemsAdapter(MainActivity.this,itemsArrayList);
    listView.setAdapter(adapter);
}
}
}

当我运行项目时，它会抛出 fileNotFound 异常，有时会运行没有错误但是 ListView 上会显示注释....

我如何从Android上的URL解析JSON并将其显示在listview中

0 个答案: