JSON Parsing mit Volley-Bibliothek

Question

Hallo kann jemand Erfahrung mit Volley-Bibliothek mir helfen, JSON in den folgenden Code zu bekommen. Bin gettin ein Fehlerprotokoll:

D/Volley: [13] BasicNetwork.logSlowRequests: HTTP response for request=<[ ] http://digitaresolutions.com/apps/drugindex/getbrand.php?id=bactiflox 0xdf379d06 NORMAL 1> [lifetime=19209], [size=160], [rc=200], [retryCount=0]; I/Search_view: org.json.JSONException: Value of type java.lang.String cannot be converted to JSONObject

public class Search_view extends AppCompatActivity { 
String brandURL = "http://digitaresolutions.com/apps/drugindex/getbrand.php?id="; 

private String TAG = this.getClass().getSimpleName(); 
private ListView lstView; 
private RequestQueue mRequestQueue; 
private ArrayList<BrandModel> arrBrand ; 
private LayoutInflater lf; 
private VolleyAdapter va; 
private ProgressDialog pd; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.brand_main); 
    lf = LayoutInflater.from(this); 


    arrBrand = new ArrayList<BrandModel>(); 
    va = new VolleyAdapter(); 

    lstView = (ListView) findViewById(R.id.listView); 
    lstView.setAdapter(va); 
    mRequestQueue = Volley.newRequestQueue(this); 

    // getting attached intent data 
    Intent i = getIntent(); 
    String product = i.getStringExtra("product"); 

    // displaying selected product name 
    String url = brandURL + product; 

    // JSON Data 
    pd = ProgressDialog.show(this,"Loading...","Please Wait..."); 
    try{ 
     Thread.sleep(2000); 
    }catch(Exception e){ 

    } 
    JsonObjectRequest jr = new JsonObjectRequest(Request.Method.GET,url,null,new Response.Listener<JSONObject>() { 
     @Override 
     public void onResponse(JSONObject response) { 
      Log.i(TAG,response.toString()); 
      parseJSON(response); 
      va.notifyDataSetChanged(); 
      pd.dismiss(); 
      ;   } 
    },new Response.ErrorListener() { 
     @Override 
     public void onErrorResponse(VolleyError error) { 
      Log.i(TAG,error.getMessage()); 
     } 
    }); 
    mRequestQueue.add(jr); 



} 

private void parseJSON(JSONObject json){ 
    try{ 
     JSONObject value = json.getJSONObject(null); 
     JSONArray items = value.getJSONArray("result"); 
     for(int x=0;x<items.length();x++){ 

      JSONObject item = items.getJSONObject(x); 
      BrandModel nm = new BrandModel(); 
      nm.setDrugbrand(item.optString("drugbrand")); 
      nm.setManu(item.optString("manu")); 
      nm.setDetails(item.optString("details")); 
      arrBrand.add(nm); 
     } 
    } 
    catch(Exception e){ 
     e.printStackTrace(); 
    } 


} 


public class BrandModel 
{ 
    private String details; 

    private String manu; 

    private String drugbrand; 

    public String getDetails() 
    { 
     return details; 
    } 

    public void setDetails (String details) 
    { 
     this.details = details; 
    } 

    public String getManu() 
    { 
     return manu; 
    } 

    public void setManu (String manu) 
    { 
     this.manu = manu; 
    } 

    public String getDrugbrand() 
    { 
     return drugbrand; 
    } 

    public void setDrugbrand (String drugbrand) 
    { 
     this.drugbrand = drugbrand; 
    } 

    @Override 
    public String toString() 
    { 
     return "ClassPojo [details = "+details+", manu = "+manu+", drugbrand = "+drugbrand+"]"; 
    } 
} 


class VolleyAdapter extends BaseAdapter{ 

    @Override 
    public int getCount() { 
     return arrBrand.size(); 
    } 

    @Override 
    public Object getItem(int x) { 
     return arrBrand.get(x); 
    } 

    @Override 
    public long getItemId(int x) { 
     return 0; 
    } 

    @Override 
    public View getView(int x, View view, ViewGroup viewGroup) { 
     ViewHolder vh ; 
     if(view == null){ 
      vh = new ViewHolder(); 
      view = lf.inflate(R.layout.brand_row_listview,null); 
      vh.tvTitle = (TextView) view.findViewById(R.id.txtTitle); 
      vh.tvManu = (TextView) view.findViewById(R.id.txtManufacturer); 
      vh.tvDetails = (TextView) view.findViewById(R.id.txtDetails); 
      view.setTag(vh); 
     } 
     else{ 
      vh = (ViewHolder) view.getTag(); 
     } 

     BrandModel nm = arrBrand.get(x); 
     vh.tvTitle.setText(nm.getDrugbrand()); 
     vh.tvManu.setText(nm.getManu()); 
     vh.tvDetails.setText(nm.getDetails()); 
     return view; 
    } 

    class ViewHolder{ 
     TextView tvTitle; 
     TextView tvManu; 
     TextView tvDetails; 

    } 
    // End JSON Loading code block 
} 

}

Answer 1

Entfernen Sie diese Zeile

JSONObject value = json.getJSONObject(null); 

Ändern Sie diese Zeile ...

JSONArray items = value.getJSONArray("result") 

zu

JSONArray items = json.getJSONArray("result"); 

Answer 2

Ersetzen Sie JsonObjectRequest zu StringRequest.
d.h.

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.brand_main); 
    lf = LayoutInflater.from(this); 


    arrBrand = new ArrayList<BrandModel>(); 
    va = new VolleyAdapter(); 

    lstView = (ListView) findViewById(R.id.listView); 
    lstView.setAdapter(va); 
    mRequestQueue = Volley.newRequestQueue(this); 

    // getting attached intent data 
    Intent i = getIntent(); 
    String product = i.getStringExtra("product"); 

    // displaying selected product name 
    String url = brandURL + product; 

    // JSON Data 
    pd = ProgressDialog.show(this,"Loading...","Please Wait..."); 
    try{ 
     Thread.sleep(2000); 
    }catch(Exception e){ 

    } 
    StringRequest req=new StringRequest(url, new Listener<String>() { 

      @Override 
      public void onResponse(String response) { 
       // TODO Auto-generated method stub 

       try { 
       parseJSON(new JSONObject(response)); 
       va.notifyDataSetChanged(); 
       pd.dismiss(); 
      } catch (JSONException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 

      } 
     }, new ErrorListener() { 

      @Override 
      public void onErrorResponse(VolleyError arg0) { 
       // TODO Auto-generated method stub 
       pd.dismiss(); 
      } 
     }); 

     mRequestQueue.add(req); 
} 

mit folgendem Code ersetzen parseJSON Funktion.

private void parseJSON(JSONObject json){ 
     try{ 

      if(!json.isNull("result")) { 

       JSONArray items = json.getJSONArray("result"); 
       for (int x = 0; x < items.length(); x++) { 

        JSONObject item = items.getJSONObject(x); 
        BrandModel nm = new BrandModel(); 
        nm.setDrugbrand(item.optString("drugbrand")); 
        nm.setManu(item.optString("manu")); 
        nm.setDetails(item.optString("details")); 
        arrBrand.add(nm); 
       } 
      } 
     } 
     catch(Exception e){ 
      e.printStackTrace(); 
     } 
    } 

Versuchen Sie es. es hat funktioniert.

Answer 3

Sehen Sie, wenn diese

public class SomeActivity extends AppCompatActivity { 

    ProgressDialog pd; 
    TextView txtView; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.layout_volley); 

     txtView = (TextView) findViewById(R.id.txt_volley); 

     String id = "bactiflox"; 
     String url = new Uri.Builder() 
       .encodedPath("http://digitaresolutions.com") 
       .appendEncodedPath("apps/drugindex/getbrand.php") 
       .appendQueryParameter("id", id) 
       .build().toString(); 

     JsonObjectRequest req = new JsonObjectRequest(url, new Response.Listener<JSONObject>() { 
      @Override 
      public void onResponse(JSONObject response) { 
       pd.dismiss(); 
       txtView.setText(response.toString()); 

       try { 
        JSONArray mydata = response.getJSONArray("mydata"); 
        for (int i = 0; i < mydata.length(); i++) { 
         JSONObject obj = mydata.getJSONObject(i); 

         Log.i("JSON", obj.getString("manu")); 
         Log.i("JSON", obj.getString("details")); 
         Log.i("JSON", obj.getString("drugbrand")); 
        } 
       } catch (JSONException e) { 
        txtView.setText(e.toString()); 
       } 

      } 
     }, new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 
       pd.dismiss(); 
       txtView.setText(String.valueOf(error)); 
      } 
     }); 

     addToRequestQueue(req); // TODO: Implement 
     pd = ProgressDialog.show(this,"Loading...","Please Wait..."); 

    } 

}