列表视图按钮json post volley

Question

CustomListAdapter.java 

public class CustomListAdapter extends BaseAdapter { 
private Activity activity; 
private LayoutInflater inflater; 
private List<Patient> patientItems; 
private String url = "http://172.30.16.83/test/apps.php"; 
ImageLoader imageLoader = AppController.getInstance().getImageLoader(); 

public CustomListAdapter(Activity activity, List<Patient> movieItems) { 
    this.activity = activity; 
    this.patientItems = movieItems; 
} 

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

@Override 
public Object getItem(int location) { 
    return patientItems.get(location); 
} 

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

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 

    if (inflater == null) 
     inflater = (LayoutInflater) activity 
       .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    if (convertView == null) 
     convertView = inflater.inflate(R.layout.list_row, null); 

    if (imageLoader == null) 
     imageLoader = AppController.getInstance().getImageLoader(); 
    CirculaireNetworkImageView thumbNail = (CirculaireNetworkImageView) convertView 
      .findViewById(R.id.thumbnail); 

    TextView title = (TextView) convertView.findViewById(R.id.title); 
    Button viewBtn = (Button)convertView.findViewById(R.id.view_btn); 
    //TextView rating = (TextView) convertView.findViewById(R.id.rating); 
    //TextView genre = (TextView) convertView.findViewById(R.id.genre); 
    //TextView year = (TextView) convertView.findViewById(R.id.releaseYear); 
    // getting movie data for the row 
    Patient m = patientItems.get(position); 

    // thumbnail image 
    thumbNail.setImageUrl(m.getThumbnailUrl(), imageLoader); 
    // title 
    title.setText(m.getTitle()); 
    viewBtn.setTag(position); 
    viewBtn.setOnClickListener(new OnItemClickListener(position)); 
    /* 
    // rating 
    rating.setText("Rating: " + String.valueOf(m.getRating())); 

    // genre 
    String genreStr = ""; 
    for (String str : m.getGenre()) { 
     genreStr += str + ", "; 
    } 
    genreStr = genreStr.length() > 0 ? genreStr.substring(0, 
      genreStr.length() - 2) : genreStr; 
    genre.setText(genreStr); 

    // release year 
    year.setText(String.valueOf(m.getYear())); 
    */ 
    return convertView; 
} 

private class OnItemClickListener implements View.OnClickListener { 
    private int mPosition; 

    OnItemClickListener(int position) { 
     mPosition = position; 
    } 

    @Override 
    public void onClick(View arg0) { 

     Patient p=patientItems.get(mPosition); 
     final String id=p.getTitle(); 
     final String image=p.getThumbnailUrl(); 
     Log.d("Title at row" + mPosition, id); 

     Map<String, String> jsonParams = new HashMap<String, String>(); 

     jsonParams.put("id", id); 
     jsonParams.put("image", image); 

     JsonObjectRequest postRequest = new JsonObjectRequest(Request.Method.POST, url, 

       new JSONObject(jsonParams), 
       new Response.Listener<JSONObject>() { 
        @Override 
        public void onResponse(JSONObject response) { 
        } 
       }, 
       new Response.ErrorListener() { 
        @Override 
        public void onErrorResponse(VolleyError error) { 
         // Handle Error 
         Log.e("LOG", error.toString()); 
        } 
       }) { 
      @Override 
      public Map<String, String> getHeaders() throws AuthFailureError { 
       HashMap<String, String> headers = new HashMap<String, String>(); 
       headers.put("Content-Type", "application/json; charset=utf-8"); 
       headers.put("User-agent", System.getProperty("http.agent")); 
       return headers; 
      } 
     }; 
     AppController.getInstance().addToRequestQueue(postRequest); 
    } 
} 
} 

我有一个问题，我表明在logcat（json.JSONArray不能转换为JSONObject）。我知道它得到了正确的参数，但由于这个问题，我无法将它们发送给db。请给我一些帮助来解决这个问题。谢谢。

01-13 01:43:06.946 20721-20721/info.androidhive.customlistviewvolley E/LOG: com.android.volley.ParseError: org.json.JSONException: Value [{"id":"g"},{"image":"http:\/\/172.30.16.83\/test\/2.png"},{"id":"xd"},{"image":"http:\/\/172.30.16.83\/test\/2.png"},{"id":"hallo"},{"image":"http:\/\/172.30.16.83\/test\/2.png"}] of type org.json.JSONArray cannot be converted to JSONObject 

Answer 1

更改JsonObjectRequest到JsonArrayRequest。因为你的返回JSON是一个数组。

Exmp。

JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Request.Method.POST, url, 
     new Response.Listener<JSONArray>() { 
      @Override 
      public void onResponse(JSONArray response) { 

      } 
     }, 
     new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 

      } 
     } 
    ){ 
     @Override 
     public Map<String, String> getHeaders() throws AuthFailureError { 
      HashMap<String, String> headers = new HashMap<String, String>(); 
      headers.put("Content-Type", "application/json; charset=utf-8"); 
      headers.put("User-agent", System.getProperty("http.agent")); 
      return headers; 
     } 
    };