Gridview中的Json分析不起作用

Question

我想在网格视图中显示我的用户（带图像）我的jSON，在数组中给出正确的响应

但在解析Json后，数据不会显示在网格视图中

我的日志猫没有给我任何错误只是显示

06-05 12:21:12.269: I/Choreographer(4047): Skipped 1134 frames!  The application may be doing too much work on its main thread.

这是我的活动

public class MeetPeople extends Activity {

private ProgressDialog pDialog;
private GridView gridView;
//private GridViewAdapter customGridAdapter;
// URL to get contacts JSON
private static String url = "http://www.get2love.webitexperts.com/nearbyusers";

// JSON Node names
private static final String TAG_CONTACTS = "";
private static final String TAG_ID = "User_Id";
private static final String TAG_NAME = "User_Full_Name";
private static final String TAG_IMAGE = "User_Image";


// contacts JSONArray
JSONArray contacts = null;

// Hashmap for ListView
ArrayList<HashMap<String, String>> contactList;
GridViewAdapter customGridAdapter;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.meetpeople);
    //requestWindowFeature(Window.FEATURE_NO_TITLE);

    contactList = new ArrayList<HashMap<String, String>>();
    // Calling async task to get json
            new GetContacts().execute();
    //ListView lv = getListView();
    gridView = (GridView) findViewById(R.id.gridView);
    customGridAdapter = new GridViewAdapter(this, R.layout.row_grid, contactList);
    gridView.setAdapter(customGridAdapter);

    gridView.setOnItemClickListener(new OnItemClickListener() {
                public void onItemClick(AdapterView<?> parent, View v,int position, long id) {
                        Toast.makeText(MeetPeople.this, position + "#Selected",Toast.LENGTH_SHORT).show();
                    }

                });

}

/**
 * Async task class to get json by making HTTP call
 * */
private class GetContacts extends AsyncTask<Void, Void, ArrayList<HashMap<String, String>>> {
    ArrayList<HashMap<String, String>>  contact_List = new ArrayList<HashMap<String, String>>();
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        // Showing progress dialog
        pDialog = new ProgressDialog(MeetPeople.this);
        pDialog.setMessage("Please wait...");
        pDialog.setCancelable(false);
        pDialog.show();

    }

    @Override
    protected ArrayList<HashMap<String, String>> doInBackground(Void... arg0) {
        List<NameValuePair> params = new ArrayList<NameValuePair>();

         UserModel user = (UserModel) getIntent().getSerializableExtra("User");
        String ID=String.valueOf(user.getUser_Id());
        String DST=String.valueOf(100);
        params.add(new BasicNameValuePair("id",ID));
        params.add(new BasicNameValuePair("distance", DST));
        // Creating service handler class instance
        ServiceHandler sh = new ServiceHandler();

        // Making a request to url and getting response
        String jsonStr = sh.makeServiceCall(url, ServiceHandler.POST, params);

        Log.d("Response: ", "> " + jsonStr);

        if (jsonStr != null) {
            try {
                JSONArray contacts = new JSONArray(jsonStr);

                // Getting JSON Array node


                // looping through All Contacts
                for (int i = 0; i < contacts.length(); i++) {
                    JSONObject c = contacts.getJSONObject(i);

                    String User_Id = c.getString(TAG_ID);
                    String User_Full_Name = c.getString(TAG_NAME);
                    String User_Image=c.getString(TAG_IMAGE);


                    // Phone node is JSON Object


                    // tmp hashmap for single contact

                    HashMap<String, String> contact = new HashMap<String, String>();

                    // adding each child node to HashMap key => value
                    contact.put(TAG_ID, User_Id);
                    contact.put(TAG_NAME, User_Full_Name);
                    contact.put(TAG_IMAGE, User_Image);


                    // adding contact to contact list
                    contact_List.add(contact);

                }
                return contact_List;
            } catch (JSONException e) {
                e.printStackTrace();
            }
        } else {
            Log.e("ServiceHandler", "Couldn't get any data from the url");
        }

        return null;
    }

    @Override
    protected void onPostExecute(final ArrayList<HashMap<String, String>> result) {
        super.onPostExecute(result);
        // Dismiss the progress dialog
        if (pDialog.isShowing())
            pDialog.dismiss();
        contact_List=result;
        gridView = (GridView) findViewById(R.id.gridView);
        customGridAdapter = new GridViewAdapter(MeetPeople.this, R.layout.row_grid, contactList);
        gridView.setAdapter(customGridAdapter);
    /*runOnUiThread( new Runnable() {
        public void run() {
            contactList=result;

        }
    });*/

        /**
         * Updating parsed JSON data into ListView
         * */
        /*ListAdapter adapter = new SimpleAdapter(
                MeetPeople.this, contactList,
                R.layout.row_grid, new String[] { TAG_NAME
                        }, new int[] { R.id.name });

        setAdapter(customGridAdapter);*/
    }

}

}

这是我的GridViewAdapter

public class GridViewAdapter extends BaseAdapter {
private Context context;
private int layoutResourceId;
private ArrayList<HashMap<String, String>> data = new ArrayList<HashMap<String, String>>();

public GridViewAdapter(Context context, int layoutResourceId,ArrayList<HashMap<String, String>> data) {
   // super(context, layoutResourceId, data);
    this.layoutResourceId = layoutResourceId;
    this.context = context;
    this.data = data;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View row = convertView;
    ViewHolder holder = null;

    if (row == null) {
        LayoutInflater inflater = ((Activity) context).getLayoutInflater();
        row = inflater.inflate(layoutResourceId, parent, false);
        holder = new ViewHolder();
        holder.imageTitle = (TextView) row.findViewById(R.id.text);
        holder.image = (ImageView) row.findViewById(R.id.image);
        row.setTag(holder);
    } else {
        holder = (ViewHolder) row.getTag();
    }

  //  ImageItem item = data.get(position);
    holder.imageTitle.setText(getItem(position, "TAG_NAME"));
    holder.image.setImageBitmap(getImage(position));
    return row;
}

static class ViewHolder {
    TextView imageTitle;
    ImageView image;
}

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return 0;
}

public String getItem(int arg0,String key) {

    return data.get(arg0).get(key);
}
 public Bitmap getImage(int pos){
String  url = data.get(pos).get("TAG_IMAGE");
 MemoryCache memoryCache=new MemoryCache();
 Bitmap bitmap=memoryCache.get(url);
 if(bitmap!=null)
    // imageView.setImageBitmap(bitmap);
     return bitmap;
 else
 {
   // queuePhoto(url, imageView);
   //  imageView.setImageResource(loader);
 }
return null;


}
@Override
public long getItemId(int arg0) {
    // TODO Auto-generated method stub
    return 0;
}

@Override
public Object getItem(int arg0) {
    // TODO Auto-generated method stub
    return null;
}
 }

这是我的日志

06-05 12:20:47.039: D/StrictMode(4047):     at dalvik.system.NativeStart.main(Native Method)
06-05 12:20:53.799: D/Response:(4047): >     [{"User_Id":"49","User_Full_Name":"meet","User_Image":""},{"User_Id":"50","User_Full_Name":"meet","User_Image":"http:\/\/www.get2love.webitexperts.com\/profile_images\/1400754860profile.jpg"},{"User_Id":"51","User_Full_Name":"meet","User_Image":"http:\/\/www.get2love.webitexperts.com\/profile_images\/1400756097profile.jpg"},{"User_Id":"71","User_Full_Name":"hh","User_Image":"http:\/\/www.get2love.webitexperts.com\/profile_images\/1401479271profile.jpg"},{"User_Id":"72","User_Full_Name":"hh","User_Image":"http:\/\/www.get2love.webitexperts.com\/profile_images\/1401479340profile.jpg"},{"User_Id":"73","User_Full_Name":"lkjh","User_Image":"http:\/\/www.get2love.webitexperts.com\/profile_images\/1401479662profile.jpg"},{"User_Id":"76","User_Full_Name":"jhon","User_Image":"http:\/\/www.get2love.webitexperts.com\/profile_images\/1401714195profile.jpg"},{"User_Id":"79","User_Full_Name":"sammy","User_Image":"http:\/\/www.get2love.webitexperts.com\/profile_images\/1401889294profile.jpg"}]
 06-05 12:21:12.269: I/Choreographer(4047): Skipped 1134 frames!  The application may be doing too much work on its main thread.
 06-05 12:21:38.829: I/Choreographer(4047): Skipped 1533 frames!  The application may be doing too much work on its main thread.

有人能解决我的问题吗？我想在GridView（UserImage）中显示这些响应

请先谢谢你

在代码中编辑后的新logcat。。。。根据Answer

06-05 13:22:22.849: E/Trace(8790): error opening trace file: No such file or directory (2)
06-05 13:23:41.839: E/Buffer Error(8790): Error converting result java.lang.NullPointerException

06-05 13:23:41.839： E/JSON Parser（8790）：解析数据org.json.JSONException：在06-05 13:23:51.759的字符0处输入结束： E/AndroidRuntime（8790）： FATAL EXCEPTION： AsyncTask#1 06-05 13:23:51.759： E/AndroidRuntime（8790）：java.lang.RuntimeException：在执行doInbackground（）06-05 13:23:51.759： E/AndroidRuntime（8790）： atandroid.os.AsyncTask$3.done（AsyncTask.java:299）06-05 13:23:51.759： E/AndroidRuntime（8790）： atjava.util.concurrent.FutureTask$Sync.innerSetException（FutureTask.java:273）06-05 13:23:51.759： E/AndroidRuntime（8790）： atjava.util.concurrent.FutureTask.setException（FutureTask.java:124）06-05 13:23:51.759： E/AndroidRuntime（8790java.util.concurrent.FutureTask.run（FutureTask.java:137）06-05 13:23:51.759： E/AndroidRuntime（8790）： atandroid.os.AsyncTask$SerialExecitor$1.run（AsyncTask.java:230）06-05 13:23:51.759： E/AndroidRuntime（8790）： atjava.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1076）06-05 13:23:51.759： E/AndroidRuntime（8790）： atjava.util.concurrent.ThreadPoolExecitor$Worker.run（ThreadPoolExecutor.java:569）06-05 13:23:51.759： E/AndroidRuntime（8790）： atjava.lang.Thread.run（Thread.java:856）06-05 13:23:51.759： E/AndroidRuntime（8790）：由以下原因引起：NullPointerException 06-05 13:23:51.759： E/AndroidRuntime（8790）： atcom.example.phonebook.Mainactive$loginAccess. doInbackground（Mainactive. jWindowManagerInp. addView（WindowManagerInp. java： 292）06-05 13:23:52.309：E/WindowManager（8790）：在android. view。WindowManagerInp. addView（WindowManagerInp. java： 224）06-05 13:23:52.309：E/WindowManager（8790）：在android. view。WindowManagerImpl$CompatModeWrapper. addView（WindowManagerInp. java： 149）06-05 13:23:52.309：E/WindowManager（8790）：在android. view。Window$LocalWindowManager. addView（Windows. java： 547）06-05 13:23:52.309：E/WindowManager（8790）：在android. app. Dialog. show（Dialo. java： 277）06-05 13:23:52.309：E/WindowManager（8MainActivity2 dollars. onClick（MainActivity. java： 112）06-05 13:23:52.309：E/WindowManager（8790）：在android. view。View. performClick（View. java： 4084）06-05 13:23:52.309：E/WindowManager（8790）：在android. view。查看$PerformClick. run（View. java： 16987）06-05 13:23:52.309：E/WindowManager（8790）：在android. os。Handler. handleCallback（Handler. java： 615）06-05 13:23:52.309：E/WindowManager（8790）：在android. os。Handler。调度消息（Handler. java： 92）06-05 13:23:52.309：E/WindowManager（8790）：在android. os。Looper. loop（Loper. java：方法。调用（方法。java： 511）06-05 13:23:52.309：E/WindowManager（8790）：在com. android. interal. os。ZygoteInit$MESTodAndArgsCaller. run（ZygoteInit. java： 789）06-05 13:23:52.309：E/WindowManager（8790）：在com. android. interal. os。ZygoteInit. main（ZygoteInit. java： 556）06-05 13:23:52.309：E/WindowManager（8790）：在dalvik. system。NativeStart. main（本机方法）

Answer 1

去除

customGridAdapter = new GridViewAdapter(this, R.layout.row_grid, contactList);
gridView.setAdapter(customGridAdapter);

从创建（Bundle savedInstanceState）{。和

gridView = (GridView) findViewById(R.id.gridView);

从onPostExecute（...）旁边初始化gridView=（GridView）findViewById（R.id.gridView）；之前

new GetContacts().execute();

Answer 2

返回您的原始代码，该代码使用空联系人列表设置网格适配器。这将消除空指针异常。在GridViewAdapter中添加一个名为callNotifyDataChanged的方法。java和下面的代码。

public void callNotifyDataChanged() {
    notifyDataSetChanged();
}

在GetContacts中。onPostExecute方法，在再次设置适配器后调用此方法。

@Override
protected void onPostExecute(final ArrayList<HashMap<String, String>> result) {
    super.onPostExecute(result);
....
....



customGridAdapter.callNotifyDataChanged() ;

理想情况下，您不必重新创建适配器并再次进行设置。您应该只更改适配器中的数据，并重用同一适配器。但首先，试试我的建议，看看是否有效。

祝你好运