Question

我有一个listview适配器，我用json响应填充。响应变得很好但是当我设置适配器时，app会抛出一个错误。

带有getter和setter的类：

  public class puntos {
  protected String name;
  protected int punto;
  protected String data;
  protected int nametwo;
  protected   Bitmap photo;


  public puntos(String name, int punto, int nametwo) {
    this.name = name;
    this.punto = punto;
    this.nametwo = nametwo;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }
  public int getNametwo() {
        return nametwo;
      }

      public void setNametwo(int nameTwo) {
        this.nametwo = nameTwo;
      }

  public int getPunto() {
    return punto;
  }

  public void setPunto(int punto) {
    this.punto = punto;
  }

  public String getData() {
    return data;
  }

  public void setData(String data) {
    this.data = data;
    try {   
      byte[] byteData = Base64.decode(data, Base64.DEFAULT);
      this.photo = BitmapFactory.decodeByteArray( byteData, 0, byteData.length);
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }

  public Bitmap getPhoto() {
    return photo;
  }
}

类适配器

public class puntosAdapter extends BaseAdapter {
  protected Activity activity;
  protected ArrayList<puntos> items;

  public puntosAdapter(Activity activity, ArrayList<puntos> items) {
    this.activity = activity;
    this.items = items;
  }

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

  @Override
  public Object getItem(int position) {
    return items.get(position);
  }

  @Override
  public long getItemId(int position) {
    return items.get(position).getNametwo();
  }

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


      LayoutInflater inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
      vi = inflater.inflate(R.layout.list_item_layout, null);


    puntos punt = items.get(position);

    ImageView image = (ImageView) vi.findViewById(R.id.pImage);
    image.setImageBitmap(punt.getPhoto());

    TextView name = (TextView) vi.findViewById(R.id.pName);
    name.setText(punt.getName());

    //TextView punto = (TextView) vi.findViewById(R.id.pPunto);
    //punto.setText(punt.getPunto());
    return vi;
  }
}

assectask with httppost response

 class puntuar extends AsyncTask<Void, Void, Void>{
     String txt;
        @Override
        protected Void doInBackground(Void... params) {
             try {
                 HttpClient httpclient = new DefaultHttpClient();
                          HttpPost httppost = new HttpPost("http://comupunt.esy.es/puntos.php");
                          List<NameValuePair> parame = new ArrayList<NameValuePair>();
                         parame.add(new BasicNameValuePair("jug1", Integer.toString(1)));
                         parame.add(new BasicNameValuePair("jug2", Integer.toString(2)));
                          httppost.setEntity(new UrlEncodedFormEntity(parame));
                          HttpResponse resp = httpclient.execute(httppost);
                          HttpEntity ent = resp.getEntity();

                    txt = EntityUtils.toString(ent);
                    JSONObject jsonObject = new JSONObject(txt);
                    JSONArray cities = jsonObject.getJSONArray("cities");                 
                    for(int i = 0; i < cities.length(); i++) 
                     {
                        JSONObject city = cities.getJSONObject(i);
                        puntos c = new puntos(city.getString("name"), city.getInt("punto"), city.getInt("nametwo"));
                        c.setData(city.getString("photo"));
                        citiesAvaiable.add(c);
                        Log.d("error", String.valueOf(c.punto));
                     }
                 }catch(Exception e) {                
                    e.printStackTrace();
                    }
                    return null;
        }

        protected void onPostExecute(Void result) {
            try{
            puntosAdapter puntosAdapter = new puntosAdapter(puntosClass.this, citiesAvaiable);
            lv1.setAdapter(puntosAdapter);
                super.onPostExecute(result);
            }catch(Exception e)
            {
                e.printStackTrace();
            }
        }
    }

和错误日志

FATAL EXCEPTION: main
12-15 01:47:00.267: E/AndroidRuntime(5501): java.lang.NullPointerException
12-15 01:47:00.267: E/AndroidRuntime(5501):     at  
  com.example.images.puntosAdapter.getView(puntosAdapter.java:50)
 12-15 01:47:00.267: E/AndroidRuntime(5501):    at  
android.widget.AbsListView.obtainView(AbsListView.java:2267)
 E/AndroidRuntime(5501):    at 
android.widget.ListView.makeAndAddView(ListView.java:1769)
E/AndroidRuntime(5501):     at     
 android.widget.ListView.fillDown(ListView.java:672)
 E/AndroidRuntime(5501):    at    
android.widget.ListView.fillFromTop(ListView.java:733)
 E/AndroidRuntime(5501):    at    
android.widget.ListView.layoutChildren(ListView.java:1622)
 E/AndroidRuntime(5501):    at
android.widget.AbsListView.onLayout(AbsListView.java:2102)
 E/AndroidRuntime(5501):    at android.view.View.layout(View.java:13754)
 E/AndroidRuntime(5501):    at android.view.ViewGroup.layout(ViewGroup.java:4362)
 E/AndroidRuntime(5501):    at 
 android.widget.LinearLayout.setChildFrame(LinearLayout.java:1649)    
  E/AndroidRuntime(5501):   at   
  android.widget.LinearLayout.layoutVertical(LinearLayout.java:1507)
  E/AndroidRuntime(5501):   at 
  android.widget.LinearLayout.onLayout(LinearLayout.java:1420)
  E/AndroidRuntime(5501):   at android.view.View.layout(View.java:13754)
  E/AndroidRuntime(5501):   at android.view.ViewGroup.layout(ViewGroup.java:4362)
  E/AndroidRuntime(5501):   at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
  E/AndroidRuntime(5501):   at android.view.View.layout(View.java:13754)
  E/AndroidRuntime(5501):   at android.view.ViewGroup.layout(ViewGroup.java:4362)
   E/AndroidRuntime(5501):  at 
  android.widget.LinearLayout.setChildFrame(LinearLayout.java:1649)
   E/AndroidRuntime(5501):  at 
   android.widget.LinearLayout.layoutVertical(LinearLayout.java:1507)
   E/AndroidRuntime(5501):  at 
   android.widget.LinearLayout.onLayout(LinearLayout.java:1420)
   E/AndroidRuntime(5501):  at android.view.View.layout(View.java:13754)
   E/AndroidRuntime(5501):  at android.view.ViewGroup.layout(ViewGroup.java:4362)
   E/AndroidRuntime(5501):  at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
    E/AndroidRuntime(5501):     at android.view.View.layout(View.java:13754)
   E/AndroidRuntime(5501):  at android.view.ViewGroup.layout(ViewGroup.java:4362)
   E/AndroidRuntime(5501):  at 
   android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1866)
   E/AndroidRuntime(5501):  at
   android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1687)
   E/AndroidRuntime(5501):  at 
   android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:998)
   E/AndroidRuntime(5501):  at 
   android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4212)
   E/AndroidRuntime(5501):  at 
   android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
   E/AndroidRuntime(5501):  at 
   android.view.Choreographer.doCallbacks(Choreographer.java:555)
    E/AndroidRuntime(5501):     at 
    android.view.Choreographer.doFrame(Choreographer.java:525)
   E/AndroidRuntime(5501):  at 
   android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
   E/AndroidRuntime(5501):  at android.os.Handler.handleCallback(Handler.java:615)
   E/AndroidRuntime(5501):  at android.os.Handler.dispatchMessage(Handler.java:92)
   E/AndroidRuntime(5501):  at android.os.Looper.loop(Looper.java:137)
   E/AndroidRuntime(5501):  at android.app.ActivityThread.main(ActivityThread.java:4745)
   E/AndroidRuntime(5501):  at java.lang.reflect.Method.invokeNative(Native Method)
    E/AndroidRuntime(5501):     at java.lang.reflect.Method.invoke(Method.java:511)
   E/AndroidRuntime(5501):  at 
   com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
   E/AndroidRuntime(5501):  at    
   com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
    E/AndroidRuntime(5501):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

因为你使用错误的方式来扩充布局。

删除`

vi = inflater.inflate(R.layout.list_item_layout, null);

=

vi = inflater.inflate(R.layout.list_item_layout,parent,false);

Answer 2

好吧，我发现了问题，我正在调用“list_item_layout”并且我的新listview的布局是“lis_item2”，这是因为我复制了其他的方法。谢谢！对不起

listview适配器出错

2 个答案: