Android ProgressBar NPE

Question

Ciao，stòcercando di visualizzare una ProgressBar per ogni riga della listview。 Hoest NPE in questa riga di codice：mProgress.setProgress(0); 似乎沒有找到ProgressBar。我在onCreate（）中初始化PreogressBar。感謝您的幫助

ListAdapter adapter = new ArrayAdapter<Dettaglio>(this, R.layout.dettaglio, R.id.tv_totale_group, dettagli){ 

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

          TextView tvEn, tvCaa, tvPer; 
          tvEn = (TextView) row.findViewById(R.id.tv_to_group); 
          tvCaa = (TextView) row.findViewById(R.id.tv_cat_group); 
          tvPer = (TextView) row.findViewById(R.id.tv_perc_cat);  
          ProgressBar mProgress; 
       mProgress = (ProgressBar) findViewById(R.id.progress_e); 
          mProgress.setProgress(0); 
          mProgress.setMax(100); 



          Dettaglio d = dettagli.get(position); 

          tvCaa.setText(d.categorie+""); 

          double value = Double.valueOf(d.en); 
          NumberFormat formatter = NumberFormat.getCurrencyInstance(); 
          String en = formatter.format(value); 
          tvEn.setText(en+""); 

          //percent------------------------- 
          double totaleE = 0; 
          for (Dettaglio c : dettagli){ 
            totaleE += c.en; 
          } 

          value = d.en/totaleE *100;          

          DecimalFormat decimalFormat = new DecimalFormat("0.#"); 
          String en1 = decimalFormat.format(value); 
          tvPer.setText(en1+"%"); 

          //----PROGRESS BAR---------------------------------------- 

          int valore_per_barra = (int) Math.floor(value); 

          mProgress.setProgress(valore_per_barra); 


          return row; 
        } 
      }; 

      lista.setAdapter(adapter); 

Answer 1

初始化進度的listAdapter內，而不是你的OnCreate