让ListviewActivity性能更流畅android

我有一个SearchListActivity，它使用CustomSimpleCursor作为适配器。在这种CustomSimpleCursor我用很多代码的操作，原因在于SearchListActivity的表现已经到了bacause其中它滚动让ListviewActivity性能更流畅android

时挂起的水平SearchListActivity有

三ImageView的，其中，一-animates上滚动
13 TextView的

请帮助我，如何改变SearchListActivity，使性能提高

CustomSimpleCursor.java

public class CustomSimpleCursor extends SimpleCursorAdapter{ 

    Typeface font; 
    TextView txtDaysRemainigValue,txtTurnsAge; 

    @SuppressWarnings("deprecation") 
    public CustomSimpleCursor(Context context, int layout, Cursor c, 
      String[] from, int[] to) { 
     super(context, layout, c, from, to); 
    } 
    @Override 
    public void bindView(View view, Context context, Cursor cursor) { 
      super.bindView(view, context, cursor);    

      String todayBD = null; 
      //Zodiac icon 
      try { 
        ImageView thumbZodiacIcon = (ImageView) view.findViewById(R.id.ImageView01); 
        InputStream bitmap = context.getResources().getAssets().open(cursor.getString(cursor.getColumnIndexOrThrow(BirthdayProvider.ZODIAC_ICON))); 
        Bitmap bit = BitmapFactory.decodeStream(bitmap); 
        thumbZodiacIcon.setImageBitmap(bit); 

      } catch (Exception e1) { 
        e1.printStackTrace(); 
      } 

     // Event icon 
      try { 
        ImageView thumbEventIcon = (ImageView) view.findViewById(R.id.ImageView02); 
        InputStream bitmap = context.getResources().getAssets().open(cursor.getString(cursor.getColumnIndexOrThrow(BirthdayProvider.EVENT_ICON))); 
        Bitmap bit = BitmapFactory.decodeStream(bitmap); 
        thumbEventIcon.setImageBitmap(bit); 

      } catch (Exception e1) { 
        e1.printStackTrace(); 
      } 


      //Contact photo 
      try { 
       ImageView thumbContact = (ImageView) view.findViewById(R.id.list_image); 
       byte bitmapData[]=cursor.getBlob(cursor.getColumnIndex(BirthdayProvider.PHOTO)); 
       Bitmap bit = BitmapFactory.decodeByteArray(bitmapData, 0, bitmapData.length); 
       thumbContact.setImageBitmap(bit);    
       Animation localAnimation = AnimationUtils.loadAnimation(context,R.anim.fadein_image); 
       thumbContact.startAnimation(localAnimation); 

     } catch (Exception e1) { 
       e1.printStackTrace(); 
     } 

     //Days remaining for BD 

     txtDaysRemainigValue=(TextView)view.findViewById(R.id.txtview_days_left);    
     String year=cursor.getString(cursor.getColumnIndex(BirthdayProvider.EVENT_YEAR)); 
     String month=cursor.getString(cursor.getColumnIndex(BirthdayProvider.EVENT_MONTH)); 
     String date=cursor.getString(cursor.getColumnIndex(BirthdayProvider.EVENT_DATE)); 
     String remainingDays=BirthdayCalculation.getDaysRemainingForNextBirthDay(year, month, date); 

      Calendar today=Calendar.getInstance(); 
      int CMonth=(today.get(Calendar.MONDAY)+1); 
      int CDate=(today.get(Calendar.DAY_OF_MONTH)); 


      txtDaysRemainigValue.setTextColor(Color.parseColor("#990000")); 
      txtDaysRemainigValue.setTextSize(TypedValue.COMPLEX_UNIT_SP, 27); 

      //checking whether the BD is on TODAY 

      if (remainingDays.equals("1") && (CDate==Integer.parseInt(date) && (CMonth)==Integer.parseInt(month))) { 

       Log.v("else if executed","else if executed"); 
       Log.v("Remainin Days",remainingDays+" = Custom month"+cursor.getString(cursor.getColumnIndex(BirthdayProvider.NAME))+"="+(CMonth)+"="+month); 
      Log.v("Remainin Days",remainingDays+" = Custom date"+ cursor.getString(cursor.getColumnIndex(BirthdayProvider.NAME))+"="+CDate+"="+date); 
       txtDaysRemainigValue.setTextSize(TypedValue.COMPLEX_UNIT_SP, 20); 
       txtDaysRemainigValue.setTextColor(Color.parseColor("#00CC33")); 
      remainingDays="today".toLowerCase(); 
     } 

      //checking whether the BD is on TOMORROW 
      else if (remainingDays.equals("1")) { 

      Log.v("Remainin Days",remainingDays+" = Custom month"+cursor.getString(cursor.getColumnIndex(BirthdayProvider.NAME))+"="+(CMonth)+"="+month); 
      Log.v("Remainin Days",remainingDays+" = Custom date"+ cursor.getString(cursor.getColumnIndex(BirthdayProvider.NAME))+"="+CDate+"="+date); 
       txtDaysRemainigValue.setTextSize(TypedValue.COMPLEX_UNIT_SP, 17); 
       txtDaysRemainigValue.setTextColor(Color.parseColor("#FFFF00")); 
      remainingDays="tomorrow".toLowerCase(); 
     } 


     //checking how many days remaining BD 
      else{ 
       remainingDays=BirthdayCalculation.getDaysRemainingForNextBirthDay(year, month, date); 
       txtDaysRemainigValue.setTextSize(TypedValue.COMPLEX_UNIT_SP, 27); 
       txtDaysRemainigValue.setTextColor(Color.parseColor("#990000")); 

      } 

      txtDaysRemainigValue=(TextView)view.findViewById(R.id.txtview_days_left);  
      font=Typeface.createFromAsset(context.getAssets(), "DS_DIGIB.ttf"); 
      txtDaysRemainigValue.setTypeface(font);    
      txtDaysRemainigValue.setText(remainingDays); 

     //Turns age 
     txtTurnsAge=(TextView)view.findViewById(R.id.txtview_turns);   
     String turnsAge=BirthdayCalculation.getAge(Integer.parseInt(year),Integer.parseInt(month),Integer.parseInt(date)); 
     txtTurnsAge.setText(turnsAge); 


     //Event week 
     try { 

      TextView txtEventWeek=(TextView)view.findViewById(R.id.txtview_next_bd);  
      String eventWeek=BirthdayCalculation.getDayOfWeek(year, month, date); 
      font=Typeface.createFromAsset(context.getAssets(), "Comic Sans.ttf"); 
      txtEventWeek.setTypeface(font); 
      txtEventWeek.setText(eventWeek); 

     } catch (Exception e) { 
      e.printStackTrace(); 
     } 



     // Contact Name 

     TextView txtNumber=(TextView)view.findViewById(R.id.sub_title_contact_number); 
     font=Typeface.createFromAsset(context.getAssets(), "Roboto_Light.ttf"); 
     txtNumber.setTypeface(font); 

     TextView txtBirtgDay=(TextView)view.findViewById(R.id.sub_title_birthdate); 
     font=Typeface.createFromAsset(context.getAssets(), "Roboto_Light.ttf"); 
     txtBirtgDay.setTypeface(font); 


     TextView txtZodiac=(TextView)view.findViewById(R.id.TextView02); 
     font=Typeface.createFromAsset(context.getAssets(), "Roboto_Light.ttf"); 
     txtZodiac.setTypeface(font); 

     TextView txtZodiacValue=(TextView)view.findViewById(R.id.txtview_zodiac); 
     font=Typeface.createFromAsset(context.getAssets(), "Comic Sans.ttf"); 
     txtZodiacValue.setTypeface(font); 


     TextView txtNextBD=(TextView)view.findViewById(R.id.TextView01); 
     font=Typeface.createFromAsset(context.getAssets(), "Roboto_Light.ttf"); 
     txtNextBD.setTypeface(font); 


     TextView txtTurnsAge=(TextView)view.findViewById(R.id.list_image_arrow); 
     font=Typeface.createFromAsset(context.getAssets(), "athletic.ttf"); 
     txtTurnsAge.setTypeface(font); 

     TextView txtDayRemainig=(TextView)view.findViewById(R.id.TextView04);  
     font=Typeface.createFromAsset(context.getAssets(), "athletic.ttf"); 
     txtDayRemainig.setTypeface(font); 

     TextView txtTurnsAgeValue=(TextView)view.findViewById(R.id.txtview_turns);  
     font=Typeface.createFromAsset(context.getAssets(), "DS_DIGIB.ttf"); 
     txtTurnsAgeValue.setTypeface(font); 

    } 
}

来源

2014-01-14 karthik

你应该使用[Picasso]（http://square.github.io/picasso）库在后台线程中延迟加载图像并缓存它们。 – corsair992

有一件事你应该做的是使用TAG与静态类和属性，例如：

class CustomAdapter extends BaseAdapter { 

    List<Car> cars; 
    private LayoutInflater mInflater; 

    public CustomAdapter(List<Car> cars) { 
     this.cars = cars; 
     mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    } 

    @Override 
    public View getView(int i, View view, ViewGroup viewGroup) { 
     Car car = getItem(i); 
     CarViewHolder carViewHolder; 
     if (view == null || view.getTag() == null) { 
      view = mInflater.inflate(R.layout.listview_item_car, viewGroup, false); 
      carViewHolder = new CarViewHolder(); 
      carViewHolder.mainLayout = (LinearLayout) view; 
      carViewHolder.factoryTV = (TextView) carViewHolder.mainLayout.findViewById(R.id.factoryTV); 
      carViewHolder.kmTV = (TextView) carViewHolder.mainLayout.findViewById(R.id.kmTV); 
      carViewHolder.nameTV = (TextView) carViewHolder.mainLayout.findViewById(R.id.nameTV); 
      carViewHolder.yearTV = (TextView) carViewHolder.mainLayout.findViewById(R.id.yearTV); 
     } else { 
      carViewHolder = (CarViewHolder) view.getTag(); 
     } 

     carViewHolder.factoryTV.setText(car.getFabricante()); 
     carViewHolder.kmTV.setText(NumberFormat.getInstance().format(car.getQuilometragem()).toString()); 
     carViewHolder.nameTV.setText(String.valueOf(car.getNome())); 
     carViewHolder.yearTV.setText(String.valueOf(car.getAno())); 

     view.setTag(carViewHolder); 
     return view; 
    } 

    @Override 
    public Car getItem(int i) { 
     return cars.get(i); 
    } 

    @Override 
    public long getItemId(int i) { 
     return cars.indexOf(i); 
    } 

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

static class CarViewHolder { 
    LinearLayout mainLayout; 
    TextView nameTV; 
    TextView factoryTV; 
    TextView yearTV; 
    TextView kmTV; 
}

来源

2014-01-14 17:07:26 Helio

让ListviewActivity性能更流畅android

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