Android自定义ListView刷新问题

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我目前正在研究一个具有MainActivity的Android应用程序，它是一个NavigationDrawer，因此该应用程序的每个屏幕均作为一个Fragment实现。Android自定义ListView刷新问题

每个片段这里实例：

public class PlaceholderFragment extends Fragment { 

    private final String TAG = "Dhemage"; 
    public TextView curr_money_txt; 

    public PlaceholderFragment() { 
    } 

    /** 
    * The fragment argument representing the section number for this 
    * fragment. 
    */ 
    private static final String ARG_SECTION_NUMBER = "section_number"; 

    /** 
    * Returns a new instance of this fragment for the given section 
    * number. 
    */ 
    public static PlaceholderFragment newInstance(int sectionNumber) { 
     PlaceholderFragment fragment = new PlaceholderFragment(); 
     Bundle args = new Bundle(); 
     args.putInt(ARG_SECTION_NUMBER, sectionNumber); 
     fragment.setArguments(args); 
     return fragment; 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     int sectionNumber = this.getArguments().getInt(ARG_SECTION_NUMBER); 
     View rootView; 

     switch (sectionNumber) { 
      case 1: 
       rootView = inflater.inflate(R.layout.home, container, false); 
       break; 
      case 2: 
       rootView = inflater.inflate(R.layout.activity_recursos, container, false); 

       /*CREATE Money TXT*/ 
       curr_money_txt = (TextView) rootView.findViewById(R.id.curr_money_text); 
       curr_money_txt.setText(((navigation_bar) getActivity()).START_MONEY); 

       /*CREATE LIST VIEW*/ 
       List<String> nomes_recursos = Arrays.asList("Iron", "Silver", "Gold", "Painite", "Benitoite", "Deuterium"); 
       ListAdapter recursosAdapter = new Recurso_ListViewItens(getActivity(), R.layout.recurso_box_fragment, nomes_recursos); 
       ListView recursos_ListView = (ListView) rootView.findViewById(R.id.recursos_listview); 
       recursos_ListView.setAdapter(recursosAdapter); 

       break; 
      case 3: 
       rootView = inflater.inflate(R.layout.fragment_navigation_bar, container, false); 
       break; 
      default: 
       rootView = inflater.inflate(R.layout.fragment_navigation_bar, container, false); 
       break; 
     } 


     return rootView; 
    } 


    @Override 
    public void onAttach(Activity activity) { 
     super.onAttach(activity); 
     ((navigation_bar) activity).onSectionAttached(getArguments().getInt(ARG_SECTION_NUMBER)); 
    } 
}

目前我执行的情况下2.由一组聚集在与显示在顶部货币文本字段一个ListView一个资源英寸

与ListView一起使用的apdater代码如下。我想唯一重要的部分是getView方法。反正我张贴全班

public class Recurso_ListViewItens extends ArrayAdapter<String> { 


private int layout; 
private Context context; 

public Recurso_ListViewItens(Context _context, int resource, List<String> objects) { 
    super(_context, resource, objects); 
    layout = resource; 
    this.context = _context; 

} 


@Override 
public View getView(final int position, View convertView, final ViewGroup parent) { 
    // reuse views 
    if (convertView == null) { 
     //Inflate View 
     LayoutInflater fragmentInflater = LayoutInflater.from(getContext()); 
     convertView = fragmentInflater.inflate(R.layout.recurso_box_fragment, parent, false); 

     //Create the viewHolder 
     final ViewHolder viewHolder = new ViewHolder(); 

     //configure the viewholder 
     viewHolder.textoPreco = (TextView) convertView.findViewById(R.id.countdown); 
     viewHolder.texto_level_recurso = (TextView) convertView.findViewById(R.id.level_of_resource); 
     viewHolder.imageRecurso = (ImageView) convertView.findViewById(R.id.imagem_recurso); 
     viewHolder.getmoneyButton = (Button) convertView.findViewById(R.id.button_recurso_fragment); 
     viewHolder.upgradeButton = (Button) convertView.findViewById(R.id.upg_butt_recurso_fragment); 
     viewHolder.curr_money_link = (TextView) ((navigation_bar) getContext()).findViewById(R.id.curr_money_text); 

     //UPGRADE BUTTON 
     viewHolder.upgradeButton.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       upg_button_action(viewHolder,position); 

      } 
     }); 

     //GET MONEY 
     viewHolder.getmoneyButton.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       getmoney_action(viewHolder,position); 

      } 
     }); 

     //set tag 
     convertView.setTag(viewHolder); 

     Log.d("Dhemage","Entered if: position="+position+" tag="+convertView.getTag().toString()+"\n"); 
    } 

    Log.d("Dhemage","Entered if: position="+position+" tag="+convertView.getTag().toString()+"\n"); 

    //fill data 
    final ViewHolder holder = (ViewHolder) convertView.getTag(); 

    holder.initial_variable_set(position); 

     switch (position) { 
      case 0: holder.imageRecurso.setImageResource(R.mipmap.resource_iron);break; 
      case 1: holder.imageRecurso.setImageResource(R.mipmap.resource_silver);break; 
      case 2: holder.imageRecurso.setImageResource(R.mipmap.resource_gold);break; 
      case 3: holder.imageRecurso.setImageResource(R.mipmap.resource_painite);break; 
      case 4: holder.imageRecurso.setImageResource(R.mipmap.resource_benitoite);break; 
      case 5: holder.imageRecurso.setImageResource(R.mipmap.resource_deuterium);break; 
     } 


    return convertView; 
} 


public class ViewHolder { 
    //WIDGETS ON FRAGMENT 
    TextView textoPreco; 
    TextView texto_level_recurso; 
    ImageView imageRecurso; 
    Button getmoneyButton; 
    Button upgradeButton; 
    TextView curr_money_link; 
    boolean initial_set_required = true; 

    public void initial_variable_set(int position) { 
     if(initial_set_required) { 
      //SET initial INFORMATION ON WIDGET 
      this.texto_level_recurso.setId(position); 
      this.upgradeButton.setText("1"); 
      this.getmoneyButton.setText(getItem(position));// getItem(position) = mineral name 
      this.initial_set_required = false; 
     } 
    } 

} 


private void getmoney_action(ViewHolder viewHolder, int position) { 
    //get resource level 
    String niveltxt = viewHolder.texto_level_recurso.getText().toString(); 
    int level = Integer.parseInt(niveltxt); 

    //get money on click 
    int money_to_add = money_per_click(level, position); 

    //get current money 
    int curr_money = getCurrentMoney(viewHolder); 


    //sets money value 
    curr_money+=money_to_add; 
    viewHolder.curr_money_link.setText(String.valueOf(curr_money)); 

} 

private int money_per_click(int level, int position) { 
    int next_price; 
    switch (position) { 
     case 0: 
      next_price = (int) (level + 1); 
      break; 
     case 1: 
      next_price = (int) (level * 1.8 + 1); 
      break; 
     case 2: 
      next_price = (int) (level * 2.5); 
      break; 
     case 3: 
      next_price = (int) (level * 3); 
      break; 
     case 4: 
      next_price = (int) (level * 4.5); 
      break; 
     case 5: 
      next_price = (int) (level * 8); 
      break; 
     default: 
      return 0; 
    } 

    return next_price; 
} 


private boolean upg_button_action(ViewHolder viewHolder,int position){ 
    //gets ugrade price 
    String precotxt = viewHolder.upgradeButton.getText().toString(); 
    int curr_upg_price = Integer.parseInt(precotxt); 

    //get current money 
    int curr_money = getCurrentMoney(viewHolder); 

    //check if got money to pay 
    if (curr_money > curr_upg_price) { 
     //pays the upgrade 
     curr_money = curr_money - curr_upg_price; 
     viewHolder.curr_money_link.setText(String.valueOf(curr_money)); 
     //level icon increments 
     String niveltxt = viewHolder.texto_level_recurso.getText().toString(); 
     int lvl = Integer.parseInt(niveltxt); 
     lvl++; 
     viewHolder.texto_level_recurso.setText(String.valueOf(lvl)); 

     //increses price of upgrade 
     int next_price = next_upgrade_price(position, curr_upg_price); 
     viewHolder.upgradeButton.setText(String.valueOf(next_price)); 

     return true; 
    } 
    return false; 
} 

private int object_text_to_int(Button object){ 
    //gets ugrade price 
    String object_text = object.getText().toString(); 
    int value = Integer.parseInt(object_text); 
    return value ; 
} 

private int object_text_to_int(TextView object){ 
    //gets ugrade price 
    String object_text = object.getText().toString(); 
    int value = Integer.parseInt(object_text); 
    return value ; 
} 

//button upgrade pressed 
//returns 0 if error occurs 
public int next_upgrade_price(int position, int curr_price) { 
    int next_price; 
    switch (position) { 
     case 0: 
      next_price = (int) (curr_price * 1.5 + 1); 
      break; 
     case 1: 
      next_price = (int) (curr_price * 2 + 1); 
      break; 
     case 2: 
      next_price = (int) (curr_price * 2.5); 
      break; 
     case 3: 
      next_price = (int) (curr_price * 2.7); 
      break; 
     case 4: 
      next_price = (int) (curr_price * 3); 
      break; 
     case 5: 
      next_price = (int) (curr_price * 5); 
      break; 
     default: 
      return 0; 
    } 

    return next_price; 
} 

//get current money 
private int getCurrentMoney(ViewHolder viewHolder) { 
    String curr_money_txt = viewHolder.curr_money_link.getText().toString(); 
    int curr_money = Integer.parseInt(curr_money_txt); 
    return curr_money; 
}

}

我读过这个线程：Android Custom Listview，但我看到它我prolem去agaisnt大约位置/视野的逻辑在那里解释。

我的问题是：如果我上下滚动，按钮上的文本加上资源的lvls开始改变。如果在调用此方法时代码向我显示位置正确，但标记和convertView对于给定位置错误，则会看到Log.d。

任何想法为什么发生这种情况？任何想法如何解决它没有蛮力（如重建给定位置的视图）。

在此先感谢您的帮助。 :) :) :)

来源

2015-08-09 Dário Pedro

的可能重复[ListView的重用视图时......我不希望它（http://stackoverflow.com/questions/6921462/listview-当我不想要它） –

仍然，我使用的.setTag和.getTag的概念，并获得错误的观点，给定的位置。 –

对，但是对于每个列表项内部的项目，您需要在getView中设置所需的默认状态，否则当其他列表项重用时可能会混淆 –

试试这个;

ViewHolder viewHolder= new ViewHolder(); 
if (convertView==nul){ 
    //your stuff 

    convertView.settag(viewholder); 
}else{ 
    viewHolder= convertView.getTag(viewHolder); 
} 


//your code stuff 
ButtonName.setText=ChangingArray[position]

然后你应该改变你的按钮。

实现onChangeStateListener与changingArray（应该是场）

来源

2015-08-09 01:07:51 Kaloglu

Android自定义ListView刷新问题

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