ListView保存已選框的狀態

Question

我已經在Listview中創建了一個複選框。但是，當我關閉應用程序並重新打開時，它不會保存我列出的項目的狀態。

然而，這並沒有爲我工作，我似乎無法找到一個答案，如何解決這個問題。如果任何人都可以幫助我完成ListAdapter Activty的代碼，如下所示，這將不勝感激。

public class ListAdapter extends BaseAdapter { 
Context ctx; 
LayoutInflater lInflater; 
ArrayList<Product> objects; 

ListAdapter(Context context, ArrayList<Product> products) { 
    ctx = context; 
    objects = products; 
    lInflater = (LayoutInflater) ctx 
      .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
} 

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

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

@Override 
public long getItemId(int position) { 
    return position; 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    View view = convertView; 
    if (view == null) { 
     view = lInflater.inflate(R.layout.item, parent, false); 
    } 

    Product p = getProduct(position); 

    ((TextView) view.findViewById(R.id.tvDescr)).setText(p.name); 
    ((TextView) view.findViewById(R.id.tvPrice)).setText(p.price + ""); 
    ((ImageView) view.findViewById(R.id.ivImage)).setImageResource(p.image); 

    CheckBox cbBuy = (CheckBox) view.findViewById(R.id.cbBox); 
    cbBuy.setOnCheckedChangeListener(myCheckChangList); 
    cbBuy.setTag(position); 
    cbBuy.setChecked(p.box); 
    return view; 
} 

Product getProduct(int position) { 
    return ((Product) getItem(position)); 
} 

ArrayList<Product> getBox() { 
    ArrayList<Product> box = new ArrayList<Product>(); 
    for (Product p : objects) { 
     if (p.box) 
      box.add(p); 
    } 
    return box; 
} 

OnCheckedChangeListener myCheckChangList = new OnCheckedChangeListener() { 
    public void onCheckedChanged(CompoundButton buttonView, 
           boolean isChecked) { 
     getProduct((Integer) buttonView.getTag()).box = isChecked; 
    } 
}; 
} 

我不知道我是否做錯了什麼，或者如果我把它放在錯誤的地方，或者如果整個代碼不正確，在這樣做。

這是已編輯的解決方案使用版本共享偏好：

public class ListAdapter extends BaseAdapter { 
Context ctx; 
LayoutInflater lInflater; 
ArrayList<Product> objects; 

ListAdapter(Context context, ArrayList<Product> products) { 
    ctx = context; 
    objects = products; 
    lInflater = (LayoutInflater) ctx 
      .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
} 

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

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

@Override 
public long getItemId(int position) { 
    return position; 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    View view = convertView; 
    if (view == null) { 
     view = lInflater.inflate(R.layout.item, parent, false); 
    } 

    final Product p = getProduct(position); 

    ((TextView) view.findViewById(R.id.tvDescr)).setText(p.name); 
    ((TextView) view.findViewById(R.id.tvPrice)).setText(p.price + ""); 
    ((ImageView) view.findViewById(R.id.ivImage)).setImageResource(p.image); 

    final CheckBox cbBuy = (CheckBox) view.findViewById(R.id.cbBox); 
    SharedPreferences settings = ctx.getSharedPreferences("data",ctx.MODE_PRIVATE); 
    boolean Checked = settings.getBoolean(p.name, false); 
    cbBuy.setChecked(Checked); 



    cbBuy.setOnCheckedChangeListener(new OnCheckedChangeListener() { 
     @Override 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 
      if(cbBuy.isChecked()==true){ 
       SharedPreferences settings = ctx.getSharedPreferences("data",Context.MODE_PRIVATE); 
       settings.edit().putBoolean(p.name, true).commit(); 
       Toast.makeText(ctx, "You Selected" + p.name, Toast.LENGTH_SHORT).show(); 

      }else{ 
       SharedPreferences settings = ctx.getSharedPreferences("data", Context.MODE_PRIVATE); 
       settings.edit().putBoolean(p.name, false).commit(); 
       Toast.makeText(ctx, "You Deselected" +p.name, Toast.LENGTH_SHORT).show(); 

      } 
     } 
    });{ 

     return view; 

    } 

} 

Answer 1

字段不持久存儲。如果您想在啓動時保留數據，則必須將其保存在關閉狀態並在開始時加載。