Android listview和Performance中的3个支架

我有三张票。1件物品1个支架。 方法getView看起来：

public View getView(int position, View convertView, ViewGroup parent) {
    mCursor.moveToPosition(position);
    int type = checkDialogType(mCursor);
    Holder holder = null;
    if (convertView != null){
        holder = (Holder)convertView.getTag(type);
        if (holder == null){
            holder = createHolderByType(type, parent);
        }
    } else {
        holder = createHolderByType(type, parent);
    }
    return holder.fillView(mCursor, position);         //convertView
}

其中createHolderByType（）的内容：

它可以正常工作，但对于listView中的39个项，createHolderByType方法被调用了19次。为了创建一个支架，我需要膨胀xml。它很贵。若我尝试使用相同的视图来保存或将保存在内存中，那个么它是不起作用的。我可以用一些技巧来提高性能吗

UPD: 有一个持有人：

public class InHolder extends Holder {
private View baseView;
private TextView fio;
private TextView message;
private TextView date;
private ImageView isOnline;
private int type;
private ImageView senderIMG;

public InHolder(View v, Cursor dialogCursor, Context context, DialogCurAdapter adapter, int type){
    super(dialogCursor, context, adapter);
    fio = (TextView)v.findViewById(R.id.fio);
    senderIMG = (ImageView)v.findViewById(R.id.sender_image);
    message = (TextView)v.findViewById(R.id.message_preview);
    date = (TextView)v.findViewById(R.id.date);
    isOnline = (ImageView)v.findViewById(R.id.isonline);
    this.type= type;
    baseView = v;
    baseView.setTag(type, this);
}

@Override
public View fillView(Cursor dialogCursor, final int position) {
    try{
        int ownerID = dialogCursor.getInt(ownerIndex);
        User usr = mDButils.getUserByID(ownerID);
        String messageText = Html.fromHtml(dialogCursor.getString(bodyIndex)).toString();
        date.setText(DateUtils.getTime(dialogCursor.getInt(dateIndex), mContext));
        message.setText(messageText);

        if (messageText == null || messageText.equals("")){
            if (dialogCursor.getInt(hasAttIndex) == 1){
                message.setText(mContext.getResources().getString(R.string.attachment));
                message.setTextColor(getColor(R.color.date_blue_to_white_selector));
            }

        }

        if (dialogCursor.getInt(hasAttIndex)  == 1){
            String[] attaches = dialogCursor.getString(attTypeIndex).split(",");
        }

        if (dialogCursor.getInt(readstateIndex) == 0){
            baseView.setBackgroundDrawable(getDrawable(R.drawable.lightblue_to_transparent_selector));
        } else baseView.setBackgroundDrawable(getDrawable(R.drawable.white_to_blue_selector));

        if (usr != null){
            mImageLoader.displayImage(usr.getImageURL(), senderIMG);
            fio.setText(usr.getFirstName() + " " + usr.getLastName());
            isOnline.setVisibility(usr.isOnLine()  == 1  ? View.VISIBLE : View.INVISIBLE);
        } else {
            AsyncUserLoader userLoader = new AsyncUserLoader(mContext) {
                @Override
                protected void onPostExecute(User user) {
                    if (user != null){
                        mDialogAdapter.updateItem(position);
                    }
                }
            };
            userLoader.execute(Integer.parseInt(ownerID + ""));
        }
    }catch (Exception e){
        e.printStackTrace();
    }
    return baseView;
}

@Override
public int getType() {
    return type;
}
}

---

您可以为BaseAdapter实现多个布局，如和中所示

---

注意：在getItemViewType（int位置）中，可以使用checkDialogType（mCursor）；查找要使用的布局类型。但是getItemViewType（int位置）应该返回0到2之间的值（当计数为3时）。

我找到了一个解决方案。我制作了一个复杂的容器，其中包含了我需要的所有视图。取决于我使它们可见或不可见的视图类型。因此，当convertView与类型不匹配时，我不需要膨胀xml。

是否确实将holder as标记添加到视图中？是的。它位于holder的构造函数内部，fillView返回该特定视图？是的，我发布了一个holder。请参阅upd。在您给出的示例中，我们可以看到以下内容：mInflater.inflate（R.layout.item1，null）；如果型号不匹配，他会给物品充气。我也这么做。我将尝试使用基本适配器

public class InHolder extends Holder {
private View baseView;
private TextView fio;
private TextView message;
private TextView date;
private ImageView isOnline;
private int type;
private ImageView senderIMG;

public InHolder(View v, Cursor dialogCursor, Context context, DialogCurAdapter adapter, int type){
    super(dialogCursor, context, adapter);
    fio = (TextView)v.findViewById(R.id.fio);
    senderIMG = (ImageView)v.findViewById(R.id.sender_image);
    message = (TextView)v.findViewById(R.id.message_preview);
    date = (TextView)v.findViewById(R.id.date);
    isOnline = (ImageView)v.findViewById(R.id.isonline);
    this.type= type;
    baseView = v;
    baseView.setTag(type, this);
}

@Override
public View fillView(Cursor dialogCursor, final int position) {
    try{
        int ownerID = dialogCursor.getInt(ownerIndex);
        User usr = mDButils.getUserByID(ownerID);
        String messageText = Html.fromHtml(dialogCursor.getString(bodyIndex)).toString();
        date.setText(DateUtils.getTime(dialogCursor.getInt(dateIndex), mContext));
        message.setText(messageText);

        if (messageText == null || messageText.equals("")){
            if (dialogCursor.getInt(hasAttIndex) == 1){
                message.setText(mContext.getResources().getString(R.string.attachment));
                message.setTextColor(getColor(R.color.date_blue_to_white_selector));
            }

        }

        if (dialogCursor.getInt(hasAttIndex)  == 1){
            String[] attaches = dialogCursor.getString(attTypeIndex).split(",");
        }

        if (dialogCursor.getInt(readstateIndex) == 0){
            baseView.setBackgroundDrawable(getDrawable(R.drawable.lightblue_to_transparent_selector));
        } else baseView.setBackgroundDrawable(getDrawable(R.drawable.white_to_blue_selector));

        if (usr != null){
            mImageLoader.displayImage(usr.getImageURL(), senderIMG);
            fio.setText(usr.getFirstName() + " " + usr.getLastName());
            isOnline.setVisibility(usr.isOnLine()  == 1  ? View.VISIBLE : View.INVISIBLE);
        } else {
            AsyncUserLoader userLoader = new AsyncUserLoader(mContext) {
                @Override
                protected void onPostExecute(User user) {
                    if (user != null){
                        mDialogAdapter.updateItem(position);
                    }
                }
            };
            userLoader.execute(Integer.parseInt(ownerID + ""));
        }
    }catch (Exception e){
        e.printStackTrace();
    }
    return baseView;
}

@Override
public int getType() {
    return type;
}
}