滚动android时自定义Listview非常滞后答案

【问题标题】：Custom Listview lags very much while scrolling android滚动android时自定义Listview非常滞后
【发布时间】：2015-12-05 04:41:43
【问题描述】：

我正在开发一个自定义listview，它根据HashMap 数据填充second row 中的number of row

Adapter.java

 @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        LayoutInflater inflater = context.getLayoutInflater();
        itemsData =  hasMap.get(position);
        ViewHolder viewHolder;
        View view = null;
        if (convertView == null) {
            viewHolder = new ViewHolder();
            convertView = inflater.inflate(R.layout.listview_row_storewise_details, null, false);
            viewHolder.txt_building_name = (TextView) convertView.findViewById(R.id.BUILDING);
            viewHolder.txt_tower_name = (TextView) convertView.findViewById(R.id.TOWER);
            viewHolder.txt_flat_number = (TextView) convertView.findViewById(R.id.FLAT_NO);
            viewHolder.txt_order_id = (TextView) convertView.findViewById(R.id.ORDER_NO);
            viewHolder.txt_delivery_time = (TextView) convertView.findViewById(R.id.Datetime);
            viewHolder.txt_grand_total = (TextView) convertView.findViewById(R.id.txt_recurring_total_price5);


            viewHolder.container = (LinearLayout) convertView.findViewById(R.id.container);
            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }
        viewHolder.container.removeAllViews();
        for (int i=0;i<itemsData.size();i++){
            StorewiseDetailsModel test = itemsData.get(i);

            Log.d(TAG," test "+itemsData.get(i).getStore_name());

            view = inflater.inflate(R.layout.storewise_detail_orderrow, null);

            viewHolder.txt_not_vailable = (TextView) view.findViewById(R.id.txt_not_vailable);
            viewHolder.txt_rupee_symbol1 = (TextView) view.findViewById(R.id.txt_recurring_price_sym_qnty);
            viewHolder.txt_rupee_symbol2 = (TextView) view.findViewById(R.id.txt_recurring_price_sym1);
            viewHolder.txt_item_name = (TextView) view.findViewById(R.id.txt_product_name);
            viewHolder.txt_item_size = (TextView) view.findViewById(R.id.txt_product_weight);
            viewHolder.txt_item_quantity = (TextView) view.findViewById(R.id.txt_recurring_total_price_qnty);
            viewHolder.txt_item_total = (TextView) view.findViewById(R.id.txt_recurring_total_price);
            viewHolder.divider = (TextView) view.findViewById(R.id.divider);
            viewHolder.container.addView(view);
            viewHolder.txt_grand_total.setText(test.getTotal());
            viewHolder.txt_building_name.setText(test.getBuilding_name());
            viewHolder.txt_tower_name.setText(test.getTower_name());
            viewHolder.txt_flat_number.setText(test.getFlat_number());
            viewHolder.txt_order_id.setText(test.getOrder_id());
            viewHolder.txt_delivery_time.setText(utilClass.formatDate(test.getDelivery_time()));


            if (test.getIs_available().equals("0")){
                viewHolder.txt_not_vailable.setVisibility(View.VISIBLE);
                viewHolder.txt_item_name.setTextColor(context.getResources().getColor(R.color.red_text));
                viewHolder.txt_item_size.setTextColor(context.getResources().getColor(R.color.red_text));
                viewHolder.txt_item_quantity.setTextColor(context.getResources().getColor(R.color.red_text));
                viewHolder.txt_item_total.setTextColor(context.getResources().getColor(R.color.red_text));
                viewHolder.txt_rupee_symbol1.setTextColor(context.getResources().getColor(R.color.red_text));
                viewHolder.txt_rupee_symbol2.setTextColor(context.getResources().getColor(R.color.red_text));

                viewHolder.txt_item_name.setText(test.getItem_name());
                viewHolder.txt_item_size.setText(test.getItem_size());
                viewHolder.txt_item_quantity.setText(test.getItem_price() + " x" + test.getItem_quantity());
                viewHolder.txt_item_total.setText(test.getItem_total());

            }
            else if (test.getIs_available().equals("1")){
                viewHolder.txt_not_vailable.setVisibility(View.GONE);
                viewHolder.txt_item_name.setTextColor(context.getResources().getColor(R.color.black_text));
                viewHolder.txt_item_size.setTextColor(context.getResources().getColor(R.color.black_text));
                viewHolder.txt_item_quantity.setTextColor(context.getResources().getColor(R.color.black_text));
                viewHolder.txt_item_total.setTextColor(context.getResources().getColor(R.color.black_text));
                viewHolder.txt_rupee_symbol1.setTextColor(context.getResources().getColor(R.color.black_text));
                viewHolder.txt_rupee_symbol2.setTextColor(context.getResources().getColor(R.color.black_text));

                viewHolder.txt_item_name.setText(test.getItem_name());
                viewHolder.txt_item_size.setText(test.getItem_size());
                viewHolder.txt_item_quantity.setText(test.getItem_price() + " x" + test.getItem_quantity());
                viewHolder.txt_item_total.setText(test.getItem_total());
            }
        }
        return convertView;
    }

    class ViewHolder {
        TextView txt_building_name;
        TextView txt_tower_name;
        TextView txt_flat_number;
        TextView txt_order_id;
        TextView txt_delivery_time;
        TextView txt_grand_total;

        TextView txt_item_name;
        TextView txt_item_size;
        TextView txt_item_quantity;
        TextView txt_item_total;
        LinearLayout container;
        TextView divider;
        TextView txt_not_vailable;
        TextView txt_rupee_symbol1,txt_rupee_symbol2;
    }

listview_row_storewise_details.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    >


    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#eeeeee"
        android:paddingTop="10dp"
        android:paddingBottom="10dp"
        android:paddingLeft="15dp"
        android:paddingRight="10dp"
        >

        <RelativeLayout
            android:id="@+id/relativeLayout"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true">

            <com.techmorphosis.Utils.TextViewCustomFont
                android:id="@+id/txt_not_vailable"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="1dp"
                android:text="not available"
                android:visibility="gone"
                android:textColor="#b8b8b8"
                android:drawableLeft="@drawable/ic_not_available"
                android:drawablePadding="5dp"
                android:textSize="@dimen/textsize_large" />

            <com.techmorphosis.Utils.TextViewCustomFont
                android:id="@+id/txt_product_name"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="1dp"
                android:layout_below="@+id/txt_not_vailable"
                android:textSize="@dimen/textsize_large"
                android:textColor="#000000" />

            <com.techmorphosis.Utils.TextViewCustomFont
                android:id="@+id/txt_product_weight"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/txt_product_name"
                android:padding="0dp"
                android:textSize="@dimen/textsize_large"
                android:textColor="#000000"

                />



        </RelativeLayout>


        <RelativeLayout
            android:id="@+id/relative_order_confirm_price"
            android:layout_width="120dp"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_alignBottom="@+id/relativeLayout"
            android:paddingLeft="10dp">

            <LinearLayout
                android:orientation="horizontal"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="right"
                >

                <RelativeLayout
                    android:id="@+id/layoutVoice1"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:layout_weight="0.6"
                    android:layout_gravity="bottom"
                    >



                    <com.techmorphosis.Utils.TextViewCustomFont
                        android:id="@+id/txt_recurring_total_price_qnty"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_toRightOf="@+id/txt_recurring_price_sym_qnty"
                        android:padding="2dp"
                        android:layout_centerVertical="true"
                        android:textSize="@dimen/textsize_large"
                        android:textColor="@color/black_text" />

                    <com.techmorphosis.Utils.TextViewCustomFontBold
                        android:id="@+id/txt_recurring_price_sym_qnty"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:padding="0dp"
                        android:layout_alignParentLeft="true"

                        android:layout_centerVertical="true"
                        android:text="@string/rupees_sym"
                        android:textSize="@dimen/textsize_large"
                        android:textColor="@color/black_text"/>

                </RelativeLayout>
                <View
                    android:id="@+id/view1"
                    android:background="@color/uiv3_divider_color"
                    android:layout_width="1.0dip"
                    android:layout_height="fill_parent"
                    android:layout_marginTop="5dp"

                    android:layout_marginBottom="5dp"
                    />

                <RelativeLayout
                    android:gravity="left"
                    android:id="@+id/layoutScanner1"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:layout_weight="0.6"
                    android:paddingLeft="10dp"
                    >

                    <com.techmorphosis.Utils.TextViewCustomFont
                        android:id="@+id/txt_recurring_total_price"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_alignParentRight="true"
                        android:padding="2dp"
                        android:layout_centerVertical="true"
                        android:textSize="@dimen/textsize_large"
                        android:textColor="@color/black_text" />

                    <com.techmorphosis.Utils.TextViewCustomFontBold
                        android:id="@+id/txt_recurring_price_sym1"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_toLeftOf="@+id/txt_recurring_total_price"
                        android:padding="2dp"
                        android:layout_centerVertical="true"
                        android:text="@string/rupees_sym"
                        android:textSize="@dimen/textsize_large"
                        android:textColor="@color/black_text"/>

                </RelativeLayout>
            </LinearLayout>


        </RelativeLayout>


    </RelativeLayout>


    <View
        android:layout_width="match_parent"
        android:layout_height="0.8dp"
        android:background="#bebebe" />

</LinearLayout>

storewise_detail_orderrow.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="0dp"
        android:orientation="vertical">

        <RelativeLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="#eeeeee"
            android:paddingBottom="10dp"
            android:paddingLeft="15dp"
            android:paddingRight="15dp"
            android:paddingTop="10dp"

            >

            <com.techmorphosis.Utils.TextViewCustomFont
                android:id="@+id/BUILDING"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentLeft="true"
                android:textColor="#5330A8"
                android:textSize="@dimen/textsize_large"

                />

            <com.techmorphosis.Utils.TextViewCustomFont
                android:id="@+id/TOWER"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentLeft="true"
                android:layout_below="@+id/BUILDING"
                android:textColor="#5330A8"

                android:textSize="@dimen/textsize_large" />

            <com.techmorphosis.Utils.TextViewCustomFont
                android:id="@+id/dash"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/BUILDING"
                android:layout_toRightOf="@+id/TOWER"
                android:text="-"
                android:textColor="#5330A8"

                android:textSize="@dimen/textsize_large" />

            <com.techmorphosis.Utils.TextViewCustomFont
                android:id="@+id/FLAT_NO"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/BUILDING"
                android:layout_toRightOf="@+id/dash"
                android:textColor="#5330A8"

                android:textSize="@dimen/textsize_large" />


            <com.techmorphosis.Utils.TextViewCustomFont
                android:id="@+id/ORDER_NO"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_alignParentRight="true"
                android:gravity="right"
                android:textColor="#5330A8"
                android:textSize="@dimen/textsize_large"

                />

            <com.techmorphosis.Utils.TextViewCustomFont
                android:id="@+id/Datetime"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentRight="true"
                android:layout_below="@+id/ORDER_NO"
                android:textColor="#5330A8"
                android:textSize="@dimen/textsize_large" />
        </RelativeLayout>


        <View
            android:layout_width="match_parent"
            android:layout_height="0.8dp"
            android:background="#bebebe" />


        <LinearLayout
            android:id="@+id/container"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical">

        </LinearLayout>


        <LinearLayout
            android:id="@+id/myrow4"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#eeeeee"
            android:orientation="horizontal"
            android:paddingBottom="15dp"

            android:paddingTop="15dp"
            android:weightSum="1"


            >


            <com.techmorphosis.Utils.TextViewCustomFont
                android:layout_width="0.0dip"
                android:layout_height="wrap_content"
                android:layout_weight="0.50"
                android:gravity="center"
                android:textColor="#000000"
                android:textSize="20sp"

                />

            <RelativeLayout
                android:id="@+id/relative_order_confirm_price4"
                android:layout_width="0.0dip"
                android:layout_height="wrap_content"
                android:layout_alignParentRight="true"
                android:layout_weight="0.50"
                android:paddingLeft="10dp"
                android:paddingRight="17dp">

                <com.techmorphosis.Utils.TextViewCustomFont
                    android:id="@+id/txt_recurring_total_price5"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignParentRight="true"
                    android:layout_centerVertical="true"
                    android:padding="2dp"
                    android:text="0"
                    android:textColor="@color/black_text"
                    android:textSize="20sp"

                    />

                <com.techmorphosis.Utils.TextViewCustomFontBold
                    android:id="@+id/txt_recurring_price_sym5"

                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_centerVertical="true"
                    android:layout_toLeftOf="@+id/txt_recurring_total_price5"
                    android:padding="0dp"
                    android:text="@string/rupees_sym"
                    android:textColor="@color/black_text"
                    android:textSize="@dimen/textsize_large" />

                <com.techmorphosis.Utils.TextViewCustomFont
                    android:id="@+id/txt_recurring_total_price_qnty5"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignParentLeft="true"
                    android:layout_centerVertical="true"
                    android:layout_marginLeft="35dp"
                    android:padding="2dp"
                    android:text="TOTAL"
                    android:textColor="@color/black_text"
                    android:textSize="20sp" />

            </RelativeLayout>
        </LinearLayout>
    </LinearLayout>

    <View android:id="@+id/view"
        android:layout_width="match_parent"
        android:layout_height="15dp"
        android:background="@color/white_background"
        />

</LinearLayout>

【问题讨论】：

使用不同的 XML 来扩充行视图，利用列表视图的属性，根据位置具有多个不同的行。目前你正在做的是膨胀所有视图然后设置可见性，这就是你可以看到滚动问题的原因。
对不起。你能更详细一点吗

标签： android listview scroll

【解决方案1】：

嵌套列表不是好的设计理念。

它应该首先列出父项，然后在选择父项时，它应该列出带有页眉和页脚的子项。

如果您想继续这种设计，您可以尝试改用RecyclerView，这比ListView 更有效率。

如果您仍想继续使用ListView，请按如下方式优化列表适配器的getView() 方法，以稍微提高性能。

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    LayoutInflater inflater = context.getLayoutInflater();

    //Make this variable local in methods not need to be global
    itemsData =  hasMap.get(position);

    ViewHolder viewHolder;

    View view = null;

    if (convertView == null) {

        viewHolder = new ViewHolder();

        convertView = inflater.inflate(R.layout.listview_row_storewise_details, null, false);
        viewHolder.txt_building_name = (TextView) convertView.findViewById(R.id.BUILDING);
        viewHolder.txt_tower_name = (TextView) convertView.findViewById(R.id.TOWER);
        viewHolder.txt_flat_number = (TextView) convertView.findViewById(R.id.FLAT_NO);
        viewHolder.txt_order_id = (TextView) convertView.findViewById(R.id.ORDER_NO);
        viewHolder.txt_delivery_time = (TextView) convertView.findViewById(R.id.Datetime);
        viewHolder.txt_grand_total = (TextView) convertView.findViewById(R.id.txt_recurring_total_price5);

        viewHolder.container = (LinearLayout) convertView.findViewById(R.id.container);
        convertView.setTag(viewHolder);

    } else {

        viewHolder = (ViewHolder) convertView.getTag();
    }

    int redTextColor = context.getResources().getColor(R.color.red_text);
    int blackTextColor = context.getResources().getColor(R.color.black_text);

    viewHolder.container.removeAllViews();

    for (int i=0;i<itemsData.size();i++){

        StorewiseDetailsModel test = itemsData.get(i);

        Log.d(TAG," test "+itemsData.get(i).getStore_name());

        view = inflater.inflate(R.layout.storewise_detail_orderrow, null);
        viewHolder.container.addView(view);

        TextView txt_not_vailable = (TextView) view.findViewById(R.id.txt_not_vailable);
        TextView txt_rupee_symbol1 = (TextView) view.findViewById(R.id.txt_recurring_price_sym_qnty);
        TextView txt_rupee_symbol2 = (TextView) view.findViewById(R.id.txt_recurring_price_sym1);
        TextView txt_item_name = (TextView) view.findViewById(R.id.txt_product_name);
        TextView txt_item_size = (TextView) view.findViewById(R.id.txt_product_weight);
        TextView txt_item_quantity = (TextView) view.findViewById(R.id.txt_recurring_total_price_qnty);
        TextView txt_item_total = (TextView) view.findViewById(R.id.txt_recurring_total_price);
        TextView divider = (TextView) view.findViewById(R.id.divider);

        //These attribute should be only once per row. Should not repeat in all "item data"
        viewHolder.txt_grand_total.setText(test.getTotal());
        viewHolder.txt_building_name.setText(test.getBuilding_name());
        viewHolder.txt_tower_name.setText(test.getTower_name());
        viewHolder.txt_flat_number.setText(test.getFlat_number());
        viewHolder.txt_order_id.setText(test.getOrder_id());
        viewHolder.txt_delivery_time.setText(utilClass.formatDate(test.getDelivery_time()));

        if (test.getIs_available().equals("0")){

            txt_not_vailable.setVisibility(View.VISIBLE);
            txt_item_name.setTextColor(redTextColor);
            txt_item_size.setTextColor(redTextColor);
            txt_item_quantity.setTextColor(redTextColor);
            txt_item_total.setTextColor(redTextColor);
            txt_rupee_symbol1.setTextColor(redTextColor);
            txt_rupee_symbol2.setTextColor(redTextColor);

            txt_item_name.setText(test.getItem_name());
            txt_item_size.setText(test.getItem_size());
            txt_item_quantity.setText(test.getItem_price() + " x" + test.getItem_quantity());
            txt_item_total.setText(test.getItem_total());

        }

        else if (test.getIs_available().equals("1")){

            txt_not_vailable.setVisibility(View.GONE);

            txt_item_name.setTextColor(blackTextColor);
            txt_item_size.setTextColor(blackTextColor);
            txt_item_quantity.setTextColor(blackTextColor);
            txt_item_total.setTextColor(blackTextColor);
            txt_rupee_symbol1.setTextColor(blackTextColor);
            txt_rupee_symbol2.setTextColor(blackTextColor);

            txt_item_name.setText(test.getItem_name());
            txt_item_size.setText(test.getItem_size());
            txt_item_quantity.setText(test.getItem_price() + " x" + test.getItem_quantity());
            txt_item_total.setText(test.getItem_total());

        }

    }

    return convertView;
}


class ViewHolder {

    TextView txt_building_name;
    TextView txt_tower_name;
    TextView txt_flat_number;
    TextView txt_order_id;
    TextView txt_delivery_time;
    TextView txt_grand_total;

    LinearLayout container;
}

此外，正如我在代码注释中指定的那样，更改您的数据结构将有所帮助，从“项目数据”中删除常见的属性，如建筑物名称、总计...，并将它们包装在另一个类中，并使用“项目数据”的 ArrayList .

【讨论】：

【解决方案2】：

很抱歉，由于声誉低下，我无法发表评论。我没有明确的答案，但简要查看您的代码，我可以看到您已经使用了很多 findViewById()。因此，它可能会影响您的表现。

您可能应该修改您的代码，使Adapter 不必为每个项目都查找视图。

编辑：

好的，所以我已经修改了您的 ViewHolder 以便它在构造函数本身内找到视图，从而为您节省了每次由适配器插入视图所需的麻烦和计算费用。

class ViewHolder {
    TextView txt_building_name;
    TextView txt_tower_name;
    TextView txt_flat_number;
    TextView txt_order_id;
    TextView txt_delivery_time;
    TextView txt_grand_total;
TextView txt_item_name;
    TextView txt_item_size;
    TextView txt_item_quantity;
    TextView txt_item_total;
    LinearLayout container;
    TextView divider;
    TextView txt_not_vailable;
    TextView txt_rupee_symbol1, txt_rupee_symbol2;

    public ViewHolder(View convertView, View view) {
        txt_building_name = (TextView) convertView.findViewById(R.id.BUILDING);
        txt_tower_name = (TextView) convertView.findViewById(R.id.TOWER);
        txt_flat_number = (TextView) convertView.findViewById(R.id.FLAT_NO);
        txt_order_id = (TextView) convertView.findViewById(R.id.ORDER_NO);
        txt_delivery_time = (TextView) convertView.findViewById(R.id.Datetime);
        txt_grand_total = (TextView) convertView.findViewById(R.id.txt_recurring_total_price5);
        txt_item_name = (TextView) view.findViewById(R.id.txt_product_name);
        txt_item_size = (TextView) view.findViewById(R.id.txt_product_weight);
        txt_item_quantity = (TextView) view.findViewById(R.id.txt_recurring_total_price_qnty);
        txt_item_total = (TextView) view.findViewById(R.id.txt_recurring_total_price);
        divider = (TextView) view.findViewById(R.id.divider);
        txt_not_vailable = (TextView) view.findViewById(R.id.txt_not_vailable);
        txt_rupee_symbol1 = (TextView) view.findViewById(R.id.txt_recurring_price_sym_qnty);
        txt_rupee_symbol2 = (TextView) view.findViewById(R.id.txt_recurring_price_sym1);
    }
}

这里，convertView 是从 listview_row_storewise_details 膨胀的容器，view 是从 storewise_detail_orderrow 膨胀的另一个容器。

请尝试使用此ViewHolder，如果它可以减少延迟，请告诉我。

【讨论】：

老兄有我的问题:)，谢谢。我会找到一种方法让我的 Listview 无延迟地工作
我的快乐人。即使修改后，如果有问题也不要问。

【解决方案3】：

尝试使用recyclerview inflating 2 个不同的布局

【讨论】：

伙计，我正在使用 Listview，所以需要相关的帮助:)