自定义列表视图太慢

Question

好吧，我的自定义列表视图非常慢，几乎无法使用，我已经阅读了很多帖子但没有人帮助我修复它，我希望你们中的一个可以，谢谢。

这是我的项目列表视图 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="wrap_content">

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="300px"
        android:id="@id/iv_tipo"
        android:scaleType="centerCrop"
        android:layout_marginLeft="5px"
        android:layout_marginRight="5px"
        />



        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/material_blue_grey_800"
            android:textColor="#ffffff"
            android:textAlignment="center"
            android:textSize="27px"
            android:paddingLeft="10px"
            android:id="@id/tv_titulo"
            android:paddingTop="10px"
            android:paddingBottom="20px"
            android:paddingRight="5px"
            android:layout_marginLeft="5px"
            android:layout_marginRight="5px"/>



</LinearLayout>

这是适配器

public class TrucoListAdapter extends ArrayAdapter {

    ArrayList<Truco> trucos;

    public TrucoListAdapter(Context context, ArrayList<Truco> trucos) {
        super(context, 0, trucos);
        trucos = this.trucos;

    }

    @Override
    public Object getItem(int position) {
        return super.getItem(super.getCount() - position - 1);
    }

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


        if(convertView == null){
            LayoutInflater inflater = (LayoutInflater)parent.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.truco_list_item, null);

        }


        ImageView ivTipo = (ImageView) convertView.findViewById(R.id.iv_tipo);
        TextView tvTitulo = (TextView) convertView.findViewById(R.id.tv_titulo);

        Truco truco = (Truco)getItem(position);

        switch (truco.getTipo()) {
            case "m":
                ivTipo.setImageResource(R.drawable.coins);
                break;
            case "c":
                ivTipo.setImageResource(R.drawable.cards);
                break;
            case "a":
                ivTipo.setImageResource(R.drawable.guess);
                break;
            case "d":
                ivTipo.setImageResource(R.drawable.desa);
                break;
            default:
                ivTipo.setImageResource(R.drawable.home);

        }

            tvTitulo.setText(truco.getTitulo());

        return convertView;
    }

}

编辑：我按照@KishanSoni 的建议修改了我的适配器，但它仍然很慢。

Answer 1

一些问题-

Truco 类：getTito() 和 getTitulo()- 他们做任何昂贵的处理吗？

drawables 小吗（图标大小）？ IE，你在处理 20 万个可绘制对象吗？

您将多少个 trucos 加载到数组列表中？

抱歉，由于代表人数少，我无法将此添加为评论。

Answer 2

使用基本适配器而不是阵列适配器 也使用持有人模式， 例如，我给你它的样本

public class MyAdpt extends BaseAdapter {

    private LayoutInflater mInflater;

    public ArrayList<String> mdata;

    public MyAdpt (ArrayList<String> data) {
        mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        mdata = data;
    }

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

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

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

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

        final ItemViewHolder itemHolder;

        if (convertView == null) {
            itemHolder = new ItemViewHolder();
            convertView = mInflater.inflate(R.layout.row_layout, null);
            itemHolder.textview= (TextView) convertView.findViewById(R.id.textview);
            convertView.setTag(itemHolder);
        } else {
            itemHolder = (ItemViewHolder) convertView.getTag();
        }

        itemHolder.textview.setText(mdata.get(position));

        return convertView;
    }

    public class ItemViewHolder {
        TextView textview;
    }
}

编辑：

public class TrucoListAdapter extends BaseAdapter {

ArrayList<Truco> trucos;

public TrucoListAdapter(Context context, ArrayList<Truco> trucos) {
    super(context, 0, trucos);
    trucos = this.trucos;
}

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

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

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

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

    final ItemViewHolder itemHolder;

    if (convertView == null) {
        itemHolder = new ItemViewHolder();
        LayoutInflater inflater = (LayoutInflater) parent.getContext()
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.truco_list_item, null);

        itemHolder.ImageView ivTipo = (ImageView) convertView.findViewById(R.id.iv_tipo);
        itemHolder.TextView tvTitulo = (TextView) convertView.findViewById(R.id.tv_titulo);
        convertView.setTag(itemHolder);
    } else {
        itemHolder = (ItemViewHolder) convertView.getTag();
    }

    Truco truco = (Truco) getItem(position);

    switch (truco.getTipo()) {
    case "m":
        ivTipo.setImageResource(R.drawable.coins);
        break;
    case "c":
        ivTipo.setImageResource(R.drawable.cards);
        break;
    case "a":
        ivTipo.setImageResource(R.drawable.guess);
        break;
    case "d":
        ivTipo.setImageResource(R.drawable.desa);
        break;
    default:
        ivTipo.setImageResource(R.drawable.home);

    return convertView;
}

public class ItemViewHolder {
    ImageView ivTipo;
    TextView tvTitulo;
}
}