Question

我用CardView制作了一个RecyclerView。而CardView包含TextView和ListView。 TextView可以很好地回收，但ListView的项目与我上次使用的相同。我该如何解决这个问题？

我正在使用自定义列表视图来修复问题CardView不会传播整个listView项目。

这是我的代码。

recyclerview adapter:

public class NoticeAdapter extends RecyclerView.Adapter<NoticeAdapter.NoticeViewHolder>{
private ArrayList<String> noticeTypes;
private ArrayList<ArrayList<String>> noticeTitles;
private ArrayList<ArrayList<String>> noticeDates;

public NoticeAdapter() {
    noticeTypes = new ArrayList<>();
    noticeTitles = new ArrayList<ArrayList<String>>();
    noticeDates = new ArrayList<ArrayList<String>>();
}

public void addNoticeSet(String noticeType, ArrayList<String> noticeTitle, ArrayList<String> noticeDate) {
    noticeTypes.add(noticeType);
    noticeTitles.add(noticeTitle);
    noticeDates.add(noticeDate);
}

@Override
public NoticeViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
    View itemView = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.notice_row, viewGroup, false);
    return new NoticeViewHolder(itemView);
}

@Override
public void onBindViewHolder(NoticeViewHolder noticeViewHolder, int i) {
    NoticeListAdapter noticeListAdapter = new NoticeListAdapter();
    noticeViewHolder.lv_noticeList.setAdapter(noticeListAdapter);

    String noticeType = noticeTypes.get(i);
    noticeViewHolder.tv_noticeType.setText(noticeType);
    noticeViewHolder.tv_noticeType.setPaintFlags(noticeViewHolder.tv_noticeType.getPaintFlags() | Paint.FAKE_BOLD_TEXT_FLAG);

    for(int m=0; m<5; m++)
        noticeListAdapter.addNoticeSet(noticeTitles.get(i).get(m),noticeDates.get(i).get(m));
}

@Override
public int getItemCount() {
    return noticeTypes.size();
}

public static class NoticeViewHolder extends RecyclerView.ViewHolder {

    protected TextView tv_noticeType;
    protected NoticeListView lv_noticeList;

    public NoticeViewHolder(View itemView) {
        super(itemView);
        tv_noticeType = (TextView)itemView.findViewById(R.id.tv_noticeType);
        lv_noticeList = (NoticeListView)itemView.findViewById(R.id.lv_noticeList);
    }
  }
}

自定义列表视图适配器：

    public class NoticeListAdapter extends BaseAdapter {
    private ArrayList<String> noticeTitles;
    private ArrayList<String> noticeDates;

    public NoticeListAdapter() {
        noticeTitles = new ArrayList<>();
        noticeDates = new ArrayList<>();
    }

    public void addNoticeSet(String noticeTitle, String noticeDate) {
        noticeTitles.add(noticeTitle);
        noticeDates.add(noticeDate);
    }

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

    @Override
    public HashMap<String, String> getItem(int position) {
        HashMap<String, String> noticeSet = new HashMap<>();
        noticeSet.put(noticeTitles.get(position), noticeDates.get(position));
        return noticeSet;
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        final int pos = position;
        final Context context = parent.getContext();

        View v = convertView;

        if(v == null) {
            LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v = inflater.inflate(R.layout.noticelist_row, parent, false);
            TextView noticeTitle = (TextView)v.findViewById(R.id.tv_noticeTitle);
            TextView noticeDate = (TextView)v.findViewById(R.id.tv_noticeDate);

            noticeTitle.setText(noticeTitles.get(position));
            noticeDate.setText(noticeDates.get(position));
        }
        return v;
    }
}

自定义列表视图：

    public class NoticeListView extends ListView {
    public NoticeListView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public NoticeListView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public NoticeListView(Context context) {
        super(context);
    }

    @Override
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,
                MeasureSpec.AT_MOST);
        super.onMeasure(widthMeasureSpec, expandSpec);
    }
}

cardview 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="match_parent"
    android:orientation="vertical">

    <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/cv_notice"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="5dip"
        android:layout_gravity="center"
        card_view:cardCornerRadius="4dip">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:padding="10dp">

            <TextView
                android:id="@+id/tv_noticeType"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="10dip" />

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent">

                <com.rb16.mainpage.NoticeListView
                    android:id="@+id/lv_noticeList"
                    android:layout_width="match_parent"
                    android:layout_height="fill_parent"
                    android:footerDividersEnabled="false"
                    android:overScrollFooter="@android:color/transparent"/>

            </LinearLayout>
        </LinearLayout>

    </android.support.v7.widget.CardView>

</LinearLayout>

我如何把它放在主要活动中：

private void setNoticeCard() {

    //noticeTitle = new ArrayList<String>();
    //noticeDate = new ArrayList<String>();
    //noticeAdapter = NoticeAdapter();

    noticeTitle.add("1");
    noticeTitle.add("1");
    noticeTitle.add("1");
    noticeTitle.add("1");
    noticeTitle.add("1");

    noticeDate.add("2015-05-31");
    noticeDate.add("2015-05-32");
    noticeDate.add("2015-05-33");
    noticeDate.add("2015-05-34");
    noticeDate.add("2015-05-35");

    noticeAdapter.addNoticeSet("Notice1", noticeTitle, noticeDate);
    noticeTitle.clear();
    noticeDate.clear();

    noticeTitle.add("2");
    noticeTitle.add("2");
    noticeTitle.add("2");
    noticeTitle.add("2");
    noticeTitle.add("2");

    noticeDate.add("2016-07-08");
    noticeDate.add("2015-05-30");
    noticeDate.add("2015-05-30");
    noticeDate.add("2015-05-30");
    noticeDate.add("2015-05-30");

    noticeAdapter.addNoticeSet("Notice2", noticeTitle, noticeDate);
    noticeTitle.clear();
    noticeDate.clear();

    noticeTitle.add("3");
    noticeTitle.add("3");
    noticeTitle.add("3");
    noticeTitle.add("3");
    noticeTitle.add("3");

    noticeDate.add("2015-05-30");
    noticeDate.add("2015-05-30");
    noticeDate.add("2015-05-30");
    noticeDate.add("2015-05-30");
    noticeDate.add("2015-05-30");

    noticeAdapter.addNoticeSet("Notice3", noticeTitle, noticeDate);
}

Answer 1

而不是创建通知标题和通知日期的StringList。创建一个NoticeDetails类。

public class NoticeDetail {

String notice_name;
String notice_date;
String notice_title;

public String getNotice_name() {
    return notice_name;
}

public void setNotice_name(String notice_name) {
    this.notice_name = notice_name;
}

public String getNotice_date() {
    return notice_date;
}

public void setNotice_date(String notice_date) {
    this.notice_date = notice_date;
}

public String getNotice_title() {
    return notice_title;
}

public void setNotice_title(String notice_title) {
    this.notice_title = notice_title;
}

}

现在创建此类的arraylist，并在每次添加数据之前创建该类的新对象并将数据设置为类，最后将该类添加到NoticeDetails类的arraylist中。并将arraylist传递给Adapter而不是字符串数组。

RecyclerView中的ListView不回收

1 个答案: