Question

当我点击项目时，有时候滚动时，gridview项目会随机改变顺序。我在互联网上搜索过但无法找到适用于recyclerview的解决方案。

这是我的布局适配器类

public class LayoutAdapter extends RecyclerView.Adapter<LayoutAdapter.SimpleViewHolder>{
    private static final int COUNT = 100;
    private static final String TAG = "LayoutAdapter";
    private final Context mContext;
    private final TwoWayView mRecyclerView;
    private final int mLayoutId;
    private int mCurrentItemId = 0;
    private FileManager file_manager;
    private ArrayList<Integer> positions;
    private static LayoutInflater inflator = null;
    private TextView folder_name;
    private Context c;
    ArrayList<String> mDataSource, mMultiSelectData;
    private File file, files;
    private File[] list2;
    public boolean multi_select_flag = false;

    public class SimpleViewHolder extends RecyclerView.ViewHolder {


        public SimpleViewHolder(View view) {
            super(view);
            thumbnail = (ImageView) view.findViewById(R.id.ivFolderThumbnail);
            folder_name = (TextView) view.findViewById(R.id.tvFolderTitle);
        }
    }


    //In logcat I see this constructor is being called again and again and again!

    public LayoutAdapter(Context context, TwoWayView recyclerView, int layoutId, FileManager filemanager, String file_path) {
        mContext = context;
        file_manager = filemanager;
        c = context;
        mDataSource = new ArrayList<String>(file_manager.setHomeDir
                (Environment.getExternalStorageDirectory().getPath()));

        mRecyclerView = recyclerView;
        mLayoutId = layoutId;
        String root_sd = Environment.getExternalStorageDirectory().toString();
        if (file_path == null) {
            file = new File(root_sd);
        } else {
            file = new File(root_sd + "/" + file_path);
        }
        Log.d(TAG, "GOT ALL FILES >>>>>>" + root_sd);
        list2 = file.listFiles();
    }





    public String getName(int position) {
        String name = list2[position].getName();
        return name;
    }

    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public SimpleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        final View view = LayoutInflater.from(mContext).inflate(R.layout.grid_item, parent, false);
        return new SimpleViewHolder(view);
    }

    public String getData(int position) {

        if (position > mDataSource.size() - 1 || position < 0)
            return null;

        return mDataSource.get(position);
    }

    @Override
    public void onBindViewHolder(SimpleViewHolder holder, int position) {

        //        boolean isVertical = (mRecyclerView.getOrientation() ==TwoWayLayoutManager.Orientation.VERTICAL);
        final View itemView = holder.itemView;
        int num_items = 0;
        String temp = file_manager.getCurrentDir();
        File file = new File(temp + "/" + mDataSource.get(position));
        String[] list = file.list();

        if (list != null)
            num_items = list.length;

        Log.d(TAG, ">>>>>>>>>>>>> " + String.valueOf(file.length()));
        folder_name.setText(file.getName());
     }


    }

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

}

这是布局文件

 <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="105dp"
android:layout_height="105dp"
android:orientation="vertical" >

<com.filemanager.android.SquareImageView
    android:id="@+id/ivFolderThumbnail"
    android:layout_width="70dp"
    android:layout_height="70dp"
    android:layout_marginLeft="15dp"
    android:scaleType="centerCrop"
    android:src="@drawable/ic_launcher" />

<TextView
    android:id="@+id/tvFolderTitle"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_below="@+id/ivFolderThumbnail"
    android:text="Medium Text"
    android:textColor="@android:color/black"
    android:textAppearance="?android:attr/textAppearanceMedium" />

<ImageView
    android:id="@+id/ivMultiSelect"
    android:layout_width="50dp "
    android:layout_height="50dp"
    android:layout_above="@+id/tvFolderTitle"
    android:layout_toRightOf="@+id/ivFolderThumbnail"
    android:src="@drawable/ic_action_new" />

</RelativeLayout>

Answer 1

您也可以发布布局定义吗？我们已经知道，如果商品没有固定或预定义的尺寸，那么在TwoWay / Recycler Views的情况下，商品可能会改变订单。

发生这种情况是因为在回收站视图中，当我们向下滚动并且旧项目维度可能与新项目维度不同时，会重复使用旧项目视图。因此他们可能会重新排序。

在这种情况下，为ImageView和TextView设置固定尺寸可以解决问题或在充气前确定ImageView的尺寸。

Answer 2

我遇到了同样的问题，这真的很烦人。我测试了几个东西，其中一个做了诀窍：我不知道为什么，但是你必须使用[RecyclerView].setItemAnimator(null)将物品动画显式设置为null为回收器视图; ...尤其是在交错布局中再次向上滚动时重新排序的第一项。现在它消失了。希望这对你也有帮助。

Issue @ GitHub

Answer 3

是的，这很烦人;我已经意识到的解决方案是在适配器中清除所有条件，例如每个if条件也会有其他有效的主体。尝试这种方法，你将摆脱这个问题。

Gridview项目使用RecyclerView更改订单

3 个答案: