如何将ListView转换为任何类型的简单水平滚动器

Question

我正在向我的应用程序添加一个带有大约10个图标的启动器，并垂直工作，但找不到可旋转它的可靠的简单解决方案，以便水平滚动10个图标。

java：

private PackageManager manager;
private List<AppDetail> apps;
private ListView list;
private void loadListView(){
    //list = (ListView)findViewById(R.id.apps_list);//was apps_list
    list = (ListView) findViewById(R.id.apps_list);//was apps_list
    ArrayAdapter<AppDetail> adapter = new ArrayAdapter<AppDetail>(this,
            R.layout.list_item,
            apps) {
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            if(convertView == null){
                convertView = getLayoutInflater().inflate(R.layout.list_item, null);
            }
            ImageView appIcon = (ImageView)convertView.findViewById(R.id.item_app_icon);
            appIcon.setImageDrawable(apps.get(position).icon);
            TextView appLabel = (TextView)convertView.findViewById(R.id.item_app_label);
            appLabel.setText(apps.get(position).label);
            TextView appName = (TextView)convertView.findViewById(R.id.item_app_name);
            appName.setText(apps.get(position).name);
            return convertView;
        }
    };
    list.setAdapter(adapter); //Put the list on the screen
}

XML布局内部

<ListView
    android:id="@+id/apps_list"
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    android:layout_alignParentBottom="true"
    android:layout_alignParentEnd="true"
    android:layout_marginBottom="50dp"
    android:layout_marginEnd="29dp"
    android:orientation="horizontal"/>

我看到了一种叫做HorizontalsCrollview的东西，但它似乎不是直接的替代品，而只是崩溃了。

看来我应该使用回收文章，也许是这样的东西。

java：

private void loadListView(){

    mRecyclerView = (RecyclerView) findViewById(R.id.apps_list);
    ArrayAdapter<AppDetail> mAdapter = new ArrayAdapter<AppDetail>(this,
            R.layout.list_item,
            apps) {
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            if(convertView == null){
                convertView = getLayoutInflater().inflate(R.layout.list_item, null);
            }
            ImageView appIcon = (ImageView)convertView.findViewById(R.id.item_app_icon);
            appIcon.setImageDrawable(apps.get(position).icon);
            TextView appLabel = (TextView)convertView.findViewById(R.id.item_app_label);
            appLabel.setText(apps.get(position).label);
            TextView appName = (TextView)convertView.findViewById(R.id.item_app_name);
            appName.setText(apps.get(position).name);
            return convertView;
        }
    };
    mRecyclerView.setAdapter(mAdapter); //Put the list on the screen
}

XML：

<android.support.v7.widget.RecyclerView
    android:id="@+id/apps_list"
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    android:layout_alignParentBottom="true"
    android:layout_alignParentEnd="true"
    android:layout_marginBottom="50dp"
    android:layout_marginEnd="29dp"
    android:orientation="horizontal"
    android:scrollbars="horizontal"/>

但是我遇到了错误：

错误：(1212，34(错误：不兼容类型：arrayadapter 无法转换为适配器

感谢您的任何指导。

Answer 1

我已经将您的listView实现到回收器视图中，这是适配器：

public class SpecialAdapter extends RecyclerView.Adapter<SpecialAdapter.SpecialViewHolder> {
    private ArrayList<AppDetail> items;
    private Context context;
    private OnClickItem clickListener;
    public SpecialAdapter(ArrayList<AppDetail> items, Context context) {
        this.items = items;
        this.context = context;
    }
    public void setClickListener(OnClickItem clickListener) {
        this.clickListener = clickListener;
    }
    @NonNull
    @Override
    public SpecialViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false);
        return new SpecialViewHolder(v);
    }
    @Override
    public void onBindViewHolder(@NonNull SpecialViewHolder holder, int position) {
        holder.appIcon.setImageDrawable(items.get(position).icon);
        holder.appLabel.setText(items.get(position).label);
        holder.appName.setText(items.get(position).name);
    }
    @Override
    public int getItemCount() {
        return items.size();
    }
    class SpecialViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        ImageView appIcon;
        TextView appLabel;
        TextView appName;
        public SpecialViewHolder(View itemView) {
            super(itemView);
            appIcon = (ImageView) itemView.findViewById(R.id.item_app_icon);
            appLabel = (TextView) itemView.findViewById(R.id.item_app_label);
            appName = (TextView) itemView.findViewById(R.id.item_app_name);
             itemview.setOnClickListener(this);
        }
        @Override
        public void onClick(View v) {
            clickListener.onClickItem(getAdapterPosition());
        }
    }
    public interface OnClickItem {
        void onClickItem(int pos);
    }
}

要使用它，只需将您的listView替换为XML中的recyclevie，然后使用以下内容：

public void setUpRecyclerView() {
    RecyclerView list = findViewById(R.id.apps_list);
    list.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false));
    SpecialAdapter adapter = new SpecialAdapter(apps,this);
    adapter.setClickListener(this);
    list.setAdapter(adapter);
}

此外，还要使您的活动实现OnClickItem，以便能够在列表中的项目中获取点击。