Question

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有没有办法用它的适配器将多种类型的对象添加到列表视图中？我的适配器只能处理一种保持玩家属性的对象。但我无法将我的适配器更改为添加其他类型的对象。我想将GameObjects添加到显示游戏属性的列表中。

public class MyAdapter extends ArrayAdapter<StructureCase>

如你所见Array adabter只能处理我在上面定义为 StructureCase 的一个对象。有了这个，我可以获得物品属性：

final StructureCase item = getItem(position);
viewHolder.r_name = (TextView) convertView.findViewById(R.id.textView);
 viewHolder.r_name.setText(item.r_name);

这是结构案例：

public class StructureCase {

    public int r_ID;
    public String r_name;

    public StructureCase() {}

}

所以，如果我想拥有其他类型的物品，比如保持游戏属性的GameStructure，那么解决方案是什么？

这是我的适配器，我也定义了类型，所以我可以使用它自己的布局文件每4个项目添加列表分隔符但我应该说不幸的是我还使用了Structorecase对象来添加分隔符，但从未使用过它们的内部数据导致我的arrayadapter类型是Structurecase：（

public class MyAdapter extends ArrayAdapter<StructureCase> {

    private LayoutInflater mInflater           = null;
    public Context context;
    public Class distinationActivity = null;
    MediaPlayer myPlayer = new MediaPlayer();

    private TreeSet<Integer> mSeparatorsSet = new TreeSet<Integer>();
    private static final int TYPE_ITEM = 0;
    private static final int TYPE_SEPARATOR = 1;
    private static final int TYPE_MAX_COUNT = TYPE_SEPARATOR + 1;


    public MyAdapter(Context context, int textViewResourceId, List<StructureCase> objects) {
        super(context, textViewResourceId, objects);
        mInflater = LayoutInflater.from(context);

    }

    public static class ViewHolder {

        public TextView r_name   = null;
        public TextView r_duration   = null;
        public Button r_send_btn = null;
        public Button r_play_btn = null;
        public Button r_del_btn = null;

        public TextView textView;

    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        final ViewHolder viewHolder ;
        final View v;

        final StructureCase item = getItem(position);
        int type = getItemViewType(position);

        if (convertView == null) {

            viewHolder = new ViewHolder();

            switch (type) {
                    case TYPE_ITEM:

                        convertView = this.mInflater.inflate(R.layout.record_list_item,  null);
                        //mInflater = (LayoutInflater)G.currentActivity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                        convertView = mInflater.inflate(R.layout.record_list_item, parent, false);
                        viewHolder.r_name = (TextView) convertView.findViewById(R.id.textView_name_record_list_item);
                        viewHolder.r_duration = (TextView) convertView.findViewById(R.id.textView_duration_record_list_item);
                        viewHolder.r_send_btn = (Button) convertView.findViewById(R.id.button_send_record_list_item);
                        viewHolder.r_del_btn = (Button) convertView.findViewById(R.id.button_del_record_list_item);
                        viewHolder.r_play_btn = (Button) convertView.findViewById(R.id.button_play_record_list_item);


                        break;

                    case TYPE_SEPARATOR:


                        convertView = mInflater.inflate(R.layout.separator, null);


                        break;
                }


            convertView.setTag(viewHolder);


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

        }


        if(type == 0){

            viewHolder.r_name.setText(item.r_name);
            viewHolder.r_duration.setText(Integer.toString(item.r_duration));

            viewHolder.r_play_btn.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {



                }
            });



        }else {

            viewHolder.textView = (TextView)convertView.findViewById(R.id.textSeparator);
            viewHolder.textView.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {

                    Toast.makeText(G.currentActivity,"seprator "+position,Toast.LENGTH_SHORT).show();
                }
            });
        }


        return convertView;
    }


    public void addSeparatorItem(final String item) {
        StructureCase s = new StructureCase();

        s.r_name = item ;
        G.list.add(s);
        // save separator position
        mSeparatorsSet.add(G.list.size()-1);
        Log.i("MAHDI", "G.list.size() = " + G.list.size());

        notifyDataSetChanged();
    }



    @Override
    public int getItemViewType(int position) {
        return mSeparatorsSet.contains(position) ? TYPE_SEPARATOR : TYPE_ITEM;
    }

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

这是将项目添加到列表的主要活动的一部分：

G.list.clear();
    recordingListView.setAdapter(null);
    mAdapter.clear();
    mAdapter.notifyDataSetChanged();
    recordingListView.setAdapter(G.mAdapter);


    if(myCursor.getCount() != 0) for (int i = 1; i <= myCursor.getCount(); i++) {

        StructureCase sample = new StructureCase();
        sample.r_ID = myCursor.getInt(myCursor.getColumnIndex(G.db._ID));
        sample.r_name = myCursor.getString(myCursor.getColumnIndex(G.db._NAME));

        list.add(sample);



        if (i % 4 == 0) {
            mAdapter.addSeparatorItem("separator " + i);
        }


    }

Answer 1

@Override
public int getItemViewType(int position) {
    return type
}

@Override
public int getViewTypeCount() {
    return count;
}

覆盖这两种方法以获得不同的视图类型..

在getview（）中，只需检查它是哪种类型并调用你的布局..请参阅此处的示例。

if (convertView == null) {
    holder = new ViewHolder();
    if (getItemViewType(position) == 0) {
        convertView = inflater.inflate(R.layout.your_layout_one, parent, false);
    } else {
        convertView = inflater.inflate(R.layout.your_layout_two, parent, false);
    }
}

Answer 2

一种解决方案是创建一个类：

class SomeData{
    String dataType;
    dataTypeSeperator seperatorData;
    dataTypeItem ItemData;
    geters();
    seters();
}

现在在ArrayList<SomeData>或HashMap<key, SomeData>

中使用此课程

您可以在objectName.dataType添加条件，例如：

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View view;
    if(objectName.dataType == "yourDataType") { //condition
        view = inflater.inflate(R.layout.list_row_text_msg, null);
    } else if(...){
        view = inflater.inflate(R.layout.list_row_image_msg, null);
    } else {
        ...
    }

    ...
}

添加多种类型的objecst以列出具有自定义布局的视图

2 个答案: