listview的使用-两个listview的联动

最新推荐文章于 2024-05-29 15:38:22 发布

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本文介绍了一个使用两个ListView实现联动效果的应用案例。左侧ListView显示类别列表，右侧ListView根据左侧选择的类别展示详细子项。通过监听左侧ListView的选择变化更新右侧ListView的内容。

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源码：

http://download.youkuaiyun.com/detail/sinat_31057219/9735884

知识点：

listview的单选，两个listview的联动

效果：

Markdown

布局：

左边一个listview，右边一个listview

代码：

public class ListListActivity extends Activity {

    private ListView mainlist;
    private ListView morelist;
    private List<Map<String, Object>> mainList;
    ClassifyMainAdapter mainAdapter;
    ClassifyMoreAdapter moreAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_classify);
        initModle();
        initView();
    }

    private void initView() {
        mainlist = (ListView) findViewById(R.id.classify_mainlist);
        morelist = (ListView) findViewById(R.id.classify_morelist);
        mainAdapter = new ClassifyMainAdapter(ListListActivity.this, mainList);
        mainAdapter.setSelectItem(0);
        mainlist.setAdapter(mainAdapter);

        mainlist.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                initAdapter(Model.MORELISTTXT[position]);
                mainAdapter.setSelectItem(position);
                mainAdapter.notifyDataSetChanged();
            }
        });
        mainlist.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
        // 一定要设置这个属性，否则ListView不会刷新
        initAdapter(Model.MORELISTTXT[0]);

        morelist.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                moreAdapter.setSelectItem(position);
                moreAdapter.notifyDataSetChanged();
            }
        });
    }

    private void initAdapter(String[] array) {
        moreAdapter = new ClassifyMoreAdapter(this, array);
        morelist.setAdapter(moreAdapter);
        moreAdapter.notifyDataSetChanged();
    }

    private void initModle() {
        mainList = new ArrayList<Map<String, Object>>();
        for (int i = 0; i < Model.LISTVIEWIMG.length; i++) {
            Map<String, Object> map = new HashMap<String, Object>();
            map.put("img", Model.LISTVIEWIMG[i]);
            map.put("txt", Model.LISTVIEWTXT[i]);
            mainList.add(map);
        }
    }
}

关键：在左边listview的点击事件中给右边listview来setadapter

左边的adapter：

public class ClassifyMainAdapter extends BaseAdapter {

    private Context context;
    private List<Map<String, Object>> list;
    private int position = 0;
    private boolean islodingimg = true;
    Holder hold;

    public ClassifyMainAdapter(Context context, List<Map<String, Object>> list) {
        this.context = context;
        this.list = list;
    }

    public ClassifyMainAdapter(Context context, List<Map<String, Object>> list,
            boolean islodingimg) {
        this.context = context;
        this.list = list;
        this.islodingimg = islodingimg;
    }

    public int getCount() {
        return list.size();
    }

    public Object getItem(int position) {
        return list.get(position);
    }

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

    public View getView(int arg0, View view, ViewGroup viewGroup) {

        if (view == null) {
            view = View.inflate(context, R.layout.item_classify_mainlist, null);
            hold = new Holder(view);
            view.setTag(hold);
        } else {
            hold = (Holder) view.getTag();
        }
        if (islodingimg == true) {
            hold.img.setImageResource(Integer.parseInt(list.get(arg0)
                    .get("img").toString()));
        }
        hold.txt.setText(list.get(arg0).get("txt").toString());
        hold.layout.setBackgroundColor(0xFFEBEBEB);
        if (arg0 == position) {
            hold.layout.setBackgroundColor(0xFFFFFFFF);
        }
        return view;
    }

    public void setSelectItem(int position) {
        this.position = position;
    }

    public int getSelectItem() {
        return position;
    }

    private static class Holder {
        LinearLayout layout;
        ImageView img;
        TextView txt;

        public Holder(View view) {
            txt = (TextView) view.findViewById(R.id.mainitem_txt);
            img = (ImageView) view.findViewById(R.id.mainitem_img);
            layout = (LinearLayout) view.findViewById(R.id.mainitem_layout);
        }
    }
}

右边的adapter：

public class ClassifyMoreAdapter extends BaseAdapter {

    private Context context;
    private String[] text_list;
    private int position = 0;
    Holder hold;

    public ClassifyMoreAdapter(Context context, String[] text_list) {
        this.context = context;
        this.text_list = text_list;
    }

    public int getCount() {
        return text_list.length;
    }

    public Object getItem(int position) {
        return text_list[position];
    }

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

    public View getView(int arg0, View view, ViewGroup viewGroup) {

        if (view == null) {
            view = View.inflate(context, R.layout.item_classify_morelist, null);
            hold = new Holder(view);
            view.setTag(hold);
        } else {
            hold = (Holder) view.getTag();
        }
        hold.txt.setText(text_list[arg0]);
        hold.txt.setTextColor(0xFF666666);
        if (arg0 == position) {
            hold.txt.setTextColor(0xFFFF8C00);
        }
        return view;
    }

    public void setSelectItem(int position) {
        this.position = position;
    }

    private static class Holder {
        TextView txt;

        public Holder(View view) {
            txt = (TextView) view.findViewById(R.id.moreitem_txt);
        }
    }
}