Question

我正在研究BaseAdapter。我写了一些代码，可以在listview中使用baseAdapter显示图片和文字。现在我想按位置更改图像和文本背景。

这是我的baseAdapter代码

    public class SlideMenuAdapter extends BaseAdapter {
    private Context mContext;
    private final String[] menu_items_id;

    private final int[] Imageid;
    TextView textView;
    ImageView imageView;

    private static LayoutInflater inflater = null;

    public SlideMenuAdapter(Context context, String[] names, int[] Imageid)
             {
        mContext = context;

        this.Imageid = Imageid;
        this.menu_items_id = names;
        inflater = (LayoutInflater) mContext
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public int getCount() {

        return Imageid.length;
    }

    @Override
    public Object getItem(int position) {

        return null;
    }

    @Override
    public long getItemId(int position) {

        return 0;
    }

    @SuppressLint("ViewHolder")
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        View grid;

        grid = new View(mContext);
        grid = inflater.inflate(R.layout.azercell_slidemenu_adaper, null);
        textView = (TextView) grid.findViewById(R.id.desc);
        imageView = (ImageView) grid.findViewById(R.id.photo);

        textView.setText(menu_items_id[position]);


        imageView.setImageResource(Imageid[position]);
        return grid;
    }
}

这是我的listview监听器代码

listView.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {

            TextView textView1 = (TextView) parent.findViewById(R.id.desc);
            ImageView imageView=(ImageView)parent.findViewById(R.id.photo);
            switch (position) {
            case 0:
                textView1.setTextColor(Color.parseColor("#8f332a"));
                imageView.setImageResource(menu_imagesover[position]);
                break;

            case 1:
                textView1.setTextColor(Color.parseColor("#ffffff"));
                imageView.setImageResource(menu_imagesover[position]);
                break;

            default:
                break;
            }
        }
    });


int[] menu_imagesover = { R.drawable.schedule_ove, R.drawable.about_over,
        R.drawable.booking_over };

当我点击列表视图时，我只能更改第一个项目的图像和文本背景。如何编写代码可以按位置更改每个项目？

Answer 1

尝试调用invalidate方法来刷新listview：

        switch (position) {
        case 0:
            textView1.setTextColor(Color.parseColor("#8f332a"));
            imageView.setImageResource(menu_imagesover[position]);
            break;

        case 1:
            textView1.setTextColor(Color.parseColor("#ffffff"));
            imageView.setImageResource(menu_imagesover[position]);
            break;

        default:
            break;
        }
        invalidate(); //add here

如果无效，请尝试拨打invalidateViews而不是invalidate。

我认为switch (position)有些可疑，这是否意味着只有点击第1行和第2行才能使用代码？

Answer 2

将ArrayList与Hashmap一起使用，其中包含列表项的所有信息：

ArrayList<HashMap<String,Object>> listData = new ArrayList<HashMap<String, Object>>();
HashMap<String,Object> row1 = new HashMap<String, Object>();
row1.put("name","item1");
row1.put("normalImage",R.drawable.ic_launcher);
row1.put("selectedImage",R.drawable.ic_launcher);
row1.put("normalTextColor","#000000");
row1.put("selectedTextColor","#ff0000");
row1.put("isClick",false);
listData.add(row1);
SlideMenuAdapter adapter = new SlideMenuAdapter(context,listData);

更改特定列表项目的状态单击

listView.setOnItemClickListener(new OnItemClickListener() {
   @Override
   public void onItemClick(AdapterView<?> parent, View view,int position, long id) {
        if((Boolean)listData.get(position).get("isClick")){
           listData.get(position).put("isClick",false);
        }else{
           listData.get(position).put("isClick",true);
        }
        adapter.notifyDataSetChanged();
    }
});

检查getView（）适配器中的项目单击状态：

public class SlideMenuAdapter extends BaseAdapter {
    private Context context;
    private ArrayList<HashMap<String,Object>> data;

    public SlideMenuAdapter(Context context, ArrayList<HashMap<String,Object>> data)
    {
        this.context = context;
        this.data = data;
    }

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

    @Override
    public Object getItem(int position) {
        return data.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if(convertView==null){
            holder = new ViewHolder();
            convertView = LayoutInflater.from(context).inflate(R.layout.azercell_slidemenu_adaper, null);
            holder.textView = (TextView) convertView.findViewById(R.id.desc);
            holder.imageView = (ImageView) convertView.findViewById(R.id.photo);

            convertView.setTag(holder);
        }else{
            holder =(ViewHolder) convertView.getTag();
        }

        holder.textView.setText(data.get(position).get("name").toString());
        if((Boolean)data.get(position).get("isClick")){
            holder.textView.setTextColor(Color.parseColor(data.get(position).get("selectedTextColor").toString()));
            holder.imageView.setImageResource((Integer)data.get(position).get("selectedImage"));
        }else{
            holder.textView.setTextColor(Color.parseColor(data.get(position).get("normalTextColor").toString()));
            holder.imageView.setImageResource((Integer)data.get(position).get("normalImage"));
        }

        return convertView;
    }

    class ViewHolder{
        TextView textView;
        ImageView imageView;
    }
}

Android listview setOnItemClickListener按位置按开关更改图像背景

2 个答案: