如何通过存储在android数据库中的图像名称将图像设置为图像视图？

Question

我有一个类，它在数据库中获取两个字段（名称和图像）并将名称设置为文本视图并将图像设置为图像视图 现在我有图像问题，如何通过存储在数据库中的图像名称将图像设置为图像视图？ 请帮帮我！

我的源代码：

---

public class ListMovie extends BaseAdapter {

    private Resources res = null;
    private Activity activity;
    private ArrayList<HashMap<String, String>> data;
    private LayoutInflater inflate;
    ViewHolder holder;

    public ListMovie(Activity a, ArrayList<HashMap<String, String>> d) {
        // TODO Auto-generated constructor stub

        activity = a;
        data = d;
        inflate = (LayoutInflater) activity
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }
    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return data.size();
    }

    @Override
    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 View getView(int arg0, View view, ViewGroup arg2) {
        // TODO Auto-generated method stub

        View v1 = view;

        if (v1 == null) {

            v1 = inflate.inflate(R.layout.item, null);
            holder = new ViewHolder();

            holder.txt_name = (TextView) v1.findViewById(R.id.item_name);

            holder.img = (ImageView) v1.findViewById(R.id.item_img);


            v1.setTag(holder);

        } else {

            holder = (ViewHolder) v1.getTag();

        }
        HashMap<String, String> song = new HashMap<String, String>();
        song = data.get(arg0);


        holder.txt_name.setText(song.get("name"));

        return v1;

    }
    static class ViewHolder {
        TextView txt_name;
        ImageView img;  
    }
}

Answer 1

如果您的图像在 /res 文件夹中，您可以在 getView 中使用它：

int resourceId = res.getIdentifier(name, "drawable", 
   context.getPackageName());//initialize res and context in adapter's contructor
img.setImageResource(resourceId);

完整代码：

class ListMovie extends BaseAdapter {

    private Resources res = null;
    private Activity activity;
    private ArrayList<HashMap<String, String>> data;
    private LayoutInflater inflate;
    ViewHolder holder;

    public ListMovie(Activity a, ArrayList<HashMap<String, String>> d) {
        activity = a;
        data = d;
        inflate = (LayoutInflater) activity
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        res = a.getResources();
    }
    @Override
    public int getCount() {
        return data.size();
    }

    @Override
    public HashMap<String, String> 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) {
        View view = convertView;

        if (view == null) {
            view = inflate.inflate(R.layout.item, null);
            holder = new ViewHolder();
            holder.txt_name = (TextView) view.findViewById(R.id.item_name);
            holder.img = (ImageView) view.findViewById(R.id.item_img);
            view.setTag(holder);

        } else {
            holder = (ViewHolder) view.getTag();
        }
        HashMap<String, String> song = new HashMap<String, String>();
        song = data.get(position);
        holder.txt_name.setText(song.get("name"));
        int resourceId = res.getIdentifier(image_name, "drawable",
                activity.getPackageName());//initialize res and context in adapter's contructor
        img.setImageResource(resourceId);
        return view;

    }
    static class ViewHolder {
        TextView txt_name;
        ImageView img;
    }
}

将image_name 更改为您的图片名称

Answer 2

您可以使用Android Universal Image Loader 库或ion 来动态加载图像。

编辑：

试试这个link。它有一个关于如何通过代码加载图像的很好的例子。