在simpleadapter中使用drawable

Question

我正在开发一个Android应用程序。在我的应用程序中，我必须使用适配器。所以我用简单的适配器。

int[] flags = new int[]{
            R.drawable.img1,
            R.drawable.img2,

};

List<HashMap<String,String>> aList = new ArrayList<HashMap<String,String>>();
 for(int i=0;i<number.size();i++){
         HashMap<String, String> hm = new HashMap<String,String>();
     hm.put("txt", number.get(i));
     hm.put("flag", Integer.toString(flags[i]) );
     aList.add(hm);
 }

String[] from = { "flag","txt"};

    // Ids of views in listview_layout
    int[] send = { R.id.flag,R.id.txt};

    // Instantiating an adapter to store each items
    // R.layout.listview_layout defines the layout of each item
    SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), aList, R.layout.autocomplete_layout, from, send);

现在我想使用我自己的drawable arraylist而不是sourceable from resource。

Drawable d="some downloaded image from server"

现在我想在hashmap中使用上面的d。

hm.put("flag", d.toString() );

上面的说法不起作用。我知道这是因为早些时候我发送图片ID。现在我正在将图像转换为字符串。

所以我必须把我的图像放到hashmap hm。但是，如果我使用下载的可绘制图像，我怎么能放？

Answer 1

//这可能会对你有所帮助

[1]首先你需要

HashMap<String, Object> hm= new HashMap<String, Object>();
Bitmap bmImg;

[2]对于在线图像，需要1个函数来获取Bitmap对象

public void downloadFile(final String fileUrl) 
    {
        URL myFileUrl = null;
        try {
            myFileUrl = new URL(fileUrl);
            HttpURLConnection conn = (HttpURLConnection) myFileUrl.openConnection();
            conn.setDoInput(true);
            conn.connect();
            //int length = conn.getContentLength();
            InputStream is = conn.getInputStream();
            bmImg = BitmapFactory.decodeStream(is);
        } catch (MalformedURLException e) {
            // imageLoadedHandler.sendEmptyMessage(FAILED);
        } catch (IOException e) {
            // imageLoadedHandler.sendEmptyMessage(FAILED);
        }

    }

//用于将线上图像放入带有线程的hashmap中，并在此处填写数据

for(int i=0;i<number.size();i++){
     HashMap<String, Object> hm= new HashMap<String, Object>();
              new Thread() {
                            public void run() 
                            {    
                            downloadFile(smtLink[ii]);
                            hm.put("image", bmImg);
                        };
                }.start();              
              hm.put("flag", Integer.toString(flags[i]) );
              aList.add(hm);

}

//并且需要viewbinder类

class MyViewBinder implements ViewBinder 
    {
        @Override
        public boolean setViewValue(View view, Object data,String textRepresentation) 
        {
            if((view instanceof ImageView) & (data instanceof Bitmap)) 
            {
                ImageView iv = (ImageView) view;
                Bitmap bm = (Bitmap) data;
                iv.setImageBitmap(bm);
                return true;
            }
            return false;
        }

    }

//现在使用下面的简单适配器设置此数据，此处根据您的要求更改您的adpter

adapater1 = new SimpleAdapter(News.this, list, R.layout.homrow, new String[] { "im", "Titel", "Sourcetag", "Date1","im1" }, 
                            new int[] { R.id.homerowmain,R.id.homerowtitle, R.id.homerowsourcetag,R.id.homerowdate, R.id.homerowimgaerrow });
                adapater1.setViewBinder(new MyViewBinder());
                itemlist.setAdapter(adapater1);

Answer 2

试试这个

  Integer[] flags = {
        R.drawable.Yourimg1, R.drawable.Yourimg2,
        R.drawable.Yourimg3, R.drawable.Yourimg4,          

};

Answer 3

确保在你的导入中你没有android.R ...并添加你自己的R文件:)