Android ListView with images from special hashmap

问题

I try to handle a hashmap to show a listview with images. I search for an answer like here: How to display Images in ListView android. But it doesn't work...

My Code is:

for (int i = 0; i < nodes.getLength(); i++) {
Element e = (Element)nodes.item(i);
Map<String, Object> datum = new HashMap<String, Object>(2);
String img_url = getValue(e, "pic");
URL url = null;
                        try {
                            url = new URL(img_url);
                        } catch (MalformedURLException e1) {
                            // TODO Auto-generated catch block
                            e1.printStackTrace();
                        }
                        Bitmap bmp = null; 
                        try {
                            bmp=BitmapFactory.decodeStream(url.openConnection().getInputStream());
                        } catch (IOException e1) {
                            // TODO Auto-generated catch block
                            e1.printStackTrace();
                        }

                        datum.put("imgurl", bmp);
                        datum.put("title", getValue(e, "title"));
                        datum.put("date", getValue(e, "description"));
                        datum.put("ex", "Autor: "+getValue(e, "creator")+" · Datum: "+getValue(e, "pubDate"));
                        datum.put("id", getValue(e, "id"));

                        data.add(datum);
                }       


final ListView lv = (ListView)findViewById(R.id.listView1);
ada = new SimpleAdapter(getApplicationContext(), data, R.layout.vlistimage, new String[] {"imgurl", "title", "date", "ex", "id"}, new int[] {R.id.list_image, android.R.id.text1, android.R.id.text2, R.id.text3}); 
lv.setAdapter(ada);

Thanks for a hint / helping!

回答1:

This is very common question and you could google example. What I can tell you for sure it is WRONG to store your images in memory, as you can get OutOfMemoryException.

To learn how to work with images and cache visit Displaying Bitmaps Efficiently

来源：https://stackoverflow.com/questions/13209748/android-listview-with-images-from-special-hashmap