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我正在努力从url获取缩略图。该customizedListView类：

public class CustomizedListView extends Activity

{

// All static variables

static final String URL = "http://173.193.24.66/~kanz/video/XML/9.xml";

// XML node keyse.

static final String KEY_SONG = "item"; // parent node

static final String KEY_TITLE = "title";

static final String KEY_ARTIST = "description";

static final String KEY_DURATION = "duration";

static final String KEY_THUMB_URL = "image";

ListView list;

LazyAdapter adapter;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

ArrayList> songsList = new ArrayList>();

XMLParser parser = new XMLParser();

String xml = parser.getXmlFromUrl(URL); // getting XML from URL

Document doc = parser.getDomElement(xml); // getting DOM element

NodeList nl = doc.getElementsByTagName(KEY_SONG);

// looping through all song nodes

for (int i = 0; i < nl.getLength(); i++) {

// creating new HashMap

HashMap map = new HashMap ();

Element e = (Element) nl.item(i);

// adding each child node to HashMap key => value

map.put(KEY_TITLE, parser.getValue(e, KEY_TITLE));

map.put(KEY_ARTIST, parser.getValue(e, KEY_ARTIST));

map.put(KEY_DURATION, parser.getValue(e, KEY_DURATION));

map.put(KEY_THUMB_URL, parser.getValue(e, KEY_THUMB_URL));

// adding HashList to ArrayList

songsList.add(map);

}

list=(ListView)findViewById(R.id.list);

// Getting adapter by passing xml data ArrayList

adapter=new LazyAdapter(this, songsList);

list.setAdapter(adapter);

// Click event for single list row

list.setOnItemClickListener(new OnItemClickListener() {

@Override

public void onItemClick(AdapterView> parent, View view,

int position, long id) {

Context context = getApplicationContext();

Intent in = new Intent(context, SingleMenuItemActivity.class);

in.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

context.startActivity(in);

}

});

}

}

我的适配器

public class LazyAdapter extends BaseAdapter {

private Activity activity;

private ArrayList > data;

private static LayoutInflater inflater=null;

public ImageLoader imageLoader;

public LazyAdapter(Activity a, ArrayList> d) {

activity = a;

data=d;

inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

imageLoader=new ImageLoader(activity.getApplicationContext());

}

public int getCount() {

return data.size();

}

public Object getItem(int position) {

return position;

}

public long getItemId(int position) {

return position;

}

public View getView(int position, View convertView, ViewGroup parent) {

View vi=convertView;

if(convertView==null)

vi = inflater.inflate(R.layout.list_row, null);

TextView title = (TextView)vi.findViewById(R.id.title); // title

TextView artist = (TextView)vi.findViewById(R.id.artist); // artist name

TextView duration = (TextView)vi.findViewById(R.id.duration); // duration

ImageView thumb_image=(ImageView)vi.findViewById(R.id.list_image); // thumb image

HashMap song = new HashMap();

song = data.get(position);

// Setting all values in listview

title.setText(song.get(CustomizedListView.KEY_TITLE));

artist.setText(song.get(CustomizedListView.KEY_ARTIST));

duration.setText(song.get(CustomizedListView.KEY_DURATION));

imageLoader.DisplayImage(song.get(CustomizedListView.KEY_THUMB_URL), thumb_image);

return vi;

}

}

虽然logcat的给空指针异常。

03-27 19:16:29.321: E/AndroidRuntime(1516): FATAL EXCEPTION: main

03-27 19:16:29.321: E/AndroidRuntime(1516): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.razatubevidurl/com.example.razatubevidurl.CustomizedListView}: java.lang.NullPointerException

03-27 19:16:29.321: E/AndroidRuntime(1516): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)

03-27 19:16:29.321: E/AndroidRuntime(1516): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)

03-27 19:16:29.321: E/AndroidRuntime(1516): at android.app.ActivityThread.access$600(ActivityThread.java:141)

03-27 19:16:29.321: E/AndroidRuntime(1516): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)

03-27 19:16:29.321: E/AndroidRuntime(1516): at android.os.Handler.dispatchMessage(Handler.java:99)

03-27 19:16:29.321: E/AndroidRuntime(1516): at android.os.Looper.loop(Looper.java:137)

03-27 19:16:29.321: E/AndroidRuntime(1516): at android.app.ActivityThread.main(ActivityThread.java:5041)

03-27 19:16:29.321: E/AndroidRuntime(1516): at java.lang.reflect.Method.invokeNative(Native Method)

03-27 19:16:29.321: E/AndroidRuntime(1516): at java.lang.reflect.Method.invoke(Method.java:511)

03-27 19:16:29.321: E/AndroidRuntime(1516): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)

03-27 19:16:29.321: E/AndroidRuntime(1516): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)

03-27 19:16:29.321: E/AndroidRuntime(1516): at dalvik.system.NativeStart.main(Native Method)

03-27 19:16:29.321: E/AndroidRuntime(1516): Caused by: java.lang.NullPointerException

03-27 19:16:29.321: E/AndroidRuntime(1516): at com.example.razatubevidurl.CustomizedListView.onCreate(CustomizedListView.java:49)

03-27 19:16:29.321: E/AndroidRuntime(1516): at android.app.Activity.performCreate(Activity.java:5104)

03-27 19:16:29.321: E/AndroidRuntime(1516): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)

03-27 19:16:29.321: E/AndroidRuntime(1516): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)

03-27 19:16:29.321: E/AndroidRuntime(1516): ... 11 more

请帮我解释我做错了什么。 logcat提供了这个例外，并在模拟器上我得到一个警告说：“不幸的是，myApp已经停止”任何帮助将不胜感激。谢谢。 PS：我已经提到了清单中的所有活动，并拥有所有权限。

编辑：这是我的XML：

![CDATA[New Playlist]]

HAMD(LA ILAHA ILLALLAH)

Recited By :Alhaaj Muhammad Owais Raza Qadri -- Written By: Mufti-e-Azam Hind Molana Mustafa Raza Khan Noori

http://173.193.24.66/~kanz/video/Images/9.jpg

true

510

http://173.193.24.66/~kanz/video/flv/9.flv

http://173.193.24.66/~kanz/video/mp4/9.mp4

direct

+2

如果您发布完整的日志消息，它将对您有帮助。 –

2013-03-27 10:39:28

+0

@ android.fryo查看我更新的问题 –

2013-03-27 19:19:28

+0

你可以发布完整的CustomizedListView类吗？日志文件中的行号告诉我们什么都没有。 –

2013-03-28 00:58:05