当我调用notifyDatasetChanged()时,为什么我的listview不会更新？
我可以使它显示数据的唯一方法是,再次在ListView上调用setAdatper()…我也尝试通过runOnUIThread()调用它,它没有更改任何内容
我可以使它显示数据的唯一方法是,再次在ListView上调用setAdatper()…我也尝试通过runOnUIThread()调用它,它没有更改任何内容
适配器
/** * Adapter to provide the data for the online scores * * @author soh#zolex * */ public class OnlinescoresAdapter extends BaseAdapter { private Context context; private List<scoreItem> scores = new ArrayList<scoreItem>(); /** * Constructor * * @param Context context */ public OnlinescoresAdapter(Context context) { this.context = context; } /** * Add an item to the adapter * * @param item */ public void addItem(scoreItem item) { this.scores.add(item); } /** * Get the number of scores * * @return int */ public int getCount() { return this.scores.size(); } /** * Get a score item * * @param int pos * @return Object */ public Object getItem(int pos) { return this.scores.get(pos); } /** * Get the id of a score * * @param in pos * @retrn long */ public long getItemId(int pos) { return 0; } /** * Get the type of an item view * * @param int pos * @return int */ public int getItemViewType(int arg0) { return arg0; } /** * Create the view for a single list item. * Load it from an xml layout. * * @param int pos * @param View view * @param ViewGroup viewGroup * @return View */ public View getView(int pos,View view,ViewGroup group) { LinearLayout layout; if (view == null) { layout = (LinearLayout)View.inflate(this.context,R.layout.scoreitem,null); } else { layout = (LinearLayout)view; } TextView position = (TextView)layout.findViewById(R.id.pos); TextView time = (TextView)layout.findViewById(R.id.time); TextView player = (TextView)layout.findViewById(R.id.player); TextView createdAt = (TextView)layout.findViewById(R.id.created_at); scoreItem item = (scoreItem)getItem(pos); player.setText(item.player); position.setText(String.valueOf(new Integer(item.position)) + "."); time.setText(String.format("%.4f",item.time)); createdAt.setText(item.created_at); return layout; } /** * Get the number of different views * * @return int */ public int getViewTypeCount() { return 1; } /** * Return wheather the items have stable IDs or not * * @return boolean */ public boolean hasstableIds() { return false; } /** * Return wheather the list is empty or not * * @return boolean */ public boolean isEmpty() { return this.scores.size() == 0; } /** * No need of a data observer * * @param DataSetobserver arg0 * @return void */ public void registerDataSetobserver(DataSetobserver arg0) { } /** * No need of a data observer * * @param DataSetobserver arg0 * @return void */ public void unregisterDataSetobserver(DataSetobserver arg0) { } /** * No item should be selectable * * @return boolean */ public boolean areAllItemsEnabled() { return false; } /** * No item should be selectable * * @param int pos * @return boolean */ public boolean isEnabled(int arg0) { return false; } }
活动
XMLLoaderThread工作正常,只是notifyDatasetChanged似乎什么也不做…
/** * Obtain and display the online scores * * @author soh#zolex * */ public class OnlinescoresDetails extends ListActivity { WakeLock wakeLock; OnlinescoresAdapter adapter; boolean isLoading = false; int chunkLimit = 50; int chunkOffset = 0; @Override /** * Load the scores and initialize the pager and adapter * * @param Bundle savedInstanceState */ public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); PowerManager powerManager = (PowerManager) getSystemService(Context.POWER_SERVICE); this.wakeLock = powerManager.newWakeLock(PowerManager.FULL_WAKE_LOCK,"racesow"); adapter = new OnlinescoresAdapter(this); setlistadapter(adapter); this.loadData(); setContentView(R.layout.listview); getListView().setonScrollListener(new OnScrollListener() { public void onScrollStateChanged(AbsListView view,int scrollState) { } public void onScroll(AbsListView view,int firstVisibleItem,int visibleItemCount,int totalItemCount) { if (totalItemCount > 0 && visibleItemCount > 0 && firstVisibleItem + visibleItemCount >= totalItemCount) { if (!isLoading) { loadData(); } } } }); } public void loadData() { final ProgressDialog pd = new ProgressDialog(OnlinescoresDetails.this); pd.setProgressstyle(ProgressDialog.STYLE_SPINNER); pd.setMessage("Obtaining scores..."); pd.setCancelable(false); pd.show(); isLoading = true; String mapName = getIntent().getStringExtra("map"); XMLLoaderThread t = new XMLLoaderThread("http://racesow2d.warsow-race.net/map_positions.PHP?name=" + mapName + "&offset=" + this.chunkOffset + "&limit=" + this.chunkLimit,new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { // network error case 0: new AlertDialog.Builder(OnlinescoresDetails.this) .setMessage("Could not obtain the maplist.\nCheck your network connection and try again.") .setNeutralButton("OK",new OnClickListener() { public void onClick(DialogInterface arg0,int arg1) { finish(); overridePendingTransition(0,0); } }) .show(); break; // maplist received case 1: pd.dismiss(); InputStream xmlStream; try { xmlStream = new ByteArrayInputStream(msg.getData().getString("xml").getBytes("UTF-8")); XMLParser parser = new XMLParser(); parser.read(xmlStream); NodeList positions = parser.doc.getElementsByTagName("position"); int numPositions = positions.getLength(); for (int i = 0; i < numPositions; i++) { Element position = (Element)positions.item(i); scoreItem score = new scoreItem(); score.position = Integer.parseInt(parser.getValue(position,"no")); score.player = parser.getValue(position,"player"); score.time = Float.parseFloat(parser.getValue(position,"time")); score.created_at = parser.getValue(position,"created_at"); adapter.addItem(score); } adapter.notifyDataSetChanged(); chunkOffset += chunkLimit; isLoading = false; } catch (UnsupportedEncodingException e) { new AlertDialog.Builder(OnlinescoresDetails.this) .setMessage("Internal error: " + e.getMessage()) .setNeutralButton("OK",null) .show(); } break; } pd.dismiss(); } }); t.start(); } /** * Acquire the wakelock on resume */ public void onResume() { super.onResume(); this.wakeLock.acquire(); } /** * Release the wakelock when leaving the activity */ public void onDestroy() { super.onDestroy(); this.wakeLock.release(); } /** * disable animations when leaving the activity */ public void onBackpressed() { this.finish(); this.overridePendingTransition(0,0); } }
解决方法
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