0 
package com.coltonnicotera.londontransitguide;

//bunch of imports

public class SchedulesActivity extends Activity {

    /** Called when the activity is first created. */
    List<Map<String, String>> routesList = new ArrayList<Map<String,String>>();

    String[] routesArray = new String[] {"01. Kipps Lane/Thompson Road", "02. Dundas", "03. Hamilton Rd", "04. Oxford East", "05. Springbank", "06. Richmond", "07. Wavell", "08. Riverside", "09. Whitehills", "10. Wonderland", "11. Southcrest", "12. Warncliffe South", "13. Wellington Road", "14. Highbury", "15. Westmount", "16. Adelaide", "17. Oxford West", "19. Oakridge", "20. Cherryhill", "21. Huron Heights", "22. Trafalgar", "23. Berkshire", "24. Baseline", "25. Kilally", "26. Jalna Blvd. West", "27. Fanshawe College", "28. Lambeth", "30. Newbold", "31. Orchard Park", "32. Windermere", "33. Proudfoot", "34. Medway", "35. Argyle", "36. Airport/Industrial", "37. Sovereign Road", "38. Stoney Creek", "39. Fanshawe West"};      

    public void onCreate(Bundle savedInstanceState) {
        initList();
        ListView lv = (ListView) findViewById(R.id.listView);    
        SimpleAdapter simpleAdpt = new SimpleAdapter(this, routesList, android.R.layout.simple_list_item_1, new String[] {"route"}, new int[] {android.R.id.text1}); 
/*LINE 63 */        lv.setAdapter(simpleAdpt);
    }

   private void initList() {
       for (int i = 0; i<=36; i++)
           routesList.add(createRoute("route", routesArray[i]));
    }

   private HashMap<String, String> createRoute(String key, String name) {
        HashMap<String, String> route = new HashMap<String, String>();
        route.put(key, name);
        return route;
    }
}

私の問題は、63 行目に NullPointerException があることです。ここでnullとは正確にはわかりません。簡単にするために、すべてのインポートを削除しました。R.id.listView も存在します。

4

1 に答える 1

1

リストビューfindViewbyIdがnullを返す理由をレイアウトを設定していないので、oncreate()で実際にリストビューを取得する前にcontentViewを設定する必要があります...このようにsetContentView(R.layout.yourlayout)

于 2013-02-16T19:21:32.603 に答える