Suche in einer bereits mit Daten aus DB gefüllten ListActivity

103-30 16:29:43.381: ERROR/AndroidRuntime(546): java.lang.RuntimeException: Unable to start activity ComponentInfo{package/package.MagazineViewController}: java.lang.NullPointerException
203-30 16:29:43.381: ERROR/AndroidRuntime(546): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
303-30 16:29:43.381: ERROR/AndroidRuntime(546): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
403-30 16:29:43.381: ERROR/AndroidRuntime(546): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
503-30 16:29:43.381: ERROR/AndroidRuntime(546): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
603-30 16:29:43.381: ERROR/AndroidRuntime(546): at android.os.Handler.dispatchMessage(Handler.java:99)
703-30 16:29:43.381: ERROR/AndroidRuntime(546): at android.os.Looper.loop(Looper.java:123)
803-30 16:29:43.381: ERROR/AndroidRuntime(546): at android.app.ActivityThread.main(ActivityThread.java:4627)
903-30 16:29:43.381: ERROR/AndroidRuntime(546): at java.lang.reflect.Method.invokeNative(Native Method)
1003-30 16:29:43.381: ERROR/AndroidRuntime(546): at java.lang.reflect.Method.invoke(Method.java:521)
1103-30 16:29:43.381: ERROR/AndroidRuntime(546): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
1203-30 16:29:43.381: ERROR/AndroidRuntime(546): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
1303-30 16:29:43.381: ERROR/AndroidRuntime(546): at dalvik.system.NativeStart.main(Native Method)
14
1503-30 16:29:43.381: ERROR/AndroidRuntime(546): Caused by: java.lang.NullPointerException
1603-30 16:29:43.381: ERROR/AndroidRuntime(546): at package.MagazineViewController.doSearch(MagazineViewController.java:111)
1703-30 16:29:43.381: ERROR/AndroidRuntime(546): at package.MagazineViewController.onCreate(MagazineViewController.java:40)
1803-30 16:29:43.381: ERROR/AndroidRuntime(546): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
1903-30 16:29:43.381: ERROR/AndroidRuntime(546): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
2003-30 16:29:43.381: ERROR/AndroidRuntime(546): ... 11 more

1public class MagazineViewController extends ListActivity {
2
3DatabaseHelper dbHelper;
4SimpleCursorAdapter adapter = null;
5Cursor c;
6
7@Override
8public void onCreate(Bundle savedInstanceState) {
9 super.onCreate(savedInstanceState);
10
11 requestWindowFeature(Window.FEATURE_NO_TITLE);
12
13 final Intent queryIntent = getIntent();
14 final String queryAction = queryIntent.getAction();
15 if (Intent.ACTION_SEARCH.equals(queryAction)) {
16 String searchKeywords = queryIntent.getStringExtra(SearchManager.QUERY);
17 doSearch(searchKeywords);
18 }
19
20 dbHelper=new DatabaseHelper(this);
21
22 c = dbHelper.getAllMagazines();
23 startManagingCursor(c);
24
25 Log.d("CURSOR COUNT", ""+c.getCount());
26
27 adapter = new SimpleCursorAdapter(this,
28 android.R.layout.simple_list_item_2, c,
29 new String[] {"editionName", "magazineName"},
30 new int[] {android.R.id.text1, android.R.id.text2});
31
32 this.setListAdapter(adapter);
33}
34
35private void doSearch(String search) {
36 dbHelper=new DatabaseHelper(this);
37
38 Cursor cur = dbHelper.searchEditions(search);
39 startManagingCursor(cur);
40
41 Log.d("CURSOR2 COUNT", ""+cur.getCount());
42
43 adapter.changeCursor(cur);
44}

1adapter.changeCursor(cur);