我无法弄清楚如何解决此错误.我对Android和Java非常环保,因此代码将非常有用以及解释.有任何想法吗？谢谢.
LogCat：
FATAL EXCEPTION: mainERROR/AndroIDRuntime(13527): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.xxx.xxx/com.xxx.xxx.AC.List_AC}: java.lang.IllegalStateException: System services not available to ActivitIEs before onCreate()ERROR/AndroIDRuntime(13527): at androID.app.ActivityThread.performlaunchActivity(ActivityThread.java:2663)ERROR/AndroIDRuntime(13527): at androID.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)ERROR/AndroIDRuntime(13527): at androID.app.ActivityThread.access00(ActivityThread.java:125)ERROR/AndroIDRuntime(13527): at androID.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)ERROR/AndroIDRuntime(13527): at androID.os.Handler.dispatchMessage(Handler.java:99)ERROR/AndroIDRuntime(13527): at androID.os.Looper.loop(Looper.java:123)ERROR/AndroIDRuntime(13527): at androID.app.ActivityThread.main(ActivityThread.java:4627)ERROR/AndroIDRuntime(13527): at java.lang.reflect.Method.invokeNative(Native Method)ERROR/AndroIDRuntime(13527): at java.lang.reflect.Method.invoke(Method.java:521)ERROR/AndroIDRuntime(13527): at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)ERROR/AndroIDRuntime(13527): at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:626)ERROR/AndroIDRuntime(13527): at dalvik.system.NativeStart.main(Native Method)ERROR/AndroIDRuntime(13527): Caused by: java.lang.IllegalStateException: System services not available to ActivitIEs before onCreate()ERROR/AndroIDRuntime(13527): at androID.app.Activity.getSystemService(Activity.java:3526)ERROR/AndroIDRuntime(13527): at androID.Widget.ResourceCursorAdapter.<init>(ResourceCursorAdapter.java:49)ERROR/AndroIDRuntime(13527): at androID.Widget.SimpleCursorAdapter.<init>(SimpleCursorAdapter.java:84)ERROR/AndroIDRuntime(13527): at com.aeroTechnologIEs.flyDroID.AC.Adapter_AC.<init>(Adapter_AC.java:21)ERROR/AndroIDRuntime(13527): at com.xxx.xxx.AC.Set_AC_SortOrder.orderASC_Label(Set_AC_SortOrder.java:32)ERROR/AndroIDRuntime(13527): at com.xxx.xxx.AC.List_AC.run(List_AC.java:49)ERROR/AndroIDRuntime(13527): at com.xxx.xxx.StorageStateChecker.performExternalStorageOperation(StorageStateChecker.java:10)ERROR/AndroIDRuntime(13527): at com.xxx.xxx.AC.List_AC.onCreate(List_AC.java:38)ERROR/AndroIDRuntime(13527): at androID.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)ERROR/AndroIDRuntime(13527): at androID.app.ActivityThread.performlaunchActivity(ActivityThread.java:2627)ERROR/AndroIDRuntime(13527): ... 11 more在ListVIEw活动(List_AC.java)中：
public class List_AC extends ListActivity {/** * -- Called when the activity is first created * =================================================================== */@OverrIDepublic voID onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestwindowFeature(Window.FEATURE_NO_Title); setContentVIEw(R.layout.List_vIEw2); activityTitle = (TextVIEw) findVIEwByID(R.ID.TitlebarTitle); activityTitle.setText("ADVISORY CIRculaTORS"); searchList(); nextActivity(); Runnable doIfMounted = ORDER_ASC; StorageStateChecker.performExternalStorageOperation(doIfMounted );}/** * -- Check to See if the SD Card is Mounted & Loads Default List Order * ====================================================================== **/private static final Runnable ORDER_ASC = new Runnable() { public voID run() { Set_AC_SortOrder.orderASC_Label(); }};该类检查SD卡是否已挂载(StorageStateChecker.java)：
public class StorageStateChecker {public static boolean performExternalStorageOperation(Runnable doIfMounted) { if (androID.os.Environment.getExternalStorageState().equals( androID.os.Environment.MEDIA_MOUNTED)) { if (doIfMounted != null) { doIfMounted.run(); } return true; } else if (androID.os.Environment.getExternalStorageState().equals( androID.os.Environment.MEDIA_UNMOUNTED)) { //Alerts.sdCardMissing(this); } return false;}}用于调用Runnables的类(Set_AC_SortOrder.java)：
public class Set_AC_SortOrder {private static final Context List_AC = new List_AC();boolean mExternalStorageAvailable = false;boolean mExternalStorageWriteable = false;static String extStorageDirectory = Environment.getExternalStorageDirectory() .toString();static file dbfile = new file(extStorageDirectory + "/Aero-TechnologIEs/flyDroID/dB/flyDroID.db");static sqliteDatabase db = sqliteDatabase.openorCreateDatabase(dbfile, null);/** * -- Default List Order ( Label/Num Ascending) * ===================================================================== **/public static voID orderASC_Label() { Cursor databaseCursor = db.rawquery( "SELECT * FROM AC_List ORDER BY `label` ASC", null); Adapter_AC databaselistadapter = new Adapter_AC(List_AC, R.layout.List_item, databaseCursor, new String[] { "label", "Title", "description", "gotoURL" }, new int[] { R.ID.label, R.ID.ListTitle, R.ID.caption, R.ID.dummy }); databaselistadapter.notifyDataSetChanged(); ((ListActivity) List_AC).setlistadapter(databaselistadapter);}}我的适配器类(Adapter_AC.java)：
public class Adapter_AC extends SimpleCursorAdapter {static Cursor dataCursor;private LayoutInflater mInflater;public Adapter_AC(Context context, int layout, Cursor dataCursor, String[] from, int[] to) { super(context, layout, dataCursor, from, to); this.dataCursor = dataCursor; mInflater = LayoutInflater.from(context);}public VIEw getVIEw(int position, VIEw convertVIEw, VIEwGroup parent) { VIEwHolder holder; if (convertVIEw == null) { convertVIEw = mInflater.inflate(R.layout.List_item, null); holder = new VIEwHolder(); holder.text1 = (TextVIEw) convertVIEw.findVIEwByID(R.ID.label); holder.text2 = (TextVIEw) convertVIEw.findVIEwByID(R.ID.ListTitle); holder.text3 = (TextVIEw) convertVIEw.findVIEwByID(R.ID.caption); holder.text4 = (TextVIEw) convertVIEw.findVIEwByID(R.ID.dummy); holder.text4.setVisibility(VIEw.GONE); convertVIEw.setTag(holder); } else { holder = (VIEwHolder) convertVIEw.getTag(); } dataCursor.movetoposition(position); int label_index = dataCursor.getColumnIndex("label"); String label = dataCursor.getString(label_index); int Title_index = dataCursor.getColumnIndex("Title"); String Title = dataCursor.getString(Title_index); int description_index = dataCursor.getColumnIndex("description"); String description = dataCursor.getString(description_index); int goto_index = dataCursor.getColumnIndex("gotoURL"); String gotoURL = dataCursor.getString(goto_index); holder.text1.setText(label); holder.text1.setTag(label); holder.text2.setText(Title); holder.text3.setText(description); //holder.text4.setText(gotoURL); holder.text4.setTag(gotoURL); return convertVIEw;}static class VIEwHolder { TextVIEw text1; TextVIEw text2; TextVIEw text3; TextVIEw text4;}}解决方法:
我敢打赌,你正在尝试在Activity的构造函数中创建一个CursorAdapter.
活动构造函数中不提供上下文,它仅在Activity.onCreate()方法及更高版本中可用.
最重要的是……
在Activity.onCreate()中创建Cursor为null的CursorAdapter,并使用ListVIEw.getAdapter().changeCursor(newCursor)在后台线程返回填充的Cursor时分配newCursor.
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