System services not available to Activities before onCreate?
I cant figure out how to fix this error. I am very green to Android and Java so code will be very helpful along with explanations. Any Ideas? Thank-you.
The LogCat:
FATAL EXCEPTION: main
ERROR/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.access$2300(ActivityThread.java:125)
ERROR/AndroidRuntime(13527): at android.app.ActivityThread$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$1.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
In the ListView Activity (List_AC.java):
public class List_AC extends ListActivity {
/**
* -- Called when the activity is first created
* ===================================================================
*/
@Override
public 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();
}
};
This class checks to see if the SD-Card is mounted (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;
}
}
The class for calling the Runnables (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);
}
}
My Adapter Class (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;
}
}
Answer
I would bet that you are trying to create a CursorAdapter in the Constructor of your Activity.
Context is not available in the Activities Constructor, it is only available in the Activity.onCreate() method and beyond.
And for a top tip...
Create the CursorAdapter with a Cursor of null in Activity.onCreate() and use ListView.getAdapter().changeCursor(newCursor) to assign newCursor once a background thread has returned a populated Cursor.