Question

Possible Duplicate:
System services not available to Activities before onCreate?

I am trying to return the values of a database to a listview but I am getting an error. I am using a cursor to get the data from a table and a SimpleCursorAdapter to read the cursor. This is the method that does this:

public void getData(){
        String[] columns = new String[] {ModuleDB.KEY_ROWID, 
                ModuleDB.KEY_MODCODE,
                ModuleDB.KEY_MODNAME,
                ModuleDB.KEY_LECPRAC,
                ModuleDB.KEY_DAYS,
                ModuleDB.KEY_TIMESTART,
                ModuleDB.KEY_TIMEEND,
                ModuleDB.KEY_LOCATION,
                ModuleDB.KEY_INFO};
        int[] to = new int[]{R.id.modcode_entry,
                             R.id.modname_entry,
                             R.id.modlecprac_entry,
                             R.id.modday_entry,
                             R.id.modtimestart_entry,
                             R.id.modtimeend_entry,
                             R.id.modlocation_entry,
                             R.id.modaddinfo_entry};

        Cursor curs = myDatabase.query(ModuleDB.DB_TABLE, columns, null, null, null, null, null);
        if (curs != null)
            curs.moveToFirst();

        SimpleCursorAdapter dataSource = new SimpleCursorAdapter(ModuleDataSource.this, R.layout.list_entry, curs, columns, to);
        this.setListAdapter(dataSource);

        // Make sure to close the cursor
        curs.close();
        }

This method is causing the exception: "System Services not available to activites before onCreate()"

Can anyone help me with this? I can’t find any good tutorials for cursors and cursoradapters and I really am completely lost

EDIT:

This might help.

MainActivity.java

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ModuleDataSource dbinfo = new ModuleDataSource(this);
        dbinfo.open();
        dbinfo.getData();
        dbinfo.close();
    }

ModuleDataSource.java

public class ModuleDataSource extends ListActivity{

    private SQLiteDatabase myDatabase;
    private ModuleDB myhelper;

    public ModuleDataSource(Context context){
        myhelper = new ModuleDB(context);
    }

    public void open() throws SQLException { //Open the database for writing
        myDatabase = myhelper.getWritableDatabase();
    }

    public void close(){ //Close the database
        myhelper.close();
    }

    public void getData(){
        String[] columns = new String[] {ModuleDB.KEY_ROWID, 
                ModuleDB.KEY_MODCODE,
                ModuleDB.KEY_MODNAME,
                ModuleDB.KEY_LECPRAC,
                ModuleDB.KEY_DAYS,
                ModuleDB.KEY_TIMESTART,
                ModuleDB.KEY_TIMEEND,
                ModuleDB.KEY_LOCATION,
                ModuleDB.KEY_INFO};
        int[] to = new int[]{R.id.modcode_entry,
                             R.id.modname_entry,
                             R.id.modlecprac_entry,
                             R.id.modday_entry,
                             R.id.modtimestart_entry,
                             R.id.modtimeend_entry,
                             R.id.modlocation_entry,
                             R.id.modaddinfo_entry};

        Cursor curs = myDatabase.query(ModuleDB.DB_TABLE, columns, null, null, null, null, null);
        startManagingCursor(curs);

        if (curs != null)
            curs.moveToFirst();

        SimpleCursorAdapter dataSource = new SimpleCursorAdapter(ModuleDataSource.this, R.layout.list_entry, curs, columns, to);
        setListAdapter(dataSource);

        }
}

EDIT2: Logcat

11-06 23:24:07.885: D/AndroidRuntime(887): Shutting down VM
11-06 23:24:07.885: W/dalvikvm(887): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
11-06 23:24:07.895: E/AndroidRuntime(887): FATAL EXCEPTION: main
11-06 23:24:07.895: E/AndroidRuntime(887): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.adoherty.assignment3/com.adoherty.assignment3.MainActivity}: 
                                          java.lang.IllegalStateException: System services not available to Activities before onCreate()
11-06 23:24:07.895: E/AndroidRuntime(887):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
11-06 23:24:07.895: E/AndroidRuntime(887):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
11-06 23:24:07.895: E/AndroidRuntime(887):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
11-06 23:24:07.895: E/AndroidRuntime(887):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
11-06 23:24:07.895: E/AndroidRuntime(887):  at android.os.Handler.dispatchMessage(Handler.java:99)
11-06 23:24:07.895: E/AndroidRuntime(887):  at android.os.Looper.loop(Looper.java:123)
11-06 23:24:07.895: E/AndroidRuntime(887):  at android.app.ActivityThread.main(ActivityThread.java:4627)
11-06 23:24:07.895: E/AndroidRuntime(887):  at java.lang.reflect.Method.invokeNative(Native Method)
11-06 23:24:07.895: E/AndroidRuntime(887):  at java.lang.reflect.Method.invoke(Method.java:521)
11-06 23:24:07.895: E/AndroidRuntime(887):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
11-06 23:24:07.895: E/AndroidRuntime(887):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
11-06 23:24:07.895: E/AndroidRuntime(887):  at dalvik.system.NativeStart.main(Native Method)
11-06 23:24:07.895: E/AndroidRuntime(887): Caused by: java.lang.IllegalStateException: System services not available to Activities before onCreate()
11-06 23:24:07.895: E/AndroidRuntime(887):  at android.app.Activity.getSystemService(Activity.java:3526)
11-06 23:24:07.895: E/AndroidRuntime(887):  at android.widget.ResourceCursorAdapter.<init>(ResourceCursorAdapter.java:49)
11-06 23:24:07.895: E/AndroidRuntime(887):  at android.widget.SimpleCursorAdapter.<init>(SimpleCursorAdapter.java:84)
11-06 23:24:07.895: E/AndroidRuntime(887):  at com.adoherty.assignment3.ModuleDataSource.getData(ModuleDataSource.java:74)
11-06 23:24:07.895: E/AndroidRuntime(887):  at com.adoherty.assignment3.MainActivity.onCreate(MainActivity.java:17)
11-06 23:24:07.895: E/AndroidRuntime(887):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
11-06 23:24:07.895: E/AndroidRuntime(887):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
11-06 23:24:07.895: E/AndroidRuntime(887):  ... 11 more

Answer 1

ModuleDataSource extends ListActivity.. you are creating an instance of that within your Activity.. You cannot instantiate an activity as an object like that

Your ListActivity is likely trying to make some system call that it normally makes in the background automatically for you. Since you are trying to instantiate a ListActivity as an object, the normal Activity process is not happening…

You should move what you have in the ListActivity into your main activity and make your main activity the ListActivity

Something like this:

public class MainActivity extends ListActivity {

    private SQLiteDatabase myDatabase;
    private ModuleDB myhelper;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        myhelper = new ModuleDB(this);
        open();
        getData();
        close();
    }

    public void open() throws SQLException { //Open the database for writing
        myDatabase = myhelper.getWritableDatabase();
    }

    public void close(){ //Close the database
        myhelper.close();
    }

    public void getData(){
        String[] columns = new String[] {ModuleDB.KEY_ROWID, 
                ModuleDB.KEY_MODCODE,
                ModuleDB.KEY_MODNAME,
                ModuleDB.KEY_LECPRAC,
                ModuleDB.KEY_DAYS,
                ModuleDB.KEY_TIMESTART,
                ModuleDB.KEY_TIMEEND,
                ModuleDB.KEY_LOCATION,
                ModuleDB.KEY_INFO};
        int[] to = new int[]{R.id.modcode_entry,
                             R.id.modname_entry,
                             R.id.modlecprac_entry,
                             R.id.modday_entry,
                             R.id.modtimestart_entry,
                             R.id.modtimeend_entry,
                             R.id.modlocation_entry,
                             R.id.modaddinfo_entry};

        Cursor curs = myDatabase.query(ModuleDB.DB_TABLE, columns, null, null, null, null, null);
        startManagingCursor(curs);

        SimpleCursorAdapter dataSource = new SimpleCursorAdapter(ModuleDataSource.this, R.layout.list_entry, curs, columns, to);
        setListAdapter(dataSource);

        }
}