在我的应用程序中，我有 Contacts_sync.java 类，它同步联系人和 offline_Messages.java，其中包含用户离线时收到的消息，它每五秒检查一次新消息。
现在问题出在应用程序启动时，联系人同步服务启动，并且每隔五秒另一个检查离线消息的服务也启动。
所以在这种情况下，我如何设法关闭数据库。如果我在offlineMessage 服务中关闭数据库，那么如果有任何正在进行的联系人同步过程，那么它会给我数据库关闭错误。
这是我的 Logcat
09-27 13:22:45.125: E/Database(6970): close() was never explicitly called on database 'sipchat.db'
09-27 13:22:45.125: E/Database(6970): android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here
09-27 13:22:45.125: E/Database(6970): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1849)
09-27 13:22:45.125: E/Database(6970): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:822)
09-27 13:22:45.125: E/Database(6970): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:856)
09-27 13:22:45.125: E/Database(6970): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:849)
09-27 13:22:45.125: E/Database(6970): at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:556)
09-27 13:22:45.125: E/Database(6970): at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:203)
09-27 13:22:45.125: E/Database(6970): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:118)
09-27 13:22:45.125: E/Database(6970): at org.sipchat.sipua.ui.DatabaseHelper.<init>(DatabaseHelper.java:39)
09-27 13:22:45.125: E/Database(6970): at org.sipchat.sipua.ui.Contact_sync.onCreate(Contact_sync.java:110)
09-27 13:22:45.125: E/Database(6970): at android.app.ActivityThread.handleCreateService(ActivityThread.java:1949)
09-27 13:22:45.125: E/Database(6970): at android.app.ActivityThread.access$2500(ActivityThread.java:117)
09-27 13:22:45.125: E/Database(6970): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:989)
09-27 13:22:45.125: E/Database(6970): at android.os.Handler.dispatchMessage(Handler.java:99)
09-27 13:22:45.125: E/Database(6970): at android.os.Looper.loop(Looper.java:130)
09-27 13:22:45.125: E/Database(6970): at android.app.ActivityThread.main(ActivityThread.java:3687)
09-27 13:22:45.125: E/Database(6970): at java.lang.reflect.Method.invokeNative(Native Method)
09-27 13:22:45.125: E/Database(6970): at java.lang.reflect.Method.invoke(Method.java:507)
09-27 13:22:45.125: E/Database(6970): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
09-27 13:22:45.125: E/Database(6970): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
09-27 13:22:45.125: E/Database(6970): at dalvik.system.NativeStart.main(Native Method)
任何想法和建议将不胜感激
谢谢