大佬教程收集整理的这篇文章主要介绍了android – 如何安全地关闭游标和数据库？，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
我的logcat是 –
@H_262_2@12-16 14:49:20.774: E/Database(18611): close() was never explicitly called on database '/data/data/com.android.application/databases/appZ.db' 12-16 14:49:20.774: E/Database(18611): android.database.sqlite.DatabaSEObjectNotClosedException: Application did not close the cursor or database object that was opened here 12-16 14:49:20.774: E/Database(18611): at android.database.sqlite.sqliteDatabase.<init>(sqliteDatabase.java:1810) 12-16 14:49:20.774: E/Database(18611): at android.database.sqlite.sqliteDatabase.openDatabase(sqliteDatabase.java:817) 12-16 14:49:20.774: E/Database(18611): at android.database.sqlite.sqliteDatabase.openOrCreateDatabase(sqliteDatabase.java:851) 12-16 14:49:20.774: E/Database(18611): at android.database.sqlite.sqliteDatabase.openOrCreateDatabase(sqliteDatabase.java:844) 12-16 14:49:20.774: E/Database(18611): at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:540) 12-16 14:49:20.774: E/Database(18611): at android.content.Contextwrapper.openOrCreateDatabase(Contextwrapper.java:203) 12-16 14:49:20.774: E/Database(18611): at android.database.sqlite.sqliteOpenHelper.getWritableDatabase(sqliteOpenHelper.java:98) 12-16 14:49:20.774: E/Database(18611): at android.database.sqlite.sqliteOpenHelper.getReadableDatabase(sqliteOpenHelper.java:158) 12-16 14:49:20.774: E/Database(18611): at com.android.todoapplication.DBHelper.fetchAll(DBHelper.java:91) 12-16 14:49:20.774: E/Database(18611): at com.android.todoapplication.ApplicationActivity.sc_adapter(ApplicationActivity.java:1210) 12-16 14:49:20.774: E/Database(18611): at com.android.todoapplication.ApplicationActivity.refresh_data(ApplicationActivity.java:1195) 12-16 14:49:20.774: E/Database(18611): at com.android.todoapplication.ApplicationActivity.onKeyDown(ApplicationActivity.java:1440) 12-16 14:49:20.774: E/Database(18611): at android.view.KeyEvent.dispatch(KeyEvent.java:1037) 12-16 14:49:20.774: E/Database(18611): at android.app.Activity.dispatchKeyEvent(Activity.java:2068) 12-16 14:49:20.774: E/Database(18611): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1643) 12-16 14:49:20.774: E/Database(18611): at android.view.ViewRoot.deliverKeyEventToViewHierarchy(ViewRoot.java:2471) 12-16 14:49:20.774: E/Database(18611): at android.view.ViewRoot.handleFinishedEvent(ViewRoot.java:2441) 12-16 14:49:20.774: E/Database(18611): at android.view.ViewRoot.handlemessage(ViewRoot.java:1735) 12-16 14:49:20.774: E/Database(18611): at android.os.Handler.dispatchmessage(Handler.java:99) 12-16 14:49:20.774: E/Database(18611): at android.os.Looper.loop(Looper.java:123) 12-16 14:49:20.774: E/Database(18611): at android.app.ActivityThread.main(ActivityThread.java:4627) 12-16 14:49:20.774: E/Database(18611): at java.lang.reflect.Method.invokeNative(Native Method) 12-16 14:49:20.774: E/Database(18611): at java.lang.reflect.Method.invoke(Method.java:521) 12-16 14:49:20.774: E/Database(18611): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 12-16 14:49:20.774: E/Database(18611): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 12-16 14:49:20.774: E/Database(18611): at dalvik.system.NativeStart.main(Native Method)我从here提到了一些东西.他们告诉使用getReadableDatabase().我也使用该方法.而且,我也使用这种方法,
@H_262_2@public cursor fetchAll() { sqliteDatabase db = this.getReadableDatabase(); cursor cursor = db.query(t1,prior); if (cursor!=null) { cursor.close(); } if (db!=null) { db.close(); } return cursor; }之后有错误 –
@H_262_2@Database wasn't open.完成后可以关闭光标,如下所示：
@H_262_2@cursor cursor = fetchAll(); ... // Do your work with the cursor cursor.close();或者如果您使用活动中的游标,并且需要重新排序(活动重新启动,停止…),您可以使用以下命令：
@H_262_2@cursor cursor = fetchAll(); startManagingcursor(cursor); // Android will take care of the cursor for you // Do your work with the cursor关闭数据库(关闭游标后,或者最好在onDestroy()中的活动内)：
@H_262_2@dbHelper.close();以上是大佬教程为你收集整理的android – 如何安全地关闭游标和数据库？全部内容，希望文章能够帮你解决android – 如何安全地关闭游标和数据库？所遇到的程序开发问题。
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