Android SQLite：无序调用的库例程-如何解决此崩溃？

好的，我的应用程序在安卓2.3上运行良好，在安卓4.0.4上崩溃。

我正在解析XML并将数据保存到我的SQLite数据库。

这并不是每次都会发生，但确实经常发生，有时点击按钮，有时点击新活动初创公司。。。等

崩溃异常：

11-16 15:16:41.231: E/SQLiteQuery(6398): exception: library routine called out of sequence; query: SELECT _id, name, tipus, azonosito, gpsx, gpsy, pictures, telefonok, webcim, email, nyitvatartas, cim, orszag, befogadokepesseg, szolgaltatasok, arkategoria, leiras, ertekeles, pontszam, facebook, keywords, rating FROM shops_top20

11-16 15:16:41.241: E/AndroidRuntime(6398): FATAL EXCEPTION: main
11-16 15:16:41.241: E/AndroidRuntime(6398): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.KeySoft.OpenGuide/com.KeySoft.OpenGuide.Activities.Top20}: android.database.sqlite.SQLiteMisuseException: library routine called out of sequence
11-16 15:16:41.241: E/AndroidRuntime(6398):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1968)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1993)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at android.app.ActivityThread.access$600(ActivityThread.java:127)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1159)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at android.os.Looper.loop(Looper.java:137)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at android.app.ActivityThread.main(ActivityThread.java:4507)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at java.lang.reflect.Method.invokeNative(Native Method)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at java.lang.reflect.Method.invoke(Method.java:511)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:978)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:745)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at dalvik.system.NativeStart.main(Native Method)
11-16 15:16:41.241: E/AndroidRuntime(6398): Caused by: android.database.sqlite.SQLiteMisuseException: library routine called out of sequence
11-16 15:16:41.241: E/AndroidRuntime(6398):     at android.database.sqlite.SQLiteQuery.nativeFillWindow(Native Method)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at android.database.sqlite.SQLiteQuery.fillWindow(SQLiteQuery.java:86)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at android.database.sqlite.SQLiteCursor.fillWindow(SQLiteCursor.java:164)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at android.database.sqlite.SQLiteCursor.getCount(SQLiteCursor.java:156)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at android.database.AbstractCursor.moveToPosition(AbstractCursor.java:161)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at android.database.AbstractCursor.moveToFirst(AbstractCursor.java:201)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at com.KeySoft.OpenGuide.Activities.Top20.SqlShopsVissza(Top20.java:546)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at com.KeySoft.OpenGuide.Activities.Top20.listakKirajzolasaEsValtas(Top20.java:165)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at com.KeySoft.OpenGuide.Activities.Top20.onCreate(Top20.java:113)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at android.app.Activity.performCreate(Activity.java:4469)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052)
11-16 15:16:41.241: E/AndroidRuntime(6398):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1932)

E-D-it： 好的，在我关闭应用程序中的所有db连接之前，我关闭了所有的游标，现在我得到了这个选项：

    11-16 20:00:28.409: E/AndroidRuntime(7548): FATAL EXCEPTION: main
11-16 20:00:28.409: E/AndroidRuntime(7548): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.KeySoft.OpenGuide/com.KeySoft.OpenGuide.Activities.Top20}: java.util.ConcurrentModificationException
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1968)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1993)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.app.ActivityThread.access$600(ActivityThread.java:127)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1159)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.os.Looper.loop(Looper.java:137)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.app.ActivityThread.main(ActivityThread.java:4507)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at java.lang.reflect.Method.invokeNative(Native Method)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at java.lang.reflect.Method.invoke(Method.java:511)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:978)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:745)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at dalvik.system.NativeStart.main(Native Method)
11-16 20:00:28.409: E/AndroidRuntime(7548): Caused by: java.util.ConcurrentModificationException
11-16 20:00:28.409: E/AndroidRuntime(7548):     at java.util.WeakHashMap$HashIterator.next(WeakHashMap.java:165)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.database.sqlite.SQLiteDatabase.closeClosable(SQLiteDatabase.java:1250)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.database.sqlite.SQLiteDatabase.close(SQLiteDatabase.java:1220)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.database.sqlite.SQLiteOpenHelper.close(SQLiteOpenHelper.java:265)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at com.KeySoft.OpenGuide.DB_Adapter.close(DB_Adapter.java:273)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at com.KeySoft.OpenGuide.Activities.Top20.SqlShopsVissza(Top20.java:558)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at com.KeySoft.OpenGuide.Activities.Top20.listakKirajzolasaEsValtas(Top20.java:165)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at com.KeySoft.OpenGuide.Activities.Top20.onCreate(Top20.java:113)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.app.Activity.performCreate(Activity.java:4469)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1932)

protected void getShopsFromSql(String whichTable){


            db.open();
            Cursor c;

            if(whichTable.equals("Top20")){
                c = db.getAllTop20Titles();
            }
            else if (whichTable.equals("Latest10")){
                c = db.getAllLatest10Titles();
            }
            else{
                c = db.getAllShopsFullTitles();
            }

                if (c.moveToFirst())  {
                    do  {

                        addShopToList(c.getString(1), c.getString(2), c.getString(4), c.getString(5), c.getString(12), c.getString(11), c.getString(3));
                    }while (c.moveToNext());
                }

                c.close(); 
                db.close(); //App Crashes here... why?
        }

我的代码中有问题的部分是我的Top20活动中的一个函数，它目前是以下函数：

    11-16 20:00:28.409: E/AndroidRuntime(7548): FATAL EXCEPTION: main
11-16 20:00:28.409: E/AndroidRuntime(7548): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.KeySoft.OpenGuide/com.KeySoft.OpenGuide.Activities.Top20}: java.util.ConcurrentModificationException
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1968)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1993)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.app.ActivityThread.access$600(ActivityThread.java:127)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1159)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.os.Looper.loop(Looper.java:137)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.app.ActivityThread.main(ActivityThread.java:4507)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at java.lang.reflect.Method.invokeNative(Native Method)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at java.lang.reflect.Method.invoke(Method.java:511)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:978)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:745)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at dalvik.system.NativeStart.main(Native Method)
11-16 20:00:28.409: E/AndroidRuntime(7548): Caused by: java.util.ConcurrentModificationException
11-16 20:00:28.409: E/AndroidRuntime(7548):     at java.util.WeakHashMap$HashIterator.next(WeakHashMap.java:165)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.database.sqlite.SQLiteDatabase.closeClosable(SQLiteDatabase.java:1250)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.database.sqlite.SQLiteDatabase.close(SQLiteDatabase.java:1220)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.database.sqlite.SQLiteOpenHelper.close(SQLiteOpenHelper.java:265)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at com.KeySoft.OpenGuide.DB_Adapter.close(DB_Adapter.java:273)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at com.KeySoft.OpenGuide.Activities.Top20.SqlShopsVissza(Top20.java:558)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at com.KeySoft.OpenGuide.Activities.Top20.listakKirajzolasaEsValtas(Top20.java:165)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at com.KeySoft.OpenGuide.Activities.Top20.onCreate(Top20.java:113)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.app.Activity.performCreate(Activity.java:4469)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052)
11-16 20:00:28.409: E/AndroidRuntime(7548):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1932)

protected void getShopsFromSql(String whichTable){


            db.open();
            Cursor c;

            if(whichTable.equals("Top20")){
                c = db.getAllTop20Titles();
            }
            else if (whichTable.equals("Latest10")){
                c = db.getAllLatest10Titles();
            }
            else{
                c = db.getAllShopsFullTitles();
            }

                if (c.moveToFirst())  {
                    do  {

                        addShopToList(c.getString(1), c.getString(2), c.getString(4), c.getString(5), c.getString(12), c.getString(11), c.getString(3));
                    }while (c.moveToNext());
                }

                c.close(); 
                db.close(); //App Crashes here... why?
        }

db当然是我的数据库，我在谷歌上搜索了这个错误，当然，当我想在一个线程上编辑一个值并通过另一个线程（这次是后台异步任务）迭代相同的值时，就会发生这种错误，但我有一个单例数据库适配器，我在堆栈中读到这种数据库实现最适合Android应用程序

我有一个带有单个数据库的扩展应用程序类，每次调用这个数据库时都会调用它

public class MyApp extends Application {

 private static DB_Adapter globalDatabase;


    @Override
    public void onCreate() {
        super.onCreate();

        globalDatabase = new DB_Adapter(this);
    }

    public static DB_Adapter getDB() {

        return globalDatabase;
    }

}

在我的应用程序中对数据库的引用如下：

public class Top20 extends Activity 
{


    private DB_Adapter db;
    private MyApp myApp;

    @Override
    public void onCreate(Bundle savedInstanceState){



        super.onCreate(savedInstanceState);
        setContentView(R.layout.top20);


        myApp = (MyApp) getApplication();

        db = myApp.getDB();

                    //...........morecode...etc..

因此：

我的问题是：

为什么会发生此错误？ 这个单例数据库实现我做得对吗

谢谢你的建议，

---

Adam

您似乎得到了

ConcurrentModificationException

，因为您正试图关闭数据库，而其他线程正试图访问它。在看不到其余代码的情况下，我不确定还有哪些线程访问数据库，所以很难说还有什么其他的情况

---

作为一个旁白，也许是一个更好的解决方案，您是否有理由试图关闭它？正如Google FW工程师Dianne Hackborn所说，您不需要关闭数据库，因为一旦您的进程被终止，它将自动关闭。请参阅和，以获取她对此的评论。

我发现这主要是由于未打开连接/游标造成的。检查您的代码，确保在使用完所有游标和数据库后显式地

close（）

所有游标和数据库。很快将进行检查谢谢您的建议，我将很快进行编辑。您是否使用getWritableDatabase（）或getReadableDatabase（）实例化db对象？您是否也将该代码放入了try/catch块中？