4
我有运行读写SQLite数据库多线程绑定服务。我创建了一个我的数据库帮助程序的实例，并在我的服务的onCreate中获得数据库连接，这应该在主线程上执行。因为它是一个绑定服务，所以应该只有一个服务实例在内存中。但是，当服务试图打开数据库或其中一个线程尝试执行语句时，偶尔我仍会遇到异常。Android的SQLite数据库被锁定
服务代码：
@Override
public void onCreate() {
super.onCreate();
MyDatabaseHelper helper = new MyDatabaseHelper(this);
database = helper.getWritableDatabase();
}
例外：
java.lang.RuntimeException: Unable to create service uk.co.example.service.MyService:
android.database.sqlite.SQLiteException: unable to open database file
at android.app.ActivityThread.handleCreateService(ActivityThread.java:1959)
at android.app.ActivityThread.access$2500(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:989)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:3691)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.database.sqlite.SQLiteException: unable to open database file
at android.database.sqlite.SQLiteDatabase.dbopen(Native Method)
at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1960)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:887)
at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:965)
at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:958)
at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:585)
at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:203)
at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:118)
at uk.co.example.service.MyService.onCreate(MyService.java:69)
at android.app.ActivityThread.handleCreateService(ActivityThread.java:1949)
... 10 more
android.database.sqlite.SQLiteException: error code 5: database is locked
at android.database.sqlite.SQLiteStatement.native_execute(Native Method)
at android.database.sqlite.SQLiteStatement.execute(SQLiteStatement.java:61)
at uk.co.example.a.a.a.a(MyTable.java:147)
at uk.co.example.service.b.a.m.run(MySaveTask.java:84)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
at java.lang.Thread.run(Thread.java:1019)
任何想法可能是造成这个？
感谢
大卫
发表您的服务完整的源代码....... –
以及正常数据库时，已经是正在与数据库中的一个线程，所以可能你的一个线程正在与数据库，你忘了被锁关闭连接。 – Raykud
[添加到Raykud答案] ...或者你跳过密切关系的代码有一个例外。 – k3b