//虚拟机执行到这句出错
Cursorc=qb.query(db,null,selection,selectionArgs,null,null,orderBy);
错误信息：
java.lang.IllegalStateException:Invalidtables
03-2415:31:08.185:E/AndroidRuntime(992):atandroid.database.sqlite.SQLiteDatabase.findEditTable(SQLiteDatabase.java:971)
03-2415:31:08.185:E/AndroidRuntime(992):atandroid.database.sqlite.SQLiteQueryBuilder.query(SQLiteQueryBuilder.java:400)
03-2415:31:08.185:E/AndroidRuntime(992):atandroid.database.sqlite.SQLiteQueryBuilder.query(SQLiteQueryBuilder.java:294)
03-2415:31:08.185:E/AndroidRuntime(992):atcom.example.testcp.FirstContentProvider.query(FirstContentProvider.java:76)
03-2415:31:08.185:E/AndroidRuntime(992):atandroid.content.ContentProvider.query(ContentProvider.java:652)
03-2415:31:08.185:E/AndroidRuntime(992):atandroid.content.ContentProvider$Transport.query(ContentProvider.java:189)
03-2415:31:08.185:E/AndroidRuntime(992):atandroid.content.ContentResolver.query(ContentResolver.java:372)
03-2415:31:08.185:E/AndroidRuntime(992):atandroid.content.ContentResolver.query(ContentResolver.java:315)
03-2415:31:08.185:E/AndroidRuntime(992):atcom.example.testcp.MainActivity$QueryListener.onClick(MainActivity.java:61)
03-2415:31:08.185:E/AndroidRuntime(992):atandroid.view.View.performClick(View.java:4204)
03-2415:31:08.185:E/AndroidRuntime(992):atandroid.view.View$PerformClick.run(View.java:17355)
03-2415:31:08.185:E/AndroidRuntime(992):atandroid.os.Handler.handleCallback(Handler.java:725)
03-2415:31:08.185:E/AndroidRuntime(992):atandroid.os.Handler.dispatchMessage(Handler.java:92)
03-2415:31:08.185:E/AndroidRuntime(992):atandroid.os.Looper.loop(Looper.java:137)
03-2415:31:08.185:E/AndroidRuntime(992):atandroid.app.ActivityThread.main(ActivityThread.java:5041)
03-2415:31:08.185:E/AndroidRuntime(992):atjava.lang.reflect.Method.invokeNative(NativeMethod)
03-2415:31:08.185:E/AndroidRuntime(992):atjava.lang.reflect.Method.invoke(Method.java:511)
03-2415:31:08.185:E/AndroidRuntime(992):atcom.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
03-2415:31:08.185:E/AndroidRuntime(992):atcom.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
03-2415:31:08.185:E/AndroidRuntime(992):atdalvik.system.NativeStart.main(NativeMethod)
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