最近在改應用的一些bug,想起來可以把常見錯誤整理下,方便自己下次更快速找出錯誤原因,也給遇到同樣問題的同學提供解決思路。我會將錯誤歸類,今天先寫一點,以後再增加,歡迎指正。(為了不透漏一些資訊,log中包名被修改了)
1.
[java]
FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.evaluation/com.evaluation.VehicleActivity}: android.database.sqlite.SQLiteException: unable to close due to unfinalised statements
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2781)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2797)
at android.app.ActivityThread.access$2300(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2132)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:143)
at android.app.ActivityThread.main(ActivityThread.java:4914)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.database.sqlite.SQLiteException: unable to close due to unfinalised statements
at android.database.sqlite.SQLiteDatabase.dbclose(Native Method)
at android.database.sqlite.SQLiteDatabase.onAllReferencesReleased(SQLiteDatabase.java:363)
at android.database.sqlite.SQLiteClosable.releaseReference(SQLiteClosable.java:45)
at android.database.sqlite.SQLiteProgram.onAllReferencesReleased(SQLiteProgram.java:116)
at android.database.sqlite.SQLiteClosable.releaseReference(SQLiteClosable.java:45)
at android.database.sqlite.SQLiteProgram.close(SQLiteProgram.java:293)
at android.database.sqlite.SQLiteQuery.close(SQLiteQuery.java:133)
at android.database.sqlite.SQLiteCursor.close(SQLiteCursor.java:532)
at com.DatabaseHelper.selectAssessInformation(DatabaseHelper.java:338)
at com.JSKApplication.selectAssessInformation(JSKApplication.java:631)
at com.VehicleActivity.onCreate(VehicleActivity.java:548)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1065)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2745)
... 11 more
這個錯誤翻譯過來就是:不能關閉資料庫由於未完成的語句。
我從網上查了一下,最可能的原因是:你在操作sqlite資料庫時使用多線程了,但sqlite資料庫是不支援多線程操作,所以你必須實現多線程同步的機制。
我的程式出錯是因為:在後台啟動了個service定時向伺服器請求資料,並線上程中將資料插入資料庫。在某個時間段,使用者在向資料庫插入資料後,關閉資料庫,而此時線程正在向資料庫中寫入資料,就會造成上述異常。
作者:zj_133