求好心人帮我看看这个日志是什么问题啊~~ 困扰了好几天了

Question

java.lang.RuntimeException: Unable to start receiver www.csy.com.adress.NetworkConnectChangedReceiver: java.lang.NullPointerException: Attempt to invoke virtual method 'android.database.Cursor android.database.sqlite.SQLiteDatabase.query(java.lang.String, java.lang.String[], java.lang.String, java.lang.String[], java.lang.String, java.lang.String, java.lang.String)' on a null object reference
at android.app.ActivityThread.handleReceiver(ActivityThread.java:2766)
at android.app.ActivityThread.access$1700(ActivityThread.java:169)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1500)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5556)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:967)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:762)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.database.Cursor android.database.sqlite.SQLiteDatabase.query(java.lang.String, java.lang.String[], java.lang.String, java.lang.String[], java.lang.String, java.lang.String, java.lang.String)' on a null object reference
at www.csy.com.adress.Adress.onNetChange(Adress.java:205)
at www.csy.com.adress.NetworkConnectChangedReceiver.onReceive(NetworkConnectChangedReceiver.java:17)
at android.app.ActivityThread.handleReceiver(ActivityThread.java:2759)
... 9 more

Answer 1

你检查下代码看是不是那块运行的时候出现空指针异常了