java.lang.NullPointerException:尝试在dkw.a.a(未知源)处的空对象引用上调用接口方法'java.util.Iteratorjava.util.List.iterator135)在android.app.ActivityThread.main(ActivityThread.java:5930) at java.lang.reflect.Method.invoke(原生方法
复制之后,我尝试在FOR循环中迭代'team_memebers‘,但是我得到了一个’空对象引用‘错误。“用户”列表包含返回的对象,通过调试打印进行测试。activity ComponentInfo{il.ac.shenkar.david.todolistex2/il.ac.shenkar.david.todolistex2.ListNodeActivity}: java.lang.NullPointerException: Attempt to invoke interface met
Unable to start activity ComponentInfo{plp.cs4b.thesis.drawitapp/plp.cs4b.thesis.drawitapp.PlayGame}: java.lang.NullPointerExceptionAttempt to invoke virtual method 'java.lang.String plp.cs4b.thesis.drawitapp.Player.getName()' on a nullZygoteInit.java:899)
at com
所以我试着在Youtube上搜索: "Attempt to invoke interface method 'int android.database.Cursor.getCount()' on a nullto start activity ComponentInfo{com.example.budgetcalculator/com.example.budgetcalculator.Summary}: java.lang.NullPointerException: Attempt to invoke interfac
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.chill.leoj.burp/com.chill.leoj.burp.Photos}: java.lang.NullPointerException: Attempt to invoke interface method 'boolean android.database.Cursor.moveToFirst()' on a null objectcom.android.internal