我有以下代码:找不到错误的Android
Log.e("MainScreen", "1");
ListAction listAction = new ListAction(this);
Log.e("MainScreen", "2");
的代码只运行至满足Log.e( “MainScreen”, “1”)。然后它崩溃。然而,我不知道这是怎么可能的,因为程序永远不会到达ListAction构造函数的第一行(Log.e(“ListAction”,“1”);)另外,当我删除ListAction listAction行时,罚款。
并且所提到的构造函数:
public ListAction(Context context) {
Log.e("ListAction", "1");
this.db = new DataBaseCreation(context);
Log.e("ListAction", "2");
db.open();
Log.e("ListAction", "3");
this.bdd = db.getBDD();
Log.e("ListAction", "4");
运行代码时没有日志发布一次。
什么给?问题是什么?
输出:
03-26 03:54:54.680: E/MainScreen(534): 1
03-26 03:54:54.680: D/AndroidRuntime(534): Shutting down VM
03-26 03:54:54.690: W/dalvikvm(534): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
03-26 03:54:54.721: E/AndroidRuntime(534): FATAL EXCEPTION: main
03-26 03:54:54.721: E/AndroidRuntime(534): java.lang.RuntimeException: Unable to start activity ComponentInfo{android.GroceryListManager/android.GroceryListManager.MainScreen}: java.lang.NullPointerException
03-26 03:54:54.721: E/AndroidRuntime(534): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
MainScreen 1(从崩溃日志 – user963070 2012-03-26 03:57:19
堆栈跟踪 – edthethird 2012-03-26 03:57:26