小编use*_*547的帖子

我的数据库出了问题.当应用程序启动时,它应该创建带有表的数据库(如果它们不存在),但应用程序在启动后立即崩溃.当我打开logcat后关闭数据库告诉我"我想打开一个已经关闭的对象",当我没有关闭数据库时,我得到错误" getReadableDatabase called recursively".我不知道该怎么做.有时它可以工作,但是当我取消应用程序并再次安装它们时,错误就会出现.

没有关闭的错误:

02-20 11:50:06.980: E/AndroidRuntime(15375): FATAL EXCEPTION: main
02-20 11:50:06.980: E/AndroidRuntime(15375): java.lang.RuntimeException: Unable to start activity ComponentInfo{de.vertretungsplan2/de.vertretungsplan2.Main}: java.lang.IllegalStateException: getDatabase called recursively
02-20 11:50:06.980: E/AndroidRuntime(15375):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2339)
02-20 11:50:06.980: E/AndroidRuntime(15375):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2389)
02-20 11:50:06.980: E/AndroidRuntime(15375):    at android.app.ActivityThread.access$600(ActivityThread.java:153)
02-20 11:50:06.980: E/AndroidRuntime(15375):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1269)
02-20 11:50:06.980: E/AndroidRuntime(15375):    at android.os.Handler.dispatchMessage(Handler.java:99)
02-20 11:50:06.980: E/AndroidRuntime(15375):    at android.os.Looper.loop(Looper.java:137)
02-20 11:50:06.980: E/AndroidRuntime(15375):    at android.app.ActivityThread.main(ActivityThread.java:5289)
02-20 11:50:06.980: E/AndroidRuntime(15375):    at java.lang.reflect.Method.invokeNative(Native Method)
02-20 11:50:06.980: E/AndroidRuntime(15375):    at java.lang.reflect.Method.invoke(Method.java:525)
02-20 11:50:06.980: E/AndroidRuntime(15375):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739)
02-20 11:50:06.980: E/AndroidRuntime(15375):    at …

我的程序有问题.我使用数据库来保存我的应用程序的设置.当我在应用程序中保存密码时一切正常,但是当我保存"学校类"的名称时原则上使用相同的方法,但另一个表崩溃并且我收到此错误:

02-19 15:32:04.070: E/AndroidRuntime(14349): FATAL EXCEPTION: main
02-19 15:32:04.070: E/AndroidRuntime(14349): java.lang.NullPointerException
02-19 15:32:04.070: E/AndroidRuntime(14349):    at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:224)
02-19 15:32:04.070: E/AndroidRuntime(14349):    at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164)
02-19 15:32:04.070: E/AndroidRuntime(14349):    at de.vertretungsplan2.helper.DBHandler.insertKurs(DBHandler.java:95)
02-19 15:32:04.070: E/AndroidRuntime(14349):    at de.vertretungsplan2.tabswipe.adapter.KurseFragment$1.onItemClick(KurseFragment.java:38)
02-19 15:32:04.070: E/AndroidRuntime(14349):    at android.widget.AdapterView.performItemClick(AdapterView.java:297)
02-19 15:32:04.070: E/AndroidRuntime(14349):    at android.widget.AbsListView.performItemClick(AbsListView.java:1100)
02-19 15:32:04.070: E/AndroidRuntime(14349):    at android.widget.AbsListView$PerformClick.run(AbsListView.java:2788)
02-19 15:32:04.070: E/AndroidRuntime(14349):    at android.widget.AbsListView$1.run(AbsListView.java:3463)
02-19 15:32:04.070: E/AndroidRuntime(14349):    at android.os.Handler.handleCallback(Handler.java:730)
02-19 15:32:04.070: E/AndroidRuntime(14349):    at android.os.Handler.dispatchMessage(Handler.java:92)
02-19 15:32:04.070: E/AndroidRuntime(14349):    at android.os.Looper.loop(Looper.java:137)
02-19 15:32:04.070: E/AndroidRuntime(14349):    at android.app.ActivityThread.main(ActivityThread.java:5289)
02-19 15:32:04.070: E/AndroidRuntime(14349):    at java.lang.reflect.Method.invokeNative(Native Method)
02-19 15:32:04.070: E/AndroidRuntime(14349): …