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我從數據庫中提取數據，返回類的實例中的值。在我的我的活動的onCreate方法，我設置的內容視圖，然後運行下面的代碼：Android TextView，使用多個變量拼接在一起的setText
val thisObject:ClassCardJ = myDBAdapter.getAddressBookEntry(cardNum)
//val textFullName:String = (thisObject.getfName().toString() + " " + thisObject.getlName().toString())
val textFirstName:String = thisObject.getfName().toString()
val textLastName:String = thisObject.getlName().toString()
firstLine.setText(textFirstName)
Toast.makeText(AddressBookEntryActivity.this, thisObject.getlName().toString(), Toast.LENGTH_SHORT).show();
它設置於firstLine文本到textFirstName值並顯示與我正在使用textLastName值舉杯。
但是，當我嘗試將firstLine的setText更改爲textFullName（取消註釋之後）時，我的程序強制關閉。我在做一些有趣的事情嗎？
按要求，我logcat的堆棧跟蹤（我試過，包括一切有關而忽略一切不相關）：
I/ActivityManager( 67): Process com.android.email (pid 330) has died.
I/ActivityManager( 67): Starting: Intent { cmp=me.snapcard/.AddressBookActivity } from pid 393
I/ActivityManager( 67): Displayed me.snapcard/.AddressBookActivity: +589ms
I/ActivityManager( 67): Starting: Intent { cmp=me.snapcard/.AddressBookEntryActivity (has extras) } from pid 393
E/dalvikvm( 393): Could not find class 'scala.collection.mutable.StringBuilder', referenced from method me.snapcard.AddressBookEntryActivity.onCreate
W/dalvikvm( 393): VFY: unable to resolve new-instance 1148 (Lscala/collection/mutable/StringBuilder;) in Lme/snapcard/AddressBookEntryActivity;
D/dalvikvm( 393): VFY: replacing opcode 0x22 at 0x0050
D/dalvikvm( 393): VFY: dead code 0x0052-0091 in Lme/snapcard/AddressBookEntryActivity;.onCreate (Landroid/os/Bundle;)V
D/AndroidRuntime( 393): Shutting down VM
W/dalvikvm( 393): threadid=1: thread exiting with uncaught exception (group=0x40015560)
E/AndroidRuntime( 393): FATAL EXCEPTION: main
E/AndroidRuntime( 393): java.lang.NoClassDefFoundError: scala.collection.mutable.StringBuilder
E/AndroidRuntime( 393): at me.snapcard.AddressBookEntryActivity.onCreate(AddressBookEntryActivity.scala:40)
E/AndroidRuntime( 393): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
E/AndroidRuntime( 393): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
E/AndroidRuntime( 393): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
E/AndroidRuntime( 393): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
E/AndroidRuntime( 393): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
E/AndroidRuntime( 393): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 393): at android.os.Looper.loop(Looper.java:130)
E/AndroidRuntime( 393): at android.app.ActivityThread.main(ActivityThread.java:3683)
E/AndroidRuntime( 393): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 393): at java.lang.reflect.Method.invoke(Method.java:507)
E/AndroidRuntime( 393): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
E/AndroidRuntime( 393): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
E/AndroidRuntime( 393): at dalvik.system.NativeStart.main(Native Method)
W/ActivityManager( 67): Force finishing activity me.snapcard/.AddressBookEntryActivity
W/ActivityManager( 67): Force finishing activity me.snapcard/.AddressBookActivity
W/ActivityManager( 67): Activity pause timeout for HistoryRecord{4082ce18 me.snapcard/.AddressBookEntryActivity}
I/dalvikvm( 67): Jit: resizing JitTable from 1024 to 2048
W/ActivityManager( 67): Launch timeout has expired, giving up wake lock!
發佈您的logcat堆棧跟蹤。 – Farhan
但爲什麼不直接使用firstLine.setText（thisObject.getfName（）。toString（）+「」+ thisObject.getlName（）。toString（））？如果你這樣做，你仍然有錯誤嗎？ – Hiral
是的，當我這樣做時，我仍然遇到錯誤。看看logcat，看起來scala.collection.mutable.StringBuilder是不知何故可能是負責構建一個像這樣的字符串（並且像我在FullName變量中那樣）。我不知道這是爲什麼，或者不是。我希望有人能夠對此有所瞭解。 – MRN