kotlin - Kotlin - 应用程序在 ObjectInputStream 行启动时崩溃
问题描述
我的应用程序在 ObjectInputStream 行启动时崩溃,我不确定为什么会这样,它调用上面的 openInputFile 命令来获取所需的文件,但在启动时使整个问题崩溃。
我已尝试从该行中删除活动标签,但到目前为止还没有任何效果
private fun loadList() {
try {
val fileInputStream = activity?.openFileInput("starWarsList.dat")
val objectInputStream = ObjectInputStream(fileInputStream)
@Suppress("UNCHECKED_CAST")
val list = objectInputStream.readObject() as? MutableList<StarWarsItem>
if (list != null) {
adapter.list = list
}
objectInputStream.close()
fileInputStream?.close()
} catch (e: java.io.FileNotFoundException) {
Toast.makeText(activity, "no existing list found", Toast.LENGTH_LONG).show()
}
}
最终结果是应用程序正确加载,因此我能够完成项目的其余部分,但如上所述,应用程序在此行启动时崩溃。
任何输入都将不胜感激。
编辑:启动时收到错误
2019-02-11 08:14:51.432 19116-19116/com.example.assignment E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.assignment, PID: 19116
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:503)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.io.EOFException
at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2344)
at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:2813)
at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:804)
at java.io.ObjectInputStream.<init>(ObjectInputStream.java:301)
at com.example.assignment.StarWarsList.loadList(StarWarsList.kt:52)
at com.example.assignment.StarWarsList.onActivityCreated(StarWarsList.kt:46)
at android.support.v4.app.Fragment.performActivityCreated(Fragment.java:2460)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1483)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1784)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1852)
at android.support.v4.app.FragmentManagerImpl.dispatchStateChange(FragmentManager.java:3269)
at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:3229)
at android.support.v4.app.FragmentController.dispatchActivityCreated(FragmentController.java:201)
at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:620)
at android.support.v7.app.AppCompatActivity.onStart(AppCompatActivity.java:178)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1391)
at android.app.Activity.performStart(Activity.java:7157)
at android.app.ActivityThread.handleStartActivity(ActivityThread.java:2937)
at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:180)
at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:165)
at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:142)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:70)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
2019-02-11 08:14:51.513 19116-19116/com.example.assignment I/Process: Sending signal. PID: 19116 SIG: 9
解决方案
看起来您有一个空文件,没有要序列化的内容。我建议在阅读之前转储文件的二进制内容.dat
或其长度。
如果它无效,请将其替换为有效的默认值。
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