Google Play控制台上的片段$InstantiationException | NoSuchMethodException

Question

基于一些答案，已经为Fragments添加了一个默认构造函数，但是，我们仍然在游戏控制台上遇到了以下崩溃。

  java.lang.RuntimeException: 
  at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:3488)
  at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:3635)
  at android.app.ActivityThread.handleRelaunchActivityInner (ActivityThread.java:5582)
  at android.app.ActivityThread.handleRelaunchActivity (ActivityThread.java:5490)
  at android.app.servertransaction.ActivityRelaunchItem.execute (ActivityRelaunchItem.java:69)
  at android.app.servertransaction.TransactionExecutor.executeCallbacks (TransactionExecutor.java:135)
  at android.app.servertransaction.TransactionExecutor.execute (TransactionExecutor.java:95)
  at android.app.ActivityThread$H.handleMessage (ActivityThread.java:2175)
  at android.os.Handler.dispatchMessage (Handler.java:107)
  at android.os.Looper.loop (Looper.java:237)
  at android.app.ActivityThread.main (ActivityThread.java:7860)
  at java.lang.reflect.Method.invoke (Method.java)
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:493)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1075)
Caused by: androidx.fragment.app.Fragment$InstantiationException: 
  at androidx.fragment.app.Fragment.instantiate (Fragment.java:94)
  at androidx.fragment.app.FragmentContainer.instantiate (FragmentContainer.java)
  at androidx.fragment.app.FragmentManager$3.instantiate (FragmentManager.java:9)
  at androidx.fragment.app.FragmentStateManager.<init> (FragmentStateManager.java:10)
  at androidx.fragment.app.FragmentManager.restoreSaveState (FragmentManager.java:96)
  at androidx.fragment.app.FragmentController.restoreSaveState (FragmentController.java:8)
  at androidx.fragment.app.FragmentActivity.onCreate (FragmentActivity.java:17)
  at androidx.appcompat.app.AppCompatActivity.onCreate (AppCompatActivity.java:10)
  at com.companyname.activities.BaseActivity.onCreate (BaseActivity.java)
  at com.companyname.activities.Activity1.onCreate (Activity1.java)
  at android.app.Activity.performCreate (Activity.java:7955)
  at android.app.Activity.performCreate (Activity.java:7944)
  at android.app.Instrumentation.callActivityOnCreate (Instrumentation.java:1307)
  at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:3463)
  at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:3635)
  at android.app.ActivityThread.handleRelaunchActivityInner (ActivityThread.java:5582)
  at android.app.ActivityThread.handleRelaunchActivity (ActivityThread.java:5490)
  at android.app.servertransaction.ActivityRelaunchItem.execute (ActivityRelaunchItem.java:69)
  at android.app.servertransaction.TransactionExecutor.executeCallbacks (TransactionExecutor.java:135)
  at android.app.servertransaction.TransactionExecutor.execute (TransactionExecutor.java:95)
  at android.app.ActivityThread$H.handleMessage (ActivityThread.java:2175)
  at android.os.Handler.dispatchMessage (Handler.java:107)
  at android.os.Looper.loop (Looper.java:237)
  at android.app.ActivityThread.main (ActivityThread.java:7860)
  at java.lang.reflect.Method.invoke (Method.java)
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:493)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1075)
Caused by: java.lang.NoSuchMethodException: 
  at java.lang.Class.getConstructor0 (Class.java:2332)
  at java.lang.Class.getConstructor (Class.java:1728)
  at androidx.fragment.app.Fragment.instantiate (Fragment.java:15)
  at androidx.fragment.app.FragmentContainer.instantiate (FragmentContainer.java)
  at androidx.fragment.app.FragmentManager$3.instantiate (FragmentManager.java:9)
  at androidx.fragment.app.FragmentStateManager.<init> (FragmentStateManager.java:10)
  at androidx.fragment.app.FragmentManager.restoreSaveState (FragmentManager.java:96)
  at androidx.fragment.app.FragmentController.restoreSaveState (FragmentController.java:8)
  at androidx.fragment.app.FragmentActivity.onCreate (FragmentActivity.java:17)
  at androidx.appcompat.app.AppCompatActivity.onCreate (AppCompatActivity.java:10)
  at com.companyname.activities.BaseActivity.onCreate (BaseActivity.java)
  at com.companyname.activities.Activity1.onCreate (Activity1.java)
  at android.app.Activity.performCreate (Activity.java:7955)
  at android.app.Activity.performCreate (Activity.java:7944)
  at android.app.Instrumentation.callActivityOnCreate (Instrumentation.java:1307)
  at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:3463)
  at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:3635)
  at android.app.ActivityThread.handleRelaunchActivityInner (ActivityThread.java:5582)
  at android.app.ActivityThread.handleRelaunchActivity (ActivityThread.java:5490)
  at android.app.servertransaction.ActivityRelaunchItem.execute (ActivityRelaunchItem.java:69)
  at android.app.servertransaction.TransactionExecutor.executeCallbacks (TransactionExecutor.java:135)
  at android.app.servertransaction.TransactionExecutor.execute (TransactionExecutor.java:95)
  at android.app.ActivityThread$H.handleMessage (ActivityThread.java:2175)
  at android.os.Handler.dispatchMessage (Handler.java:107)
  at android.os.Looper.loop (Looper.java:237)
  at android.app.ActivityThread.main (ActivityThread.java:7860)
  at java.lang.reflect.Method.invoke (Method.java)
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:493)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1075)

Answer 1

你做的构造函数没有任何参数吗？

例如

public YourFragment() {
  // Do not anything!!!
}