私は React Native 0.60.4 を使用して Android および iOS 用のアプリを開発していますが、最近、アプリを分割画面モードまたはフリーフォーム モードにすると (画面上にアプリが 1 つだけ表示される状態から)、クラッシュすることがあるということに気付きました。
これをさらに試してみたところ、分割画面またはフリーフォーム モードでアプリを問題なく起動できることがわかりましたが、サイズを変更するとクラッシュすることがあります。以下は、Android Studio のデバッガー インスタンスからの出力ですが、理解するのに苦労しています。
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.myApp, PID: 32150
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.myApp/com.myApp.MainActivity}: androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment com.swmansion.rnscreens.Screen$ScreenFragment: calling Fragment constructor caused an exception
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3270)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
at android.app.ActivityThread.handleRelaunchActivityInner(ActivityThread.java:5279)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:5187)
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$H.handleMessage(ActivityThread.java:2016)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment com.swmansion.rnscreens.Screen$ScreenFragment: calling Fragment constructor caused an exception
at androidx.fragment.app.Fragment.instantiate(Fragment.java:465)
at androidx.fragment.app.FragmentContainer.instantiate(FragmentContainer.java:50)
at androidx.fragment.app.FragmentState.instantiate(FragmentState.java:80)
at androidx.fragment.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:3109)
at androidx.fragment.app.FragmentController.restoreAllState(FragmentController.java:158)
at androidx.fragment.app.FragmentActivity.onCreate(FragmentActivity.java:344)
at androidx.appcompat.app.AppCompatActivity.onCreate(AppCompatActivity.java:85)
at com.facebook.react.ReactActivity.onCreate(ReactActivity.java:51)
at android.app.Activity.performCreate(Activity.java:7802)
at android.app.Activity.performCreate(Activity.java:7791)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1299)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
at android.app.ActivityThread.handleRelaunchActivityInner(ActivityThread.java:5279)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:5187)
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$H.handleMessage(ActivityThread.java:2016)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:343)
at androidx.fragment.app.Fragment.instantiate(Fragment.java:443)
at androidx.fragment.app.FragmentContainer.instantiate(FragmentContainer.java:50)
at androidx.fragment.app.FragmentState.instantiate(FragmentState.java:80)
at androidx.fragment.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:3109)
at androidx.fragment.app.FragmentController.restoreAllState(FragmentController.java:158)
at androidx.fragment.app.FragmentActivity.onCreate(FragmentActivity.java:344)
at androidx.appcompat.app.AppCompatActivity.onCreate(AppCompatActivity.java:85)
at com.facebook.react.ReactActivity.onCreate(ReactActivity.java:51)
at android.app.Activity.performCreate(Activity.java:7802)
at android.app.Activity.performCreate(Activity.java:7791)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1299)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
at android.app.ActivityThread.handleRelaunchActivityInner(ActivityThread.java:5279)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:5187)
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$H.handleMessage(ActivityThread.java:2016)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: java.lang.IllegalStateException: Screen fragments should never be restored
at com.swmansion.rnscreens.Screen$ScreenFragment.<init>(Screen.java:24)
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:343)
at androidx.fragment.app.Fragment.instantiate(Fragment.java:443)
at androidx.fragment.app.FragmentContainer.instantiate(FragmentContainer.java:50)
at androidx.fragment.app.FragmentState.instantiate(FragmentState.java:80)
at androidx.fragment.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:3109)
at androidx.fragment.app.FragmentController.restoreAllState(FragmentController.java:158)
at androidx.fragment.app.FragmentActivity.onCreate(FragmentActivity.java:344)
at androidx.appcompat.app.AppCompatActivity.onCreate(AppCompatActivity.java:85)
at com.facebook.react.ReactActivity.onCreate(ReactActivity.java:51)
at android.app.Activity.performCreate(Activity.java:7802)
at android.app.Activity.performCreate(Activity.java:7791)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1299)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
at android.app.ActivityThread.handleRelaunchActivityInner(ActivityThread.java:5279)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:5187)
at android.app.servertransaction.ActivityRelaunchItem.execute(ActivityRelaunchItem.java:69)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
ベストアンサー1
これをMainActivity.javaに追加します
import android.os.Bundle;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(null);
}