"Unable to instantiate fragment" when restore app from background after a long time

[Mohammad-Adam]

Stack trace:

at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2904)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2986)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1671)
at android.os.Handler.dispatchMessage(Handler.java:108)
at android.os.Looper.loop(Looper.java:206)
at android.app.ActivityThread.main(ActivityThread.java:6784)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:852)
at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:108)
Caused by: androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment com.********.ui.PrivateOnlinePostsFragments: could not find Fragment constructor
at androidx.fragment.app.Fragment.instantiate(Fragment.java:563)
at androidx.fragment.app.FragmentContainer.instantiate(FragmentContainer.java:57)
at androidx.fragment.app.FragmentManager$3.instantiate(FragmentManager.java:390)
at androidx.fragment.app.FragmentStateManager.<init>(FragmentStateManager.java:74)
at androidx.fragment.app.FragmentManager.restoreSaveState(FragmentManager.java:2466)
at androidx.fragment.app.FragmentController.restoreSaveState(FragmentController.java:196)
at androidx.fragment.app.FragmentActivity.onCreate(FragmentActivity.java:287)
at androidx.appcompat.app.AppCompatActivity.onCreate(AppCompatActivity.java:115)
at com.********.ui.MainActivity.onCreate(MainActivity.kt:63)
at android.app.Activity.performCreate(Activity.java:6984)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1235)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2857)
... 10 more
Caused by: java.lang.NoSuchMethodException: <init> []
at java.lang.Class.getConstructor0(Class.java:2320)
at java.lang.Class.getConstructor(Class.java:1725)
at androidx.fragment.app.Fragment.instantiate(Fragment.java:548)
... 21 more

frag-nav:3.3.0

[Mohammad-Adam]

using super.onCreate(null) in MainActivity's onCreate as a workaround for now

[Antarix]

This happen when we use parameterized constructor for fragment. If you want to pass parameter in fragment, then try passing it in bundle e.g in your case

public static final PrivateOnlinePostsFragments newInstance(int title, String message){
    PrivateOnlinePostsFragments fragment = new PrivateOnlinePostsFragments();
    Bundle bundle = new Bundle(2);
    bundle.putInt(EXTRA_TITLE, title);
    bundle.putString(EXTRA_MESSAGE, message);
    fragment.setArguments(bundle);
    return fragment ;
}