android - popBackStack 中的非法状态异常

Question

在我的应用程序中，我使用的是 BottomBar 菜单。快速选择菜单时，我会收到有关 crashlytics 的崩溃报告(仅在某些设备中)。这是堆栈跟踪

Non-fatal Exception: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1842) at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1860) at android.support.v4.app.FragmentManagerImpl.popBackStack(FragmentManager.java:781) at com.beco.ibeco.app.MainActivity$1.onMenuTabSelected(MainActivity.java:87) at com.beco.ibeco.app.views.bottombar.BottomBar.notifyMenuListener(BottomBar.java:1239) at com.beco.ibeco.app.views.bottombar.BottomBar.updateSelectedTab(BottomBar.java:1199) at com.beco.ibeco.app.views.bottombar.BottomBar.handleClick(BottomBar.java:1161) at com.beco.ibeco.app.views.bottombar.BottomBar.onClick(BottomBar.java:1149) at android.view.View.performClick(View.java:5076) at android.view.View$PerformClick.run(View.java:20279) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5930) at java.lang.reflect.Method.invoke(Method.java) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)
And here is the code

protected void onCreate(Bundle savedInstanceState) {
        mActive = true;
        super.onCreate(savedInstanceState);
        initBottomBar(savedInstanceState);
        Intent intent = getIntent();
    }  
private void initBottomBar(Bundle savedInstanceState) {
        mBottomBar = BottomBar.attach(this, savedInstanceState);
        mBottomBar.useFixedMode();
        mBottomBar.noTabletGoodness();
        mBottomBar.setItemsFromMenu(R.menu.bottombar_menu, new OnMenuTabClickListener() {
            @Override
            public void onMenuTabSelected(@IdRes int menuItemId) {

                FragmentManager fragmentManager = getSupportFragmentManager();
                fragmentManager.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);//line 87

                switch (menuItemId) {

                    case R.id.bottomBarHome:
                        showStoreList();
                        break;

                    case R.id.bottomBarMap:
                        showMap();
                        break;

                    case R.id.bottomBarDeal:
                        showDeals();
                        break;

                    case R.id.bottomBarSettings:
                        showSettings();
                        break;

                    case R.id.bottomBarNotification:
                        if (mNotificationBadge != null) {
                            mNotificationBadge.hide();
                            Beco.getApp().clearBadge();
                        }
                        showNotifications();
                        break;
                }
            }

            @Override
            public void onMenuTabReSelected(@IdRes int menuItemId) {
                switch (menuItemId) {
                    case R.id.bottomBarHome:
                        if (mCurrentTab != HOME)
                            showStoreList();
                        break;

                    case R.id.bottomBarMap:
                        if (mCurrentTab != MAP)
                            showMap();
                        break;

                    case R.id.bottomBarDeal:
                        if (mCurrentTab != DEAL)
                            showDeals();
                        break;

                    case R.id.bottomBarNotification:
                        if(mCurrentTab != NOTIFICATION) {
                            if (mNotificationBadge != null) {
                                mNotificationBadge.hide();
                                mNotificationBadge.setDealItemCount(0);
                                Beco.getApp().clearBadge();
                            }
                            showNotifications();
                        }
                        break;

                    case R.id.bottomBarSettings:
                        if (mCurrentTab != SETTINGS)
                            showSettings();
                        break;
                }
            }
        });

        mNotificationBadge = mBottomBar.makeBadgeForTabAt(3, R.color.beco_badge_color, Beco.getApp().getBadgeCount());
    }  
@Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        mBottomBar.onSaveInstanceState(outState);
    }  

如何解决这个问题？

Answer 1

创建一个 bool 值并检查 Activity 是否不会暂停

@Override
public void onResume() {
    super.onResume();
    mIsResumed = true;
}

@Override
public void onPause() {
    mIsResumed = false;
    super.onPause();
}

然后在加载 fragment 检查时

if(mIsResumed){
    FragmentManager fragmentManager = getSupportFragmentManager(); 
    fragmentManager.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);//line 8
}