java - ConcurrentModificationException - 无法启动 Activity

Question

在 Crashlytics 中发生崩溃，我无法重现并且不知道它发生在哪里。在下面发布所有收到的日志。

Fatal Exception: java.lang.RuntimeException 
Unable to start activity ComponentInfo{.main.MainActivity}: java.util.ConcurrentModificationException 
Caused by java.util.ConcurrentModificationException
java.util.ArrayList$ArrayListIterator.next (ArrayList.java:573)
android.support.design.internal.NavigationMenuPresenter$NavigationMenuAdapter.restoreInstanceState (NavigationMenuPresenter.java:587)
android.support.design.internal.NavigationMenuPresenter.onRestoreInstanceState (NavigationMenuPresenter.java:191)

从日志中可以看到NavigationMenuPresenter和NavigationMenuAdapter是android.support.design.internal中的类。从它的名称来看，它似乎与抽屉导航菜单和一些 ArrayList 有关(如果我错了，请纠正我)。尝试恢复菜单状态时是否发生错误？

这是创建导航菜单的代码

private void setupDrawer(Toolbar toolbar) {
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.addDrawerListener(toggle);
        toggle.syncState();
        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);
        initAvailabilityChange(navigationView);
        initMenuHeaderViews(navigationView);
    }

    private void initAvailabilityChange(NavigationView navigationView) {
        switchItem = navigationView.getMenu().findItem(R.id.availability);
        CompoundButton switchView = (CompoundButton) MenuItemCompat.getActionView(switchItem);
        switchNew = (Switch) switchView.findViewById(R.id.switchLocation);
        switchView.setOnCheckedChangeListener((buttonView, isChecked) -> {
            isOnShift = isChecked;
            presenter.onAvailabilityChange(isOnShift, this);
            if (isChecked) {
                switchItem.setTitle(R.string.availability_on_shift);
            } else {
                switchItem.setTitle(R.string.availability_off_shift);
            }
        });
    }

    private void initMenuHeaderViews(NavigationView navigationView) {
        View header = navigationView.getHeaderView(0);
        tvName = (TextView) header.findViewById(R.id.tvName);
        tvRank = (TextView) header.findViewById(R.id.tvRank);
    }

非常感谢您的帮助。

Answer 1

这可能是 ViewGroup 实现的问题。尝试发布一个新的 Runnable。

switchView.post(new Runnable() {
  public void run() {
    if (isChecked) {
                switchItem.setTitle(R.string.availability_on_shift);
            } else {
                switchItem.setTitle(R.string.availability_off_shift);
            }
  }
});