android - fragment 更换后抽屉切换不动画

Question

我有一个带有抽屉导航的 Activity ，它可以正常工作。唯一的问题是汉堡包菜单在第一次 fragment 替换后没有动画。

public class Main extends AppCompatActivity {

// lots of attributes

@Override
protected void onCreate(Bundle in) {
    super.onCreate(in);
    setContentView(R.layout.activity_main);
    actionBar = getSupportActionBar();
    actionBar.setDisplayHomeAsUpEnabled(true);
    actionBar.setDisplayShowCustomEnabled(true);
    setupDrawer();
}

public void onEventMainThread(LoadedLEsEvent event) {
    setupDrawer();
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if (drawerToggle.onOptionsItemSelected(item)) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

void setupDrawer() {
    drawerToggle = new ActionBarDrawerToggle(this, navDrawer, R.string.drawer_open, R.string.drawer_closed) {

        public void onDrawerOpened(View drawerView) {
            super.onDrawerOpened(drawerView);
            invalidateOptionsMenu();
        }

        public void onDrawerClosed(View view) {
            super.onDrawerClosed(view);
            invalidateOptionsMenu();
        }
    };
    drawerToggle.setDrawerIndicatorEnabled(true);
    navDrawer.setDrawerListener(drawerToggle);
    menuListAdapter = new MenuListAdapter(this, R.layout.drawer_item, someList);
    menuListView.setAdapter(menuListAdapter);
    menuListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
          //Replaces the frame layout with a fragment
        }
    });
}

@Override
protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);
    drawerToggle.syncState();
}

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    // Pass any configuration change to the drawer toggles
    drawerToggle.onConfigurationChanged(newConfig);
}

所以基本上它工作正常，直到我用 fragment 替换 FrameLayout。从这里开始，抽屉仍然可以使用，但汉堡包菜单根本没有动画。

Answer 1

所以问题是我每次调用 setupDrawer() 时都初始化了 drawerToggle。将 drawerToggle = new ActionBarDrawerToggle(...) {...}; 移动到 onCreate() 就成功了。