Drawer/Back ActionBar 中的按钮在返回时不可点击

Drawer/Back button in ActionBar not clickable when in back

我使用了我在此处找到的解决方案,当后退堆栈中没有任何内容时,操作栏上的左按钮用作抽屉切换,而当有时返回按钮。这是实现

@Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity);
    ButterKnife.bind(this);
    setSupportActionBar(mToolbar);
    final ActionBar actionBar = getSupportActionBar();
    if (actionBar != null) {
      actionBar.setDisplayShowHomeEnabled(true);
      actionBar.setDisplayHomeAsUpEnabled(true);
    }
    navigateTo(R.id.menu_drawer);
    initDrawer();
    mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, mToolbar,
        R.string.main_open_menu, R.string.main_close_menu)
    {
      public void onDrawerClosed(View view){
        syncActionBarState();
      }

      public void onDrawerOpened(View view){
        mDrawerToggle.setDrawerIndicatorEnabled(true);
      }
    };
    mOnBackStackChangedListener =
        new android.support.v4.app.FragmentManager.OnBackStackChangedListener() {
      @Override
      public void onBackStackChanged() {
        syncActionBarState();
      }
    };
    mDrawerLayout.setDrawerListener(mDrawerToggle);
    getSupportFragmentManager().addOnBackStackChangedListener(mOnBackStackChangedListener);
  }


  private void syncActionBarState(){
    int backStackCount = getSupportFragmentManager().getBackStackEntryCount();
    mDrawerToggle.setDrawerIndicatorEnabled(backStackCount == 0);
    if(backStackCount == 0){
      mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
    }else{
      mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
    }
  }

作为抽屉切换按钮工作正常。当用作后退按钮时,它甚至不会触发 OnOptionsItemClickListener。我错过了什么?

您已将 setDisplayHomeAsUpEnabled() 方法实现为

getSupportActionBar().setDisplayHomeAsUpEnabled(true);  

所以你可以让它像 described here 一样工作,这是一种简单的方法