Question

我使用了我在这里找到的解决方案让Action Bar上的左按钮作为Drawer Toggle，当有背板和后退按钮时没有任何东西。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。当作为后退按钮工作时，它甚至不会触发OnOptionsItemClickListener。我错过了什么？

Answer 1

您已将setDisplayHomeAsUpEnabled()方法实施为

getSupportActionBar().setDisplayHomeAsUpEnabled(true);

因此您可以将其设为described here，这是一种简单的方法

ActionBar中的抽屉/后退按钮在后面时无法点击

1 个答案: