带背箭头的Android导航抽屉

Question

我有一个在几个活动之间过渡的导航抽屉。在每个活动中，我都有一个基础片段，它可能启动其他片段。我希望导航抽屉切换图标显示时，我在基础片段，但当我添加另一个片段，我需要显示后箭头。

我一直在遵循riwnodennyk在的示例：使用片段时在Android导航抽屉图像和上插入符号之间切换

但这对我不起作用。箭头确实会出现，但我无法单击它。当点击它时，什么也不会发生。

非碱基片段中的OptionsMenuListner：

    @Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Get item selected and deal with it
    Log.d("HERE", "HERHEHREHREHddddddREe");


    return false;
}

我确实调用setHasOptionsMenu（真）；在碎片里。

导航片段的相关部分：

 public void setup(int fragmentId, DrawerLayout drawerLayout, Toolbar toolbar) {
    mFragmentContainerView = getActivity().findViewById(fragmentId);
    mDrawerLayout = drawerLayout;


    mActionBarDrawerToggle = new ActionBarDrawerToggle(getActivity(), mDrawerLayout, toolbar, R.string.drawer_open, R.string.drawer_close) {
        @Override
        public void onDrawerClosed(View drawerView) {
            super.onDrawerClosed(drawerView);
            setActionBarArrowDependingOnFragmentsBackStack();

            if (!isAdded()) return;
            getActivity().invalidateOptionsMenu();

            if (mCallbacks != null && nextSelectedPosition != mCurrentSelectedPosition) {
                mCurrentSelectedPosition = nextSelectedPosition;
                mCallbacks.onNavigationDrawerItemSelected(nextSelectedPosition);
            }
        }

        @Override
        public void onDrawerOpened(View drawerView) {
            super.onDrawerOpened(drawerView);
            setDrawerIndicatorEnabled(true);
            if (!isAdded()) return;

            getActivity().invalidateOptionsMenu();
        }
    };

    mActionBarDrawerToggle.setHomeAsUpIndicator(R.drawable.appbar_back);


    mDrawerLayout.post(new Runnable() {
        @Override
        public void run() {
            mActionBarDrawerToggle.syncState();
        }
    });

    mDrawerLayout.setDrawerListener(mActionBarDrawerToggle);
    ((BaseNavigationActivity)getActivity()).getSupportFragmentManager().addOnBackStackChangedListener(mOnBackStackChangedListener);
}

private FragmentManager.OnBackStackChangedListener
        mOnBackStackChangedListener = new FragmentManager.OnBackStackChangedListener() {
    @Override
    public void onBackStackChanged() {
        Log.d("TAG", "Back stack was called");
        setActionBarArrowDependingOnFragmentsBackStack();
    }
};

private void setActionBarArrowDependingOnFragmentsBackStack() {
    int backStackEntryCount =
            ((BaseNavigationActivity)getActivity()).getSupportFragmentManager().getBackStackEntryCount();
    Log.d("TEST", "Back Stack Count: " + backStackEntryCount);
    mActionBarDrawerToggle.setDrawerIndicatorEnabled(backStackEntryCount == 0);
}

Answer 1

下面的方法对我有效。

private boolean mToolBarNavigationListenerIsRegistered = false;

public void enableButton(boolean enable) {
    if (enable) {
        mDrawableToggle.setDrawerIndicatorEnabled(false);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        if (!mToolBarNavigationListenerIsRegistered) {
            mDrawableToggle.setToolbarNavigationClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    onBackPressed();
                }
            });

            mToolBarNavigationListenerIsRegistered = true;
        }

    } else {
        getSupportActionBar().setDisplayHomeAsUpEnabled(false);
        mDrawableToggle.setDrawerIndicatorEnabled(true);
        mDrawableToggle.setToolbarNavigationClickListener(null);
        mToolBarNavigationListenerIsRegistered = false;
    }
}here

在调用此方法时，如果您将true作为参数传递，它将显示一个向后箭头，并作为一个向后按，通过在其中传递false，它将显示导航抽屉图标并打开导航抽屉。