Question

我有一个导航抽屉，可在多个活动之间切换。在每个活动中，我有一个可能启动其他片段的基本片段。我希望导航抽屉切换图标显示我在基本片段中的时间，但是当我添加另一个片段时，我需要显示后退箭头。

我一直在关注riwnodennyk列出的例子： Switching between Android Navigation Drawer image and Up caret when using fragments

但它不适合我。箭头确实显示但我无法点击它。点击它没有任何反应。

非基本片段中的OptionsMenuListner：

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


    return false;
}

我调用setHasOptionsMenu（true）;在片段中。

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

以下方法适用于我。

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，它将显示一个后退箭头并作为Back Press工作，并在其中传递false将显示导航抽屉图标并打开导航抽屉。

Answer 2

我遇到了同样的问题。我不确定，为什么我们没有收到onOptionsItemSelected的电话，但我创建了一个解决方法。

我修改了抽屉布局。您现在可以添加一个监听器，每次按下切换按钮时都不会使用该监听器。

您可以阻止切换按钮的操作，或让它继续。

这是班级：的 ListenableDrawerLayout.java

public class ListenableDrawerLayout extends DrawerLayout { private OnToggleButtonClickedListener mOnToggleButtonClickedListener; private boolean mManualCall; public ListenableDrawerLayout(Context context) { super(context); } public ListenableDrawerLayout(Context context, AttributeSet attrs) { super(context, attrs); } public ListenableDrawerLayout(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } /** * Sets the listener for the toggle button * * @param mOnToggleButtonClickedListener */ public void setOnToggleButtonClickedListener(OnToggleButtonClickedListener mOnToggleButtonClickedListener) { this.mOnToggleButtonClickedListener = mOnToggleButtonClickedListener; } /** * Opens the navigation drawer manually from code * NOTE: Use this function instead of the normal openDrawer method * * @param drawerView */ public void openDrawerManual(View drawerView) { mManualCall = true; openDrawer(drawerView); } /** * Closes the navigation drawer manually from code * NOTE: Use this function instead of the normal closeDrawer method * * @param drawerView */ public void closeDrawerManual(View drawerView) { mManualCall = true; closeDrawer(drawerView); } @Override public void openDrawer(View drawerView) { // Check for listener and for not manual open if (!mManualCall && mOnToggleButtonClickedListener != null) { // Notify the listener and behave on its reaction if (mOnToggleButtonClickedListener.toggleOpenDrawer()) { return; } } // Manual call done mManualCall = false; // Let the drawer layout to its stuff super.openDrawer(drawerView); } @Override public void closeDrawer(View drawerView) { // Check for listener and for not manual close if (!mManualCall && mOnToggleButtonClickedListener != null) { // Notify the listener and behave on its reaction if (mOnToggleButtonClickedListener.toggleCloseDrawer()) { return; } } // Manual call done mManualCall = false; // Let the drawer layout to its stuff super.closeDrawer(drawerView); } /** * Interface for toggle button callbacks */ public static interface OnToggleButtonClickedListener { /** * The ActionBarDrawerToggle has been pressed in order to open the drawer * * @return true if we want to consume the event, false if we want the normal behaviour */ public boolean toggleOpenDrawer(); /** * The ActionBarDrawerToggle has been pressed in order to close the drawer * * @return true if we want to consume the event, false if we want the normal behaviour */ public boolean toggleCloseDrawer(); }

}

让我们看一下用法：

mDrawerLayout.setOnToggleButtonClickedListener(new ListenableDrawerLayout.OnToggleButtonClickedListener() { @Override public boolean toggleOpenDrawer() { // Check if we want to navigate back if (...want back...) { // -> Do back navigation getActivity().onBackPressed(); // return true to prevent drawer from opening return true; } return false; } @Override public boolean toggleCloseDrawer() { // Return always false to allow closing everytime return false; } });

重要提示：如果您从代码中手动打开/关闭，请使用新方法 openDrawerManual和closeDrawerManual

带后箭头的Android导航抽屉

2 个答案: