androidnavigation-drawerdrawerlayoutdrawertoggle

How to detect that the DrawerLayout started opening?


So I have tabs that I want to hide when the Navigation Drawer starts opening. The code I have hides them when it finished opening, but it's not what I want.

mDrawerToggle = new ActionBarDrawerToggle(
        this,                 
        mDrawerLayout,        
        R.drawable.ic_drawer,  
        R.string.drawer_open,  
        R.string.drawer_close  
) {
    @Override
    public void onDrawerClosed(View view) {
        invalidateOptionsMenu(); 
        setActionBarMode(ActionBar.NAVIGATION_MODE_TABS);
    }

    @Override
    public void onDrawerOpened(View drawerView) {
        invalidateOptionsMenu(); 
        setActionBarMode(ActionBar.NAVIGATION_MODE_STANDARD);
    }

};
mDrawerLayout.setDrawerListener(mDrawerToggle);

Here's what I tried:


Solution

  • DEPRECATED: See other answers for a more suitable solution

    There are 2 possible ways to do that:

    1. Use onDrawerSlide(View drawerView, float slideOffset) callback

    slideOffset changes from 0 to 1. 1 means it is completely open, 0 - closed.

    Once offset changes from 0 to !0 - it means it started opening process. Something like:

    mDrawerToggle = new ActionBarDrawerToggle(
            this,                 
            mDrawerLayout,        
            R.drawable.ic_drawer,  
            R.string.drawer_open,  
            R.string.drawer_close  
    ) {
    
        @Override
        public void onDrawerSlide(View drawerView, float slideOffset) {
            if (slideOffset == 0
                    && getActionBar().getNavigationMode() == ActionBar.NAVIGATION_MODE_STANDARD) {
                // drawer closed
                getActionBar()
                        .setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
                invalidateOptionsMenu();
            } else if (slideOffset != 0
                    && getActionBar().getNavigationMode() == ActionBar.NAVIGATION_MODE_TABS) {
                // started opening
                getActionBar()
                        .setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
                invalidateOptionsMenu();
            }
            super.onDrawerSlide(drawerView, slideOffset);
        }
    };
    mDrawerLayout.setDrawerListener(mDrawerToggle);
    
    1. Use onDrawerStateChanged(int newState) callback

    You need to listen to STATE_SETTLING states - this state is reported whenever drawer starts moving (either opens or closes). So once you see this state - check whether drawer is opened now and act accordingly:

    mDrawerToggle = new ActionBarDrawerToggle(
            this,                 
            mDrawerLayout,        
            R.drawable.ic_drawer,  
            R.string.drawer_open,  
            R.string.drawer_close  
    ) {
        @Override
        public void onDrawerStateChanged(int newState) {
            if (newState == DrawerLayout.STATE_SETTLING) {
                if (!isDrawerOpen()) {
                    // starts opening
                    getActionBar()
                            .setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
                } else {
                    // closing drawer
                    getActionBar()
                            .setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
                }
                invalidateOptionsMenu();
            }
        }
    };
    mDrawerLayout.setDrawerListener(mDrawerToggle);