Determine if the NavigationDrawer is opening or closing

Question

Is there any way for me to determine whether the navigation drawer is opening or closing? I have read about isDrawerOpen() and isDrawerVisible() methods, but they only return true if the navigation drawer is opened or is visible respectively.

I also read about onDrawerSlide(View drawerView, float slideOffset) method which gets called when the drawer is moving. The slideOffset is the floating value between 0 and 1 telling which position the drawer is at now. But even that gets called when the drawer is opening and closing.

What I need to do is, to do something only when the drawer is opening but not when closing, something tells me that I have to use onDrawerSlide(View drawerView, float slideOffset) method, but I just can't figure out how to check if it is opening and is not closing.

Thank you

score 18 · Accepted Answer · answered Mar 23 '14 at 12:34

To track the last value is an option ...

drawerLayout.setDrawerListener(new DrawerListener() {

        private float last = 0;

        @Override
        public void onDrawerSlide(View arg0, float arg1) {

            boolean opening = arg1>last;
            boolean closing = arg1<last;

            if(opening) {
                Log.i("Drawer","opening");
            } else if(closing) {
                Log.i("Drawer","closing");
            } else {
                Log.i("Drawer","doing nothing");
            }

            last = arg1;
        }

        @Override public void onDrawerStateChanged(int arg0) {}
        @Override public void onDrawerOpened(View arg0) {}
        @Override public void onDrawerClosed(View arg0) {}

    });

score 0 · Answer 2 · answered Mar 23 '14 at 12:23

0

If You are using ActionBar ovveride ActionBarDrawerToggle

Further reading: Listen for Open and Close Events on developer.android.com

answered Mar 23 '14 at 12:23

pixel

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Code on the Rocks · Answer 3 · 2020-02-05T06:39:11.890

The setDrawerListener method is now deprecated. The new way to do this is to use the addDrawerListener method.

In Kotlin:

Initialize the DrawerLayout View

val drawerLayout: DrawerLayout = findViewById(R.id.drawer_layout)

In your main activity, create an inner class that is a subclass of DrawerLayout.DrawerListener. The DrawerLayout class implements the DrawerListener interface. You can track the changing drawer position in onDrawerSlide (Kotlin-ized version of answer above):

inner class CustomDrawer : DrawerLayout.DrawerListener{
  override fun onDrawerStateChanged(newState: Int) {
  }

var last: Float = 0f

override fun onDrawerSlide(drawerView: View, slideOffset: Float) {
    imm.hideSoftInputFromWindow(drawerView?.getWindowToken(), 0)

    var opening: Boolean = slideOffset>last
    var closing: Boolean = slideOffset<last

    if(opening) {
        Log.i("Drawer","opening")
        Log.d("Last",last.toString())
    } else if(closing) {
        Log.i("Drawer","closing")
        Log.d("Last",last.toString())
    } else {
        Log.i("Drawer","doing nothing")
        Log.d("Last",last.toString())
    }
}

override fun onDrawerClosed(drawerView: View) {

  }

override fun onDrawerOpened(drawerView: View) {

  }
}

Add your custom DrawerListener to the drawerLayout (I put it in the onCreate method)

var drawerListener = CustomDrawer() drawerLayout.addDrawerListener(drawerListener)

Determine if the NavigationDrawer is opening or closing

3 Answers3