drawer_open.java

/**
* As we use app compat it seems Solo#setNavigationDrawer is not doing well (drawer does not open, but the button is clicked)
* Same result for clickOnView(getView(android.R.id.home))
* 
* This code opens the navigation drawer on the main thread
* Be aware : you need to provide your DrawerLayout id (you can do it in params)
*/
public void openCompatNavigationDrawer() {
    getInstrumentation().runOnMainSync(new Runnable() {
        @Override
        public void run() {
            // You need to replace with your DrawerLayout id, or set it in params
            ((DrawerLayout) mSolo.getView(R.id.drawer_layout)).openDrawer(Gravity.LEFT);
        }
    });
}