问如何检测导航抽屉是否打开？

EN

DrawerLayout mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
...
if(mDrawerLayout.isDrawerOpen(GravityCompat.START)) {
  //drawer is open
}

 mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    mDrawerToggle = new ActionBarDrawerToggle(
            this,                  /* host Activity */
            mDrawerLayout,         /* DrawerLayout object */
            R.drawable.ic_drawer,  /* nav drawer icon to replace 'Up' caret */
            R.string.drawer_open,  /* "open drawer" description */
            R.string.drawer_close  /* "close drawer" description */
            ) {

        /** Called when a drawer has settled in a completely closed state. */
        public void onDrawerClosed(View view) {
            super.onDrawerClosed(view);
            getActionBar().setTitle(mTitle);
        }

        /** Called when a drawer has settled in a completely open state. */
        public void onDrawerOpened(View drawerView) {
            super.onDrawerOpened(drawerView);
            getActionBar().setTitle(mDrawerTitle);
        }
    };

    // Set the drawer toggle as the DrawerListener
    mDrawerLayout.setDrawerListener(mDrawerToggle);

 public class YourActivity extends AppCompatActivity implements  DrawerLayout.DrawerListener {

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_dash_board);

        DrawerLayout drawer=(DrawerLayout)findViewById(R.id.container);
        drawer.setDrawerListener(this);
    }//onCreate()

    @Override
    public void onDrawerOpened(View arg0) {
      //write your code
    }

    @Override
    public void onDrawerClosed(View arg0) {
        //write your code
    }

    @Override
    public void onDrawerSlide(View arg0, float arg1) {
        //write your code
    }

    @Override
    public void onDrawerStateChanged(int arg0) {
        //write your code
    }
}//class