以编程方式更改MenuItem Navigation Drawer Android的图标？

您好我在我的应用程序中创建导航抽屉.现在我有问题如何以编程方式更改MenuItem导航抽屉的每个图标？如果在Xml中菜单如下:

和这样的活动:

public class MainActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.setDrawerListener(toggle);
        toggle.syncState();

        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setIc
        navigationView.setNavigationItemSelectedListener(this);
        setFragmentArtikel();
    }

    @SuppressWarnings("StatementWithEmptyBody")
    @Override
    public boolean onNavigationItemSelected(MenuItem item) {
        // Handle navigation view item clicks here.
        int id = item.getItemId();

        if (id == R.id.nav_input_berita) {

        } else if (id == R.id.nav_logout) {

        }
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
        return true;
    }

}

所以如何编程.改变图标android:icon="@drawable/ic_nav_input_berita"和android:icon="@drawable/ic_nav_input_logout"？对不起我的英语不好

这样做:

NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
Menu menu = navigationView.getMenu();
MenuItem nav_input_beritaItem = menu.findItem(R.id.nav_input_berita);
nav_input_beritaItem .setIcon(R.drawable.ic_nav_input_berita);
MenuItem nav_logoutItem = menu.findItem(R.id.nav_input_logout);
nav_logoutItem .setIcon(R.drawable.ic_nav_input_logout);

就这样