对我来说，这两种方法都不奏效:

navigationView.getMenu .setChecked .getItem (0) () (true); navigationView.setCheckedItem (id);

试试这个，对我很管用。

onNavigationItemSelected (navigationView.getMenu () .findItem (R.id.nav_profile));

关于你的活动(在抽屉后面):

@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.addDrawerListener(toggle);
    toggle.syncState();

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);
    navigationView.setCheckedItem(R.id.nav_portfolio);
    onNavigationItemSelected(navigationView.getMenu().getItem(0));
}

and

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

    Fragment fragment = null;

    if (id == R.id.nav_test1) {
        fragment = new Test1Fragment();
        displaySelectedFragment(fragment);
    } else if (id == R.id.nav_test2) {
        fragment = new Test2Fragment();
        displaySelectedFragment(fragment);
    }

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

在菜单中:

<group android:checkableBehavior="single">

    <item
        android:id="@+id/nav_test1"
        android:title="@string/test1" />

    <item
        android:id="@+id/nav_test2"
        android:title="@string/test2" />

  </group>

第一个菜单被高亮显示为默认菜单。

出于某种原因，最好使用ID来查找MenuItem。

drawer.getMenu().findItem(R.id.action_something).setChecked(true);

API 23提供了以下方法:

navigationView.setCheckedItem(R.id.nav_item_id);

但是，由于某种原因，这个函数没有导致导航项后面的代码运行。该方法当然会突出显示导航抽屉中的项目，或“检查”它，但它似乎不会调用OnNavigationItemSelectedListener，导致启动时出现空白屏幕，如果您的启动屏幕依赖于导航抽屉的选择。可以手动调用监听器，但看起来很俗气:

if (savedInstanceState == null) this.onNavigationItemSelected(navigationView.getMenu().getItem(0));

上面的代码假设:

你已经实现了 NavigationView。OnNavigationItemSelectedListener在你的活动 您已经呼叫过: navigationView.setNavigationItemSelectedListener(这个); 您要选择的项目位于位置0

例子(NavigationView.OnNavigationItemSelectedListener):

private void setFirstItemNavigationView() {
        navigationView.setCheckedItem(R.id.custom_id);
        navigationView.getMenu().performIdentifierAction(R.id.custom_id, 0);
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setFirstItemNavigationView();
}

@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
    FragmentManager fragmentManager = getFragmentManager();

    switch (item.getItemId()) {
        case R.id.custom_id:
            Fragment frag = new CustomFragment();

            // update the main content by replacing fragments
            fragmentManager.beginTransaction()
                    .replace(R.id.viewholder_container, frag)
                    .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
                    .addToBackStack(null)
                    .commit();
            break;
    }

Tks

当使用BottomNavigationView时，其他答案如navigationView.getMenu().getItem(0).setChecked(true);和 navigationView.setCheckedItem (id);不会工作调用setSelectedItemId工作:

    BottomNavigationView bottomNavigationView = findViewById(R.id.bottom_navigation_view);

    bottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
            // TODO: 10-Aug-19 your code here 
        }
    });

    bottomNavigationView.setSelectedItemId(R.id.myitem);