小编ada*_*ion的帖子

我是android开发的新手.我希望在用户未登录时隐藏导航抽屉.所以基本上,它会显示登录片段(更好的全屏幕像Facebook android).如果用户已登录,将始终显示导航抽屉.

MainActivity.java

public class MainActivity extends AppCompatActivity {

private DrawerLayout navDrawerLayout;
private Toolbar toolbar;
private ActionBarDrawerToggle navDrawerToggle;

private SharedPreferences pref;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    navDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);

    // Find our drawer view
    NavigationView navDrawerView = (NavigationView) findViewById(R.id.navdrawer_view);
    // Setup drawer view
    setupDrawerContent(navDrawerView);

    navDrawerToggle = setupDrawerToggle();

    pref = getPreferences(0);
    initFirstFrame();
}

private ActionBarDrawerToggle setupDrawerToggle() {
    return new ActionBarDrawerToggle(this, navDrawerLayout, toolbar, R.string.drawer_open,  R.string.drawer_close);
}

private void setupDrawerContent(NavigationView navDrawerView) {
    navDrawerView.setNavigationItemSelectedListener(
            new …