单击导航抽屉的三个点不起作用

Question

当我试图点击三个点时它不起作用但是当我滑动它时它起作用了？单击三个点应该怎么做？我添加了我的主要 activity...

public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
    private ViewPager viewPager;
    private DrawerLayout drawer;
    public String title;

    private TabLayout tabLayout;
    private String[] pageTitle = {"First", "Second", "Third"};

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

       viewPager = (ViewPager)findViewById(R.id.view_pager);

        tabLayout = (TabLayout) findViewById(R.id.tab_layout);
        for (int i = 0; i < 3; i++) {
            tabLayout.addTab(tabLayout.newTab().setText(pageTitle[i]));
        }

        //set gravity for tab bar
        tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);

       DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawerLayout);
       ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
               this, drawer, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
       drawer.addDrawerListener(toggle);
        toggle.syncState();
        // DrawerLayout dl = (DrawerLayout)findViewById(R.id.drawerLayout);
       // ActionBarDrawerToggle t = new ActionBarDrawerToggle(this, dl,R.string.Open, R.string.Close);

       // dl.addDrawerListener(t);
       // t.syncState();

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        assert navigationView != null;
        navigationView.setNavigationItemSelectedListener(this);

        //set viewpager adapter
        ViewPagerAdapter pagerAdapter = new ViewPagerAdapter(getSupportFragmentManager());
        viewPager.setAdapter(pagerAdapter);

        //change Tab selection when swipe ViewPager
        viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));

        //change ViewPager page when tab selected
        tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                viewPager.setCurrentItem(tab.getPosition());
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {
            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {
            }
        });

        if (savedInstanceState == null) {
navigationView.getMenu().performIdentifierAction(R.id.nav_camera,0);
        }
    }

    @Override
    public void onBackPressed() {
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawerLayout);
        if (drawer.isDrawerOpen(GravityCompat.START)) {
            drawer.closeDrawer(GravityCompat.START);
        } else {
            super.onBackPressed();
        }
    }

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

        FragmentManager fm  = getSupportFragmentManager();
        switch(item.getItemId()) {
            case R.id.nav_camera:
               title="Pubg";
                viewPager.setCurrentItem(0);
                break;

            case R.id.nav_gallery:
                viewPager.setCurrentItem(1);
                break;

            case R.id.nav_slideshow:
                viewPager.setCurrentItem(2);
                break;

            case R.id.nav_manage:
                Intent intent = new Intent(MainActivity.this,NextActivity.class);
                startActivity(intent);
                break;
        }

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawerLayout);
        item.setChecked(true);
        getSupportActionBar().setTitle(title);
        assert drawer != null;
        drawer.closeDrawer(GravityCompat.START);
        return true;
    }}

以上是我的主要activity请看一下。我点了三个点navigation.please 没有用谁能解决我的问题？当我尝试单击三个点时它不起作用但是当我滑动时它起作用了？单击三个点应该怎么做？我添加了我的主要 activity。应用程序名称也没有显示我在代码中将标题作为发布但这是错误的

Answer 1

你能加上这行吗

getSupportActionBar().setHomeButtonEnabled(true)

低于

getSupportActionBar().setDisplayHomeAsUpEnabled(true)

基本上你需要 "activate" 汉堡包图标 'setHomeButtonEnabled()'

单击导航抽屉的三个点不起作用

Onclick three dots of navigation drawer not working

android

navigation-drawer