切换并点击导航抽屉内的碎片

Question

我在Android Studio中创建了导航抽屉。

现在从抽屉中的每个片段都无处可去。

我需要知道我怎么能片段之间切换，点击每一个

我知道我需要作出新的片段，而是用了什么方法，所以我可以从抽屉式导航栏上的设置点击所以导致我要碎片分享？

这是我的代码;

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); 

     FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
     fab.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) 
         .setAction("Action", null).show(); 
      } 
     }); 

     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.setNavigationItemSelectedListener(this); 
    } 

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

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 

     //noinspection SimplifiableIfStatement 
     if (id == R.id.action_settings) { 
      return true; 
     } 

     return super.onOptionsItemSelected(item); 
    } 

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

     if (id == R.id.nav_camera) { 
      // Handle the camera action 
     } else if (id == R.id.nav_gallery) { 

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

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

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

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

     } 

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

Answer 1

您处于正确的方向。只需添加类片段在每个导航项目的像下面

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

    Fragment fragment = null; 
    FragmentManager fragmentManager = getSupportFragmentManager(); 

    if (id == R.id.nav_camera) { 
     // Handle the camera action 
     fragment = new DefaultFragment(); 
     fragmentManager.beginTransaction().replace(R.id.first_container, fragment).commit(); 

    } else if (id == R.id.nav_gallery) { 
     fragment = new ItemListFragment(); 
     fragmentManager.beginTransaction().replace(R.id.first_container, fragment).commit(); 

    } 
} 

在onCreate(Bundle savedInstanceState)方法的末尾，你可以设置默认片段上的活动负载打开。

FragmentManager fragmentManager = getSupportFragmentManager(); 
    DefaultFragment fragment = new DefaultFragment(); 
    fragmentManager.beginTransaction().replace(R.id.first_container, fragment).commit(); 

Answer 2

public boolean onNavigationItemSelected(MenuItem item) { 
     // Handle navigation view item clicks here.`enter code here` 
     int id = item.getItemId(); 
     FragmentManager fragmentManager =getSupportFragmentManager(); 
     GoogleMap googleMap =getSupportFragmentManager(); 

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

     } else if (id == R.id.map) { 
      fragmentManager.beginTransaction().replace(R.id.contenedor,new mapposta()).commit(); 
     } else if (id == R.id.parametre) { 

     } 

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