Wie wird eine Navigationsleiste in mehreren Aktivitäten angezeigt?

Question

BaseActivity.java

public class BaseActivity extends AppCompatActivity 
    implements NavigationView.OnNavigationItemSelectedListener { 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_base); 
    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.base, 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; 
} 
} 

Ich versuche, meine BaseActivity in meinem MainActivity erscheinen zu lassen. Aber ich bin nicht in der Lage, es zu tun .... Ich habe versucht, die BaseActivity vom MainActivity zu verlängern, aber immer noch nicht funktioniert hat ...

MainActivity.java

public class MainActivity extends BaseActivity { 

private static final String TAG = "MainActivity"; 
private SectionsPageAdapter mSectionsPageAdapter; 
private ViewPager mViewPager; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    Log.d(TAG, "onCreate: Starting."); 

    mSectionsPageAdapter = new SectionsPageAdapter(getSupportFragmentManager()); 

    // Set up the ViewPager with the sections adapter. 
    mViewPager = (ViewPager) findViewById(R.id.container); 
    setupViewPager(mViewPager); 

    TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs); 
    tabLayout.setupWithViewPager(mViewPager); 
} 

private void setupViewPager(ViewPager viewPager) { 
    SectionsPageAdapter adapter = new SectionsPageAdapter(getSupportFragmentManager()); 
    adapter.addFragment(new Tab1Fragment(), "STATUS"); 
    adapter.addFragment(new Tab2Fragment(), "CHATS"); 
    //adapter.addFragment(new Tab3Fragment(), "CONTACTS"); 
    viewPager.setAdapter(adapter); 
} 

} 

Was soll ich tun damit es funktioniert?

Die App wird erfolgreich geöffnet, zeigt aber nicht die Navigationsleiste ... Bitte helfen Sie !!!

Answer 1

Die Verwendung derselben NavigationDrawer-Java-Objekte ist nicht möglich. Sie müssen die Schublade in der Layoutdatei und im Java-Code für jede Aktivität erneut einrichten.