title: BottomNavigationView not showing in my activity
body: <p>I am implementing BottomNavigationView using this <a href="https://developer.android.com/reference/android/support/design/widget/BottomNavigationView.html" rel="noreferrer">link</a>
  i implemented everything step by step but my navigationview not showup at bottom of the screen.</p>
  
  <p>this is what i done.</p>
  
  <pre><code>public class MainActivity extends AppCompatActivity implements ActivityCompat.OnRequestPermissionsResultCallback {
  
      Intent intent = null;
      BottomNavigationView navigationView;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
  
          navigationView = (BottomNavigationView) findViewById(R.id.navigation); 
  
          navigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
              @Override
              public boolean onNavigationItemSelected(@NonNull MenuItem item) {
  
                  int id = item.getItemId();
                  if(id == R.id.program){
                      intent = new Intent(MainActivity.this, MainActivity.class);
                      startActivity(intent);
                      finish();
                  }
                  if(id == R.id.access){
                      try {
                          manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
                          if (!manager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
                              Intent myIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                              startActivity(myIntent);
                              overridePendingTransition(R.anim.push_up_in,
                                      R.anim.push_up_out);
                          } else {
                              intent = new Intent(MainActivity.this, Access.class);
                              startActivity(intent);
                              finish();
                          }
                      } catch (Exception e) {
                          e.printStackTrace();
                      }
                      return true;
                  }
                  if(id == R.id.informations){
                      intent = new Intent(MainActivity.this, Information.class);
                      startActivity(intent);
                      finish();
                      return true;
                  }
                  if(id == R.id.contact){
                      intent = new Intent(MainActivity.this, Contact.class);
                      startActivity(intent);
                      finish();
                      return true;
                  }
                  return false;
              }
          });
       }
      public boolean onCreateOptionsMenu(Menu menu) {
          super.onCreateOptionsMenu(menu);
          menu = navigationView.getMenu(); &lt;---- // --&gt;
          getMenuInflater().inflate(R.menu.menu_main, menu);
  
          return true;
      }
  }
  </code></pre>
  
  <p>and my activity.xml</p>
  
  <pre><code>&lt;android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:background="@color/colorWhite"&gt;
  
      &lt;android.support.design.widget.BottomNavigationView
          xmlns:android="http://schemas.android.com/apk/res/android"
          xmlns:design="http://schema.android.com/apk/res/android.support.design"
          android:id="@+id/navigation"
          android:layout_width="match_parent"
          android:layout_height="60dp"
          android:layout_gravity="bottom"
          design:menu="@menu/menu_main" /&gt;
  &lt;/android.support.design.widget.CoordinatorLayout&gt;
  </code></pre>
  
  <p>and i also updated gradle version to 25, otherwise it will not work.</p>
  
  <pre><code>compileSdkVersion 25
  buildToolsVersion "24.0.3"
  targetSdkVersion 25
  
  compile 'com.android.support:appcompat-v7:25.0.0'
  compile 'com.android.support:design:25.0.0'
  </code></pre>