在你的activity，你需要inflate 你的menu folder

  @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            MenuInflater inflater = getMenuInflater();
            inflater.inflate(R.menu.mainmenu, menu);
            return true;
        }

之後用onNavigationItemSelected()設(shè)置點擊事件

@Override
public boolean onNavigationItemSelected(MenuItem item) {
  switch (item.getItemId()) {
  case R.id.it_timing:
    Toast.makeText(this, "timing selected", Toast.LENGTH_SHORT)
        .show();
    break;
       ......
  }   
  return true;
}

NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
        
    @SuppressWarnings("StatementWithEmptyBody")
    @Override
    public boolean onNavigationItemSelected(MenuItem item) {
        // Handle navigation view item clicks here.
        switch (item.getItemId()){
            case R.id.it_timing:
                timing();
                break;
            case R.id.nav_slideshow:

                break;
            case R.id.nav_manage:

                break;
        }
        drawer.closeDrawer(GravityCompat.START);
        return true;
    }