关联菜单NavigationView

  @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.bottm_nav, menu);
        return true;
    }
    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        switch (item.getItemId()) {
            case R.id.navigation_home:
                Toast.makeText(MainActivity.this, "Home", Toast.LENGTH_LONG).show();
                webView.loadUrl("http://47.98.153.82/test.html");
                break;
            case R.id.navigation_dashboard:
                webView.loadUrl("https://www.baidu.com");
                break;
            default:
                break;
        }
        return true;
    }