java - 当我使用 map View 按导航项两次时，我的应用程序崩溃

Question

这是我的 onNavigationItemSelected 方法:

        }

Answer 1

这样做:

 int id = item.getItemId();
FragmentTransaction fragmentTransaction;

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

        fragment = new FragmentOne();


    } else if (id == R.id.nav_food) {
        fragment = new FragmentTwo();



    } else if (id == R.id.nav_security) {
        fragment = new FragmentThree();
     }
if (fragment != null) {
                fragmentTransaction = getSupportFragmentManager().beginTransaction();
                fragmentTransaction.replace(R.id.containerView, fragment).commit();
            }