Question

下面是我的代码，这些片段彼此重叠。当我第一次使用该应用程序时，片段可以正常工作。突然之间，它们彼此重叠。然后，如果我关闭该应用程序，然后再次打开，则它恢复正常

final Fragment fragment1 = new HomeFragment();
final Fragment fragment2 = new NotificationsFragment();
final Fragment fragment3 = new ProfileFragment();
final FragmentManager fm = getSupportFragmentManager();
Fragment active = fragment1;

SessionManager session;


private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
        = new BottomNavigationView.OnNavigationItemSelectedListener() {

    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
        switch (item.getItemId()) {
            case R.id.navigation_home:
                //mTextMessage.setText(R.string.title_home);

                fm.beginTransaction().hide(active).show(fragment1).commit();
                active = fragment1;
                return true;
            case R.id.navigation_notifications:
                //mTextMessage.setText(R.string.title_notifications);
                fm.beginTransaction().hide(active).show(fragment2).commit();
                active = fragment2;
                return true;
            case R.id.navigation_profile:
                //mTextMessage.setText(R.string.title_profile);
                fm.beginTransaction().hide(active).show(fragment3).commit();
                active = fragment3;
                return true;
        }
        return false;
    }
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_dash_board);

    // Session class instance
    session = new SessionManager(getApplicationContext());




    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    //mTextMessage = (TextView) findViewById(R.id.message);
    BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
    navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);

    fm.beginTransaction().add(R.id.main_container, fragment3, "3").hide(fragment3).commit();
    fm.beginTransaction().add(R.id.main_container, fragment2, "2").hide(fragment2).commit();
    fm.beginTransaction().add(R.id.main_container,fragment1, "1").commit();

}

碎片相互包裹

1 个答案: