android - FragmentTransaction 替换不工作

Question

我已经在 stackoverflow 上搜索过这个问题并找到了这两个解决方案:

Replacing a fragment with another fragment inside activity group
Fragment add or replace not working

但是我的代码似乎是正确的，您可以在下面查看，我的代码上的注释是葡萄牙语(巴西):

这是我的类 MenuItemReceiver(是的，我使用 BroadcastReceiver 来显示我的 fragment )，这已经可以显示我的 fragment 内容但是当我尝试替换它时，旧 fragment 保留下来，新 fragment 出现在旧 fragment 之上一个。

    public void onReceive(Context context, Intent intent) {
        //Fragment que será carregado, este fragment foi repassado pelo SlideMenuAdapter ao ter um item clicado
        Serializable serializableExtra = intent.getSerializableExtra(CustomFragment.CUSTOM_FRAGMENT);
        //Cast para CustomFragment uma vez que devemos recupera-lo como Serializable, poderia ter dado cast direto, mas decidi manter assim para melhor entendimento do código
        CustomFragment fragment =  (CustomFragment) serializableExtra;
        FragmentTransaction ft = slideMenuActivity.getSupportFragmentManager().beginTransaction();//Informa que estamos inicando uma transação nova
        ft.replace(R.id.dashboard,fragment);
        ft.addToBackStack(null);
        ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
        ft.commit();
        //Aplicamos as alterações permitindo que o estado do fragment seja perdido posteriormente, utilizamos o StateLoss para otimizar 
        //o gerenciamento de memória e garantir que nenhum fragment fique para traz porem sem possibilitado de ser "revisitado"
        slideMenuActivity.toggle();//Aqui simplesmente estamos escondendo o menu
    }

我也试过这段代码，没有什么区别:

    public void onReceive(Context context, Intent intent) {
        Serializable serializableExtra = intent.getSerializableExtra(CustomFragment.CUSTOM_FRAGMENT);
        CustomFragment fragment =  (CustomFragment) serializableExtra;
        Fragment oldFragment = slideMenuActivity.getSupportFragmentManager().findFragmentById(R.id.dashboard);
        FragmentTransaction ft;
        if(oldFragment!=null){
            ft = slideMenuActivity.getSupportFragmentManager().beginTransaction();
            ft.remove(oldFragment);
            ft.commit();
        }
        ft = slideMenuActivity.getSupportFragmentManager().beginTransaction();ft.add(R.id.dashboard,fragment);
        ft.addToBackStack(null);
        ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
        ft.commit();
        slideMenuActivity.toggle();
    }

在这里您可以看到我的仪表板布局:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/dashboard"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white" >

</FrameLayout>

Answer 1

请注意 fragmentTransaction.replace 是(在撰写本文时)错误 - 参见 https://code.google.com/p/android/issues/detail?id=24674 .

你现在可以做的是

• 为问题加注星标(在提供的链接中)和
• 在 Google 修复它之前想出一个解决方法。

我的解决方法是手动删除所有相关 fragment (在 fragmentManager.getFragments() 的帮助下)并使用 fragmentTransaction 通常添加新 fragment 。添加。