Question

我第一次更改应用中片段的可见性时，片段显示的不是我设置的片段。

我的布局：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

<fragment
    android:id="@+id/act_main_frag_top_bar"
    class="br.com.myapp.fragments.TopBarFragment"
    android:layout_height="wrap_content"
    android:layout_width="match_parent"/>

<fragment
    android:id="@+id/act_main_frag_toolbar"
    class="br.com.myapp.fragments.ToolbarFragment"
    android:layout_height="wrap_content"
    android:layout_width="match_parent"/>

<!-- Tabs -->    
<fragment
    android:id="@+id/act_main_frag_twitter"
    class="br.com.myapp.fragments.TwitterFragment"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:visibility="gone"/>

<fragment
    android:id="@+id/act_main_frag_facebook"
    class="br.com.myapp.fragments.FacebookFragment"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:visibility="gone"/>

<fragment
    android:id="@+id/act_main_frag_tv_show"
    class="br.com.myapp.fragments.TVShowFragment"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:visibility="gone"/>

<fragment
    android:id="@+id/act_main_frag_info"
    class="br.com.bluepen.mixtv.fragments.InfoFragment"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:visibility="gone"/>

<fragment
    android:id="@+id/act_main_frag_streaming"
    class="br.com.myapp.fragments.StreamingFragment"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:visibility="gone"/>

</LinearLayout>

和myActivity：

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

    FragmentManager manager = getSupportFragmentManager();
    mStreamingFrag = (StreamingFragment) manager.findFragmentById(R.id.act_main_frag_streaming);
    mFacebookFrag = (FacebookFragment) manager.findFragmentById(R.id.act_main_frag_facebook);
    mTwitterFrag = (TwitterFragment) manager.findFragmentById(R.id.act_main_frag_twitter);
    mTVShowFrag = (TVShowFragment) manager.findFragmentById(R.id.act_main_frag_tv_show);
    mInfoFrag = (InfoFragment) manager.findFragmentById(R.id.act_main_frag_info);
    mToolbar = (ToolbarFragment) manager.findFragmentById(R.id.act_main_frag_toolbar);
    mToolbar.setListener(this);

    FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
    transaction.show(mStreamingFrag);
    transaction.commit();
}

在onCreate之后，显示的片段是TwitterFragment，而不是我在onCreate方法的最后设置中显示的StreamingFragment。

Answer 1

我发现问题，我改为隐藏onCreate中的所有片段。 Aparentelly在xml中的android：visibility =“gone”没有做到这一点。

以下是onCreate的代码：

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

    FragmentManager manager = getSupportFragmentManager();
    FragmentTransaction transaction = manager.beginTransaction();

    mStreamingFrag = (StreamingFragment) manager.findFragmentById(R.id.act_main_frag_streaming);
    transaction.show(mStreamingFrag);
    mFacebookFrag = (FacebookFragment) manager.findFragmentById(R.id.act_main_frag_facebook);
    transaction.hide(mFacebookFrag);
    mTwitterFrag = (TwitterFragment) manager.findFragmentById(R.id.act_main_frag_twitter);
    transaction.hide(mTwitterFrag);
    mTVShowFrag = (TVShowFragment) manager.findFragmentById(R.id.act_main_frag_tv_show);
    transaction.hide(mTVShowFrag);
    mInfoFrag = (InfoFragment) manager.findFragmentById(R.id.act_main_frag_info);
    transaction.hide(mInfoFrag);

    transaction.commit();
}

我不知道我是否可以将片段设置为隐藏在XML中。

Answer 2

我在2个按钮（button1和button2）上遇到了同样的问题，当我不得不隐藏第一个按钮时，第二个隐藏了，第一个没有做任何事情......我所做的一切都是CTRL + C xml和CTRL + V回来......希望它有效......

Android - 隐藏/显示片段显示错误的片段

2 个答案: