相关疑难解决方法(0)

我可以先将一个片段添加到视图中,然后"分离"它,然后将其"重新附加"到另一个视图中吗？

在代码中,我想:

fragOne one = new fragOne();
getSupportFragmentManager().beginTransaction()
        .add(R.id.left, one, "tag").commit();

getSupportFragmentManager().beginTransaction()
        .detach(one).commit();      // or .remove(), or .addToBackStack(null).remove()

getSupportFragmentManager().executePendingTransactions();

getSupportFragmentManager().beginTransaction()
        .add(R.id.right, one).commit();

但它会引发错误:

04-05 13:28:03.492: E/AndroidRuntime(7195): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.trybackstack/com.example.trybackstack.MainActivity}: java.lang.IllegalStateException: Can't change container ID of fragment fragOne{40523130 #0 id=0x7f080000 tag}: was 2131230720 now 2131230721

感谢帮助!

以下是我希望我的应用程序在平板电脑上执行的操作.Fragment(0)有一些菜单会显示片段(1)...(n),如下所示:

-----------------
|   |   |   |   |
|   |   |   |   |
|(0)| X | X | X |
|   |   |   |   |
|   |   |   |   |
-----------------
 becomes
-----------------
|   |   |   |   |
|   |   |   |   |
|(0)|(1)| X | X |
|   |   |   |   |
|   |   |   |   |
-----------------
 and then
-----------------
|   |   |   |   |
|   |   |   |   |
|(0)|(2)|(1)| X |
|   |   |   |   |
| …

在我的应用程序中,我有一个活动,我在运行时添加两个片段.我需要同时交换这两个片段.片段1包含一个按钮,我希望当我点击该按钮时,片段1移动到屏幕的右侧,而其他片段移动到活动的左侧.

在按钮的onClick方法我试过这样的事情

    @Override
    public void onClick(View v) {
         FragmentTransaction ft = getFragmentManager().beginTransaction();
         Fragment newFragment = getFragmentManager().findFragmentById(R.id.pageA);
         ft.remove(newFragment);
         Fragment newFragmentB = getFragmentManager().findFragmentById(R.id.pageB);
         ft.remove(newFragmentB);
         ft.add(R.id.pageB, newFragment);
         ft.add(R.id.pageA, newFragmentB);
         ft.addToBackStack(null);
         ft.commit();
     }

但我收到以下错误

 java.lang.IllegalStateException: Can't change container ID of fragment PageA{40653da0   #0 id=0x7f060001}: was 2131099649 now 2131099650

当我点击页面A上的按钮然后页面A和页面B的位置应相互交换时,我想要这样的东西.

我遇到了不同布局和设备配置更改的问题.

应用程序有3个feeds_activity布局(默认,横向和平板电脑).

默认:

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

</FrameLayout>

景观:

 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:divider="?android:dividerHorizontal"
    android:baselineAligned="false">

    <FrameLayout
        android:id="@+id/feeds_fragment_container"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="2" />

    <FrameLayout
        android:id="@+id/subnodes_fragment_container"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="4" />

</LinearLayout>

片剂:

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:divider="?android:dividerHorizontal"
    android:baselineAligned="false">

    <FrameLayout
        android:id="@+id/feeds_fragment_container"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="2" />

    <FrameLayout
        android:id="@+id/subnodes_fragment_container"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="4" />

</LinearLayout>

这是一个onCreate方法的活动:

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



        if (findViewById(R.id.subnodes_fragment_container) != null) {

            SubNodesFragment subNodesFragment = (SubNodesFragment) getSupportFragmentManager()
                    .findFragmentByTag(getString(R.string.subnodes_fragment_tag)); …