Android：无法将一个片段替换为另一个

Question

我需要将Fragment其中一个替换为Activity另一个Fragment，以下是的图层文件Activity：<?xml version="1.0" encoding="utf-8"?><FrameLayout  xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  android:id="@+id/home_layout_container">    <fragment android:name="com.foo.FragA"        android:id="@+id/home_list"        android:layout_width="fill_parent"        android:layout_height="fill_parent" />    </FrameLayout>所以默认情况下有FragA，现在我想在活动中将其替换为FragB，我这样做了：public void onRegionClicked(Region region) {    RegionInfoFragment rif = RegionInfoFragment.newInstance(region);    FragmentTransaction ft = getSupportFragmentManager().beginTransaction();    ft.replace(R.id.home_list, rif);}但是我有一个例外：>6:24:40.685: ERROR/AndroidRuntime(9194): Uncaught handler: thread main exiting due to uncaught exception05-06 16:24:40.692: ERROR/AndroidRuntime(9194): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.view.ViewGroup.addViewInner(ViewGroup.java:1857)05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.view.ViewGroup.addView(ViewGroup.java:1752)05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.view.ViewGroup.addView(ViewGroup.java:1709)05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.view.ViewGroup.addView(ViewGroup.java:1689)05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.support.v4.app.NoSaveStateFrameLayout.wrap(NoSaveStateFrameLayout.java:40)05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:743)05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:933)05-06 16:24:40.692: ERROR/AndroidRuntime(9194):     at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:578)我能做什么？

Answer 1

您不能替换在布局文件中静态定义的片段。您只能替换通过来动态添加的片段FragmentTransaction。

Answer 2

尝试commit()在ft结束时，需要对commit()您的更改进行通知。

Answer 3

getFragmentManger()

  .beginTransaction

  .replace(R.id.frame,Yourfragment.newInstance(),null)

  .addtobackstack

  .commit();

人们总是说我是一线客，所以这是您的一线客解决方案

Answer 4

将一个片段替换为另一个片段，并在后堆栈中保留先前的状态：

    // Create new fragment and transaction

    Fragment newFragment = new ExampleFragment();

    FragmentTransaction transaction = getFragmentManager().beginTransaction();

    // Replace whatever is in the fragment_container view with this fragment,

    // and add the transaction to the back stack

    transaction.replace(R.id.fragment_container, newFragment);

    transaction.addToBackStack(null);

    // Commit the transaction

    transaction.commit();