我正在尝试使用add(R.id.containerId, fragment);从活动中添加片段。但是，日志会显示java.lang.IllegalArgumentException: No view found for id错误。
片段布局在根元素中包含id。我知道将容器id放在子元素中应该可以解决问题，但这对我没有任何影响。
以下是片段布局xml文件中的根元素：
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#f2f2f2"
android:orientation="vertical"
tools:context=".view.fragment.Fragment">
以下是我的活动中的 onCreate（）方法：
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.add(R.id.fragment_container, fragment);
currentFragment = R.id.fragment_container;
transaction.commit();
以下是片段中的 onCreateView（）方法：
return inflater.inflate(R.layout.fragment, container, false);
以下是整个活动代码（命名和ID不同，因为我在上面的代码段中更改了它们，为简洁起见，还缺少rails语句）：
public class MainActivity extends AppCompatActivity {
private int currentFragmentId;
private FeedFragment feedFragment = new FeedFragment();
private EventsFragment eventsFragment = new EventsFragment();
private SearchFragment searchFragment = new SearchFragment();
private MoreFragment moreFragment = new MoreFragment();
// Add other fragments
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.main_toolbar);
setSupportActionBar(toolbar);
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.add(R.id.fragment_feed_container, feedFragment);
currentFragmentId = R.id.fragment_feed_container;
transaction.commit();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.main_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_feed:
// Add the feed fragment
replaceFragment(feedFragment, currentFragmentId);
currentFragmentId = R.id.fragment_feed_container;
return true;
case R.id.action_events:
// Add the events fragment
replaceFragment(eventsFragment, currentFragmentId);
currentFragmentId = R.id.fragment_events_container;
return true;
case R.id.action_search:
// Add the search fragment
replaceFragment(searchFragment, currentFragmentId);
currentFragmentId = R.id.fragment_search_container;
return true;
case R.id.action_more:
// Add the more fragment
replaceFragment(moreFragment, currentFragmentId);
currentFragmentId = R.id.fragment_more_container;
return true;
default:
// If we got here, the user's action was not recognized.
// Invoke the superclass to handle it.
return super.onOptionsItemSelected(item);
}
}
/**
* Replaces the current fragment with a new fragment
*
* @param newFragment
* @param currentFragmentId
*/
private void replaceFragment(Fragment newFragment, int currentFragmentId) {
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(currentFragmentId, newFragment);
transaction.commit();
}
}
以下是完整片段类（命名和ID不同，因为我在上面的片段中更改了它们，为简洁起见，也缺少imports语句）：
public class FeedFragment extends Fragment {
public View mView;
public FeedFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
mView = inflater.inflate(R.layout.fragment_feed, container, false);
return mView;
}
}
以下是完整fragment_feed.xml 文件的代码（命名和ID不同，因为我在上面的代码段中更改了它们，为简洁起见，也缺少imports语句）：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/fragment_feed_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#f2f2f2"
android:orientation="vertical"
tools:context=".view.fragment.FeedFragment">
<!-- A CardView that contains a TextView -->
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/card_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="15dp"
card_view:cardBackgroundColor="#fff"
card_view:cardCornerRadius="0dp"
card_view:cardElevation="3dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="@+id/top_card_linear_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="12dp"
android:layout_marginRight="12dp"
android:layout_marginTop="6dp"
android:orientation="horizontal">
<ImageView
android:id="@+id/card_profile_image_view"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="start" />
<TextView
android:id="@+id/card_info_text"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="6"
android:gravity="start"
tools:text="Julien Durrand invited you" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="end"
tools:text="3 months" />
</LinearLayout>
<ImageView
android:id="@+id/card_main_image_view"
android:layout_width="match_parent"
android:layout_height="150dp"
android:layout_below="@+id/top_card_linear_layout"
android:layout_marginLeft="12dp"
android:layout_marginRight="12dp"
android:layout_marginTop="12dp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/card_main_image_view"
android:layout_marginLeft="12dp"
android:layout_marginRight="12dp"
android:layout_marginTop="6dp"
android:orientation="horizontal">
<ImageView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="start" />
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="2"
android:gravity="start"
tools:text="30K" />
<ImageButton
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="2"
android:gravity="center" />
<ImageButton
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="2"
android:gravity="center" />
<ImageButton
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="2"
android:gravity="center" />
</LinearLayout>
</RelativeLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
以下是logcat堆栈跟踪的主要部分（命名和ID不同，因为我在上面的代码段中更改了它们，为简洁起见，还缺少import语句）：
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.tomfinet.magpie/com.tomfinet.magpie.view.MainActivity}: java.lang.IllegalArgumentException: No view found for id 0x7f0c0076 (com.tomfinet.magpie:id/fragment_feed_container) for fragment FeedFragment{c9899d7 #0 id=0x7f0c0076}
Caused by: java.lang.IllegalArgumentException: No view found for id 0x7f0c0076 (com.tomfinet.magpie:id/fragment_feed_container) for fragment FeedFragment{c9899d7 #0 id=0x7f0c0076}
我检查过的东西：
如何解决此错误？
谢谢。