我正在使用android studio中的导航抽屉活动模板，我创建了一个名为WelcomeFragment的片段，我的问题是，每当我尝试将WelcomeFragment添加到我的Activity时应用程序崩溃。
以下是我的Android应用程序中的代码。
NavigationDrawerActivity onCreate（）方法：
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_navigation_drawer);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
WelcomeFragment newFragment = WelcomeFragment.newInstance("testString","testString");
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.add(R.id.fragment_container, newFragment);
transaction.commit();
content_navigation_drawer.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.example.test.thisisatest.NavigationDrawerActivity"
tools:showIn="@layout/app_bar_navigation_drawer">
<!-- FRAGMENT GOES HERE -->
</FrameLayout>
app_bar_navigation_drawer.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.test.thisisatest.NavigationDrawerActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<include
android:id="@+id/content_navigation_drawer"
layout="@layout/content_navigation_drawer"
android:layout_height="wrap_content"
android:layout_width="wrap_content"/>
</android.support.design.widget.CoordinatorLayout>
activity_navigation_drawer.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<include
android:id="@+id/app_bar"
layout="@layout/app_bar_navigation_drawer"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<android.support.design.widget.NavigationView
android:id="@+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="@layout/nav_header_navigation_drawer"
app:menu="@menu/activity_navigation_drawer" />
</android.support.v4.widget.DrawerLayout>
WelcomeFragment的内容由android studio自动生成。
我已经按照here
中提到的问题的答案执行了片段以下是我的logcat中的错误
null
java.util.NoSuchElementException
at java.util.RegularEnumSet$EnumSetIterator.next(RegularEnumSet.java:102)
at java.util.RegularEnumSet$EnumSetIterator.next(RegularEnumSet.java:78)
at com.android.tools.idea.ui.resourcechooser.ChooseResourceDialog.getSelectedPanel(ChooseResourceDialog.java:500)
at com.android.tools.idea.ui.resourcechooser.ChooseResourceDialog.setupViewOptions(ChooseResourceDialog.java:836)
at com.android.tools.idea.ui.resourcechooser.ChooseResourceDialog.<init>(ChooseResourceDialog.java:338)
at com.android.tools.idea.ui.resourcechooser.ChooseResourceDialog.<init>(ChooseResourceDialog.java:117)
at com.android.tools.idea.ui.resourcechooser.ChooseResourceDialog$Builder.build(ChooseResourceDialog.java:268)
at com.android.tools.idea.uibuilder.property.editors.BrowsePanel.showResourceChooser(BrowsePanel.java:164)
at com.android.tools.idea.uibuilder.property.editors.BrowsePanel$BrowseAction.actionPerformed(BrowsePanel.java:145)
at com.intellij.openapi.actionSystem.ex.ActionUtil$1.run(ActionUtil.java:197)
at com.intellij.openapi.application.TransactionGuardImpl.runSyncTransaction(TransactionGuardImpl.java:88)
at com.intellij.openapi.application.TransactionGuardImpl.submitTransactionAndWait(TransactionGuardImpl.java:156)
at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:211)
at com.intellij.openapi.actionSystem.impl.ActionButton.actionPerformed(ActionButton.java:189)
at com.intellij.openapi.actionSystem.impl.ActionButton.performAction(ActionButton.java:155)
at com.intellij.openapi.actionSystem.impl.ActionButton.click(ActionButton.java:138)
at com.android.tools.idea.uibuilder.property.editors.BrowsePanel.mousePressed(BrowsePanel.java:118)
at com.android.tools.idea.uibuilder.property.renderer.NlAttributeRenderer.mousePressed(NlAttributeRenderer.java:124)
at com.android.tools.idea.uibuilder.property.NlFlagPropertyItem.mousePressed(NlFlagPropertyItem.java:203)
at com.android.tools.idea.uibuilder.property.ptable.PTable$MouseTableListener.mousePressed(PTable.java:529)
at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:280)
at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:279)
at java.awt.Component.processMouseEvent(Component.java:6530)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4522)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:795)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:627)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:387)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
java.util.NoSuchElementException
at java.util.RegularEnumSet$EnumSetIterator.next(RegularEnumSet.java:102)
at java.util.RegularEnumSet$EnumSetIterator.next(RegularEnumSet.java:78)
at com.android.tools.idea.ui.resourcechooser.ChooseResourceDialog.getSelectedPanel(ChooseResourceDialog.java:500)
at com.android.tools.idea.ui.resourcechooser.ChooseResourceDialog.setupViewOptions(ChooseResourceDialog.java:836)
at com.android.tools.idea.ui.resourcechooser.ChooseResourceDialog.<init>(ChooseResourceDialog.java:338)
at com.android.tools.idea.ui.resourcechooser.ChooseResourceDialog.<init>(ChooseResourceDialog.java:117)
at com.android.tools.idea.ui.resourcechooser.ChooseResourceDialog$Builder.build(ChooseResourceDialog.java:268)
at com.android.tools.idea.uibuilder.property.editors.BrowsePanel.showResourceChooser(BrowsePanel.java:164)
at com.android.tools.idea.uibuilder.property.editors.BrowsePanel$BrowseAction.actionPerformed(BrowsePanel.java:145)
at com.intellij.openapi.actionSystem.ex.ActionUtil$1.run(ActionUtil.java:197)
at com.intellij.openapi.application.TransactionGuardImpl.runSyncTransaction(TransactionGuardImpl.java:88)
at com.intellij.openapi.application.TransactionGuardImpl.submitTransactionAndWait(TransactionGuardImpl.java:156)
at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:211)
at com.intellij.openapi.actionSystem.impl.ActionButton.actionPerformed(ActionButton.java:189)
at com.intellij.openapi.actionSystem.impl.ActionButton.performAction(ActionButton.java:155)
at com.intellij.openapi.actionSystem.impl.ActionButton.click(ActionButton.java:138)
at com.android.tools.idea.uibuilder.property.editors.BrowsePanel.mousePressed(BrowsePanel.java:118)
at com.android.tools.idea.uibuilder.property.renderer.NlAttributeRenderer.mousePressed(NlAttributeRenderer.java:124)
at com.android.tools.idea.uibuilder.property.NlFlagPropertyItem.mousePressed(NlFlagPropertyItem.java:203)
at com.android.tools.idea.uibuilder.property.ptable.PTable$MouseTableListener.mousePressed(PTable.java:529)
at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:280)
at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:279)
at java.awt.Component.processMouseEvent(Component.java:6530)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4522)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:795)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:627)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:387)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)