我有一个非常基本的片段，似乎正在引起我一些问题，但我不知道为什么。当膨胀我的布局中的片段时，它抛出InflateException。
HabitListActivity
package com.tertiushand.habitthat;
import android.graphics.Outline;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewOutlineProvider;
import android.widget.ImageButton;
public class HabitListActivity extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_habit_list);
//Create FAB button
ImageButton fab = (ImageButton) findViewById(R.id.fab);
ViewOutlineProvider viewOutlineProvider = new ViewOutlineProvider() {
@Override
public void getOutline(View view, Outline outline) {
// Or read size directly from the view's width/height
int size = getResources().getDimensionPixelSize(R.dimen.fab_size);
outline.setOval(0, 0, size, size);
}
};
fab.setOutlineProvider(viewOutlineProvider);
//End FAB button
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_habit_list, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
activity_habit_list.xml
<FrameLayout 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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".HabitListActivity">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView android:text="@string/hello_world" android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<fragment
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:name="com.tertiushand.habitthat.TodoFragment"
android:id="@+id/todofragment"
tools:layout="@layout/fragment_todo_layout" />
</LinearLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageButton
android:id="@+id/fab"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_width="@dimen/fab_size"
android:layout_height="@dimen/fab_size"
android:layout_gravity="bottom|end"
android:layout_marginEnd="15dp"
android:layout_marginBottom="15dp"
android:background="@drawable/ripple"
android:stateListAnimator="@anim/anim"
android:src="@drawable/ic_action_add"
android:elevation="4dp"
android:contentDescription="@string/habit_button_desc"
android:baselineAlignBottom="false" />
</RelativeLayout>
</FrameLayout>
ToDoFragment.java
package com.tertiushand.habitthat;
import android.app.Activity;
import android.os.Bundle;
import android.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.ListAdapter;
import android.widget.TextView;
import com.tertiushand.habitthat.dummy.DummyContent;
/**
* A fragment representing a list of Items.
* <p/>
* Large screen devices (such as tablets) are supported by replacing the ListView
* with a GridView.
* <p/>
* Activities containing this fragment MUST implement the {@link OnFragmentInteractionListener}
* interface.
*/
public class TodoFragment extends Fragment implements AbsListView.OnItemClickListener {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private OnFragmentInteractionListener mListener;
/**
* The fragment's ListView/GridView.
*/
private AbsListView mListView;
/**
* The Adapter which will be used to populate the ListView/GridView with
* Views.
*/
private ListAdapter mAdapter;
private CheckBox doneCheckBox;
// TODO: Rename and change types of parameters
public static TodoFragment newInstance(String param1, String param2) {
TodoFragment fragment = new TodoFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
/**
* Mandatory empty constructor for the fragment manager to instantiate the
* fragment (e.g. upon screen orientation changes).
*/
public TodoFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
// TODO: Change Adapter to display your content
//mAdapter = new ArrayAdapter<DummyContent.DummyItem>(getActivity(),
// android.R.layout.simple_list_item_1, android.R.id.text1, DummyContent.ITEMS);
//doneCheckBox = new CheckBox(getActivity());
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_todo_card, container, false);
// Set the adapter
mListView = (AbsListView) view.findViewById(android.R.id.list);
((AdapterView<ListAdapter>) mListView).setAdapter(mAdapter);
// Set OnItemClickListener so we can be notified on item clicks
mListView.setOnItemClickListener(this);
return view;
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mListener = (OnFragmentInteractionListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (null != mListener) {
// Notify the active callbacks interface (the activity, if the
// fragment is attached to one) that an item has been selected.
mListener.onFragmentInteraction(DummyContent.ITEMS.get(position).id);
}
}
/**
* The default content for this Fragment has a TextView that is shown when
* the list is empty. If you would like to change the text, call this method
* to supply the text it should use.
*/
public void setEmptyText(CharSequence emptyText) {
View emptyView = mListView.getEmptyView();
if (emptyView instanceof TextView) {
((TextView) emptyView).setText(emptyText);
}
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p/>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
public void onFragmentInteraction(String id);
}
}
fragment_todo_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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" tools:context="com.tertiushand.habitthat.TodoFragment">
<ListView android:id="@android:id/list" android:layout_width="match_parent"
android:layout_height="match_parent" />
<TextView android:id="@android:id/empty" android:layout_width="match_parent"
android:layout_height="match_parent" android:gravity="center" />
</FrameLayout>
这是异常堆栈：
05-10 06:59:34.876 20657-20657/? E/AndroidRuntime﹕ FATAL EXCEPTION: main Process: com.tertiushand.habitthat, PID: 20657 java.lang.RuntimeException: Unable to start activity >ComponentInfo{com.tertiushand.habitthat/com.tertiushand.habitthat.HabitListActi>vity}: android.view.InflateException: Binary XML file line #16: Error inflating >class fragment
at >android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at >android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at >android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at >com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: android.view.InflateException: Binary XML file line #39: Error >inflating class fragment
at >android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:763)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
at >com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:37>8)
at android.app.Activity.setContentView(Activity.java:2145)
at >com.tertiushand.habitthat.HabitListActivity.onCreate(HabitListActivity.java:18)
at android.app.Activity.performCreate(Activity.java:5990)
at >android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at >android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at >android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at >android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at >com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.ClassCastException: >com.tertiushand.habitthat.HabitListActivity@5d5cc94 must implement >OnFragmentInteractionListener
at >com.tertiushand.habitthat.TodoFragment.onAttach(TodoFragment.java:106)
at >android.app.FragmentManagerImpl.moveToState(FragmentManager.java:853)
at >android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1045)
at >android.app.FragmentManagerImpl.addFragment(FragmentManager.java:1147)
at >android.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2116)
at android.app.Activity.onCreateView(Activity.java:5328)
at >android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:733)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
at >com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:37>8)
at android.app.Activity.setContentView(Activity.java:2145)
at >com.tertiushand.habitthat.HabitListActivity.onCreate(HabitListActivity.java:18)
at android.app.Activity.performCreate(Activity.java:5990)
at >android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at >android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at >android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at >android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
最佳答案
在TodoFragment中，您要将自己的Activity HabitListActivity强制转换为OnFragmentInteractionListener，但是HabitListActivity没有实现OnFragmentInteractionListener，这会导致InflateException。更改
public class HabitListActivity extends FragmentActivity {
至
public class HabitListActivity extends FragmentActivity implements OnFragmentInteractionListener {
实现
OnFragmentInteractionListener接口的方法，然后再次运行