我尝试用里面的ListView构建一个Fragment。在活动开始时，应用程序崩溃并发生InflaterException。
我有一个自定义适配器，它应该将自定义行设计扩展到ListView中。你能帮我吗？
messagelistrow.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/messageListRow"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@drawable/border"
android:padding="6dp" >
<ImageView
android:id="@+id/icon"
android:layout_width="50dip"
android:layout_height="50dip"
android:src="@drawable/ic_action_mail_blue"
android:layout_alignParentLeft="true"
android:layout_centerInParent="true"
android:scaleType="center"
android:contentDescription="@string/messageImageDescription"/>
<TextView
android:id="@+id/messageDate"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_toRightOf="@id/icon"
android:ellipsize="marquee"
android:singleLine="true"
android:textColor="#1e1e1e"
android:textSize="@dimen/contentTextSize" />
<TextView
android:id="@+id/messageSnippet"
android:textAppearance="?android:attr/textAppearanceLarge"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_toRightOf="@+id/icon"
android:layout_marginLeft="2dip" />
</RelativeLayout>
MessageListItem.java
public class MessageListItem {
private String messageSnippet;
private int iconId;
private String date;
public MessageListItem(String messageSnippet, String date) {
this.messageSnippet = messageSnippet;
this.iconId = R.drawable.ic_action_mail_blue;
this.date = date;
}
public String getMessageSnippet() {
return messageSnippet;
}
public void setMessageSnippet(String messageSnippet) {
this.messageSnippet = messageSnippet;
}
public int getIconId() {
return iconId;
}
public void setIconId(int iconID) {
this.iconId = iconID;
}
public String getMessageDate() {
return date;
}
public void setMessageDate(String status) {
this.date = status;
}
}
MessageListAdapter.java
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class MessageListAdapter extends BaseAdapter {
Activity context;
LayoutInflater inflater;
ArrayList<Object> rowItems;
public MessageListAdapter(Activity context, ArrayList<Object> rowItems) {
this.context = context;
this.rowItems = rowItems;
}
@Override
public int getCount() {
return rowItems.size();
}
@Override
public Object getItem(int position) {
return rowItems.get(position);
}
@Override
public long getItemId(int position) {
return rowItems.indexOf(getItem(position));
}
public static class ViewHolder {
ImageView icon;
TextView messageSnippet;
TextView messageDate;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if(convertView==null)
{
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.messagelistrow, null);
holder.icon = (ImageView) convertView.findViewById(R.id.icon);
holder.messageSnippet = (TextView) convertView.findViewById(R.id.messageSnippet);
holder.messageDate = (TextView) convertView.findViewById(R.id.messageDate);
convertView.setTag(holder);
}
else
holder=(ViewHolder)convertView.getTag();
MessageListItem ml = (MessageListItem) rowItems.get(position);
holder.icon.setImageResource(ml.getIconId());
holder.messageSnippet.setText(ml.getMessageSnippet());
holder.messageDate.setText(ml.getMessageDate());
return convertView;
}
}
HistoryMessageListFragment.java
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.Toast;
public class HistoryMessageListFragment extends Fragment{
private OnItemSelectedListener listener;
String[] messageSnippets;
Integer iconID;
String[] messageDates;
ArrayList<Object> messageListRowItems;
ListView messageListView;
MessageListItem item;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.historylist, container, false);
prepareArrayLits();
messageListView = (ListView) view.findViewById(R.id.messageList);
MessageListAdapter adapter = new MessageListAdapter(getActivity(), messageListRowItems);
messageListView.setAdapter(adapter);
messageListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
String item = "Hallo";
Toast.makeText(getActivity(), item, Toast.LENGTH_LONG).show();
}
});
return view;
}
public interface OnItemSelectedListener {
public void onMessageSelected(String link);
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
if (activity instanceof OnItemSelectedListener) {
listener = (OnItemSelectedListener) activity;
} else {
throw new ClassCastException(activity.toString()
+ " must implemenet MyListFragment.OnItemSelectedListener");
}
}
public void prepareArrayLits()
{
messageListRowItems = new ArrayList<Object>();
AddObjectToList(R.drawable.ic_action_mail_blue,
getResources().getStringArray(R.array.messageSnippets)[0],
getResources().getStringArray(R.id.messageDate)[0]);
}
// Add one item into the Array List
public void AddObjectToList(int image, String messageSnippet, String messageDate)
{
item = new MessageListItem(messageSnippet, messageDate);
item.setIconId(image);
messageListRowItems.add(item);
}
// May also be triggered from the Activity
public void updateDetail() {
// create fake data
String newTime = String.valueOf(System.currentTimeMillis());
// Send data to Activity
listener.onMessageSelected(newTime);
}
}
HistoryMessageListActivity.java
package o2.telefonica.mma.ABHC;
import o2.telefonica.mma.ABHC.settings.Results;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class HistoryMessageListActivity extends Activity implements
MenuItem.OnMenuItemClickListener, HistoryMessageListFragment.OnItemSelectedListener{
private MenuItem action_about;
private MenuItem action_exit;
private MenuItem action_settings;
private MenuItem action_newMessage;
private MenuItem action_delete;
private MenuItem action_search;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.history);
}
@Override
public void onMessageSelected(String link) {
HistoryMessageFragment fragment = (HistoryMessageFragment) getFragmentManager()
.findFragmentById(R.id.detailFragment);
if (fragment != null && fragment.isInLayout()) {
fragment.setMessageText(link);
} else {
Intent intent = new Intent(getApplicationContext(), HistoryMessageActivity.class);
intent.putExtra(HistoryMessageActivity.EXTRA_URL, link);
startActivityForResult(intent, Results.START_ACTIVITY);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.history_activity_actions, menu);
this.action_about = menu.findItem(R.id.action_about);
this.action_about.setOnMenuItemClickListener(this);
this.action_exit = menu.findItem(R.id.action_exit);
this.action_exit.setOnMenuItemClickListener(this);
this.action_settings = menu.findItem(R.id.action_settings);
this.action_settings.setOnMenuItemClickListener(this);
this.action_newMessage = menu.findItem(R.id.action_newMessage);
this.action_newMessage.setOnMenuItemClickListener(this);
this.action_delete = menu.findItem(R.id.action_delete);
this.action_delete.setOnMenuItemClickListener(this);
this.action_search = menu.findItem(R.id.action_search);
this.action_search.setOnMenuItemClickListener(this);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onMenuItemClick(MenuItem item) {
if (item.getItemId() == R.id.action_delete) {
//TODO Delete Message
return true;
} else if (item.getItemId() == R.id.action_newMessage) {
//setContentView(R.layout.history);
finish();
//new HistoryController(this, R.layout.history, m);
return true;
} else if (item.getItemId() == R.id.action_about) {
//setContentView(R.layout.about);
startActivityForResult(new Intent(this, AboutActivity.class), Results.START_ACTIVITY);
//new AboutController(this, R.layout.about, m);
return true;
} else if (item.getItemId() == R.id.action_settings) {
//setContentView(R.layout.settings);
startActivityForResult(new Intent(this, SettingsActivity.class), Results.START_ACTIVITY);
//new SettingsController(this, R.layout.settings, m);
return true;
} else if (item.getItemId() == R.id.action_exit) {
//TODO exit
return true;
} else if (item.getItemId() == R.id.action_search) {
//TODO search function
return true;
}
return false;
}
}
historylist.xml（片段布局）
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/historyView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="top"
android:background="@null"
android:gravity="center"
android:orientation="vertical"
android:paddingBottom="12dp"
android:paddingLeft="21dp"
android:paddingRight="21dp"
android:paddingTop="12dp" >
<TextView
android:id="@+id/historyMessagesListLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:paddingBottom="@dimen/spacingLabelToText"
android:text="@string/historyMessagesLabel"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#ffffff"
android:textSize="@dimen/titleTextSize" />
<ListView
android:id="@+id/messageList"
android:layout_width="450dp"
android:layout_height="fill_parent"
android:layout_alignParentBottom="true"
android:layout_below="@+id/historyMessagesListLabel"
android:layout_centerHorizontal="true"
android:background="@drawable/textfieldshape"
android:minWidth="450dp"
android:textColor="#ffffff" >
</ListView>
</RelativeLayout>
logcat（更新）
06-27 21:44:32.685: I/Timeline(7980): Timeline: Activity_idle id: android.os.BinderProxy@64b28c80 time:113147909
06-27 21:44:35.137: I/Timeline(7980): Timeline: Activity_launch_request id:o2.telefonica.mma.ABHC time:113150356
06-27 21:44:35.197: I/art(7980): GcCauseBackground partial concurrent mark sweep GC freed 14537(802KB) AllocSpace objects, 2(32KB) LOS objects, 6% free, 13MB/14MB, paused 12.451ms total 76.324ms
06-27 21:44:35.708: I/Timeline(7980): Timeline: Activity_idle id: android.os.BinderProxy@64b91c10 time:113150926
06-27 21:44:37.109: I/Timeline(7980): Timeline: Activity_launch_request id:o2.telefonica.mma.ABHC time:113152336
06-27 21:44:37.149: E/ActivityThread(7980): Failed to inflate
06-27 21:44:37.149: E/ActivityThread(7980): android.view.InflateException: Binary XML file line #8: Error inflating class fragment
06-27 21:44:37.149: E/ActivityThread(7980): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:713)
06-27 21:44:37.149: E/ActivityThread(7980): at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
06-27 21:44:37.149: E/ActivityThread(7980): at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
06-27 21:44:37.149: E/ActivityThread(7980): at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
06-27 21:44:37.149: E/ActivityThread(7980): at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
06-27 21:44:37.149: E/ActivityThread(7980): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:343)
06-27 21:44:37.149: E/ActivityThread(7980): at android.app.Activity.setContentView(Activity.java:1929)
06-27 21:44:37.149: E/ActivityThread(7980): at o2.telefonica.mma.ABHC.HistoryMessageListActivity.onCreate(HistoryMessageListActivity.java:23)
06-27 21:44:37.149: E/ActivityThread(7980): at android.app.Activity.performCreate(Activity.java:5231)
06-27 21:44:37.149: E/ActivityThread(7980): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
06-27 21:44:37.149: E/ActivityThread(7980): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2167)
06-27 21:44:37.149: E/ActivityThread(7980): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2262)
06-27 21:44:37.149: E/ActivityThread(7980): at android.app.ActivityThread.access$800(ActivityThread.java:145)
06-27 21:44:37.149: E/ActivityThread(7980): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1206)
06-27 21:44:37.149: E/ActivityThread(7980): at android.os.Handler.dispatchMessage(Handler.java:102)
06-27 21:44:37.149: E/ActivityThread(7980): at android.os.Looper.loop(Looper.java:136)
06-27 21:44:37.149: E/ActivityThread(7980): at android.app.ActivityThread.main(ActivityThread.java:5137)
06-27 21:44:37.149: E/ActivityThread(7980): at java.lang.reflect.Method.invoke(Native Method)
06-27 21:44:37.149: E/ActivityThread(7980): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
06-27 21:44:37.149: E/ActivityThread(7980): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:611)
06-27 21:44:37.149: E/ActivityThread(7980): Caused by: java.lang.NullPointerException
06-27 21:44:37.149: E/ActivityThread(7980): at java.lang.VMClassLoader.findLoadedClass(Native Method)
06-27 21:44:37.149: E/ActivityThread(7980): at java.lang.ClassLoader.findLoadedClass(ClassLoader.java:362)
06-27 21:44:37.149: E/ActivityThread(7980): at java.lang.ClassLoader.loadClass(ClassLoader.java:499)
06-27 21:44:37.149: E/ActivityThread(7980): at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
06-27 21:44:37.149: E/ActivityThread(7980): at android.app.Fragment.instantiate(Fragment.java:583)
06-27 21:44:37.149: E/ActivityThread(7980): at android.app.Fragment.instantiate(Fragment.java:561)
06-27 21:44:37.149: E/ActivityThread(7980): at android.app.Activity.onCreateView(Activity.java:4778)
06-27 21:44:37.149: E/ActivityThread(7980): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:689)
06-27 21:44:37.149: E/ActivityThread(7980): ... 19 more
06-27 21:44:37.149: D/AndroidRuntime(7980): Shutting down VM
06-27 21:44:37.159: E/AndroidRuntime(7980): FATAL EXCEPTION: main
06-27 21:44:37.159: E/AndroidRuntime(7980): Process: o2.telefonica.mma.ABHC, PID: 7980
06-27 21:44:37.159: E/AndroidRuntime(7980): java.lang.RuntimeException: Unable to start activity ComponentInfo{o2.telefonica.mma.ABHC/o2.telefonica.mma.ABHC.HistoryMessageListActivity}: android.view.InflateException: Binary XML file line #8: Error inflating class fragment
06-27 21:44:37.159: E/AndroidRuntime(7980): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2213)
06-27 21:44:37.159: E/AndroidRuntime(7980): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2262)
06-27 21:44:37.159: E/AndroidRuntime(7980): at android.app.ActivityThread.access$800(ActivityThread.java:145)
06-27 21:44:37.159: E/AndroidRuntime(7980): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1206)
06-27 21:44:37.159: E/AndroidRuntime(7980): at android.os.Handler.dispatchMessage(Handler.java:102)
06-27 21:44:37.159: E/AndroidRuntime(7980): at android.os.Looper.loop(Looper.java:136)
06-27 21:44:37.159: E/AndroidRuntime(7980): at android.app.ActivityThread.main(ActivityThread.java:5137)
06-27 21:44:37.159: E/AndroidRuntime(7980): at java.lang.reflect.Method.invoke(Native Method)
06-27 21:44:37.159: E/AndroidRuntime(7980): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
06-27 21:44:37.159: E/AndroidRuntime(7980): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:611)
06-27 21:44:37.159: E/AndroidRuntime(7980): Caused by: android.view.InflateException: Binary XML file line #8: Error inflating class fragment
06-27 21:44:37.159: E/AndroidRuntime(7980): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:713)
06-27 21:44:37.159: E/AndroidRuntime(7980): at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
06-27 21:44:37.159: E/AndroidRuntime(7980): at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
06-27 21:44:37.159: E/AndroidRuntime(7980): at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
06-27 21:44:37.159: E/AndroidRuntime(7980): at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
06-27 21:44:37.159: E/AndroidRuntime(7980): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:343)
06-27 21:44:37.159: E/AndroidRuntime(7980): at android.app.Activity.setContentView(Activity.java:1929)
06-27 21:44:37.159: E/AndroidRuntime(7980): at o2.telefonica.mma.ABHC.HistoryMessageListActivity.onCreate(HistoryMessageListActivity.java:23)
06-27 21:44:37.159: E/AndroidRuntime(7980): at android.app.Activity.performCreate(Activity.java:5231)
06-27 21:44:37.159: E/AndroidRuntime(7980): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
06-27 21:44:37.159: E/AndroidRuntime(7980): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2167)
06-27 21:44:37.159: E/AndroidRuntime(7980): ... 9 more
06-27 21:44:37.159: E/AndroidRuntime(7980): Caused by: java.lang.NullPointerException
06-27 21:44:37.159: E/AndroidRuntime(7980): at java.lang.VMClassLoader.findLoadedClass(Native Method)
06-27 21:44:37.159: E/AndroidRuntime(7980): at java.lang.ClassLoader.findLoadedClass(ClassLoader.java:362)
06-27 21:44:37.159: E/AndroidRuntime(7980): at java.lang.ClassLoader.loadClass(ClassLoader.java:499)
06-27 21:44:37.159: E/AndroidRuntime(7980): at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
06-27 21:44:37.159: E/AndroidRuntime(7980): at android.app.Fragment.instantiate(Fragment.java:583)
06-27 21:44:37.159: E/AndroidRuntime(7980): at android.app.Fragment.instantiate(Fragment.java:561)
06-27 21:44:37.159: E/AndroidRuntime(7980): at android.app.Activity.onCreateView(Activity.java:4778)
06-27 21:44:37.159: E/AndroidRuntime(7980): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:689)
06-27 21:44:37.159: E/AndroidRuntime(7980): ... 19 more
history.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:baselineAligned="false" >
<fragment
android:id="@+id/listFragment"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_gravity="top"
android:layout_weight="1" />
<fragment
android:id="@+id/detailFragment"
android:layout_width="0dp"
android:layout_weight="2"
android:layout_height="match_parent" />
</LinearLayout>
如果您需要更多信息，请随时提出。
提前致谢。
答案 0 :(得分：0)
你的问题在这里：
convertView = inflater.inflate(R.layout.messagelistrow, null);
您未在代码中初始化inflater
你需要：
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
，所以getView方法必须是：
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if(convertView==null)
{
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.messagelistrow, null);
holder.icon = (ImageView) convertView.findViewById(R.id.icon);
holder.messageSnippet = (TextView) convertView.findViewById(R.id.messageSnippet);
holder.messageDate = (TextView) convertView.findViewById(R.id.messageDate);
convertView.setTag(holder);
}
else
holder=(ViewHolder)convertView.getTag();
MessageListItem ml = (MessageListItem) rowItems.get(position);
holder.icon.setImageResource(ml.getIconId());
holder.messageSnippet.setText(ml.getMessageSnippet());
holder.messageDate.setText(ml.getMessageDate());
return convertView;
}
另一个问题是历史xml文件：第8行
Binary XML file line #8: Error inflating class fragment
您需要将fragment更改为FrameLayout