我正在尝试将使用版本 2 API 的 Google Maps 视图添加到内置的 Android Master Detail 流中。出于某种原因，我收到一个错误膨胀类片段异常：
12-29 22:47:05.828: E/AndroidRuntime(1655): FATAL EXCEPTION: main
12-29 22:47:05.828: E/AndroidRuntime(1655): android.view.InflateException: Binary XML file line #48: Error inflating class fragment
12-29 22:47:05.828: E/AndroidRuntime(1655): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:697)
12-29 22:47:05.828: E/AndroidRuntime(1655): at android.view.LayoutInflater.rInflate(LayoutInflater.java:739)
12-29 22:47:05.828: E/AndroidRuntime(1655): at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
12-29 22:47:05.828: E/AndroidRuntime(1655): at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
12-29 22:47:05.828: E/AndroidRuntime(1655): at com.reading.trackitparent.MapDetailFragment.onCreateView(MapDetailFragment.java:52)
12-29 22:47:05.828: E/AndroidRuntime(1655): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
12-29 22:47:05.828: E/AndroidRuntime(1655): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
12-29 22:47:05.828: E/AndroidRuntime(1655): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
12-29 22:47:05.828: E/AndroidRuntime(1655): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
12-29 22:47:05.828: E/AndroidRuntime(1655): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
12-29 22:47:05.828: E/AndroidRuntime(1655): at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:429)
12-29 22:47:05.828: E/AndroidRuntime(1655): at android.os.Handler.handleCallback(Handler.java:605)
12-29 22:47:05.828: E/AndroidRuntime(1655): at android.os.Handler.dispatchMessage(Handler.java:92)
12-29 22:47:05.828: E/AndroidRuntime(1655): at android.os.Looper.loop(Looper.java:137)
12-29 22:47:05.828: E/AndroidRuntime(1655): at android.app.ActivityThread.main(ActivityThread.java:4424)
12-29 22:47:05.828: E/AndroidRuntime(1655): at java.lang.reflect.Method.invokeNative(Native Method)
12-29 22:47:05.828: E/AndroidRuntime(1655): at java.lang.reflect.Method.invoke(Method.java:511)
12-29 22:47:05.828: E/AndroidRuntime(1655): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
12-29 22:47:05.828: E/AndroidRuntime(1655): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
12-29 22:47:05.828: E/AndroidRuntime(1655): at dalvik.system.NativeStart.main(Native Method)
12-29 22:47:05.828: E/AndroidRuntime(1655): Caused by: java.lang.ClassCastException: com.google.android.gms.maps.MapFragment cannot be cast to android.support.v4.app.Fragment
12-29 22:47:05.828: E/AndroidRuntime(1655): at android.support.v4.app.Fragment.instantiate(Fragment.java:394)
12-29 22:47:05.828: E/AndroidRuntime(1655): at android.support.v4.app.Fragment.instantiate(Fragment.java:369)
12-29 22:47:05.828: E/AndroidRuntime(1655): at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:272)
12-29 22:47:05.828: E/AndroidRuntime(1655): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:669)
我创建了一个新的 MapDetailFragment：
package com.reading.trackitparent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.reading.trackitparent.dummy.DummyContent;
/**
* A fragment representing a single Item detail screen. This fragment is either
* contained in a {@link ItemListActivity} in two-pane mode (on tablets) or a
* {@link ItemDetailActivity} on handsets.
*/
public class MapDetailFragment extends Fragment {
/**
* The fragment argument representing the item ID that this fragment
* represents.
*/
public static final String ARG_ITEM_ID = "item_id";
/**
* The dummy content this fragment is presenting.
*/
private DummyContent.DummyItem mItem;
/**
* Mandatory empty constructor for the fragment manager to instantiate the
* fragment (e.g. upon screen orientation changes).
*/
public MapDetailFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments().containsKey(ARG_ITEM_ID)) {
// Load the dummy content specified by the fragment
// arguments. In a real-world scenario, use a Loader
// to load content from a content provider.
mItem = DummyContent.ITEM_MAP.get(getArguments().getString(
ARG_ITEM_ID));
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_map_detail,
container, false);
// // Show the dummy content as text in a TextView.
// if (mItem != null) {
// ((TextView) rootView.findViewById(R.id.item_detail))
// .setText(mItem.content);
// }
return rootView;
}
}
我正在尝试使用以下布局：
<RelativeLayout 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=".ItemDetailActivity" >
<fragment
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.MapFragment" />
</RelativeLayout>
项目列表活动：
package com.reading.trackitparent;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
/**
* An activity representing a list of Items. This activity has different
* presentations for handset and tablet-size devices. On handsets, the activity
* presents a list of items, which when touched, lead to a
* {@link ItemDetailActivity} representing item details. On tablets, the
* activity presents the list of items and item details side-by-side using two
* vertical panes.
* <p>
* The activity makes heavy use of fragments. The list of items is a
* {@link ItemListFragment} and the item details (if present) is a
* {@link ItemDetailFragment}.
* <p>
* This activity also implements the required {@link ItemListFragment.Callbacks}
* interface to listen for item selections.
*/
public class ItemListActivity extends FragmentActivity implements
ItemListFragment.Callbacks {
/**
* Whether or not the activity is in two-pane mode, i.e. running on a tablet
* device.
*/
private boolean mTwoPane;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_item_list);
if (findViewById(R.id.item_detail_container) != null) {
// The detail container view will be present only in the
// large-screen layouts (res/values-large and
// res/values-sw600dp). If this view is present, then the
// activity should be in two-pane mode.
mTwoPane = true;
// In two-pane mode, list items should be given the
// 'activated' state when touched.
((ItemListFragment) getSupportFragmentManager().findFragmentById(
R.id.item_list)).setActivateOnItemClick(true);
}
// TODO: If exposing deep links into your app, handle intents here.
}
/**
* Callback method from {@link ItemListFragment.Callbacks} indicating that
* the item with the given ID was selected.
*/
@Override
public void onItemSelected(String id) {
if (mTwoPane) {
// In two-pane mode, show the detail view in this activity by
// adding or replacing the detail fragment using a
// fragment transaction.
Bundle arguments = new Bundle();
arguments.putString(MapDetailFragment.ARG_ITEM_ID, id);
MapDetailFragment fragment = new MapDetailFragment();
fragment.setArguments(arguments);
getSupportFragmentManager().beginTransaction()
.replace(R.id.item_detail_container, fragment).commit();
} else {
// In single-pane mode, simply start the detail activity
// for the selected item ID.
Intent detailIntent = new Intent(this, ItemDetailActivity.class);
detailIntent.putExtra(MapDetailFragment.ARG_ITEM_ID, id);
startActivity(detailIntent);
}
}
}
我已经引用了 Google Play Services Libs。我的清单如下所示：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.reading.trackitparent"
android:versionCode="1"
android:versionName="1.0" >
<permission
android:name="com.reading.trackitparent.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
<uses-permission android:name="com.reading.trackitparent.permission.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
<uses-sdk
android:minSdkVersion="15"
android:targetSdkVersion="15" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.reading.trackitparent.ItemListActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.reading.trackitparent.ItemDetailActivity"
android:label="@string/title_item_detail" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value=".ItemListActivity" />
</activity>
<uses-library android:name="com.google.android.maps" />
</application>
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="xxxxxxxxxxxxxxxxxxxxxxxxxxx" />
</manifest>
我真的很感激任何帮助！