java – Google Maps Android API v2 ClassNotFound运行时错误

我一直在尝试设置谷歌地图Android API v2并在设置了所有内容后说我得到了这个运行时异常ClassNotFound：

01-02 16:29:07.927: E/AndroidRuntime(12508): FATAL EXCEPTION: main
01-02 16:29:07.927: E/AndroidRuntime(12508): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.app/com.example.app.MapActivity}: android.view.InflateException: Binary XML file line #6: Error inflating class fragment
01-02 16:29:07.927: E/AndroidRuntime(12508):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1659)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1675)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at android.app.ActivityThread.access$1500(ActivityThread.java:121)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:943)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at android.os.Handler.dispatchMessage(Handler.java:99)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at android.os.Looper.loop(Looper.java:130)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at android.app.ActivityThread.main(ActivityThread.java:3701)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at java.lang.reflect.Method.invokeNative(Native Method)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at java.lang.reflect.Method.invoke(Method.java:507)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:624)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at dalvik.system.NativeStart.main(Native Method)
01-02 16:29:07.927: E/AndroidRuntime(12508): Caused by: android.view.InflateException: Binary XML file line #6: Error inflating class fragment
01-02 16:29:07.927: E/AndroidRuntime(12508):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:581)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:623)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at android.view.LayoutInflater.inflate(LayoutInflater.java:408)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:227)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at android.app.Activity.setContentView(Activity.java:1657)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at com.example.app.MapActivity.onCreate(MapActivity.java:11)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1623)
01-02 16:29:07.927: E/AndroidRuntime(12508):    ... 11 more
01-02 16:29:07.927: E/AndroidRuntime(12508): Caused by: java.lang.ClassNotFoundException: android.view.fragment in loader dalvik.system.PathClassLoader[/data/app/com.example.app-1.apk]
01-02 16:29:07.927: E/AndroidRuntime(12508):    at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at android.view.LayoutInflater.createView(LayoutInflater.java:471)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at android.view.LayoutInflater.onCreateView(LayoutInflater.java:549)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:66)
01-02 16:29:07.927: E/AndroidRuntime(12508):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:568)
01-02 16:29:07.927: E/AndroidRuntime(12508):    ... 20 more

有没有人曾经遇到过这个？

XML：

<?xml version="1.0" encoding="utf-8"?>
<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"/>

MapActivity：

import android.os.Bundle;
import android.app.Activity;

public class MapActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_map);
    }
}