谷歌地图Android API v2 ClassNotFound运行时错误

Question

编辑：对于那些遇到困难的人，请查看此链接。仔细按照它的要求操作，但它确实有效！关键部分是使用keytool针对您的调试密钥库生成SHA1哈希值。另外，也不要忘记为发布添加一个！

我一直在尝试设置Google Maps Android API v2，但是在按照说明设置了一切后，我收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

你们有没有遇到过这种情况？

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);
    }
}

- ingh.am

Answer 1

您的Activity需要扩展来自支持库的FragmentActivity

- Blundell

Answer 2

尝试这段代码，它能完美地帮助你。

XML

<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=".MainActivity" >

    <fragment
        android:id="@+id/map"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        class="com.google.android.gms.maps.SupportMapFragment"/>

</RelativeLayout>

Java

package com.example.androidmapsv2;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;

import android.app.AlertDialog;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

public class MainActivity extends FragmentActivity {
 final int RQS_GooglePlayServices = 1;
 private GoogleMap myMap;

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

   FragmentManager myFragmentManager = getSupportFragmentManager();
   SupportMapFragment mySupportMapFragment 
    = (SupportMapFragment)myFragmentManager.findFragmentById(R.id.map);
   myMap = mySupportMapFragment.getMap();
 } 
@Override
 protected void onResume() {
  // TODO Auto-generated method stub
  super.onResume();

  int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext());

  if (resultCode == ConnectionResult.SUCCESS){
   Toast.makeText(getApplicationContext(), 
     "isGooglePlayServicesAvailable SUCCESS", 
     Toast.LENGTH_LONG).show();
  }else{
   GooglePlayServicesUtil.getErrorDialog(resultCode, this, RQS_GooglePlayServices);
  }
 }
}

- KeTaN

---

最终我搞定了，但它比这种方法简单多了！使用那段代码，我无法显示映射图像，但控件已加载。 - ingh.am

实际上，您提供给KeTaN的链接是关于API v1的，但问题是关于API v2的。 - Henadzi Rabkin

Answer 3

你是在模拟器上运行吗？如果是，请尝试在真实设备上运行。

- Akexorcist

---

上面的回答解决了这个问题，是的，我确实阅读了有关 AVD 的文档 ;) - ingh.am