android - 无法实例化 android.gms.maps.MapFragment

Question

我尝试用非常简单的 Activity 用 google maps android v2 做一个演示，只需从 google 页面复制代码: https://developers.google.com/maps/documentation/android/start#adding_the_api_key_to_your_application

Activity :

package com.example.mapdemo;

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

public class MainActivity extends Activity {

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

布局:

<?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"/>

我已经根据页面申请了一个api key ，并修改了我的androidmanifest.xml文件，就像这样:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.wenhai.driverschool"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />

    <uses-permission android:name="android.permission.INTERNET" />

    <!-- add for map2 -->
    <permission
        android:name="com.example.mapdemo.permission.MAPS_RECEIVE"
        android:protectionLevel="signature" />

    <uses-permission android:name="com.example.mapdemo.permission.MAPS_RECEIVE" />
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
    <!-- External storage for caching. -->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <!-- Maps API needs OpenGL ES 2.0. -->
    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="AIzaSyDVAF4WaVSVRDKJx87It8OSFP5txQcPabc" />

        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

我还在 Eclipse 中将我的应用程序引用到 google-play-services_lib。

但每次，logcat 中的错误报告如下:

2-05 16:22:53.609: E/AndroidRuntime(21623): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.wenhai.driverschool/com.wenhai.driverschool.MainActivity}: android.view.InflateException: Binary XML file line #2: Error inflating class fragment
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1967)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.ActivityThread.access$600(ActivityThread.java:127)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.os.Handler.dispatchMessage(Handler.java:99)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.os.Looper.loop(Looper.java:137)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.ActivityThread.main(ActivityThread.java:4441)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at java.lang.reflect.Method.invokeNative(Native Method)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at java.lang.reflect.Method.invoke(Method.java:511)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at dalvik.system.NativeStart.main(Native Method)
12-05 16:22:53.609: E/AndroidRuntime(21623): Caused by: android.view.InflateException: Binary XML file line #2: Error inflating class fragment
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:697)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.view.LayoutInflater.inflate(LayoutInflater.java:466)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:255)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.Activity.setContentView(Activity.java:1835)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at com.wenhai.driverschool.MainActivity.onCreate(MainActivity.java:11)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.Activity.performCreate(Activity.java:4465)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1931)
12-05 16:22:53.609: E/AndroidRuntime(21623):    ... 11 more
12-05 16:22:53.609: E/AndroidRuntime(21623): Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.google.android.gms.maps.MapFragment: make sure class name exists, is public, and has an empty constructor that is public
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.Fragment.instantiate(Fragment.java:581)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.Fragment.instantiate(Fragment.java:549)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.Activity.onCreateView(Activity.java:4235)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:673)
12-05 16:22:53.609: E/AndroidRuntime(21623):    ... 20 more
12-05 16:22:53.609: E/AndroidRuntime(21623): Caused by: java.lang.ClassNotFoundException: com.google.android.gms.maps.MapFragment
12-05 16:22:53.609: E/AndroidRuntime(21623):    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.Fragment.instantiate(Fragment.java:571)
12-05 16:22:53.609: E/AndroidRuntime(21623):    ... 23 more

我不知道这是什么原因。

如果我将google-play-services.jar添加到我的项目中，它会报告另一个错误:

12-05 16:34:23.269: E/AndroidRuntime(22638): FATAL EXCEPTION: main
12-05 16:34:23.269: E/AndroidRuntime(22638): java.lang.NoClassDefFoundError: com.google.android.gms.R$styleable
12-05 16:34:23.269: E/AndroidRuntime(22638):    at com.google.android.gms.maps.GoogleMapOptions.createFromAttributes(Unknown Source)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at com.google.android.gms.maps.MapFragment.onInflate(Unknown Source)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.app.Activity.onCreateView(Activity.java:4242)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:673)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.view.LayoutInflater.inflate(LayoutInflater.java:466)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:255)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.app.Activity.setContentView(Activity.java:1835)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at com.wenhai.driverschool.MainActivity.onCreate(MainActivity.java:11)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.app.Activity.performCreate(Activity.java:4465)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1931)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.app.ActivityThread.access$600(ActivityThread.java:127)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.os.Handler.dispatchMessage(Handler.java:99)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.os.Looper.loop(Looper.java:137)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.app.ActivityThread.main(ActivityThread.java:4441)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at java.lang.reflect.Method.invokeNative(Native Method)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at java.lang.reflect.Method.invoke(Method.java:511)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at dalvik.system.NativeStart.main(Native Method)

有人可以帮我解决这个问题吗？

Answer 1

在 IntelliJ IDEA 中(针对 IntelliJ 12 更新):

1. 创建文件~/android-sdk/extras/google/google_play_services/libproject/google-play-services_lib/src/dummy.java包含 class dummy {} .
2. 文件->导入模块-> ~/android-sdk/extras/google/google_play_services/libproject/google-play-services_lib
3. 从现有源创建模块
4. 下一步->下一步->下一步->下一步->完成
5. 文件->项目结构->模块->YourApp
6. +->Module Dependency->Google-play-services_lib(+ 按钮在对话框的右上角。)
7. +-> jar 或目录-> ~/android-sdk/extras/google/google_play_services/libproject/google-play-services_lib/libs/google-play-services.jar
8. 使用上/下箭头移动<Module source>到列表底部。

您可以删除dummy.java如果你喜欢。

编辑:使用了一段时间后，我发现有一个小缺陷/错误。 IDEA有时会提示无法打开.iml google-play-services_lib 中的项目文件目录，尽管您从未告诉它那里有一个项目。如果发生这种情况，重建项目可以解决问题，至少在它恢复之前是这样。