无法在Android上解析MapActivity类

Question

我有一个有11种不同活动的应用程序.其中一项活动是MapActivity的扩展(它是数据可视化的地图).要进行此活动,用户必须首先浏览启动活动,然后执行其他3项活动.启动MapActivity的代码是:

Intent i = new Intent(getBaseContext(), MapVis.class);
i.putExtra("edu.uml.cs.isense.visualizations.session_list", sessions);
startActivity(i);

执行此操作时,我从日志中获得以下输出:

09-01 14:36:22.389: WARN/dalvikvm(592): Class resolved by unexpected DEX: Ledu/uml/cs/isense/visualizations/MapVis;(0x44981910):0x128260 ref [Lcom/google/android/maps/MapActivity;] Lcom/google/android/maps/MapActivity;(0x44981910):0x13d330
09-01 14:36:22.389: WARN/dalvikvm(592): (Ledu/uml/cs/isense/visualizations/MapVis; had used a different Lcom/google/android/maps/MapActivity; during pre-verification)
09-01 14:36:22.389: WARN/dalvikvm(592): Unable to resolve superclass of Ledu/uml/cs/isense/visualizations/MapVis; (118)
09-01 14:36:22.389: WARN/dalvikvm(592): Link of class 'Ledu/uml/cs/isense/visualizations/MapVis;' failed
09-01 14:36:22.389: DEBUG/AndroidRuntime(592): Shutting down VM
09-01 14:36:22.389: WARN/dalvikvm(592): threadid=1: thread exiting with uncaught exception (group=0x4001d7f0)
09-01 14:36:22.399: ERROR/AndroidRuntime(592): FATAL EXCEPTION: main
09-01 14:36:22.399: ERROR/AndroidRuntime(592): java.lang.NoClassDefFoundError: edu.uml.cs.isense.visualizations.MapVis
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at edu.uml.cs.isense.visualizations.Visualizations.onOptionsItemSelected(Visualizations.java:213)
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at android.app.Activity.onMenuItemSelected(Activity.java:2195)
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:730)
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:143)
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:855)
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at com.android.internal.view.menu.IconMenuView.invokeItem(IconMenuView.java:532)
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at com.android.internal.view.menu.IconMenuItemView.performClick(IconMenuItemView.java:122)
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at android.view.View$PerformClick.run(View.java:8816)
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at android.os.Handler.handleCallback(Handler.java:587)
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at android.os.Handler.dispatchMessage(Handler.java:92)
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at android.os.Looper.loop(Looper.java:123)
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at android.app.ActivityThread.main(ActivityThread.java:4627)
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at java.lang.reflect.Method.invokeNative(Native Method)
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at java.lang.reflect.Method.invoke(Method.java:521)
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at dalvik.system.NativeStart.main(Native Method)
09-01 14:36:22.399: ERROR/AndroidRuntime(592): Caused by: java.lang.IllegalAccessError: Class ref in pre-verified class resolved to unexpected implementation
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at dalvik.system.DexFile.defineClass(Native Method)
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at dalvik.system.DexFile.loadClassBinaryName(DexFile.java:209)
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:203)
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
09-01 14:36:22.399: ERROR/AndroidRuntime(592):     ... 17 more
09-01 14:36:22.409: WARN/ActivityManager(92):   Force finishing activity edu.uml.cs.isense/.visualizations.Visualizations
09-01 14:36:22.909: WARN/ActivityManager(92): Activity pause timeout for HistoryRecord{44c84a90 edu.uml.cs.isense/.visualizations.Visualizations}

我确实将目标设置为Google API,这是一个适用于Android 1.5的应用程序,并在清单文件中将minsdk指定为级别3.地图的uses-library也在清单文件中.

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="edu.uml.cs.isense"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-permission android:name="android.permission.WRITE_SETTINGS" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
    <uses-permission android:name="android.permission.CONTROL_LOCATION_UPDATES"/>
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".Isense" 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=".experiments.Experiments" android:label="@string/app_name_experiments"/>
  <activity android:name=".sessions.Sessions" android:label="@string/app_name"/>
  <activity android:name=".people.People" android:label="@string/app_name_people"/>
  <activity android:name=".profile.Profile" android:label="@string/app_name"/>
  <activity android:name=".sensors.Sensors" android:label="@string/app_name_sensors"/>
  <activity android:name=".visualizations.DataTable" android:label="@string/app_name"/>
  <activity android:name=".visualizations.Visualizations" android:label="@string/app_name"/>
  <activity android:name=".sensors.DataListActivity"
                  android:label="@string/selectFile"
                  android:theme="@android:style/Theme.Dialog"
                  android:configChanges="orientation|keyboardHidden" />
        <activity android:name=".sensors.Upload" android:label="@string/app_name_uploader"/>
        <activity android:name=".visualizations.MapVis" android:label="@string/app_name"
            android:theme="@android:style/Theme.NoTitleBar" />
        <uses-library android:name="com.google.android.maps"/>
</application>
    <uses-sdk android:minSdkVersion="3"/>
</manifest>

我已经在这里待了将近2天没有结果.似乎有很多人在从其他活动中启动MapActivity时遇到问题,但在任何地方都没有解决方案.有人有线索吗？谢谢.

Answer 1

问题是您的MapVis类可能会扩展com.google.android.maps.MapActivity.要使系统能够找到这个类,您需要做两件事:

首先确保您的项目在构建路径中包含Android maps.jar.从Eclipse中找到

Project > Properties > Android

然后根据您的应用选择一个"Google API".您可以通过检查确认maps.jar是否在您的构建路径上:

Project > Properties > Java Build Path > Libraries > Expand "Google Apis"

第二步浏览到您的清单文件,并确保将uses-library代码段嵌套在<application>代码中,如下所示:

<manifest>
...
   <application ...>
      <uses-library android:name="com.google.android.maps" />
      ...
   </application>
</manifest>

愿原力与你同在!

Answer 2

显然在某些时候我的构建环境变得非常混乱.看起来我两次在我的项目中使用谷歌API jar,导致冲突.我删除了项目并重新创建它,现在正常工作.

Answer 3

我有同样的问题.

我在构建路径中手动添加maps.jar并使用android 2.1作为目标.这似乎不起作用(不管怎么说都不是2.1),尽管我按照教程说这样做.

我是如何解决它的:

- 删除手动添加的maps.jar然后我将我的构建目标设置为Google API 2.1而不是Android 2.1

之后我意识到maps.jar会自动包含在"Google"Android库中,因此存在冲突.:d

Answer 4

我更新了网络和尚的答案,因为问题不是你没有maps.jar,问题是你有冲突的jar(例如你将maps.jar与android 4.0混合).所以

1. 确保已签入Google APIProject > Properties > Android.如果不是这种情况,请选择它并单击"应用".此更改将修改文件project.properties中的target属性并更改包含的库.(例如使用最新的Android SDK中,你将有:target=Google Inc.:Google APIs:14)
2. 转到Project > Properties > Java Build Path > Libraries并确保没有直接包含android.jar或maps.jar.你应该只有至少有maps.jar和android.jar的Google Apis作为叶子.