Java 静态SharedReference NoClassDefFoundError

我正在尝试使用共享首选项在jdbc字符串中填充dbname。我得到的错误是

03-06 15:46:25.941: E/AndroidRuntime(3605): Caused by: java.lang.NoClassDefFoundError: com/vr/activities/DatabaseConnection

JDBC连接工作得很好，但无法与共享首选项一起工作

这是我的密码：

公共类数据库连接扩展活动{

public static Context dbContext;
private static Connection connection = null;
private static DatabaseConnection instance = null;
private final static String DRIVER = "org.postgresql.Driver";

public static class pro

{
    public static String dbname() {
        PreferenceHelper preferenceHelper = new PreferenceHelper(dbContext);
        return preferenceHelper.getDBname();
    }
}
 static String dbname=pro.dbname();

private final static String DATABASE = dbname;


    //constructor
    public DatabaseConnection() {
    super();
    }

Android Manifest.xml

  <activity
        android:name=".activities.DatabaseConnection"
        android:label="@string/database_connection"
        android:parentActivityName=".activities.MainActivity" >
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value=".activities.MainActivity" />
    </activity>

以下是堆栈跟踪：

03-06 16:39:59.910: E/AndroidRuntime(1854): FATAL EXCEPTION: AsyncTask #1
03-06 16:39:59.910: E/AndroidRuntime(1854): Process: com.vr PID: 1854
03-06 16:39:59.910: E/AndroidRuntime(1854): java.lang.RuntimeException: An error occured while executing doInBackground()
03-06 16:39:59.910: E/AndroidRuntime(1854):     at android.os.AsyncTask$3.done(AsyncTask.java:300)
03-06 16:39:59.910: E/AndroidRuntime(1854):     at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
03-06 16:39:59.910: E/AndroidRuntime(1854):     at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
03-06 16:39:59.910: E/AndroidRuntime(1854):     at java.util.concurrent.FutureTask.run(FutureTask.java:242)
03-06 16:39:59.910: E/AndroidRuntime(1854):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
03-06 16:39:59.910: E/AndroidRuntime(1854):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
03-06 16:39:59.910: E/AndroidRuntime(1854):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
03-06 16:39:59.910: E/AndroidRuntime(1854):     at java.lang.Thread.run(Thread.java:841)
03-06 16:39:59.910: E/AndroidRuntime(1854): Caused by: java.lang.NoClassDefFoundError: com/vr/activities/DatabaseConnection
03-06 16:39:59.910: E/AndroidRuntime(1854):     at com.vr.activities.MaintenanceActivity$1$2$1LongOperation.doInBackground(MaintenanceActivity.java:91)
03-06 16:39:59.910: E/AndroidRuntime(1854):     at com.vr.activities.MaintenanceActivity$1$2$1LongOperation.doInBackground(MaintenanceActivity.java:72)
03-06 16:39:59.910: E/AndroidRuntime(1854):     at android.os.AsyncTask$2.call(AsyncTask.java:288)
03-06 16:39:59.910: E/AndroidRuntime(1854):     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
03-06 16:39:59.910: E/AndroidRuntime(1854):     ... 4 more
03-06 16:39:59.920: W/ActivityManager(1274):   Force finishing activity com.vr/.activities.MaintenanceActivity

---

请发布完整的stacktrace并指向代码中崩溃的那一行。您的包名是什么？

com.vr.activities

？我不得不修改它以隐藏实际的包名

java.lang.NoClassDefFoundError

在启动时初始化类失败时经常发生。在此错误之前是否有相关错误日志文件中的r消息？恐怕没有。没有其他错误。除了post.Rest中的堆栈跟踪之外，所有都与声音池相关，因为我使用的是模拟器

03-06 16:39:59.910: E/AndroidRuntime(1854): FATAL EXCEPTION: AsyncTask #1
03-06 16:39:59.910: E/AndroidRuntime(1854): Process: com.vr PID: 1854
03-06 16:39:59.910: E/AndroidRuntime(1854): java.lang.RuntimeException: An error occured while executing doInBackground()
03-06 16:39:59.910: E/AndroidRuntime(1854):     at android.os.AsyncTask$3.done(AsyncTask.java:300)
03-06 16:39:59.910: E/AndroidRuntime(1854):     at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
03-06 16:39:59.910: E/AndroidRuntime(1854):     at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
03-06 16:39:59.910: E/AndroidRuntime(1854):     at java.util.concurrent.FutureTask.run(FutureTask.java:242)
03-06 16:39:59.910: E/AndroidRuntime(1854):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
03-06 16:39:59.910: E/AndroidRuntime(1854):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
03-06 16:39:59.910: E/AndroidRuntime(1854):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
03-06 16:39:59.910: E/AndroidRuntime(1854):     at java.lang.Thread.run(Thread.java:841)
03-06 16:39:59.910: E/AndroidRuntime(1854): Caused by: java.lang.NoClassDefFoundError: com/vr/activities/DatabaseConnection
03-06 16:39:59.910: E/AndroidRuntime(1854):     at com.vr.activities.MaintenanceActivity$1$2$1LongOperation.doInBackground(MaintenanceActivity.java:91)
03-06 16:39:59.910: E/AndroidRuntime(1854):     at com.vr.activities.MaintenanceActivity$1$2$1LongOperation.doInBackground(MaintenanceActivity.java:72)
03-06 16:39:59.910: E/AndroidRuntime(1854):     at android.os.AsyncTask$2.call(AsyncTask.java:288)
03-06 16:39:59.910: E/AndroidRuntime(1854):     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
03-06 16:39:59.910: E/AndroidRuntime(1854):     ... 4 more
03-06 16:39:59.920: W/ActivityManager(1274):   Force finishing activity com.vr/.activities.MaintenanceActivity