android - 当 ORMLite 尝试在 android 上创建带有图像的数据库表时出现 ClassNotFoundException

Question

您好，我正在使用 ORMLite 进行数据库访问。在我添加带有图像的表格后，它因 ClassNotFoundException 而崩溃。

@DatabaseField (dataType = DataType.SERIALIZABLE)
private Image image;

OrmLiteSqliteOpenHelper 子类的onCreate 方法出现如下错误。

01-09 14:45:51.108: W/dalvikvm(1897): Unable to match class for part: 'Landroid/media/Image;'
01-09 14:45:51.118: W/dalvikvm(1897): threadid=12: thread exiting with uncaught exception (group=0x40a13300)
01-09 14:45:51.198: E/AndroidRuntime(1897): FATAL EXCEPTION: AsyncTask #1
01-09 14:45:51.198: E/AndroidRuntime(1897): java.lang.RuntimeException: An error occured while executing doInBackground()
01-09 14:45:51.198: E/AndroidRuntime(1897):     at android.os.AsyncTask$3.done(AsyncTask.java:299)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at java.lang.Thread.run(Thread.java:856)
01-09 14:45:51.198: E/AndroidRuntime(1897): Caused by: java.lang.NoClassDefFoundError: android/media/Image
01-09 14:45:51.198: E/AndroidRuntime(1897):     at java.lang.Class.getDeclaredFields(Native Method)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at java.lang.Class.getDeclaredFields(Class.java:647)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at com.j256.ormlite.android.DatabaseTableConfigUtil.fromClass(DatabaseTableConfigUtil.java:49)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at com.j256.ormlite.db.SqliteAndroidDatabaseType.extractDatabaseTableConfig(SqliteAndroidDatabaseType.java:76)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at com.j256.ormlite.dao.DaoManager.createDao(DaoManager.java:67)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at com.j256.ormlite.table.TableUtils.createTable(TableUtils.java:218)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at com.j256.ormlite.table.TableUtils.createTable(TableUtils.java:53)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at com.example.test.ECDatabaseHelper.onCreate(ECDatabaseHelper.java:84)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at com.j256.ormlite.android.apptools.OrmLiteSqliteOpenHelper.onCreate(OrmLiteSqliteOpenHelper.java:207)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:252)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at com.j256.ormlite.android.AndroidConnectionSource.getReadWriteConnection(AndroidConnectionSource.java:63)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at com.j256.ormlite.android.AndroidConnectionSource.getReadOnlyConnection(AndroidConnectionSource.java:51)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at com.j256.ormlite.dao.BaseDaoImpl.queryForFirst(BaseDaoImpl.java:229)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at com.example.test.ECDatabaseHelper.getLastUpdateStations(ECDatabaseHelper.java:218)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at com.example.test.ECConnect.doUpdate(ECConnect.java:170)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at com.example.test.ECConnect$UpdateTask.doInBackground(ECConnect.java:109)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at com.example.test.ECConnect$UpdateTask.doInBackground(ECConnect.java:1)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at android.os.AsyncTask$2.call(AsyncTask.java:287)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
01-09 14:45:51.198: E/AndroidRuntime(1897):     ... 5 more
01-09 14:45:51.198: E/AndroidRuntime(1897): Caused by: java.lang.ClassNotFoundException: android.media.Image
01-09 14:45:51.198: E/AndroidRuntime(1897):     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
01-09 14:45:51.198: E/AndroidRuntime(1897):     at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
01-09 14:45:51.198: E/AndroidRuntime(1897):     ... 25 more

有人能帮帮我吗？我试过 ORMLite 4.48 和 4.47。

添加ECDatabaseHelper:

public class ECDatabaseHelper extends OrmLiteSqliteOpenHelper    {

    private final String LOG_TAG = getClass().getSimpleName();
    private static final String DATABASE_NAME = "test.db";
    private static final int DATABASE_VERSION = 1;
    private static ECDatabaseHelper  instance = null;

    private Dao<Station, Integer> stationDao = null;
    private Dao<Service, Integer> serviceDao = null;

    public static synchronized ECDatabaseHelper getHelper(Context context) {
        Log.i("ECDatabase", "getHelper");
        if (instance == null) {
            instance = new ECDatabaseHelper(context);
        }
        return instance;
    }

    private ECDatabaseHelper(Context context) {
        super(context.getApplicationContext(), DATABASE_NAME, null, DATABASE_VERSION);
        Log.i("ECDatabase", "ECDatabaseHelper () - constructor");
    }

    @Override
    public void onCreate(SQLiteDatabase db, ConnectionSource connectionSource) {
            try {
                    Log.i(ECDatabaseHelper.class.getName(), "onCreate");
                    TableUtils.createTable(connectionSource, Station.class);
                    Log.i(ECDatabaseHelper.class.getName(), "table station created");
                    TableUtils.createTable(connectionSource, Service.class);
                    Log.i(ECDatabaseHelper.class.getName(), "table service created");
            } catch (SQLException e) {
                    Log.e(ECDatabaseHelper.class.getName(), "Can't create database", e);
                    throw new RuntimeException(e);
            }

    }

Answer 1

我认为创建名为 libs 的文件夹的外部 Jar 存在问题，并将所有需要的 jar 文件复制并粘贴到该文件夹​​中，请参阅 this link做这个

为了保存图像，你需要在 ORMLite 中存储 byte[] 字段

@DatabaseField(dataType = DataType.BYTE_ARRAY)
byte[] imageBytes;

有关详细信息，请参阅 this link