Orm Lite - 无法找到具有helper类的单个(Context)参数的公共构造函数

Question

我正在使用OrmLite 4.47.我遵循了许多教程,并在stackoverflow上阅读了其他问题,但我无法理解如何解决这个问题.

这是完整的信息

05-15 16:36:13.805: E/AndroidRuntime(15382): Caused by: java.lang.IllegalStateException: Could not find public constructor that has a single (Context) argument for helper class class com.j256.ormlite.android.apptools.OrmLiteSqliteOpenHelper
05-15 16:36:13.805: E/AndroidRuntime(15382): Caused by: java.lang.NoSuchMethodException: <init> [class android.content.Context]

那是我的databaseHelper类

public class MyDatabaseHelper extends OrmLiteSqliteOpenHelper {  

    // name of the database file for your application -- change to something  
    // appropriate for your app  
    private static final String DATABASE_NAME = "databas.db";  
    // any time you make changes to your database, you may have to increase the  
    // database version  
    private static final int DATABASE_VERSION = 1;  

    //genera molte eccezioni
    private Dao<Truck, Integer> truckDao = null;

    //genera una sola eccezione a runtime
    private RuntimeExceptionDao<Truck, Integer> truckRuntimeDao=null;

    public MyDatabaseHelper(Context context) { 
        super(context, DATABASE_NAME, null, DATABASE_VERSION); 

    } 

    @Override
    public void onCreate(SQLiteDatabase database, ConnectionSource connectionSource) {
        // TODO Auto-generated method stub
        try {
            TableUtils.clearTable(connectionSource, Truck.class);
        } catch (java.sql.SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    @Override
    public void onUpgrade(SQLiteDatabase database, ConnectionSource connectionSource, int OldVersion,
            int newVersion) {
        // TODO Auto-generated method stub
        try {
            TableUtils.dropTable(connectionSource, Truck.class, true);
            onCreate(database,connectionSource);
        } catch (java.sql.SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }  

    public Dao<Truck, Integer> getTruckDao() throws java.sql.SQLException{
        if(truckDao==null){
            truckDao=getDao(Truck.class);
        }
        return truckDao;
    }

    public RuntimeExceptionDao<Truck, Integer> getTruckRuntimeExceptionDao(){
        if(truckRuntimeDao==null){
            truckRuntimeDao=getRuntimeExceptionDao(Truck.class);
        }
        return truckRuntimeDao;
    }
}

当我尝试这样做时,我遇到了问题

MyDatabaseHelper helper = OpenHelperManager.getHelper(this,MyDatabaseHelper.class);
RuntimeExceptionDao<Truck, Integer> truckDao = helper.getTruckRuntimeExceptionDao();

因此数据库助手类是公共的,Activity类扩展了Activiy.

Answer 1

对于那些在启用minify(proguard)时遇到此错误的人:

为ormlite添加以下配置:

# ormlite
-keep class com.j256.**
-keepclassmembers class com.j256.** { *; }
-keep enum com.j256.**
-keepclassmembers enum com.j256.** { *; }
-keep interface com.j256.**
-keepclassmembers interface com.j256.** { *; }
-keepclassmembers class * {
  public <init>(android.content.Context);
}

另外检查一下Stackoverflow - proguard-with-ormlite-on-android

Answer 2

尝试清理项目......这很奇怪，因为代码看起来足够好工作:)