Implement dragging to move profiles

src/main/scala/com/github/shadowsocks/database/DBHelper.scala

@@ -64,7 +64,7 @@ object DBHelper {
 }
 
 class DBHelper(val context: Context)
-  extends OrmLiteSqliteOpenHelper(context, DBHelper.PROFILE, null, 14) {
+  extends OrmLiteSqliteOpenHelper(context, DBHelper.PROFILE, null, 15) {
   import DBHelper._
 
   lazy val profileDao: Dao[Profile, Int] = getDao(classOf[Profile])
@@ -116,6 +116,15 @@ class DBHelper(val context: Context)
           profileDao.update(profile)
         }
       }
+      if (oldVersion < 15) {
+        profileDao.executeRawNoArgs("ALTER TABLE `profile` ADD COLUMN userOrder LONG;")
+        var i = 0
+        for (profile <- profileDao.queryForAll.asScala) {
+          profile.userOrder = i
+          profileDao.update(profile)
+          i += 1
+        }
+      }
     }
   }
 }

src/main/scala/com/github/shadowsocks/database/Profile.scala

@@ -92,4 +92,7 @@ class Profile {
 
   @DatabaseField
   val date: java.util.Date = new java.util.Date()
+
+  @DatabaseField
+  var userOrder: Long = _
 }

src/main/scala/com/github/shadowsocks/database/ProfileManager.scala

@@ -64,6 +64,9 @@ class ProfileManager(settings: SharedPreferences, dbHelper: DBHelper) {
           profile.udpdns = oldProfile.udpdns
         case _ =>
       }
+      val last = dbHelper.profileDao.queryRaw(dbHelper.profileDao.queryBuilder.selectRaw("MAX(userOrder)")
+        .prepareStatementString).getFirstResult
+      if (last != null && last.length == 1) profile.userOrder = last(0).toInt + 1
       dbHelper.profileDao.createOrUpdate(profile)
       if (profileAddedListener != null) profileAddedListener(profile)
       profile
@@ -109,10 +112,20 @@ class ProfileManager(settings: SharedPreferences, dbHelper: DBHelper) {
     }
   }
 
+  def getFirstProfile = {
+    try {
+      Option(dbHelper.profileDao.query(dbHelper.profileDao.queryBuilder.limit(1L).prepare).get(0))
+    } catch {
+      case ex: Exception =>
+        Log.e(Shadowsocks.TAG, "getAllProfiles", ex)
+        None
+    }
+  }
+
   def getAllProfiles: Option[List[Profile]] = {
     try {
       import scala.collection.JavaConversions._
-      Option(dbHelper.profileDao.queryForAll().toList)
+      Option(dbHelper.profileDao.query(dbHelper.profileDao.queryBuilder.orderBy("userOrder", true).prepare).toList)
     } catch {
       case ex: Exception =>
         Log.e(Shadowsocks.TAG, "getAllProfiles", ex)