Initial stub migrate to androidx room

app/src/main/java/com/hippo/ehviewer/dao/DownloadDirname.java

@@ -1,33 +1,18 @@
 package com.hippo.ehviewer.dao;
 
-import org.greenrobot.greendao.annotation.*;
+import androidx.room.ColumnInfo;
+import androidx.room.Entity;
+import androidx.room.PrimaryKey;
 
-// THIS CODE IS GENERATED BY greenDAO, DO NOT EDIT. Enable "keep" sections if you want to edit.
-
-/**
- * Entity mapped to table "DOWNLOAD_DIRNAME".
- */
-@Entity(nameInDb = "DOWNLOAD_DIRNAME")
+@Entity(tableName = "DOWNLOAD_DIRNAME")
 public class DownloadDirname {
 
-    @Id
+    @PrimaryKey
+    @ColumnInfo(name = "GID")
     private long gid;
+    @ColumnInfo(name = "DIRNAME")
     private String dirname;
 
-    @Generated
-    public DownloadDirname() {
-    }
-
-    public DownloadDirname(long gid) {
-        this.gid = gid;
-    }
-
-    @Generated
-    public DownloadDirname(long gid, String dirname) {
-        this.gid = gid;
-        this.dirname = dirname;
-    }
-
     public long getGid() {
         return gid;
     }