ListString到带有GSON-TypeToken的string

Question

我试图在Android应用程序中解析一个JSON数组，其中包含一些URL以加载到我的SQLite数据库中，下面是代码：

JSONArray pics = json.getJSONArray("bilder");
Gson gson = new Gson();
String obj = gson.toJson(pics);
String SQLiteDataBaseQuery = "INSERT INTO images_table (id,desc,imgurl) VALUES('"+i+"', '"+jr_desc+"', '"+obj+"');";
sqLiteDatabase.execSQL(SQLiteDataBaseQuery);

所以，现在我想从我的DB中调用信息：

Cursor cursor;
Array_links = new ArrayList<String>();
SQLiteGallery sqLiteHelper;
SQLiteDatabase sqLiteDatabase;
sqLiteHelper = new SQLiteGallery(this);
sqLiteDatabase = sqLiteHelper.getWritableDatabase();
cursor = sqLiteDatabase.rawQuery("SELECT * FROM "+SQLiteGallery.TAB_NAME+"", null);
cursor.moveToPosition(0);
Array_links.add(cursor.getString(cursor.getColumnIndex(SQLiteGallery.table_imgurl)));
Gson gson = new Gson();
Type type = new TypeToken<List<String>>().getType();
List<String> img_urls = gson.fromJson(Array_links,type);
for(String url : img_urls)
{
    System.out.println(url);
}

Android Studio给我的错误如下：

TypeToken在“com.google.gson.reflect.TypeToken”中具有受保护的访问权限

     Cursor cursor;
     String urls;
     SQLiteGallery sqLiteHelper;
     SQLiteDatabase sqLiteDatabase;
     sqLiteHelper = new SQLiteGallery(this);
     sqLiteDatabase = sqLiteHelper.getWritableDatabase();
     cursor = sqLiteDatabase.rawQuery("SELECT * FROM 
     "+SQLiteGallery.TAB_NAME+"", null);
     cursor.moveToPosition(0);
     urls = 
     cursor.getString(cursor.getColumnIndex(SQLiteGallery.table_imgurl));
     Gson gson = new Gson();
     Type type = new TypeToken<List<String>>(){}.getType();
     List<String> img_urls = gson.fromJson(urls,type);
     for(String url : img_urls)
     {
     System.out.println(url);
     }

Answer 1

您忘记了{}，您的代码是：

Type type = new TypeToken<List<String>>().getType();

应该是：

Type type = new TypeToken<List<String>>(){}.getType();