[ADD] loaders and fileio read

app/src/main/java/com/a1/nextlocation/data/FileIO.java

@@ -4,6 +4,7 @@ import android.content.Context;
 import android.content.res.AssetManager;
 
 import com.google.gson.Gson;
+import com.google.gson.reflect.TypeToken;
 
 import java.io.IOException;
 import java.io.InputStream;
@@ -14,21 +15,20 @@ import java.nio.file.Paths;
 
 public class FileIO<T> {
 
-    private Class<T> tClass;
-
 
     public Class<T> readFileData(Context context, String fileName) {
         Gson gson = new Gson();
         AssetManager am = context.getAssets();
+        Class<T> res = null;
         try {
             InputStream is = am.open(fileName);
             InputStreamReader inputStreamReader = new InputStreamReader(is);
-            T res = gson.fromJson(inputStreamReader,);
+            res = gson.fromJson(inputStreamReader,new TypeToken<T>(){}.getType());
+
         } catch (IOException e) {
             e.printStackTrace();
         }
-        //TODO make
-        return null;
+        return res;
     }
 
     public void writeFileData(T objectToWrite) {