NewsApp | 【资讯App】android 5.0风格的新闻客户端 -- -大面积使用材料设计风格；逐步完善中，包括文档；

it's the first time I'm using Loader. After calling the method

getLoaderManager().initLoader(0, null, this); I'm getting an error in the argument "this".

Error after compiling:

error: method initLoader in class LoaderManager cannot be applied to given types; getLoaderManager().initLoader(0, null, this); ^ required: int,Bundle,LoaderCallbacks found: int,,MainActivity reason: cannot infer type-variable(s) D (argument mismatch; MainActivity cannot be converted to LoaderCallbacks) where D is a type-variable: D extends Object declared in method initLoader(int,Bundle,LoaderCallbacks)

My code:

Faced an error in the onCreateOptionsMenu method during menu inflate. I do not understand why he refers to this field - it seems that I brought everything and did it correctly under androidx.

I'm working on a drawer layout. I want to replace the main activity screen with a fragment when I click a menu item, but it doesn't show a toolbar when I set the background of a fragment on some color app. Work done so far ...

I am getting the following errors when I try login to my app using firebase as well as the app crashing.

Main dart file actually i am creating the newsapp that get newsapi information using the json file but i cannot be able to show the data on th screen

Here I define stackview and a button. the properties of all buttons are the same.

I noticed that Topics CollectionViewCell was not gone when I debugged. Why is that? the cells are all correct but the collectionview is not available.

The link of the project is below. you can also look from there.

here I define cell.

I am following this tutorial by Raywenderlich on paging-library-for-android-with-kotlin on how to use android paging library. This is one of the easiest tutorials on the net and I have followed it thoroughly. However, I would like to make some changes so that I can intelligently switch between online data and offline data.

That is, I have old some posts in my database. Initially I have internet connection. So I load latest data from internet, then insert it into my database. Finally, I show this latest data in my recyclerView / PagedListAdapter. If for some reason, there is no internet connection after sometime, I should show the old posts from database.

How can I do this?

This is my code on github repository.

Here, I tried to create a factory pattern. It checks if initially I have internet, the factory returns pagedList from online dataSource. ELse, the factory returns pagedList from offline dataSource. But this doesnot intelligently switch between the 2 states.

I tried some random codes such as creating a boundary callback. But I am not sure how to make the necessary changes. I am not adding codes here (at least for now) to keep it short and precise.

Can anyone help me?

To be specific, I am loading paged data primarily from network. If there is a network error, I don't want to show the user an error. Instead I load paged data from cache / database and continuously show it to my user as long as possible. If the network is back,switch back to network paged data. (that's what instagram / facebook does I think). What is the appropriate way to implement this? See my code / attemp in the answer.

I am developing an app where I have a Json api and I need to populate it in recyclerview. Its a news api(not from newsapi.org). I am beginner to parsing json. However, I have tried to do but nothing came except an empty screen.

The Json api is https://earnezy.in/android_shop/newsapi2.php

I have attached the code.