ARecyclerView | 一个库搞定recyclerview -
kandi X-RAY | ARecyclerView Summary
kandi X-RAY | ARecyclerView Summary
一个库搞定recyclerview
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Top functions reviewed by kandi - BETA
- Initializes the Activity
- Remove foot view
- Set layout manager
- Initialize view adapter
- Obtains the bounds for a divider
- Calculates the divider for a given position
- Sets the adapter
- Called when load is complete
- Helper method to calculate the bounds for a divider
- Calculates the size of the divider based on a specific position
- Inflate the recyclerView
- Gets the position of the first visible item in a RecyclerViewManager
- Set span size lookup
- Remove header view from header list
- Set a horizontal layout manager for the view
- Creates a clone object
- On load finish
- Removes an element
- Gets the item type of a specific item
- Set the base adapter
- Invoked when the view is created
- Called when the view is clicked
- Initializes the View
- Sets the scrollbar attributes
- Helper method to draw on RecyclerView
- Set a vertical divider with a specific color
ARecyclerView Key Features
ARecyclerView Examples and Code Snippets
Community Discussions
Trending Discussions on ARecyclerView
QUESTION
I am currently working on an app that needs to observe changes for one entry in my database. The app is structured like this: My MainActivity is aRecyclerView listing all friends in DB. When clicking an item/friend the friend's profile (ProfileActivity) is started including a button to open an editor to edit name, birthday, image etc. When the user is done editing the new data is saved to the DB and the EditActivity is closed and the app returns to ProfileActivity. Here I want the changed to be displayed.
I experimented with both LiveData and MutableLiveData. I used the common structure of Activity-ViewModel-Repository-Dao in both cases. With LiveData my Dao.findBy(friendId) returns LiveData and with MutableLiveData Dao.findBy(friendId) returns FriendEntity. The problem with MutableLiveData is that changes in the DB cannot be observed directly. And with LiveData the problem is, that is have to somehow initialize the LiveData field in my Repository for the Activity to observe it. But LiveData cannot be manually initialized - so I get a NullPointerException.
I tried calling Dao.findBy(-1) at onCreate to have my LiveData initialized, and as soon as I know the actual friendId I call it again, but onChanged is not triggered anymore.
Is there a good solution to that problem? Is there another way to initialize LiveData? Why is onChanged not triggered the second time I call Dao.findBy(friendId) (after having called Dao.findBy(-1))
Activity:
...ANSWER
Answered 2020-Jun-16 at 23:28Why is onChanged not triggered the second time I call Dao.findBy(friendId) (after having called Dao.findBy(-1))
In your repository, you are initializing your database hook with id = -1L
. Now you will only recieve update for entities with id=-1 then. And ID fields are almost always the ROWID of databases, which are never negative.
SOLUTION: Now, what I understand from your question is you will have one and only one entry in your DBase table. This means that the value you expect does not (and therefore cannot)depend on any parameter. That is straightforward to implement:
Since you will have only one entry which cannot depend any parameter, you do not actually need any parameters for your function findBy(long id)
. Just remove WHERE clause from your query:
QUESTION
Hi I create arecyclerview apps. when I click an item it shows text and image but I want to add r.raw.b mp3 file as a third item. How could I do it? here is detailed activity. How Could I change them? if anyone help, thanks alot..
...ANSWER
Answered 2018-Jan-22 at 11:49public class PlaylistActivity extends AppCompatActivity {
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install ARecyclerView
You can use ARecyclerView like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the ARecyclerView component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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