Effect on performance by parameter passing on flutter app - android

I am passing some parameters to the child widget which can be fetched by child widget also from database. What is effect of parameter passing in flutter widgets. For example List<Map<String, dynamic>> where list has 30 elements and map contains 8 entries. Which method will make my app smoother? Should I fetch data from sqlite database or should I pass it from parent to child widget?
Thanks in advance.

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Items with dynamic content in a listview

I'm pretty new to Android and I have a question about an application that I'm trying to develop.
My problem is about listview and adapter: I have a list of objects that contain information about a user's favorite routes (i created an object FavouriteRoute and i pass an ArrayList to the BaseAdapter). However, each object can contain a variable number of cities, of stops and days of the week ... how do I handle this dynamic content and show it inside of each row of listview? What's the best approach? I have to manage these elements within the getView () of the adapter and insert them dynamically within the layout of each row?
You can take the reference of these tutorials to learn creating your adapter which will server your purpose.
http://androidexample.com/How_To_Create_A_Custom_Listview_-_Android_Example/index.php?view=article_discription&aid=67&aaid=92
https://www.caveofprogramming.com/guest-posts/custom-listview-with-imageview-and-textview-in-android.html
http://www.androidhive.info/2014/07/android-custom-listview-with-image-and-text-using-volley/
If you want that some of your views are visible and some are not then in getView() do this:
if(your condition)
textView.setVisibility(View.GONE);
after inflating the views.

Android Dynamic GridView updates within seconds

I want to create a dashboard wherein I want to populate some data in a GridView in android. For example,
Activity - GridView in which there are two columns.
Each grid is Header Text and Result Text.
Now I want to update only Result Text with time as I am fetching it from database and updating the values in real time.
Keeping my Header and whole view intact.
Can anyone suggest any quick way to do so...??
You only need to update the underlying data of the adapter and call notifyDataSetChanged() so the adapter knows the data was changed.

Android get the values of dynamically created items

I am creating views like EditText,RadioButtons checkBoxes etc. dynamically as per the response from web service. Now, I need to get the values of all created views in single HashMap or any Map. How can I do that?
you can use the View.getId() function for that

Dynamic ExpandableList Android - Populated with values from Web

I am looking to create an Expandable List with values that I am receiving during a AsyncTask. Is it possible that I can put theses values in a list?
The list will be displayed in another view once a user presses a button.
Would it be similar to setting the text for a string? (Using .setText)
Android.
Get the values from the Async task and put them in an array.
And set the Adapter of the list to this array.
The values will be displayed via the getChildView().

How do I show Paging in a dynamic tablelayout?

In my application I am getting data from server and showing it using a table layout some times I am getting a data of atleast 20 to 30 rows but I want to show 4 rows at a time and then I want to show another 4 etc.
For this I want to know how can we use paging (Previous/Next) in Android if it's not possible with tablelayout can any one suggest which field can give that facility I aleady tried with GridView also but no luck
You can try this way ...
Store parsed data in List(or whatever) and create a method say createRows() which takes list as its argument and using list create rows.
So from your main list (parsed data list) create a sublist of size 4 and pass it to method. So initially it will create table with 4 row (as your requirement).
And on your next button first remove table's current rows using removeAllViews() method and then extract another sublist containing next 4 data to be shown & again pass it to createRows() method.So now it will create table with new data.
Same thing can be applied to previous button.
you can do it with fragments, there will be two fragments one will contain buttons(prev/next) or other fixed position data. and the other fragment will dynamically load data on request of button if you can program it.

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