android

[Android] What is Android API level?

Introduction When I try to upload an app to Google Play Store, the following error occurs Your app is currently targeting API level 31....

[Android]Nothing is displayed in RecyclerView

Phenomenon When I try to read the data in the database and display it in RecyclerView, nothing is displayed. When I set a breakpoint and...

[Android]RecyclerView shows only one item

Phenomenon I want to read data from the database and display it in a list with RecyclerView. There should be more than one registered in...

[Android]SQLiteDataBase updates are not reflected in view

Phenomenon SQLiteDataBase is read by ContentProvider and listed in RecyclerView. Even if I update the contents of the database, it is not...

[Android] TextView is not centered horizontally when folded

Phenomenon I put a TextView inside the LinearLayout and set the gravity of the LinearLayout to center_horizontal. When the TextView has...

[Android] Want to save the contents of the view when switching pages with Bottom Navigation

Task I'm making an app that uses Android's Bottom Navigation. I want to save the data written in TextView etc. when I move the page and...