How to get font size from shared preference to textView in recyclerView?-CodePudding

I have two recyclerView Parent and Child, and in Settings I changed font size, and in SaveData Class I saved this size. How to get font size from shared preference in Settings to section (Title Section) and items (Text Items)?

this is the Code:

1. in Parent Adapter:
override fun onBindViewHolder(holder: ParentAdapter.MyViewHolder, position: Int) {
        holder.viewDataBinding.section.text = list[position].section
        holder.viewDataBinding.childRv.apply {
            adapter = ChildAdapter(list[position].list)
        }
}

2. in Child Adapter:
override fun onBindViewHolder(holder: ChildAdapter.MyViewHolder, position: Int) {
        holder.viewDataBinding.childText.text = list[position]
}

3. in Activity:
override fun onCreate(savedInstanceState: Bundle?) {
val mainBinding = binding.mainRecycler
        mainBinding.apply {
            layoutManager = LinearLayoutManager(this@Activity)
            adapter = ParentAdapter(list)
        }
}

4. in SaveData Class:
class SaveData(context: Context) {
    private val sharedPreferences: SharedPreferences =
        context.getSharedPreferences("file", Context.MODE_PRIVATE)

fun setFontSize(size: Float?) {
        val editor = sharedPreferences.edit()
        editor.putFloat("FontSize", size!!)
        editor.apply()
    }

    fun loadFontSize(): Float {
        val size = sharedPreferences.getFloat("FontSize", 0f)
        return size
    }
}

CodePudding user response：

You can use SharedPreferences.OnSharedPreferenceChangeListener and get font when it is changed.

CodePudding user response：

The correct way to change font size is via the Preference Library to create a settings screen and then create a custom attribute. And create different styles depending on each size.

You can read my Medium Article for a step by step guide.