How to pass activity values to another activity (Kotlin)

I am a new learner for Kotlin and I am trying to make a setting activity for my app and I want this activity to pass it's values to other activities. I tried different codes but none of them works and I tried to make a shared preference file but I don't know how to write the code

to be clear, I want to pass the font types from setting [main] activity to another activity but i don't know how!

my Main Activity

val preferences = applicationContext.getSharedPreferences("MyPrefs", Context.MODE_PRIVATE)
val prefEditor = preferences.edit()

val fonts = arrayOf("Data1", "Data2", "Data3", "Data4")
val adapterCountry = ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, fonts)
val spinner = findViewById(R.id.spinner) as Spinner
spinner.adapter = adapterCountry
spinner.setSelection(preferences.getInt("position", 0))

spinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener

override fun onItemSelected(parent: AdapterView<*>, view: View, position: Int, id: Long)
spinner.setSelection(position)
prefEditor.putInt("position", position)
prefEditor.apply()
val selecteditem = parent.getItemAtPosition(position).toString()
if (selecteditem == "Data1")




override fun onNothingSelected(parent: AdapterView<*>)




and this is my main 2 activity:

class Main2Activity : AppCompatActivity() {

internal lateinit var sh : SharedPreferences
override fun onCreate(savedInstanceState: Bundle?)
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main2)

sh = PreferenceManager.getDefaultSharedPreferences(this)







override fun onStart()
super.onStart()
if (sh.getBoolean("positon", false))
when(sh.getInt("position", 0))
0->
t1.typeface = Typeface.createFromAsset(assets, "andlso.ttf")

1->
t1.typeface = Typeface.createFromAsset(assets, "frsspbl")








i found the solution of this question here it is
enter link description here

2 Answers
2

So basically you want to pass data (font type) in Int from an activity to another one. You can use SharedPrefenrences but it isn't recommended in Android.

Int

SharedPrefenrences

I give you 2 solutions:

1. Using bundle

MainActivity.kt

class MainActivity : AppCompatActivity()

override fun onCreate(savedInstanceState: Bundle?)
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)

val fonts = arrayOf("Data1", "Data2", "Data3", "Data4")
val adapterCountry = ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, fonts)
val spinner = findViewById(R.id.spinner) as Spinner
spinner.adapter = adapterCountry

spinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener

override fun onItemSelected(parent: AdapterView<*>, view: View, position: Int, id: Long)
spinner.setSelection(position)
val selecteditem = parent.getItemAtPosition(position).toString()
if (selecteditem == "Data1")



// Start another activity with position
val intent = Intent(this@MainActivity, Main2Activity::class.java)
intent.putExtra("position", position);
startActivity(intent)


override fun onNothingSelected(parent: AdapterView<*>)






Main2Activity.kt

class Main2Activity : AppCompatActivity()

override fun onCreate(savedInstanceState: Bundle?)
super.onCreate(savedInstanceState)

val position = intent.getIntExtra("position", 0)




2. Using SharedPreferences

MainActivity.kt

class MainActivity : AppCompatActivity()

override fun onCreate(savedInstanceState: Bundle?)
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)

val preferences = PreferenceManager.getDefaultSharedPreferences(this)

val fonts = arrayOf("Data1", "Data2", "Data3", "Data4")
val adapterCountry = ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, fonts)
val spinner = findViewById(R.id.spinner) as Spinner
spinner.adapter = adapterCountry
spinner.setSelection(preferences.getInt("position", 0))

spinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener

override fun onItemSelected(parent: AdapterView<*>, view: View, position: Int, id: Long)
spinner.setSelection(position)
val selecteditem = parent.getItemAtPosition(position).toString()
if (selecteditem == "Data1")



// Save position to prefs.
preferences.edit()
.putInt("position", position)
.apply()


override fun onNothingSelected(parent: AdapterView<*>)






Main2Activity.kt

class Main2Activity : AppCompatActivity()

override fun onCreate(savedInstanceState: Bundle?)
super.onCreate(savedInstanceState)

// Get position from prefs.
val position = PreferenceManager.getDefaultSharedPreferences(this).getInt("position", 0)




Intent has already existing functionality to send information from one activity to another.

Intent

// in your first activity:

val intent = Intent(context, Main2Activity::class.java)
.putExtra("position", position)
startActivity(intent)

// in your second activity, you can fetch the extras like this:

class Main2Activity : AppCompatActivity()

override fun onCreate(savedInstanceState: Bundle?)
super.onCreate(savedInstanceState)
val position = intent.getIntExtra("position", -1)





I don't recommend using shared preferences to pass events between screens because you can get stuck in awkward states if your app crashes before it can cleanup it's shared pref state.

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