Android-Live-Shared-Preferences-Git1

MainActivity.kt

class MainActivity : AppCompatActivity() {

    private val preferences = PreferenceManager.getDefaultSharedPreferences(this)

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

    var listener: SharedPreferences.OnSharedPreferenceChangeListener =
        SharedPreferences.OnSharedPreferenceChangeListener { _, key ->
            when (key) {
                "myKey1" ->
                "myKey2" ->
            }
        }

    override fun onResume() {
        super.onResume()
        preferences.registerOnSharedPreferenceChangeListener(listener)
    }

    override fun onPause() {
        super.onPause()
        preferences.unregisterOnSharedPreferenceChangeListener(listener)
    }
}