Monday, June 17, 2019

Android Studio: Resolving PreferenceFragment is deprecated warning

I encountered the following warning message in Android Studio while converting some Android Java code to Kotlin:
'PreferenceFragment' is deprecated. Deprecated in Java

Some digging through the Android documentation resulted in a solution; the android.preference.PreferenceFragment class is being deprecated and can be replaced with the new Jetpack androidx preference classes. So I needed to do the following:
  1. Add a new dependency to the new Androidx preference library in the app's build.gradle file

    implementation "androidx.preference:preference:1.0.0"
  2. In the Kotlin source code, remove the following namespace import statement:

    import android.preference.PreferenceFragment
  3. Insert the following namespace import statement:

    import androidx.preference.PreferenceFragmentCompat
  4. Then override the abstract onCreatePreferences method.

override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
//        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
    }

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