Fix CustomInputType issue #1558

[vmadalin]

Description

#1558

Overview

By default the getDefaultSharedPreferences is used for set-up correctly the stored values like on sendDeviceInfoPrefix preference. But the problem starts when you want to work with different SharedPreferences in this case getSecretPrefs, and it's require to set it manually

[maniac103]

Thanks for this patch. I want to dig into this a bit more though, as it feels like a big shortcoming in the preference framework if this really is required, so @mueller-ma please hold off merging this for now.

[maniac103]

I'd expect the text to be loaded via [1], whose implementation is [2], which in turn is populated via [3], which is populated from [4]. The latter loads from data store (instead of shared prefs) if present, so IMHO we must be missing something here.

[1] https://android.googlesource.com/platform/frameworks/support/+/refs/heads/androidx-master-dev/preference/preference/src/main/java/androidx/preference/EditTextPreferenceDialogFragmentCompat.java#49
[2] https://android.googlesource.com/platform/frameworks/support/+/refs/heads/androidx-master-dev/preference/preference/src/main/java/androidx/preference/EditTextPreference.java#95
[3] https://android.googlesource.com/platform/frameworks/support/+/refs/heads/androidx-master-dev/preference/preference/src/main/java/androidx/preference/EditTextPreference.java#106
[4] https://android.googlesource.com/platform/frameworks/support/+/refs/heads/androidx-master-dev/preference/preference/src/main/java/androidx/preference/Preference.java#1676

[maniac103]

#1568 is my take on fixing this.

[vmadalin]

@maniac103 Absolutely agree with you, the approach is quite better and more clean. So strange behaviour and thank you for report issue to google. I close this PR