How to Secure Android Shared Preferences?

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UPDATED ANSWER:

Android has released a security library with EncryptedSharedPreferences in their Jetpack library.

Edit: With version v1.1.0 you can support Lollipop (API level 21) and above

String masterKeyAlias = MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC);

SharedPreferences sharedPreferences = EncryptedSharedPreferences.create(
    "secret_shared_prefs",
    masterKeyAlias,
    context,
    EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
    EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
);

// use the shared preferences and editor as you normally would
SharedPreferences.Editor editor = sharedPreferences.edit();

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