Android-首选项API onSharedPreferenceChanged-哪种方法正确？

Question

I am using the Preferences-API to implement Settings into my App.
I have chosen to use a PreferenceFragment .

My PreferenceFragment contains my onSharedPreferenceChanged code.
However, for one of my Preferences , I'm not sure which way to go about achieving my goal.
The goal is: based on the TogglePreference, either enable or disable my Receiver.

Below, I have included the 2 different ways I thought to do it.
My reasoning for the two examples is #1 doesn't use findPreference(key) and #2 does.
So I am requesting feedback - which way is correct?

---

public static final String PREF_GPS_STATE_LISTENER = "pref_gpsStateListener";

private SharedPreferences.OnSharedPreferenceChangeListener prefChangeListener;
...
...

prefChangeListener = new SharedPreferences.OnSharedPreferenceChangeListener() {
    @Override
    public void onSharedPreferenceChanged
        (SharedPreferences sharedPreferences, String key) {

if (key.equals(PREF_GPS_STATE_LISTENER)) {

    final PackageManager pacMan = 
        getActivity().getApplicationContext().getPackageManager();
    final ComponentName compLocationReceiver = new ComponentName
        ("com.studio2bdesigns.testapp021019", ".LocationReceiver");
    final SharedPreferences getPrefs = 
        PreferenceManager.getDefaultSharedPreferences(getActivity());

    if (getPrefs.getBoolean(PREF_GPS_STATE_LISTENER, true)) {

        //  ENABLE THE RECEIVER
        pacMan.setComponentEnabledSetting(compLocationReceiver, 
        PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP);

    } else if (!getPrefs.getBoolean(PREF_GPS_STATE_LISTENER, true)) {

        //  DISABLE THE RECEIVER
        pacMan.setComponentEnabledSetting(compLocationReceiver, 
        PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);

    }
}
}

---

(OR) is this the correct way to do it :

---

private SharedPreferences.OnSharedPreferenceChangeListener prefChangeListener;
...
...

prefChangeListener = new SharedPreferences.OnSharedPreferenceChangeListener() {
    @Override
    public void onSharedPreferenceChanged
        (SharedPreferences sharedPreferences, String key) {

if (key.equals(PREF_GPS_STATE_LISTENER)) {

    Preference gpsStateListenerPref = findPreference(key);

    final PackageManager pacMan = 
        getActivity().getApplicationContext().getPackageManager();
    final ComponentName compLocationReceiver = new ComponentName
        ("com.studio2bdesigns.testapp021019", ".LocationReceiver");

    if (gpsStateListenerPref.isEnabled()) {

        //  ENABLE THE RECEIVER
        pacMan.setComponentEnabledSetting(compLocationReceiver, 
        PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP);

    } else if (!gpsStateListenerPref.isEnabled()) {

        //  DISABLE THE RECEIVER
        pacMan.setComponentEnabledSetting(compLocationReceiver, 
        PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);

    }
}
}

---

At first I thought Option #1 was correct - but the reason I came up with Option #2 is because the first example doesn't use findPreference(key); - which is the entire point of having key passed within onSharedPreferenceChanged isn't it?

Feedback on this is greatly appreciated! Thanks!

Answer 1

The key is used to match the visual control with shared preferences. This is really a matter for preference. I prefer to use number 1 since I am not dependent on a view, and makes shared preferences your source of truth.