Java Preference.setOnPreferenceChangeListener方法代码示例

import android.support.v7.preference.Preference; //导入方法依赖的package包/类
@Override
public void onCreatePreferences(Bundle bundle, String s) {

    // Add visualizer preferences, defined in the XML file in res->xml->pref_visualizer
    addPreferencesFromResource(R.xml.pref_visualizer);

    SharedPreferences sharedPreferences = getPreferenceScreen().getSharedPreferences();
    PreferenceScreen prefScreen = getPreferenceScreen();
    int count = prefScreen.getPreferenceCount();

    // Go through all of the preferences, and set up their preference summary.
    for (int i = 0; i < count; i++) {
        Preference p = prefScreen.getPreference(i);
        // You don't need to set up preference summaries for checkbox preferences because
        // they are already set up in xml using summaryOff and summary On
        if (!(p instanceof CheckBoxPreference)) {
            String value = sharedPreferences.getString(p.getKey(), "");
            setPreferenceSummary(p, value);
        }
    }
    // COMPLETED (3) Add the OnPreferenceChangeListener specifically to the EditTextPreference
    Preference preference = findPreference(getString(R.string.pref_size_key));
    preference.setOnPreferenceChangeListener(this);
}
 

import android.support.v7.preference.Preference; //导入方法依赖的package包/类
/**
 * Binds a preference's summary to its value. More specifically, when the
 * preference's value is changed, its summary (line of text below the
 * preference title) is updated to reflect the value. The summary is also
 * immediately updated upon calling this method. The exact display format is
 * dependent on the type of preference.
 *
 * @see #sBindPreferenceSummaryToValueListener
 */
private static void bindPreferenceSummaryToValue(Preference preference) {
    // Set the listener to watch for value changes.
    preference.setOnPreferenceChangeListener(sBindPreferenceSummaryToValueListener);

    // Trigger the listener immediately with the preference's
    // current value.
    final String key = preference.getKey();
    if (preference instanceof MultiSelectListPreference) {
        Set<String> summary = SharedPreferencesCompat.getStringSet(
                PreferenceManager.getDefaultSharedPreferences(preference.getContext()),
                key,
                new HashSet<>());
        sBindPreferenceSummaryToValueListener.onPreferenceChange(preference, summary);
    } else if (preference instanceof ColorPreference) {
        sBindPreferenceSummaryToValueListener.onPreferenceChange(preference, ((ColorPreference) preference).getColor());
    } else if (preference instanceof SeekBarPreference) {
        sBindPreferenceSummaryToValueListener.onPreferenceChange(preference, ((SeekBarPreference) preference).getValue());
    } else {
        String value = PreferenceManager
                .getDefaultSharedPreferences(preference.getContext())
                .getString(key, "");
        sBindPreferenceSummaryToValueListener.onPreferenceChange(preference, value);
    }
}
 

import android.support.v7.preference.Preference; //导入方法依赖的package包/类
@Override
public void onCreatePreferences(Bundle bundle, String s) {

    // Add visualizer preferences, defined in the XML file in res->xml->pref_visualizer
    addPreferencesFromResource(R.xml.pref_visualizer);

    SharedPreferences sharedPreferences = getPreferenceScreen().getSharedPreferences();
    PreferenceScreen prefScreen
            = getPreferenceScreen();
    int count = prefScreen.getPreferenceCount();

    // Go through all of the preferences, and set up their preference summary.
    for (int i = 0; i < count; i++) {
        Preference p = prefScreen.getPreference(i);
        // You don't need to set up preference summaries for checkbox preferences because
        // they are already set up in xml using summaryOff and summary On
        if (!(p instanceof CheckBoxPreference)) {
            String value = sharedPreferences.getString(p.getKey(), "");
            setPreferenceSummary(p, value);
        }
    }
    // TODO (3) Add the OnPreferenceChangeListener specifically to the EditTextPreference
    Preference preference = findPreference(getString(R.string.pref_size_key));
    preference.setOnPreferenceChangeListener(this);
}
 

import android.support.v7.preference.Preference; //导入方法依赖的package包/类
private static void bindPreferenceSummaryToValue(Preference preference) {
    // Set the listener to watch for value changes.
    preference.setOnPreferenceChangeListener(sBindPreferenceSummaryToValueListener);

    // Trigger the listener immediately with the preference's
    // current value.
    final String key = preference.getKey();
    if (preference instanceof MultiSelectListPreference) {
        Set<String> summary = SharedPreferencesCompat.getStringSet(
                PreferenceManager.getDefaultSharedPreferences(preference.getContext()),
                key, new HashSet<String>());
        sBindPreferenceSummaryToValueListener.onPreferenceChange(preference, summary);
    } else if (preference instanceof SeekBarPreference) {
        sBindPreferenceSummaryToValueListener.onPreferenceChange(preference, ((SeekBarPreference) preference).getValue());
    } else {
        String value = PreferenceManager
                .getDefaultSharedPreferences(preference.getContext())
                .getString(key, "");
        sBindPreferenceSummaryToValueListener.onPreferenceChange(preference, value);
    }
}
 

import android.support.v7.preference.Preference; //导入方法依赖的package包/类
/**
 * Init single Preference
 */
protected void initPrefsSummary(SharedPreferences sharedPreferences,
                                Preference p) {
    if (p instanceof PreferenceCategory) {
        PreferenceCategory pCat = (PreferenceCategory) p;
        int pcCatCount = pCat.getPreferenceCount();
        for (int i = 0; i < pcCatCount; i++) {
            initPrefsSummary(sharedPreferences, pCat.getPreference(i));
        }
    } else {
        updatePrefsSummary(sharedPreferences, p);
        if (p instanceof RingtonePreference) {
            p.setOnPreferenceChangeListener(new RingToneOnPreferenceChangeListener());
            mRingtonePreference = (RingtonePreference) p;
        }
    }
}
 

import android.support.v7.preference.Preference; //导入方法依赖的package包/类
@Override
public void onCreatePreferences(Bundle bundle, String s) {

    // Add preferences, defined in the XML file in res->xml->preferences.xml
    addPreferencesFromResource(R.xml.preferences);

    //set the summaries for the different preferences for the first time
    SharedPreferences sharedPreferences = getPreferenceScreen().getSharedPreferences();
    PreferenceScreen prefScreen = getPreferenceScreen();
    int count = prefScreen.getPreferenceCount();
    for (int i = 0; i < count; i++) {
        Preference p = prefScreen.getPreference(i);
        // You don't need to set up preference summaries for checkbox preferences because
        // they are already set up in xml using summaryOff and summary On
        if (!(p instanceof CheckBoxPreference) && !(p instanceof MultiSelectListPreference)) {
            String value = sharedPreferences.getString(p.getKey(), "");
            setPreferenceSummary(p, value);
        }
    }

    //attach listener to check for changes in the radius preference
    //because it should only contain only doubles and the code has to enforce this
    Preference preference = findPreference(getString(R.string.pref_radius_key));
    preference.setOnPreferenceChangeListener(this);
}
 

import android.support.v7.preference.Preference; //导入方法依赖的package包/类
public void invalidateSettings() {
    SwitchPreference dark = (SwitchPreference) findPreference("dark_theme");
    ExcludeFolderPreference exclude = (ExcludeFolderPreference) findPreference("excluded_folders_listener_key");
    ColorPickerPreference primary = (ColorPickerPreference) findPreference("primary");
    ColorPickerPreference accent = (ColorPickerPreference) findPreference("accent");
    Preference security = findPreference("security_placeholder");
    Preference animations = findPreference("animations");
    Preference staggered = findPreference("staggered");
    Preference cache = findPreference("clear_cache_placeholder");
    Preference sdcard = findPreference("externalsd_placeholder");
    Preference removesd = findPreference("removesd_placeholder");

    sdcard.setSummary(ExtSdHelper.getSdPath()==null ? getContext().getResources().getString(R.string.no_sd) : ExtSdHelper.getSdPath().substring(ExtSdHelper.getSdPath().lastIndexOf("/")+1));

    if (Build.VERSION.SDK_INT < 21) {
        sdcard.setEnabled(false);
    }

    removesd.setOnPreferenceClickListener(this);
    sdcard.setOnPreferenceClickListener(this);
    security.setOnPreferenceClickListener(this);
    exclude.setOnPreferenceClickListener(this);
    cache.setOnPreferenceClickListener(this);
    staggered.setOnPreferenceChangeListener(this);
    animations.setOnPreferenceChangeListener(this);
    dark.setOnPreferenceChangeListener(this);
    primary.setOnPreferenceChangeListener(this);
    accent.setOnPreferenceChangeListener(this);
}
 

import android.support.v7.preference.Preference; //导入方法依赖的package包/类
private void updatePreferenceSummaries() {
    Preference enableLocationTracking = findPreference(Common.PREF_ENABLE_LOCATION_TRACKING);
    enableLocationTracking.setOnPreferenceChangeListener((preference, newValue) -> {
        if (newValue == Boolean.TRUE && ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 0);
            return false;
        }
        updateLocationTracker();
        return true;
    });

    Preference deviceName = findPreference(Common.PREF_LOCATION_DEVICE_NAME);
    deviceName.setSummary(getResources().getString(R.string.preference_location_device_name_summary, prefs.getString(deviceName.getKey(), "nothing")));
    deviceName.setOnPreferenceChangeListener((preference, newValue) -> {
        preference.setSummary(getResources().getString(R.string.preference_location_device_name_summary, newValue));
        updateLocationTracker();
        return true;
    });

    Preference updateInterval = findPreference(Common.PREF_LOCATION_UPDATE_INTERVAL);
    int selectedIndex = Arrays.binarySearch(getResources().getIntArray(R.array.location_update_interval_values), prefs.getInt(updateInterval.getKey(), 10));
    updateInterval.setSummary(getResources().getStringArray(R.array.location_update_interval_summaries)[selectedIndex]);

    Preference resetIgnoredSSLMismatches = findPreference(Common.PREF_RESET_HOST_MISMATCHES);
    if (prefs.getStringSet(Common.PREF_ALLOWED_HOST_MISMATCHES_KEY, null) == null) {
        resetIgnoredSSLMismatches.setSummary(R.string.preference_reset_host_mismatches_summary_empty);
        resetIgnoredSSLMismatches.setEnabled(false);
    }
}
 

import android.support.v7.preference.Preference; //导入方法依赖的package包/类
private void bindPreferenceSummaryToValue(@NonNull Preference preference) {
    // Set the listener to watch for value changes.
    preference.setOnPreferenceChangeListener(listener);
    listener.onPreferenceChange(preference, mSetting.getValue(preference.getKey()));
}