android वरीयता फ्रेगमेंट के भीतर वरीयता परिवर्तनों को कैसे सुनें?




android-fragments android-activity (4)

जैसा कि here वर्णित here , मैं वरीयता प्रारूप को उप-वर्गीकृत कर रहा हूं और इसे एक गतिविधि के अंदर प्रदर्शित कर रहा हूं। वह दस्तावेज़ बताता है कि here वरीयता परिवर्तनों को कैसे सुनना here , लेकिन केवल तभी जब आप वरीयता सक्रियता को उप-वर्गीकृत करते हैं। चूंकि मैं ऐसा नहीं कर रहा हूं, मैं वरीयता परिवर्तनों को कैसे सुनूं?

मैंने अपनी प्राथमिकताप्रदर्शन में OnSharedPreferenceChangeListener को कार्यान्वित करने का प्रयास किया है, लेकिन ऐसा लगता है कि यह काम नहीं कर रहा है ( onSharedPreferenceChanged कभी नहीं कहा जाता है)।

यह मेरा कोड अब तक है:

SettingsActivity.java

public class SettingsActivity extends Activity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        // Display the fragment as the main content.
        getFragmentManager().beginTransaction().replace(android.R.id.content, new SettingsFragment()).commit();
    }
}

SettingsFragment.java

public class SettingsFragment extends PreferenceFragment implements OnSharedPreferenceChangeListener
{
    public static final String KEY_PREF_EXERCISES = "pref_number_of_exercises";

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        // Load the preferences from an XML resource
        addPreferencesFromResource(R.xml.preferences);
    }

    @Override
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key)
    {
        //IT NEVER GETS IN HERE!
        if (key.equals(KEY_PREF_EXERCISES))
        {
            // Set summary to be the user-description for the selected value
            Preference exercisesPref = findPreference(key);
            exercisesPref.setSummary(sharedPreferences.getString(key, ""));
        }
    }
}

preferences.xml

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >

    <EditTextPreference
        android:defaultValue="15"
        android:enabled="true"
        android:key="pref_number_of_exercises"
        android:numeric="integer"
        android:title="Number of exercises" />

</PreferenceScreen>

साथ ही, वरीयता परिवर्तन भी वरीयता परिवर्तन सुनने के लिए सही जगह है या क्या मुझे गतिविधि के भीतर ऐसा करना चाहिए?


एंटीवा का समाधान अच्छी तरह से काम करता है, यहां आप Android v11 के लिए पूर्ण वरीयता गतिविधि देख सकते हैं:

import android.app.Activity;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.os.Bundle;
import android.preference.ListPreference;
import android.preference.PreferenceFragment;

public class UserPreferencesV11 extends Activity  {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Display the fragment as the main content.
    getFragmentManager().beginTransaction().replace(android.R.id.content,
            new PrefsFragment()).commit();
}

public static class PrefsFragment extends PreferenceFragment implements OnSharedPreferenceChangeListener {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Load the preferences from an XML resource
        addPreferencesFromResource(R.xml.preferences);

        // set texts correctly
        onSharedPreferenceChanged(null, "");

    }

    @Override
    public void onResume() {
        super.onResume();
        // Set up a listener whenever a key changes
        getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
    }

    @Override
    public void onPause() {
        super.onPause();
        // Set up a listener whenever a key changes
        getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
    }

    @Override
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
        // just update all
        ListPreference lp = (ListPreference) findPreference(PREF_YOUR_KEY);
        lp.setSummary("dummy"); // required or will not update
        lp.setSummary(getString(R.string.pref_yourKey) + ": %s");

    }
}
}

एक और पूरा उदाहरण है ताकि आप पूरी तस्वीर देखें।

public class SettingsActivity extends AppCompatPreferenceActivity {


    /**
     * A preference value change listener that updates the preference's summary
     * to reflect its new value.
     */
    private static Preference.OnPreferenceChangeListener
            sBindPreferenceSummaryToValueListener =
            new Preference.OnPreferenceChangeListener() {

                @Override
                public boolean onPreferenceChange(Preference preference, Object value) {
                    String stringValue = value.toString();

                    if (preference instanceof ListPreference) {
                        // For list preferences, look up the correct display value in
                        // the preference's 'entries' list.
                        ListPreference listPreference = (ListPreference) preference;
                        int index = listPreference.findIndexOfValue(stringValue);

                        // Set the summary to reflect the new value.
                        preference.setSummary(
                                index >= 0
                                        ? listPreference.getEntries()[index]
                                        : null);

                    } else if (preference instanceof RingtonePreference) {
                        // For ringtone preferences, look up the correct display value
                        // using RingtoneManager.
                        if (TextUtils.isEmpty(stringValue)) {
                            // Empty values correspond to 'silent' (no ringtone).
                            preference.setSummary(R.string.pref_ringtone_silent);
                        } else {
                            Ringtone ringtone = RingtoneManager.getRingtone(
                                    preference.getContext(), Uri.parse(stringValue));
                            if (ringtone == null) {
                                // Clear the summary if there was a lookup error.
                                preference.setSummary(null);
                            } else {
                                // Set the summary to reflect the new ringtone display
                                // name.
                                String name = ringtone.getTitle(preference.getContext());
                                preference.setSummary(name);
                            }
                        }

                    } else {
                        // For all other preferences, set the summary to the value's
                        // simple string representation.
                        preference.setSummary(stringValue);
                    }
                    return true;
                }
            };

    /**
     * Helper method to determine if the device has an extra-large screen. For
     * example, 10" tablets are extra-large.
     */
    private static boolean isXLargeTablet(Context context) {
        return (context.getResources().getConfiguration().screenLayout
                & Configuration.SCREENLAYOUT_SIZE_MASK) >= Configuration.SCREENLAYOUT_SIZE_XLARGE;
    }

    /**
     * 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.
        sBindPreferenceSummaryToValueListener.onPreferenceChange(preference,
                PreferenceManager
                        .getDefaultSharedPreferences(preference.getContext())
                        .getString(preference.getKey(), ""));
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setupActionBar();
    }

    /**
     * Set up the {@link android.app.ActionBar}, if the API is available.
     */
    private void setupActionBar() {
        ActionBar actionBar = getSupportActionBar();
        if (actionBar != null) {
            // Show the Up button in the action bar.
            actionBar.setDisplayHomeAsUpEnabled(true);
        }
    }

    @Override
    public boolean onMenuItemSelected(int featureId, MenuItem item) {
        int id = item.getItemId();
        if (id == android.R.id.home) {
            if (!super.onMenuItemSelected(featureId, item)) {
                NavUtils.navigateUpFromSameTask(this);
            }
            return true;
        }
        return super.onMenuItemSelected(featureId, item);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean onIsMultiPane() {
        return isXLargeTablet(this);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    public void onBuildHeaders(List<Header> target) {
        loadHeadersFromResource(R.xml.pref_headers, target);
    }

    /**
     * This method stops fragment injection in malicious applications.
     * Make sure to deny any unknown fragments here.
     */
    protected boolean isValidFragment(String fragmentName) {
        return PreferenceFragment.class.getName().equals(fragmentName)
                || GPSLocationPreferenceFragment.class.getName().equals(fragmentName)
                || DataSyncPreferenceFragment.class.getName().equals(fragmentName)
                || NotificationPreferenceFragment.class.getName().equals(fragmentName);
    }

    ////////////////// NEW PREFERENCES ////////////////////////////

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    public static class GPSLocationPreferenceFragment extends PreferenceFragment {

        Preference prefGPSServerAddr, prefGPSASDID, prefIsGPSSwitch;

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            addPreferencesFromResource(R.xml.pref_gps_location);
            setHasOptionsMenu(true);

            // Bind the summaries of EditText/List/Dialog/Ringtone preferences
            // to their values. When their values change, their summaries are
            // updated to reflect the new value, per the Android Design
            // guidelines.

            bindPreferenceSummaryToValue(findPreference("gpsServer_Addr"));
            bindPreferenceSummaryToValue(findPreference("gpsASD_ID"));


            prefGPSServerAddr = findPreference("gpsServer_Addr");
            prefGPSServerAddr.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
                @Override
                public boolean onPreferenceChange(Preference preference, Object newValue) {

                    try {
                        // do whatever you want with new value

                    }
                    catch (Exception ex)
                    {
                        Log.e("Preferences", ex.getMessage());
                    }

                    // true to update the state of the Preference with the new value
                    // in case you want to disallow the change return false
                    return true;
                }
            });

            prefGPSASDID = findPreference("gpsASD_ID");
            prefGPSASDID.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
                @Override
                public boolean onPreferenceChange(Preference preference, Object newValue) {

                    try {
                        // do whatever you want with new value

                    }
                    catch (Exception ex)
                    {
                        Log.e("Preferences", ex.getMessage());
                    }

                    // true to update the state of the Preference with the new value
                    // in case you want to disallow the change return false
                    return true;
                }
            });

            prefIsGPSSwitch = findPreference("isGPS_Switch");
            prefIsGPSSwitch.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
                @Override
                public boolean onPreferenceChange(Preference preference, Object newValue) {

                    try {
                        // do whatever you want with new value

                    }
                    catch (Exception ex)
                    {
                        Log.e("Preferences", ex.getMessage());
                    }

                    // true to update the state of the Preference with the new value
                    // in case you want to disallow the change return false
                    return true;
                }
            });
        }

        @Override
        public boolean onOptionsItemSelected(MenuItem item) {
            int id = item.getItemId();
            if (id == android.R.id.home) {
                boolean tabletSize = getResources().getBoolean(R.bool.isTablet);
                if (tabletSize) {
                    startActivity(new Intent(getActivity(), MainActivity.class));
                } else {
                    startActivity(new Intent(getActivity(), SettingsActivity.class));
                }
                return true;
            }
            return super.onOptionsItemSelected(item);
        }
    }

    ///////////////////////////////////////////////////////////////

    /**
     * This fragment shows notification preferences only. It is used when the
     * activity is showing a two-pane settings UI.
     */
    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    public static class NotificationPreferenceFragment extends PreferenceFragment {
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            addPreferencesFromResource(R.xml.pref_notification);
            setHasOptionsMenu(true);

            // Bind the summaries of EditText/List/Dialog/Ringtone preferences
            // to their values. When their values change, their summaries are
            // updated to reflect the new value, per the Android Design
            // guidelines.
            bindPreferenceSummaryToValue(findPreference("notifications_new_message_ringtone"));
        }

        @Override
        public boolean onOptionsItemSelected(MenuItem item) {
            int id = item.getItemId();
            if (id == android.R.id.home) {
                boolean tabletSize = getResources().getBoolean(R.bool.isTablet);
                if (tabletSize) {
                    startActivity(new Intent(getActivity(), MainActivity.class));
                } else {
                    startActivity(new Intent(getActivity(), SettingsActivity.class));
                }
                return true;
            }
            return super.onOptionsItemSelected(item);
        }
    }

    /**
     * This fragment shows data and sync preferences only. It is used when the
     * activity is showing a two-pane settings UI.
     */
    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    public static class DataSyncPreferenceFragment extends PreferenceFragment {
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            addPreferencesFromResource(R.xml.pref_data_sync);
            setHasOptionsMenu(true);

            // Bind the summaries of EditText/List/Dialog/Ringtone preferences
            // to their values. When their values change, their summaries are
            // updated to reflect the new value, per the Android Design
            // guidelines.
            bindPreferenceSummaryToValue(findPreference("sync_frequency"));
        }

        @Override
        public boolean onOptionsItemSelected(MenuItem item) {
            int id = item.getItemId();
            if (id == android.R.id.home) {
                boolean tabletSize = getResources().getBoolean(R.bool.isTablet);
                if (tabletSize) {
                    startActivity(new Intent(getActivity(), MainActivity.class));
                } else {
                    startActivity(new Intent(getActivity(), SettingsActivity.class));
                }
                return true;
            }
            return super.onOptionsItemSelected(item);
        }
    }
}

यह मेरे लिए वरीयता फ्रेगमेंट.ऑनक्रेट () से काम करता है

OnSharedPreferenceChangeListener listener = 
    new SharedPreferences.OnSharedPreferenceChangeListener()
    {
        public void onSharedPreferenceChanged(SharedPreferences prefs, String key)
        {
         showDialog();
        }
    };

अन्य सभी उत्तर सही हैं। लेकिन मुझे यह विकल्प बेहतर पसंद है क्योंकि आपके पास तुरंत वरीयता उदाहरण है जिसके कारण परिवर्तन हुआ।

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Preference pref = findPreference(getString(R.string.key_of_pref));        
    pref.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
        @Override
        public boolean onPreferenceChange(Preference preference, Object newValue) {
            // do whatever you want with new value

            // true to update the state of the Preference with the new value
            // in case you want to disallow the change return false
            return true;
        }
    });
}




android-preferences