여기 에 설명 된대로 PreferenceFragment를 서브 클래 싱하고 Activity 내부에 표시합니다. 이 문서는 여기 에서 환경 설정 변경을 수신하는 방법을 설명 하지만 PreferenceActivity를 하위 클래스로 만드는 경우에만 해당됩니다. 그렇게하지 않는데 선호도 변경을 어떻게 듣나요?
내 PreferenceFragment에서 OnSharedPreferenceChangeListener를 구현하려고 시도했지만 작동하지 않는 것 같습니다 ( onSharedPreferenceChanged
호출되지 않는 것 같습니다).
이것은 지금까지 내 코드입니다.
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>
또한 PreferenceFragment는 환경 설정 변경을 수신하기에 적합한 장소입니까, 아니면 Activity 내에서 수행해야합니까?
답변
난 당신이 바로 등록을 취소 / 등록 할 필요가 믿는 Listener
당신에 PreferenceFragment
그것은 작동합니다.
@Override
public void onResume() {
super.onResume();
getPreferenceManager().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
}
@Override
public void onPause() {
getPreferenceManager().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
super.onPause();
}
수행하려는 작업에 따라 리스너를 사용할 필요가 없을 수도 있습니다. 기본 설정 변경 사항은 SharedPreferences
자동으로 적용됩니다.
답변
antew의 솔루션은 잘 작동합니다. 여기에서 Android v11 이후의 전체 환경 설정 활동을 볼 수 있습니다.
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");
}
}
}
답변
다른 모든 답변은 정확합니다. 그러나 변경을 일으킨 Preference 인스턴스가 즉시 있기 때문에이 대안이 더 좋습니다.
@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;
}
});
}
답변
이것은 PreferenceFragment.onCreate ()에서 나를 위해 일했습니다.
OnSharedPreferenceChangeListener listener =
new SharedPreferences.OnSharedPreferenceChangeListener()
{
public void onSharedPreferenceChanged(SharedPreferences prefs, String key)
{
showDialog();
}
};
답변
다음은이를 수행하고 잠재적 인 메모리 누수를 방지하는 한 가지 방법입니다.
@Override
public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
addPreferencesFromResource(R.xml.pref_movies);
SharedPreferences sharedPreferences = getPreferenceScreen().getSharedPreferences();
//starts live change listener
sharedPreferences.registerOnSharedPreferenceChangeListener(this);
}
@Override
public void onDestroyView () {
super.onDestroyView();
//Unregisters listener here
PreferenceManager.getDefaultSharedPreferences(getContext())
.unregisterOnSharedPreferenceChangeListener(this);
}
답변
전체 그림을 볼 수있는 또 다른 완전한 예입니다.
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);
}
}
}
답변
나는 최근에를 PreferenceScreen
사용하여 내 자신의 것을 모으는 것을 마쳤 Preferences API
으므로 내 자신의 전체 예제를 기여할 것이라고 생각했습니다. 여기에는 Summary
변경 사항을 듣고 반응하는 것뿐만 아니라 새로운 / 변경된 값으로 업데이트하는 것이 포함 됩니다.
추신. 마지막 질문에 대답하려면 다음의 기본 값을 표시하려면 Summary
초기 생성시 PreferenceScreen
(이전 값의 변화에), 당신은 할 수 단순히 설정 android:summary
내에서, 사용자가 선택한 값에 preferences.xml
직접 파일 – 다음 번이 값이 변경 되면 아래 예제에 포함 된 코드를 사용하여 자동으로 업데이트됩니다. 개인적 으로의 Preference
이니셜로 의 간단한 설명을 사용합니다.Summary
, 내에서 설정 preferences.xml
한 다음 값 이 처음으로 변경되면 현재 값이 그 때 Summary
부터 표시 됩니다.
어쨌든 , 여기에 내 전체 예제 :
SettingsFragment.java가 있습니다.
public class SettingsFragment extends PreferenceFragment {
public static final String PREF_NOTIFICATION_MODE = "pref_notificationMode";
private SharedPreferences.OnSharedPreferenceChangeListener preferenceChangeListener;
@Override
public void onCreate (@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
final SharedPreferences getPrefs = PreferenceManager.getDefaultSharedPreferences(this.getActivity());
preferenceChangeListener = new SharedPreferences.OnSharedPreferenceChangeListener() {
@Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
if (key.equals(PREF_NOTIFICATION_MODE)) {
Preference notifModePref = findPreference(key);
notifModePref.setSummary(sharedPreferences.getString(key, ""));
// DO SOMETHING ELSE HERE WHEN (PREF_NOTIFICATION_MODE) IS CHANGED
}
}
};
}
@Override
public void onResume() {
super.onResume();
getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(preferenceChangeListener);
Preference notifModePref = findPreference(PREF_NOTIFICATION_MODE);
notifModePref.setSummary(getPreferenceScreen().getSharedPreferences().getString(PREF_NOTIFICATION_MODE, ""));
}
@Override
public void onPause() {
getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(preferenceChangeListener);
super.onPause();
}
}
이게 도움이 되길 바란다!
나는 StackOverflow를 처음 접했기 때문에 긍정적 인 피드백을 크게 높이 평가합니다.;)
행복한 코딩!