使用偏好设置在运行时更改语言[android] [英] Changing language in run time with Preferences [android]
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问题描述
为此，我读了几次官方指南，并且许多其他内容，例如本网站上的问题，但我无法100％完成我的工作
I read a few times the official guide for this, and many other stuff, like questions on this site but I cant make mine work 100%
截至目前，如果我在列表首选项中更改语言，则活动(SettingsActivity)不会自动更新(例如20次中的1次，某种程度上它会更新，不知道为什么).当我按下后退按钮后，我的MainActivity也没有更新.但是我所有其他活动始终显示正确的语言，并且如果我重新启动该应用程序，则可以回到SettingsActivity，与MainActivity一样，也可以.
As of right now if I change the language in my list preference, the activity (SettingsActivity) will not update itself (like 1 out of 20 times, somehow it will, no idea why). After I press the back button, my MainActivity did not update either. But all my other activitys always show the correct language, and if I go back to the SettingsActivity it will be okay, same with the MainActivity, if I restart the app.
相关部分:
MainActivity:
public class MainActivity extends Activity {
public static final String KEY_PREF_LANGUAGE = "pref_language";
@Override
protected void onCreate(Bundle savedInstanceState) {
...
PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
}
@Override
protected void onResume() {
super.onResume();
SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
String languagePref_ID = sharedPref.getString(KEY_PREF_LANGUAGE, "2");
switch (languagePref_ID) {
case "1":
Locale localeEN = new Locale("en_US");
setLocale(localeEN);
break;
case "2":
Locale localeHU = new Locale("hu_HU");
setLocale(localeHU);
break;
}
}
public void setLocale(Locale locale) {
Locale.setDefault(locale);
Resources res = getResources();
DisplayMetrics dm = res.getDisplayMetrics();
Configuration conf = res.getConfiguration();
conf.locale = locale;
res.updateConfiguration(conf, dm);
//recreate();
//finish();
//startActivity(getIntent());
//if these are not commented, main activity wont show at start at all
}
SettingsActivity
public class SettingsActivity extends PreferenceActivity implements SharedPreferences.OnSharedPreferenceChangeListener {
public static final String KEY_PREF_LANGUAGE = "pref_language";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getFragmentManager().beginTransaction()
.replace(android.R.id.content, new SettingsFragment())
.commit();
SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.OnSharedPreferenceChangeListener listener =
new SharedPreferences.OnSharedPreferenceChangeListener() {
public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
if (key.equals(KEY_PREF_LANGUAGE)) {
String languagePref_ID = prefs.getString(SettingsActivity.KEY_PREF_LANGUAGE, "");
switch (languagePref_ID) {
case "1":
Locale localeEN = new Locale("en_US");
setLocale(localeEN);
break;
case "2":
Locale localeHU = new Locale("hu_HU");
setLocale(localeHU);
break;
}
}
}
};
sharedPref.registerOnSharedPreferenceChangeListener(listener);
}
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
if (key.equals(KEY_PREF_LANGUAGE)) {
String languagePref_ID = sharedPreferences.getString(SettingsActivity.KEY_PREF_LANGUAGE, "2");
switch (languagePref_ID) {
case "1":
Locale localeEN = new Locale("en_US");
setLocale(localeEN);
break;
case "2":
Locale localeHU = new Locale("hu_HU");
setLocale(localeHU);
break;
}
}
//this doenst even get called but i need it for the implementation
}
public void setLocale(Locale locale) {
Locale.setDefault(locale);
Resources res = getResources();
DisplayMetrics dm = res.getDisplayMetrics();
Configuration conf = res.getConfiguration();
conf.locale = locale;
res.updateConfiguration(conf, dm);
recreate(); //tried like 4 ways to do this, nothing really worked
//finish();
//startActivity(getIntent());
}
}
SettingsFragment.java
public class SettingsFragment extends PreferenceFragment {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Load the preferences from an XML resource
addPreferencesFromResource(R.xml.preferences);
}
}
AndroidManifest.xml
android:configChanges="locale|orientation" //added to main and settings activity
我为此感到疯狂，这是最佳的工作状态，但是我知道这里的活动生命周期管理远非最佳，当我尝试使用这些工具时，我通常无法正常工作.我该如何进行这项工作，使其实际上在所有活动的运行时更新?
I'm getting crazy over this, this is the best working state, but I know the activity lifecyle managment here is far from the best, when I try with those, I can't get it to work at all usually. How can I make this work so it actually updates on run time on all activities?
推荐答案
最后，我使它无需使用片段即可工作.因此，这里有一些不推荐使用的方法，我也尝试了使用片段，但是还没有完整的成功.这段代码总是在更改后刷新SettingsActivity，而MainActivity本身更新得太正确了.
In the end I made it work without the use of fragments. So there are some deprecated methods in here, I tried with fragments too, but no full succes (yet). This code refreshes SettingsActivity after a change always, and MainActivity updates itself too correctly.
MainActivity
public class MainActivity extends Activity {
public static final String KEY_PREF_LANGUAGE = "pref_language";
public String languagePref_ID;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
languagePref_ID = sharedPref.getString(KEY_PREF_LANGUAGE, "2");
switch (languagePref_ID) {
case "1":
Locale localeEN = new Locale("en_US");
setLocaleOnCreate(localeEN);
break;
case "2":
Locale localeHU = new Locale("hu_HU");
setLocaleOnCreate(localeHU);
break;
}
setContentView(R.layout.activity_main);
....
}
@Override
protected void onResume() {
super.onResume();
SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
String languagePref_ID_RES = sharedPref.getString(KEY_PREF_LANGUAGE, "2");
if(!languagePref_ID.equals(languagePref_ID_RES)){
languagePref_ID_RES = languagePref_ID;
switch (languagePref_ID_RES) {
case "1":
Locale localeEN = new Locale("en_US");
setLocale(localeEN);
break;
case "2":
Locale localeHU = new Locale("hu_HU");
setLocale(localeHU);
break;
}
}
}
public void setLocaleOnCreate(Locale locale) {
Locale.setDefault(locale);
Resources res = getResources();
DisplayMetrics dm = res.getDisplayMetrics();
Configuration conf = res.getConfiguration();
conf.locale = locale;
res.updateConfiguration(conf, dm);
}
public void setLocale(Locale locale) {
Locale.setDefault(locale);
Resources res = getResources();
DisplayMetrics dm = res.getDisplayMetrics();
Configuration conf = res.getConfiguration();
conf.locale = locale;
res.updateConfiguration(conf, dm);
recreate();
//finish();
//startActivity(getIntent());
}
....
public void startSettingsActivity(View view) {
Intent intent = new Intent(this, SettingsActivity.class);
startActivity(intent);
}
}
SettingsActivity
public class SettingsActivity extends PreferenceActivity implements SharedPreferences.OnSharedPreferenceChangeListener {
public static final String KEY_PREF_LANGUAGE = "pref_language";
public String languagePref_ID;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.OnSharedPreferenceChangeListener listener =
new SharedPreferences.OnSharedPreferenceChangeListener() {
public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
if (key.equals(KEY_PREF_LANGUAGE)) {
languagePref_ID = prefs.getString(SettingsActivity.KEY_PREF_LANGUAGE, "2");
switch (languagePref_ID) {
case "1":
Locale localeEN = new Locale("en_US");
setLocale(localeEN);
break;
case "2":
Locale localeHU = new Locale("hu_HU");
setLocale(localeHU);
break;
}
}
}
};
sharedPref.registerOnSharedPreferenceChangeListener(listener);
addPreferencesFromResource(R.xml.preferences);
}
@Override
protected void onResume() {
super.onResume();
getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
}
@Override
protected void onPause() {
super.onPause();
getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
}
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
if (key.equals(KEY_PREF_LANGUAGE)) {
languagePref_ID = sharedPreferences.getString(SettingsActivity.KEY_PREF_LANGUAGE, "2");
switch (languagePref_ID) {
case "1":
Locale localeEN = new Locale("en_US");
setLocale(localeEN);
break;
case "2":
Locale localeHU = new Locale("hu_HU");
setLocale(localeHU);
break;
}
}
}
public void setLocale(Locale locale) {
Locale.setDefault(locale);
Resources res = getResources();
DisplayMetrics dm = res.getDisplayMetrics();
Configuration conf = res.getConfiguration();
conf.locale = locale;
res.updateConfiguration(conf, dm);
recreate();
}
}
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