我读了几遍官方指南 http://developer.android.com/guide/topics/ui/settings.html对于这个,以及许多其他的东西,比如这个网站上的问题,但我不能让我的工作 100%
截至目前,如果我更改列表首选项中的语言,活动 (SettingsActivity) 将不会自行更新(就像 20 次中有 1 次一样,不知何故它会更新,不知道为什么)。按后退按钮后,我的 MainActivity 也没有更新。但我的所有其他活动始终显示正确的语言,如果我返回到 SettingsActivity ,那么如果我重新启动应用程序,就可以了,与 MainActivity 一样。
相关零件:
主要活动:
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
}
设置活动
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());
}
}
设置Fragment.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
我对此感到疯狂,这是最好的工作状态,但我知道这里的活动生命周期管理远非最好,当我尝试使用这些时,通常我根本无法让它工作。我怎样才能使这项工作正常进行,以便它实际上在所有活动的运行时更新?