Android Settings ——language / locale 修改语言

看过就忘！为了照顾自己的痴呆脑，劳累双手记录一下。

packages/apps/Settings/AndroidManifest.xml

packages/apps/Settings/src/com/android/settings/inputmethod/InputMethodAndLanguageSettings.java

import android.os.LocaleList (全部语言)

import com.android.internal.app.LocaleHelper

import com.android.internal.app.LocalePicker （已选语言）

import java.util.Locale

    private static String getLocaleNames(Context context) {        final LocaleList locales = LocalePicker.getLocales();        final Locale displayLocale = Locale.getDefault();        return LocaleHelper.toSentenceCase(                LocaleHelper.getDisplayLocaleList(                        locales, displayLocale, 2 /* Show up to two locales from the list */),                displayLocale);    }

libcore/ojluni/src/main/java/java/util/Locale.java

external/libgdx/backends/gdx/-backends-gwt/src/com/badlogic/gdx/backends/gwt/emu/jaba/util/Locale.java

frameworks/base/core/java/com/android/internalapp/LocalePicker.java

[UI 主view]

packages/apps/Settings/src/com/android/settings/inputmethod/InputMethodAndLanguageSettings.java

public void onCreate(Bundle icicle) {        addPreferencesFromResource(R.xml.language_settings);}

packages/apps/Settings/res/xml/language_settings.xml/language_settings

packages/apps/Settings/src/com/android/settings/localepicker/LocaleListEditor.java

    @Override    public void onLocaleSelected(LocaleStore.LocaleInfo locale) {        mAdapter.addLocale(locale);        updateVisibilityOfRemoveMenu();    }

packages/apps/Settings/src/com/android/settings/localepicker/LocaleDragAndDropAdapter.java

    void addLocale(LocaleStore.LocaleInfo li) {        mFeedItemList.add(li);        notifyItemInserted(mFeedItemList.size() - 1);        doTheUpdate();    }

    public void updateLocalesWhenAnimationStops(final LocaleList localeList) {            final RecyclerView.ItemAnimator itemAnimator = mParentView.getItemAnimator();        itemAnimator.isRunning(new RecyclerView.ItemAnimator.ItemAnimatorFinishedListener() {            @Override            public void onAnimationsFinished() {                LocalePicker.updateLocales(mLocalesToSetNext);            }        });    }

frameworks/base/core/java/com/android/internalapp/LocalePicker.java

    public static void updateLocales(LocaleList locales) {        try {            final IActivityManager am = ActivityManagerNative.getDefault();            final Configuration config = am.getConfiguration();            config.setLocales(locales);            config.userSetLocale = true;            am.updatePersistentConfiguration(config);            // Trigger the dirty bit for the Settings Provider.            BackupManager.dataChanged("com.android.providers.settings");        } catch (RemoteException e) {            // Intentionally left blank        }    }

frameworks/base/core/java/android/app/ActivityManagerNative .java

    static public IActivityManager getDefault() {        return gDefault.get();    }

ActivityManagerNative 的 getDefault() ，返回的是远程服务对象 ActivityManagerServices.java 在本地的一个代理，最终调用的是ActivityManagerServices.java 中的 updateCofiguration() 函数。

frameworks/base/core/java/android/app/IActivityManager.java

public void updatePersistentConfiguration(Configuration values) throws RemoteException;

frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java

  private boolean updateConfigurationLocked(Configuration values, ActivityRecord starting,            boolean initLocale, boolean persistent, int userId, boolean deferResume) {          if (values != null) {            Configuration newConfig = new Configuration(mConfiguration);            changes = newConfig.updateFrom(values);            if (changes != 0) {                            if (!initLocale && !values.getLocales().isEmpty() && values.userSetLocale) {                    final LocaleList locales = values.getLocales();                    int bestLocaleIndex = 0;                    if (locales.size() > 1) {                        if (mSupportedSystemLocales == null) {                            mSupportedSystemLocales =                                    Resources.getSystem().getAssets().getLocales();                        }                        bestLocaleIndex = Math.max(0,                                locales.getFirstMatchIndex(mSupportedSystemLocales));                    }                    SystemProperties.set("persist.sys.locale",                            locales.get(bestLocaleIndex).toLanguageTag());                    LocaleList.setDefault(locales, bestLocaleIndex);                    mHandler.sendMessage(mHandler.obtainMessage(SEND_LOCALE_TO_MOUNT_DAEMON_MSG,                            locales.get(bestLocaleIndex)));                }                      }        return kept;    }

frameworks/base/core/java/android/content/res/Configuration.java

public @Config int updateFrom(@NonNull Configuration delta) {        int changed = 0;        fixUpLocaleList();        delta.fixUpLocaleList();        if (!delta.mLocaleList.isEmpty() && !mLocaleList.equals(delta.mLocaleList)) {            changed |= ActivityInfo.CONFIG_LOCALE;            mLocaleList = delta.mLocaleList;            // delta.locale can't be null, since delta.mLocaleList is not empty.            if (!delta.locale.equals(locale)) {                locale = (Locale) delta.locale.clone();                // If locale has changed, then layout direction is also changed ...                changed |= ActivityInfo.CONFIG_LAYOUT_DIRECTION;                // ... and we need to update the layout direction (represented by the first                // 2 most significant bits in screenLayout).                setLayoutDirection(locale);            }        }        if (delta.userSetLocale && (!userSetLocale || ((changed & ActivityInfo.CONFIG_LOCALE) != 0)))        {            changed |= ActivityInfo.CONFIG_LOCALE;            userSetLocale = true;        }        return changed;    }

target locale file : "persist.sys.locale" (data/property/persist.sys.locale)

2) 所有语言文件

packages/apps/Settings/src/com/android/settings/localepicker/LocaleListEditor.java

    private void configureDragAndDrop(View view) {        mAddLanguage = view.findViewById(R.id.add_language);        mAddLanguage.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                final LocalePickerWithRegion selector = LocalePickerWithRegion.createLanguagePicker(                        getContext(), LocaleListEditor.this, false /* translate only */);            }        });    }

frameworks/base/core/java/com/android/internalapp/LocalePickerWithRegion.java

    public static LocalePickerWithRegion createLanguagePicker(Context context,            LocaleSelectedListener listener, boolean translatedOnly) {        LocalePickerWithRegion localePicker = new LocalePickerWithRegion();        localePicker.setListener(context, listener, /* parent */ null, translatedOnly);        return localePicker;    }

 private boolean setListener(Context context, LocaleSelectedListener listener,            LocaleStore.LocaleInfo parent, boolean translatedOnly) {              final HashSet langTagsToIgnore = new HashSet<>();        if (!translatedOnly) {            final LocaleList userLocales = LocalePicker.getLocales();            final String[] langTags = userLocales.toLanguageTags().split(",");            Collections.addAll(langTagsToIgnore, langTags);        }        if (parent != null) {        } else {            mLocaleList = LocaleStore.getLevelLocales(context, langTagsToIgnore,                    null /* no parent */, translatedOnly);        }        return true;    }

frameworks/base/core/java/com/android/internalapp/LocaleStore.java

 public static Set getLevelLocales(Context context, Set ignorables,            LocaleInfo parent, boolean translatedOnly) {        fillCache(context);        for (LocaleStore.LocaleInfo li : sLocaleCache.values()) {        }        return result;    }

   public static void fillCache(Context context) {           for (String localeId : LocalePicker.getSupportedLocales(context)) {                      LocaleInfo li = new LocaleInfo(localeId);               sLocaleCache.put(li.getId(), li);        }    }

frameworks/base/core/java/com/android/internalapp/LocalePicker.java

    public static String[] getSupportedLocales(Context context) {        return context.getResources().getStringArray(R.array.supported_locales);    }

全部语言 file ： frameworks/base/core/res/res/values/locale_config.xml

3) LocalePicker.getLocales()

frameworks/base/core/java/com/android/internalapp/LocalePicker.java

    public static LocaleList getLocales() {        try {            return ActivityManagerNative.getDefault()                    .getConfiguration().getLocales();        } catch (RemoteException e) {            // If something went wrong            return LocaleList.getDefault();        }    }

frameworks/base/core/java/android/content/res/Configuration.java

    public @NonNull LocaleList getLocales() {        fixUpLocaleList();        return mLocaleList;    }

    private void fixUpLocaleList() {        if ((locale == null && !mLocaleList.isEmpty()) ||                (locale != null && !locale.equals(mLocaleList.get(0)))) {            mLocaleList = locale == null ? LocaleList.getEmptyLocaleList() : new LocaleList(locale);        }    }

frameworks/base/core/java/android/os/LocaleList.java

private static final LocaleList sEmptyLocaleList = new LocaleList();    public LocaleList(@NonNull Locale... list) {        if (list.length == 0) {            mList = sEmptyList;            mStringRepresentation = "";        } else {            final Locale[] localeList = new Locale[list.length];            final HashSet seenLocales = new HashSet();            final StringBuilder sb = new StringBuilder();            for (int i = 0; i < list.length; i++) {                final Locale l = list[i];                if (l == null) {                    throw new NullPointerException("list[" + i + "] is null");                } else if (seenLocales.contains(l)) {                    throw new IllegalArgumentException("list[" + i + "] is a repetition");                } else {                    final Locale localeClone = (Locale) l.clone();                    localeList[i] = localeClone;                    sb.append(localeClone.toLanguageTag());                    if (i < list.length - 1) {                        sb.append(',');                    }                    seenLocales.add(localeClone);                }            }            mList = localeList;            mStringRepresentation = sb.toString();        }    }

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