Add getDisplayName to SpellCheckerSubtype

  public final class SpellCheckerSubtype implements android.os.Parcelable {

    ctor public SpellCheckerSubtype(int, java.lang.String, java.lang.String);

    method public int describeContents();

    method public java.lang.CharSequence getDisplayName(android.content.Context, java.lang.String, android.content.pm.ApplicationInfo);

    method public java.lang.String getExtraValue();

    method public java.lang.String getLocale();

    method public int getNameResId();

package android.view.textservice;

import android.content.Context;

import android.content.pm.ApplicationInfo;

import android.os.Parcel;

import android.os.Parcelable;

import android.text.TextUtils;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.HashSet;

import java.util.List;

import java.util.Locale;

/**

 * This class is used to specify meta information of a subtype contained in a spell checker.

        return false;

    }

    private static Locale constructLocaleFromString(String localeStr) {

        if (TextUtils.isEmpty(localeStr))

            return null;

        String[] localeParams = localeStr.split("_", 3);

        // The length of localeStr is guaranteed to always return a 1 <= value <= 3

        // because localeStr is not empty.

        if (localeParams.length == 1) {

            return new Locale(localeParams[0]);

        } else if (localeParams.length == 2) {

            return new Locale(localeParams[0], localeParams[1]);

        } else if (localeParams.length == 3) {

            return new Locale(localeParams[0], localeParams[1], localeParams[2]);

        }

        return null;

    }

    /**

     * @param context Context will be used for getting Locale and PackageManager.

     * @param packageName The package name of the spell checker

     * @param appInfo The application info of the spell checker

     * @return a display name for this subtype. The string resource of the label (mSubtypeNameResId)

     * can have only one %s in it. If there is, the %s part will be replaced with the locale's

     * display name by the formatter. If there is not, this method simply returns the string

     * specified by mSubtypeNameResId. If mSubtypeNameResId is not specified (== 0), it's up to the

     * framework to generate an appropriate display name.

     */

    public CharSequence getDisplayName(

            Context context, String packageName, ApplicationInfo appInfo) {

        final Locale locale = constructLocaleFromString(mSubtypeLocale);

        final String localeStr = locale != null ? locale.getDisplayName() : mSubtypeLocale;

        if (mSubtypeNameResId == 0) {

            return localeStr;

        }

        final CharSequence subtypeName = context.getPackageManager().getText(

                packageName, mSubtypeNameResId, appInfo);

        if (!TextUtils.isEmpty(subtypeName)) {

            return String.format(subtypeName.toString(), localeStr);

        } else {

            return localeStr;

        }

    }

    @Override

    public int describeContents() {

        return 0;