从外部读取预置桌面布局

private static final String external_workspace = "/system/default_workspace.xml";  
  
//。。。。。  
  
        if(mOpenHelper.loadFavoritesFromExternal(mOpenHelper.getWritableDatabase()) == 0){  
              mOpenHelper.loadFavorites(mOpenHelper.getWritableDatabase(), R.xml.default_workspace);  
  
//。。。。DatabaseHelper增加常量  
        private static final String TAG_OUT_SHORTCUT = "out-shortcut";  
        private static final String TAG_OUT_FOLDER = "out-folder";  
  
//....  
  
    private int loadFavoritesFromExternal(SQLiteDatabase db) {  
            Intent intent = new Intent(Intent.ACTION_MAIN, null);  
            intent.addCategory(Intent.CATEGORY_LAUNCHER);  
            ContentValues values = new ContentValues();  
  
            PackageManager packageManager = mContext.getPackageManager();  
/* 
            int rid = -1; 
            Resources dwRes = null; 
            Context dwCxt = null; 
            try { 
                ArrayList list = (ArrayList) packageManager.getInstalledPackages(PackageManager.GET_ACTIVITIES); 
//                for(int z = 0;z= 0;  
                            } else if (TAG_SEARCH.equals(name)) {  
                                added = addSearchWidget(db, values);  
                            } else if (TAG_CLOCK.equals(name)) {  
                                added = addClockWidget(db, values);  
                            } else if (TAG_APPWIDGET.equals(name)) {  
                                added = addAppWidget(db, values, new ComponentName(packName, clzName), Integer.valueOf(spanX.trim()), Integer.valueOf(spanY.trim()));  
                            } else if (TAG_OUT_SHORTCUT.equals(name)) {  
                                long id = addUriShortcut(db, values, uri , title, icon);  
                                added = id >= 0;  
                            } else if (TAG_OUT_FOLDER.equals(name)) {  
                                values.put(LauncherSettings.Favorites.TITLE, title);  
                                long folderId = addFolder(db, values);  
                                added = folderId >= 0;  
  
                                ArrayList folderItems = new ArrayList();  
  
                                int folderDepth = parserOut.getDepth();  
                                while ((type = parserOut.next()) != XmlPullParser.END_TAG || parserOut.getDepth() > folderDepth) {  
                                    if (type != XmlPullParser.START_TAG) {  
                                        continue;  
                                    }  
  
                                    String packNameItem = null;  
                                    String clzNameItem = null;  
                                    String titleItem = null;  
                                    String iconItem = null;  
                                    String uriItem = null;  
  
                                    int itemCount = parserOut.getAttributeCount();  
                                    for (int z = 0; z < itemCount; z++) {  
  
                                        String key = parserOut.getAttributeName(z);  
                                        String value = parserOut.getAttributeValue(z);  
//System.out.println(" ITEM " + key + " " + value);  
  
                                        if ("packageName".equals(key)) {  
                                            packNameItem = value;  
                                        } else if ("className".equals(key)) {  
                                            clzNameItem = value;  
                                        } else if ("title".equals(key)) {  
                                            titleItem = value;  
                                        } else if ("icon".equals(key)) {  
                                            iconItem = value;  
                                        } else if ("uri".equals(key)) {  
                                            uriItem = value;  
                                        }  
  
                                    }  
  
                                    final String folder_item_name = parserOut.getName();  
  
                                    values.clear();  
                                    values.put(LauncherSettings.Favorites.CONTAINER, folderId);  
  
                                    if (TAG_FAVORITE.equals(folder_item_name) && folderId >= 0) {  
                                        long id = addAppShortcut(db, values, packNameItem, clzNameItem, packageManager, intent);  
                                        if (id >= 0) {  
                                            folderItems.add(id);  
                                        }  
                                    } else if (TAG_OUT_SHORTCUT.equals(folder_item_name) && folderId >= 0) {  
                                        long id = addUriShortcut(db, values, uriItem, titleItem, iconItem);  
                                        if (id >= 0) {  
                                            folderItems.add(id);  
                                        }  
                                    } else {  
                                        throw new RuntimeException("Folders can " + "contain only shortcuts");  
                                    }  
                                }  
                            }  
                            if (added) i++;  
                            break;  
                        case XmlPullParser.END_TAG:// 判断当前事件是否是标签元素结束事件  
                            if (TAG_FAVORITE.equals(parserOut.getName())) {// 判断结束标签元素  
                            }  
                            break;  
                        }  
                        event = parserOut.next();// 进入下一个元素并触发相应事件  
                    }// end while  
  
            } catch (XmlPullParserException e) {  
                Log.w(TAG, "Got exception parsing favorites.", e);  
            } catch (IOException e) {  
                Log.w(TAG, "Got exception parsing favorites.", e);  
            } catch (RuntimeException e) {  
                Log.w(TAG, "Got exception parsing favorites.", e);  
            }  
  
            return i;  
    }  
  
  
  
        private long addAppShortcut(SQLiteDatabase db, ContentValues values, String packName, String clzName,  
                PackageManager packageManager, Intent intent) {  
            long id = -1;  
            ActivityInfo info;  
            String packageName = packName;  
            String className = clzName;  
            try {  
                ComponentName cn;  
                try {  
                    cn = new ComponentName(packageName, className);  
                    info = packageManager.getActivityInfo(cn, 0);  
                } catch (PackageManager.NameNotFoundException nnfe) {  
                    String[] packages = packageManager.currentToCanonicalPackageNames(  
                        new String[] { packageName });  
                    cn = new ComponentName(packages[0], className);  
                    info = packageManager.getActivityInfo(cn, 0);  
                }  
                id = generateNewId();  
                intent.setComponent(cn);  
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK |  
                        Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);  
                values.put(Favorites.INTENT, intent.toUri(0));  
                values.put(Favorites.TITLE, info.loadLabel(packageManager).toString());  
                values.put(Favorites.ITEM_TYPE, Favorites.ITEM_TYPE_APPLICATION);  
                values.put(Favorites.SPANX, 1);  
                values.put(Favorites.SPANY, 1);  
                values.put(Favorites._ID, generateNewId());  
                if (dbInsertAndCheck(this, db, TABLE_FAVORITES, null, values) < 0) {  
                    return -1;  
                }  
            } catch (PackageManager.NameNotFoundException e) {  
                Log.w(TAG, "Unable to add favorite: " + packageName +  
                        "/" + className, e);  
            }  
            return id;  
        }  
  
  
  
  
        private boolean addAppWidget(SQLiteDatabase db, ContentValues values, ComponentName cn,  
                int spanX, int spanY) {  
            boolean allocatedAppWidgets = false;  
            final AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(mContext);  
  
            try {  
                int appWidgetId = mAppWidgetHost.allocateAppWidgetId();  
  
                values.put(Favorites.ITEM_TYPE, Favorites.ITEM_TYPE_APPWIDGET);  
                values.put(Favorites.SPANX, spanX);  
                values.put(Favorites.SPANY, spanY);  
                values.put(Favorites.APPWIDGET_ID, appWidgetId);  
                values.put(Favorites._ID, generateNewId());  
                dbInsertAndCheck(this, db, TABLE_FAVORITES, null, values);  
  
                allocatedAppWidgets = true;  
  
                appWidgetManager.bindAppWidgetId(appWidgetId, cn);  
            } catch (RuntimeException ex) {  
                Log.e(TAG, "Problem allocating appWidgetId", ex);  
            }  
  
            return allocatedAppWidgets;  
        }  
  
  
private long addUriShortcut(SQLiteDatabase db, ContentValues values, String uri, String title, String icon) {  
            Resources r = mContext.getResources();  
  
            final int iconResId = R.drawable.ic_launcher_shortcut_browser_bookmark;  
            // final int titleResId =  
            // a.getResourceId(R.styleable.Favorite_title, 0);  
  
            Intent intent;  
            try {  
                intent = Intent.parseUri(uri, 0);  
            } catch (URISyntaxException e) {  
                Log.w(TAG, "Shortcut has malformed uri: " + uri);  
                return -1; // Oh well  
            }  
  
            if (iconResId == 0) { // || titleResId == 0) {  
                Log.w(TAG, "Shortcut is missing icon resource ID");  
                return -1;  
            }  
  
            long id = generateNewId();  
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
            values.put(Favorites.INTENT, intent.toUri(0));  
            values.put(Favorites.TITLE, title);  
            values.put(Favorites.ITEM_TYPE, Favorites.ITEM_TYPE_SHORTCUT);  
            values.put(Favorites.SPANX, 1);  
            values.put(Favorites.SPANY, 1);  
            values.put(Favorites.ICON_TYPE, Favorites.ICON_TYPE_RESOURCE);  
            values.put(Favorites.ICON_PACKAGE, mContext.getPackageName());  
            values.put(Favorites.ICON_RESOURCE, r.getResourceName(iconResId));  
            values.put(Favorites._ID, id);  
  
            if (dbInsertAndCheck(this, db, TABLE_FAVORITES, null, values) < 0) {  
                return -1;  
            }  
            return id;  
        }  
  
    }