android 单双层桌面切换

来源：互联网发布：数据采集仪编辑：程序博客网时间：2024/05/21 08:40

单双层桌面切换由于必须持久化数据所以必须多创建单层桌面所须要的数据库表;

一表为存储桌面图标，表结构跟原生桌面表一样直接copy一份就可以了
一表为存储桌面页，表结构跟原生一样

创建上面两张表时注意下数据库版本升级带来的影响

由于表结构跟原生一样所以加载逻辑不需要改动直接按原生加载所需要改动的是加载的是哪个表

建立一个判断是否为单双层桌面的方法，此方法单双层桌面的标志

    /**add by lmjssjj begin*/    public static boolean isDisableAllApps(){        return false;    }    /**add by lmjssjj end*/

修改加载的数据表

 public static final class WorkspaceScreens implements ChangeLogColumns {        public static final String TABLE_NAME = "workspaceScreens";        /**add by lmjssjj begin*/        public static final String TABLE_DISABLEALLAPPS_NAME = "workspaceScreens_disable_allapps";        /**add by lmjssjj end*/        /**         * The content:// style URL for this table         */        static final Uri CONTENT_URI = Uri.parse("content://" +                ProviderConfig.AUTHORITY + "/" + /**modify by lmjssjj*/(LauncherAppState.isDisableAllApps()?TABLE_DISABLEALLAPPS_NAME:TABLE_NAME));        /**         * The rank of this screen -- ie. how it is ordered relative to the other screens.         * <P>Type: INTEGER</P>         */        public static final String SCREEN_RANK = "screenRank";    }

public static final class Favorites implements BaseLauncherColumns {        public static final String TABLE_NAME = "favorites";        /**add by lmjssjj begin*/        public static final String TABLE_DISABLEALLAPPS_NAME = "favorites_disable_allapps";        /**add by lmjssjj end*/        /**         * The content:// style URL for this table         */        public static final Uri CONTENT_URI = Uri.parse("content://" +                ProviderConfig.AUTHORITY + "/" +/**modify by lmjssjj*/ (LauncherAppState.isDisableAllApps()?TABLE_DISABLEALLAPPS_NAME:TABLE_NAME));        /**         * The content:// style URL for a given row, identified by its id.         *         * @param id The row id.         *         * @return The unique content URL for the specified row.         */        public static Uri getContentUri(long id) {            return Uri.parse("content://" + ProviderConfig.AUTHORITY +                    "/" + (LauncherAppState.isDisableAllApps()?TABLE_DISABLEALLAPPS_NAME:TABLE_NAME) + "/" + id);        }

添加数据库表
为了数据库版本升级单独建立

//add by lmjssjj        private void addFavoritesDisableAllappsTable(SQLiteDatabase db){             UserManagerCompat userManager = UserManagerCompat.getInstance(mContext);             long userSerialNumber =                     userManager.getSerialNumberForUser(UserHandleCompat.myUserHandle());            db.execSQL("CREATE TABLE favorites_disable_allapps (" + "_id INTEGER PRIMARY KEY," + "title TEXT,"                    + "intent TEXT," + "container INTEGER," + "screen INTEGER," + "cellX INTEGER,"                    + "cellY INTEGER," + "spanX INTEGER," + "spanY INTEGER," + "itemType INTEGER,"                    + "appWidgetId INTEGER NOT NULL DEFAULT -1," + "isShortcut INTEGER,"                    + "iconType INTEGER," + "iconPackage TEXT," + "iconResource TEXT,"                    + "icon BLOB," + "uri TEXT," + "displayMode INTEGER,"                    + "appWidgetProvider TEXT," + "modified INTEGER NOT NULL DEFAULT 0,"                    + "restored INTEGER NOT NULL DEFAULT 0," + "profileId INTEGER DEFAULT "                    + userSerialNumber + "," + "rank INTEGER NOT NULL DEFAULT 0,"                    + "options INTEGER NOT NULL DEFAULT 0" + ");");        }//end by lmjssjj        private void addWorkspacesTable(SQLiteDatabase db) {            db.execSQL("CREATE TABLE " + TABLE_WORKSPACE_SCREENS + " ("                    + LauncherSettings.WorkspaceScreens._ID + " INTEGER PRIMARY KEY,"                    + LauncherSettings.WorkspaceScreens.SCREEN_RANK + " INTEGER,"                    + LauncherSettings.ChangeLogColumns.MODIFIED + " INTEGER NOT NULL DEFAULT 0"                    + ");");        }

 private void setFlagDisableAllAppsEmptyDbCreated() {            String spKey = LauncherAppState.getSharedPreferencesKey();            SharedPreferences sp = mContext.getSharedPreferences(spKey, Context.MODE_PRIVATE);            sp.edit().putBoolean(EMPTY_DISABLEALLAPPS_DATABASE_CREATED, true).commit();        }public void clearFlagDisableAllAppsEmptyDbCreated() {        String spKey = LauncherAppState.getSharedPreferencesKey();        getContext().getSharedPreferences(spKey, Context.MODE_PRIVATE).edit()        .remove(EMPTY_DISABLEALLAPPS_DATABASE_CREATED).commit();    }

数据库表已建立完成接下来需要修改数据库的写入通过上面的判断方法修改写的读的表

 private long initializeMaxItemId(SQLiteDatabase db) {            return getMaxId(db, LauncherAppState.isDisableAllApps()?TABLE_FAVORITES_DISABLE_ALLAPPS:TABLE_FAVORITES);        }

private long initializeMaxScreenId(SQLiteDatabase db) {            return getMaxId(db, LauncherAppState.isDisableAllApps()?TABLE_WORKSPACE_SCREENS_DISABLE_ALLAPPS:TABLE_WORKSPACE_SCREENS);        }

 @Override        public long insertAndCheck(SQLiteDatabase db, ContentValues values) {            return dbInsertAndCheck(this, db, LauncherAppState.isDisableAllApps()?TABLE_FAVORITES_DISABLE_ALLAPPS:TABLE_FAVORITES, null, values);        }

接下来数据加载

boolean bl = prefs.getBoolean(LauncherAppState.isDisableAllApps()?LauncherProvider.EMPTY_DISABLEALLAPPS_DATABASE_CREATED:LauncherProvider.EMPTY_DATABASE_CREATED, false);

if(LauncherAppState.isDisableAllApps())                    LauncherAppState.getLauncherProvider().clearFlagDisableAllAppsEmptyDbCreated();

加载单层数据,双层数据照原生逻辑

        private void loadAllAppsFirst() {                final Callbacks oldCallbacks = mCallbacks.get();                if (oldCallbacks == null) {                    return;                }                final List<UserHandleCompat> profiles = mUserManager.getUserProfiles();                mBgAllAppsList.clear();                for (UserHandleCompat user : profiles) {                    final List<LauncherActivityInfoCompat> apps = mLauncherApps.getActivityList(null, user);                    if (apps == null || apps.isEmpty()) {                        return;                    }                    for (int i = 0; i < apps.size(); i++) {                        LauncherActivityInfoCompat app = apps.get(i);                        mBgAllAppsList.add(new AppInfo(mContext, app, user, mIconCache));                    }                    mBgAllAppsList.added.clear();            }            verifyApplications();            updateIconCache();            loadAndBindWidgetsAndShortcuts(tryGetCallbacks(oldCallbacks), true /* refresh */);        }

切换时重新加载我采用的是在设置页面（设置页在自己的进程） kill 自己：

ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);            activityManager.killBackgroundProcesses(getPackageName());finish();

合并数据

private void verifyApplications() {        final Context context = mApp.getContext();        // Cross reference all the applications in our apps list with items in        // the workspace        ArrayList<ItemInfo> tmpInfos;        ArrayList<ItemInfo> added = new ArrayList<ItemInfo>();        synchronized (sBgLock) {            for (AppInfo app : mBgAllAppsList.data) {                tmpInfos = getItemInfoForComponentName(app.componentName, app.user);                if (tmpInfos.isEmpty()) {                    // We are missing an application icon, so add this to the                    // workspace                    added.add(app);                    // This is a rare event, so lets log it                    Log.e(TAG, "Missing Application on load: " + app);                }            }        }        if (!added.isEmpty()) {            addAndBindAddedWorkspaceItems(context, added,true);        }    }

总结：
需要注意的
1、创建单层桌面所须数据库
2、数据库增删改查
3、当第一次加载单层桌面时，应用合并
4、当安装应用时
5、当卸载应用时(原生逻辑)
6、当应用更新时(原生逻辑)
7、判断应用是否是要卸载或者图标删除
8、快捷图标创建细节
9、单双切换

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