Launcher3 快捷图标点击事件绑定-API28

launcher绑定view事件

1. Launcher.onCreate()->
   • (1) LauncherAppState app = LauncherAppState.getInstance(this)；
     获取getInstance单例,构造LauncherModel传入IconCache和IntentFilter filter放入 mBgAllAppsList并将LauncherAppState给mAPP;
   • (2) mModel = app.setLauncher(this);
     为launcher设置监听，
     LauncherAppState调用内部LauncherModel类型的mMode的initialize()方法将launcher作为callback加入mModel的WeakReference mCallbacks中
     并且返回mModel；
   • int currentScreen = PagedView.INVALID_RESTORE_PAGE;
     值是-1001
   • (3) mModel.startLoader(currentScreen);
2. LauncherModel.startLoader(int synchronousBindPage)返回值boolean->
   • (1) LoaderResults loaderResults = new LoaderResults(mApp, sBgDataModel,mBgAllAppsList, synchronousBindPage, mCallbacks);
   • 所需变量sBgDataModel类加载的时候初始化，synchronousBindPage是方法调用传入；
     在LancherAppState的构造方法中调用LauncherModel构造方法传入mApp（LauncherAppState）和mBgAllAppsList，
     LancherAppState调用LauncherModel的initialize传入mCallbacks;
   • (2)startLoaderForResults(loaderResults);
   • 因为mModelLoaded默认是false所以调用；
3. LoaderResults.startLoaderForResults(LoaderResults results)->
   清空mLoaderTask并停止旧的，mLoaderTask = new LoaderTask(mApp, mBgAllAppsList, sBgDataModel, results);然后执行它
4. new LoaderTask()->
   将mApp、mBgAllAppsList、mBgDataModel、mResults = results;
   并获取以下实例
   mLauncherApps = LauncherAppsCompat.getInstance(mApp.getContext());
   mUserManager = UserManagerCompat.getInstance(mApp.getContext());
   mShortcutManager = DeepShortcutManager.getInstance(mApp.getContext());
   mPackageInstaller = PackageInstallerCompat.getInstance(mApp.getContext());
   mAppWidgetManager = AppWidgetManagerCompat.getInstance(mApp.getContext());
   mIconCache = mApp.getIconCache();
   //来自LauncherAppState，提供icon获取主要来自 IconProvider IconDB mPackageManager
   //mPackageManager是获取应用resources对应id图片
   //为DB获取提供本地缓存
5. LoaderTask.run()->
   因为mStopped默认false所以开始下面的流程
   • (1) 创建自动关闭流LauncherModel.LoaderTransaction，
     并将自己传入，用于判断是否操作当前对象；
   • (2) 调用loadWorkspace()
     主要看synchronized (mBgDataModel){}大括号内代码
     mBgDataModel.clear（）
     清除mBgDataModel内部所以缓存
     mPackageInstaller.updateAndGetActiveSessionCache()
     获取已安装信息
     mFirstScreenBroadcast = new FirstScreenBroadcast(installingPkgs);
     新建第一个屏幕的广播
     mBgDataModel.workspaceScreens.addAll(LauncherModel.loadWorkspaceScreensDb(context))
     工作屏幕id
     final LoaderCursor c = new LoaderCursor(contentResolver.query(
     LauncherSettings.Favorites.CONTENT_URI, null, null, null, null), mApp);
     获取桌面快捷图标信息，
     然后循环游标获取，标记当前删除或者更新对应内容，
     然后把属性封装各种类型的info装入mBgDataModel，当前元素最多是一种info：
     ShortcutInfo， SessionInfo（会被转成ShortcutInfo） FolderInfo， LauncherAppWidgetInfo
   • (3) mResults.bindWorkspace()
     mBgDataModel的ItemInfo、LauncherAppWidgetInfo、屏幕Id放到本地各自的list当中
     按照当前屏幕把itemInfo和LauncherAppWidgetInfo各自分成current和other两个list
     然后筛选当前屏幕的itemInfo和LauncherAppWidgetInfo
     排序当前iteminfo和otheriteminfo
     在MainThreadExecutor中执行调用callbacks.startBinding()的Runnable，做清空和刷新操作
     在MainThreadExecutor中执行调用callbacks.bindScreens(orderedScreenIds)的Runnable，绑定屏幕id到Workspace
     然后绑定快捷图标和部件到当前页bindWorkspaceItems(currentWorkspaceItems, currentAppWidgets, mainExecutor)
     /packages/apps/Launcher3/src/com/android/launcher3/Launcher.java
     获取final Executor deferredExecutor =
     validFirstPage ? new ViewOnDrawExecutor() : mainExecutor;
     在MainThreadExecutor中执行调用
     callbacks.finishFirstPageBind(validFirstPage ? (ViewOnDrawExecutor) deferredExecutor : null)的Runnable，如果需要立马显示第一个屏幕就不执行属性动画直到它的ondraw方法完成，否则执行动画
     绑定快捷图标和部件到页面bindWorkspaceItems(otherWorkspaceItems, otherAppWidgets, deferredExecutor)
     主要分析点击事件是如何绑定所以就到这里----------------
6. mResults.bindWorkspace()
   将callbacks.bindItems(workspaceItems.subList(start, start+chunkSize), false)的runnable放入调度器执行
7. Launcher.bindItems(final List<ItemInfo> items, final boolean forceAnimateIcons)
   当item.itemType是下面这三种时：
   LauncherSettings.Favorites.ITEM_TYPE_APPLICATION:
   LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:
   LauncherSettings.Favorites.ITEM_TYPE_DEEP_SHORTCUT:
   获取WorkspaceItemInfo info = (WorkspaceItemInfo) item;
   然后调用view = createShortcut(info);
8. createShortcut(info)调用了
   createShortcut((ViewGroup) mWorkspace.getChildAt(mWorkspace.getCurrentPage()), info)
   createShortcut(ViewGroup parent, WorkspaceItemInfo info)
   最终给BubbleTextView绑定了onclick事件

public View createShortcut(ViewGroup parent, WorkspaceItemInfo info) {
        BubbleTextView favorite = (BubbleTextView) LayoutInflater.from(parent.getContext())
                .inflate(R.layout.app_icon, parent, false);
        favorite.applyFromWorkspaceItem(info);
        favorite.setOnClickListener(ItemClickHandler.INSTANCE);
        favorite.setOnFocusChangeListener(mFocusHandler);
        return favorite;
    }