Launcher app数据加载流程
2024-04-25 05:38:08
Launcher是桌面，是用户第一眼看到的app应用，所有的应用都是现实通过Launcher管理显示在桌面上的！当app应用很多的时候，数据是怎么样加载的呢!我说一说单层桌面加载的流程上图是双层数据加载流程，单层的只要看左边四个加Launcher就可以了
首先我们要找到桌面的入口在哪里！就在Launcher oncreate（）；
@Overrideprotected void onCreate(Bundle savedInstanceState) {............super.onCreate(savedInstanceState);LauncherAppState.setApplicationContext(getApplicationContext());LauncherAppState app = LauncherAppState.getInstance();// Determine the dynamic grid propertiesPoint smallestSize = new Point();Point largestSize = new Point();Point realSize = new Point();Display display = getWindowManager().getDefaultDisplay();display.getCurrentSizeRange(smallestSize, largestSize);display.getRealSize(realSize);DisplayMetrics dm = new DisplayMetrics();display.getMetrics(dm);// Lazy-initialize the dynamic gridDeviceProfile grid = app.initDynamicGrid(this,Math.min(smallestSize.x, smallestSize.y),Math.min(largestSize.x, largestSize.y),realSize.x, realSize.y,dm.widthPixels, dm.heightPixels);// the LauncherApplication should call this, but in case of Instrumentation it might not be present yetmSharedPrefs = getSharedPreferences(LauncherAppState.getSharedPreferencesKey(),Context.MODE_PRIVATE);mModel = app.setLauncher(this);mIconCache = app.getIconCache();mDragController = new DragController(this);mInflater = getLayoutInflater();mStats = new Stats(this);mAppWidgetManager = AppWidgetManager.getInstance(this);mAppWidgetHost = new LauncherAppWidgetHost(this, APPWIDGET_HOST_ID);mAppWidgetHost.startListening();// If we are getting an onCreate, we can actually preempt onResume and unset mPaused here,// this also ensures that any synchronous binding below doesn't re-trigger another// LauncherModel load.mPaused = false;if (PROFILE_STARTUP) {android.os.Debug.startMethodTracing(Environment.getExternalStorageDirectory() + "/launcher");}checkForLocaleChange();setContentView(R.layout.launcher);setupViews();grid.layout(this);registerContentObservers();lockAllApps();mSavedState = savedInstanceState;restoreState(mSavedState);// Update customization drawer _after_ restoring the statesif (mAppsCustomizeContent != null) {mAppsCustomizeContent.onPackagesUpdated(LauncherModel.getSortedWidgetsAndShortcuts(this));}if (PROFILE_STARTUP) {android.os.Debug.stopMethodTracing();}if (!mRestoring) {if (sPausedFromUserAction) {// If the user leaves launcher, then we should just load items asynchronously when// they return.mModel.startLoader(true, -1);} else {// We only load the page synchronously if the user rotates (or triggers a// configuration change) while launcher is in the foregroundmModel.startLoader(true, mWorkspace.getCurrentPage());}}............}
``在这里面是初始化一些对象，if (!mRestoring) {
if (sPausedFromUserAction) {
// If the user leaves launcher, then we should just load items asynchronously when
// they return.
mModel.startLoader(true, -1);
} else {
// We only load the page synchronously if the user rotates (or triggers a
// configuration change) while launcher is in the foreground
mModel.startLoader(true, mWorkspace.getCurrentPage());
}
}
这里才是数据加载的入口，mRestoring 是在restoreState（）方法置换成true，说明在非正常停止的状态下，所以只要不是系统kill掉，mRestoring始终是false，往下看：sPausedFromUserAction=true：是在用户离开Laucnher，又回到Launcher我们需要异步加载数据，反之，我们加载同步加载这一页的数据,那就进入mModel.startLoader的方法！public void startLoader(boolean isLaunching, int synchronousBindPage) {synchronized (mLock) {if (DEBUG_LOADERS) {Log.d(TAG, "startLoader isLaunching=" + isLaunching);}//ear any deferred bind-runnables from the synchronized load process// We must do this before any loading/binding is scheduled below.mDeferredBindRunnables.clear();// Don't bother to start the thread if we know it's not going to do anythingif (mCallbacks != null && mCallbacks.get() != null) {// If there is already one running, tell it to stop.// also, don't downgrade isLaunching if we're already runningisLaunching = isLaunching || stopLoaderLocked();mLoaderTask = new LoaderTask(mApp.getContext(), isLaunching);if (synchronousBindPage > -1 && mAllAppsLoaded && mWorkspaceLoaded) {mLoaderTask.runBindSynchronousPage(synchronousBindPage);} else {sWorkerThread.setPriority(Thread.NORM_PRIORITY);sWorker.post(mLoaderTask);}}}}相当于一个同步方法， mLoaderTask = new LoaderTask(mApp.getContext(), isLaunching);这是一个线程，加载数据肯定要用到线程，找到这个类，往里继续跟找到run方法就可以了
public void run() {boolean isUpgrade = false;synchronized (mLock) {mIsLoaderTaskRunning = true;}// Optimize for end-user experience: if the Launcher is up and // running with the// All Apps interface in the foreground, load All Apps first. Otherwise, load the// workspace first (default).keep_running: {// Elevate priority when Home launches for the first time to avoid// starving at boot time. Staring at a blank home is not cool.synchronized (mLock) {if (DEBUG_LOADERS) Log.d(TAG, "Setting thread priority to " +(mIsLaunching ? "DEFAULT" : "BACKGROUND"));Process.setThreadPriority(mIsLaunching? Process.THREAD_PRIORITY_DEFAULT : Process.THREAD_PRIORITY_BACKGROUND);}if (DEBUG_LOADERS) Log.d(TAG, "step 1: loading workspace");isUpgrade = loadAndBindWorkspace();if (mStopped) {break keep_running;}// Whew! Hard work done. Slow us down, and wait until the UI thread has// settled down.synchronized (mLock) {if (mIsLaunching) {if (DEBUG_LOADERS) Log.d(TAG, "Setting thread priority to BACKGROUND");Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);}}waitForIdle();// second stepif (DEBUG_LOADERS) Log.d(TAG, "step 2: loading all apps");loadAndBindAllApps();// Restore the default thread priority after we are done loading itemssynchronized (mLock) {Process.setThreadPriority(Process.THREAD_PRIORITY_DEFAULT);}}// Update the saved icons if necessaryif (DEBUG_LOADERS) Log.d(TAG, "Comparing loaded icons to database icons");synchronized (sBgLock) {for (Object key : sBgDbIconCache.keySet()) {updateSavedIcon(mContext, (ShortcutInfo) key, sBgDbIconCache.get(key));}sBgDbIconCache.clear();}if (AppsCustomizePagedView.DISABLE_ALL_APPS) {// Ensure that all the applications that are in the system are// represented on the home screen.if (!UPGRADE_USE_MORE_APPS_FOLDER || !isUpgrade) {verifyApplications();}}// Clear out this reference, otherwise we end up holding it until all of the// callback runnables are done.mContext = null;synchronized (mLock) {// If we are still the last one to be scheduled, remove ourselves.if (mLoaderTask == this) {mLoaderTask = null;}mIsLoaderTaskRunning = false;}}在上面看到 isUpgrade = loadAndBindWorkspace(); 加载并且绑定桌面；往里面跟进去
private boolean loadAndBindWorkspace() {mIsLoadingAndBindingWorkspace = true;// Load the workspaceif (DEBUG_LOADERS) {Log.d(TAG, "loadAndBindWorkspace mWorkspaceLoaded=" + mWorkspaceLoaded);}boolean isUpgradePath = false;if (!mWorkspaceLoaded) {isUpgradePath = loadWorkspace();synchronized (LoaderTask.this) {if (mStopped) {return isUpgradePath;}mWorkspaceLoaded = true;}}// Bind the workspacebindWorkspace(-1, isUpgradePath);return isUpgradePath;}这个方法主要是做mWorkspaceLoaded加载过了就直接绑定bindWorkspace(-1, isUpgradePath);，没有加载就去loadWorkspace（）加载桌面，去看看加载桌面；
private boolean loadWorkspace() {final long t = DEBUG_LOADERS ? SystemClock.uptimeMillis() : 0;final Context context = mContext;final ContentResolver contentResolver = context.getContentResolver();final PackageManager manager = context.getPackageManager();final AppWidgetManager widgets = AppWidgetManager.getInstance(context);final boolean isSafeMode = manager.isSafeMode();LauncherAppState app = LauncherAppState.getInstance();DeviceProfile grid = app.getDynamicGrid().getDeviceProfile();int countX = (int) grid.numColumns;int countY = (int) grid.numRows;// Make sure the default workspace is loaded, if neededLauncherAppState.getLauncherProvider().loadDefaultFavoritesIfNecessary(0);// Check if we need to do any upgrade-path logicboolean loadedOldDb = LauncherAppState.getLauncherProvider().justLoadedOldDb();synchronized (sBgLock) {clearSBgDataStructures();final ArrayList<Long> itemsToRemove = new ArrayList<Long>();final Uri contentUri = LauncherSettings.Favorites.CONTENT_URI;if (DEBUG_LOADERS) Log.d(TAG, "loading model from " + contentUri);final Cursor c = contentResolver.query(contentUri, null, null, null, null);// +1 for the hotseat (it can be larger than the workspace)// Load workspace in reverse order to ensure that latest items are loaded first (and// before any earlier duplicates)final HashMap<Long, ItemInfo[][]> occupied = new HashMap<Long, ItemInfo[][]>();try {final int idIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites._ID);final int intentIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.INTENT);final int titleIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.TITLE);final int iconTypeIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.ICON_TYPE);final int iconIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.ICON);final int iconPackageIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.ICON_PACKAGE);final int iconResourceIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.ICON_RESOURCE);final int containerIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.CONTAINER);final int itemTypeIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.ITEM_TYPE);final int appWidgetIdIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.APPWIDGET_ID);final int appWidgetProviderIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.APPWIDGET_PROVIDER);final int screenIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.SCREEN);final int cellXIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.CELLX);final int cellYIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.CELLY);final int spanXIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.SPANX);final int spanYIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.SPANY);//final int uriIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.URI);//final int displayModeIndex = c.getColumnIndexOrThrow(// LauncherSettings.Favorites.DISPLAY_MODE);ShortcutInfo info;String intentDescription;LauncherAppWidgetInfo appWidgetInfo;int container;long id;Intent intent;while (!mStopped && c.moveToNext()) {AtomicBoolean deleteOnItemOverlap = new AtomicBoolean(false);try {int itemType = c.getInt(itemTypeIndex);switch (itemType) {case LauncherSettings.Favorites.ITEM_TYPE_APPLICATION:case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:id = c.getLong(idIndex);intentDescription = c.getString(intentIndex);try {intent = Intent.parseUri(intentDescription, 0);ComponentName cn = intent.getComponent();if (cn != null && !isValidPackageComponent(manager, cn)) {if (!mAppsCanBeOnRemoveableStorage) {// Log the invalid package, and remove it from the dbLauncher.addDumpLog(TAG, "Invalid package removed: " + cn, true);itemsToRemove.add(id);} else {// If apps can be on external storage, then we just// leave them for the user to remove (maybe add// visual treatment to it)Launcher.addDumpLog(TAG, "Invalid package found: " + cn, true);}continue;}} catch (URISyntaxException e) {Launcher.addDumpLog(TAG, "Invalid uri: " + intentDescription, true);continue;}if (itemType == LauncherSettings.Favorites.ITEM_TYPE_APPLICATION) {info = getShortcutInfo(manager, intent, context, c, iconIndex,titleIndex, mLabelCache);} else {info = getShortcutInfo(c, context, iconTypeIndex,iconPackageIndex, iconResourceIndex, iconIndex,titleIndex);// App shortcuts that used to be automatically added to Launcher// didn't always have the correct intent flags set, so do that// hereif (intent.getAction() != null &&intent.getCategories() != null &&intent.getAction().equals(Intent.ACTION_MAIN) &&intent.getCategories().contains(Intent.CATEGORY_LAUNCHER)) {intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK |Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);}}if (info != null) {info.id = id;info.intent = intent;container = c.getInt(containerIndex);info.container = container;info.screenId = c.getInt(screenIndex);info.cellX = c.getInt(cellXIndex);info.cellY = c.getInt(cellYIndex);info.spanX = 1;info.spanY = 1;// Skip loading items that are out of boundsif (container == LauncherSettings.Favorites.CONTAINER_DESKTOP) {if (checkItemDimensions(info)) {Launcher.addDumpLog(TAG, "Skipped loading out of bounds shortcut: "+ info + ", " + grid.numColumns + "x" + grid.numRows, true);continue;}}// check & update map of what's occupieddeleteOnItemOverlap.set(false);if (!checkItemPlacement(occupied, info, deleteOnItemOverlap)) {if (deleteOnItemOverlap.get()) {itemsToRemove.add(id);}break;}switch (container) {case LauncherSettings.Favorites.CONTAINER_DESKTOP:case LauncherSettings.Favorites.CONTAINER_HOTSEAT:sBgWorkspaceItems.add(info);break;default:// Item is in a user folderFolderInfo folderInfo =findOrMakeFolder(sBgFolders, container);folderInfo.add(info);break;}sBgItemsIdMap.put(info.id, info);// now that we've loaded everthing re-save it with the// icon in case it disappears somehow.queueIconToBeChecked(sBgDbIconCache, info, c, iconIndex);} else {throw new RuntimeException("Unexpected null ShortcutInfo");}break;case LauncherSettings.Favorites.ITEM_TYPE_FOLDER:id = c.getLong(idIndex);FolderInfo folderInfo = findOrMakeFolder(sBgFolders, id);folderInfo.title = c.getString(titleIndex);folderInfo.id = id;container = c.getInt(containerIndex);folderInfo.container = container;folderInfo.screenId = c.getInt(screenIndex);folderInfo.cellX = c.getInt(cellXIndex);folderInfo.cellY = c.getInt(cellYIndex);folderInfo.spanX = 1;folderInfo.spanY = 1;// Skip loading items that are out of boundsif (container == LauncherSettings.Favorites.CONTAINER_DESKTOP) {if (checkItemDimensions(folderInfo)) {Log.d(TAG, "Skipped loading out of bounds folder");continue;}}// check & update map of what's occupieddeleteOnItemOverlap.set(false);if (!checkItemPlacement(occupied, folderInfo,deleteOnItemOverlap)) {if (deleteOnItemOverlap.get()) {itemsToRemove.add(id);}break;}switch (container) {case LauncherSettings.Favorites.CONTAINER_DESKTOP:case LauncherSettings.Favorites.CONTAINER_HOTSEAT:sBgWorkspaceItems.add(folderInfo);break;}sBgItemsIdMap.put(folderInfo.id, folderInfo);sBgFolders.put(folderInfo.id, folderInfo);break;case LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET:// Read all Launcher-specific widget detailsint appWidgetId = c.getInt(appWidgetIdIndex);String savedProvider = c.getString(appWidgetProviderIndex);id = c.getLong(idIndex);final AppWidgetProviderInfo provider =widgets.getAppWidgetInfo(appWidgetId);if (!isSafeMode && (provider == null || provider.provider == null ||provider.provider.getPackageName() == null)) {String log = "Deleting widget that isn't installed anymore: id="+ id + " appWidgetId=" + appWidgetId;Log.e(TAG, log);Launcher.addDumpLog(TAG, log, false);itemsToRemove.add(id);} else {appWidgetInfo = new LauncherAppWidgetInfo(appWidgetId,provider.provider);appWidgetInfo.id = id;appWidgetInfo.screenId = c.getInt(screenIndex);appWidgetInfo.cellX = c.getInt(cellXIndex);appWidgetInfo.cellY = c.getInt(cellYIndex);appWidgetInfo.spanX = c.getInt(spanXIndex);appWidgetInfo.spanY = c.getInt(spanYIndex);int[] minSpan = Launcher.getMinSpanForWidget(context, provider);appWidgetInfo.minSpanX = minSpan[0];appWidgetInfo.minSpanY = minSpan[1];container = c.getInt(containerIndex);if (container != LauncherSettings.Favorites.CONTAINER_DESKTOP &&container != LauncherSettings.Favorites.CONTAINER_HOTSEAT) {Log.e(TAG, "Widget found where container != " +"CONTAINER_DESKTOP nor CONTAINER_HOTSEAT - ignoring!");continue;}appWidgetInfo.container = c.getInt(containerIndex);// Skip loading items that are out of boundsif (container == LauncherSettings.Favorites.CONTAINER_DESKTOP) {if (checkItemDimensions(appWidgetInfo)) {Log.d(TAG, "Skipped loading out of bounds app widget");continue;}}// check & update map of what's occupieddeleteOnItemOverlap.set(false);if (!checkItemPlacement(occupied, appWidgetInfo,deleteOnItemOverlap)) {if (deleteOnItemOverlap.get()) {itemsToRemove.add(id);}break;}String providerName = provider.provider.flattenToString();if (!providerName.equals(savedProvider)) {ContentValues values = new ContentValues();values.put(LauncherSettings.Favorites.APPWIDGET_PROVIDER,providerName);String where = BaseColumns._ID + "= ?";String[] args = {Integer.toString(c.getInt(idIndex))};contentResolver.update(contentUri, values, where, args);}sBgItemsIdMap.put(appWidgetInfo.id, appWidgetInfo);sBgAppWidgets.add(appWidgetInfo);}break;}} catch (Exception e) {Launcher.addDumpLog(TAG, "Desktop items loading interrupted: " + e, true);}}} finally {if (c != null) {c.close();}}// Break early if we've stopped loadingif (mStopped) {clearSBgDataStructures();return false;}if (itemsToRemove.size() > 0) {ContentProviderClient client = contentResolver.acquireContentProviderClient(LauncherSettings.Favorites.CONTENT_URI);// Remove dead itemsfor (long id : itemsToRemove) {if (DEBUG_LOADERS) {Log.d(TAG, "Removed id = " + id);}// Don't notify content observerstry {client.delete(LauncherSettings.Favorites.getContentUri(id, false),null, null);} catch (RemoteException e) {Log.w(TAG, "Could not remove id = " + id);}}}if (loadedOldDb) {long maxScreenId = 0;// If we're importing we use the old screen order.for (ItemInfo item: sBgItemsIdMap.values()) {long screenId = item.screenId;if (item.container == LauncherSettings.Favorites.CONTAINER_DESKTOP &&!sBgWorkspaceScreens.contains(screenId)) {sBgWorkspaceScreens.add(screenId);if (screenId > maxScreenId) {maxScreenId = screenId;}}}Collections.sort(sBgWorkspaceScreens);LauncherAppState.getLauncherProvider().updateMaxScreenId(maxScreenId);updateWorkspaceScreenOrder(context, sBgWorkspaceScreens);// Update the max item id after we load an old dblong maxItemId = 0;// If we're importing we use the old screen order.for (ItemInfo item: sBgItemsIdMap.values()) {maxItemId = Math.max(maxItemId, item.id);}LauncherAppState.getLauncherProvider().updateMaxItemId(maxItemId);} else {TreeMap<Integer, Long> orderedScreens = loadWorkspaceScreensDb(mContext);for (Integer i : orderedScreens.keySet()) {sBgWorkspaceScreens.add(orderedScreens.get(i));}// Remove any empty screensArrayList<Long> unusedScreens = new ArrayList<Long>(sBgWorkspaceScreens);for (ItemInfo item: sBgItemsIdMap.values()) {long screenId = item.screenId;if (item.container == LauncherSettings.Favorites.CONTAINER_DESKTOP &&unusedScreens.contains(screenId)) {unusedScreens.remove(screenId);}}// If there are any empty screens remove them, and update.if (unusedScreens.size() != 0) {sBgWorkspaceScreens.removeAll(unusedScreens);updateWorkspaceScreenOrder(context, sBgWorkspaceScreens);}}if (DEBUG_LOADERS) {Log.d(TAG, "loaded workspace in " + (SystemClock.uptimeMillis()-t) + "ms");Log.d(TAG, "workspace layout: ");int nScreens = occupied.size();for (int y = 0; y < countY; y++) {String line = "";Iterator<Long> iter = occupied.keySet().iterator();while (iter.hasNext()) {long screenId = iter.next();if (screenId > 0) {line += " | ";}for (int x = 0; x < countX; x++) {line += ((occupied.get(screenId)[x][y] != null) ? "#" : ".");}}Log.d(TAG, "[ " + line + " ]");}}}return loadedOldDb;}这个方法也太长了，挑重点的看吧：final Cursor c = contentResolver.query(contentUri, null, null, null, null);查询数据库
final int idIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites._ID);final int intentIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.INTENT);final int titleIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.TITLE);final int iconTypeIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.ICON_TYPE);final int iconIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.ICON);final int iconPackageIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.ICON_PACKAGE);final int iconResourceIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.ICON_RESOURCE);final int containerIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.CONTAINER);final int itemTypeIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.ITEM_TYPE);final int appWidgetIdIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.APPWIDGET_ID);final int appWidgetProviderIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.APPWIDGET_PROVIDER);final int screenIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.SCREEN);final int cellXIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.CELLX);final int cellYIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.CELLY);final int spanXIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.SPANX);final int spanYIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.SPANY);通过Cursor 拿到应用的信息
while (!mStopped && c.moveToNext()) {AtomicBoolean deleteOnItemOverlap = new AtomicBoolean(false);try {int itemType = c.getInt(itemTypeIndex);switch (itemType) {case LauncherSettings.Favorites.ITEM_TYPE_APPLICATION:case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:id = c.getLong(idIndex);intentDescription = c.getString(intentIndex);try {intent = Intent.parseUri(intentDescription, 0);ComponentName cn = intent.getComponent();if (cn != null && !isValidPackageComponent(manager, cn)) {if (!mAppsCanBeOnRemoveableStorage) {// Log the invalid package, and remove it from the dbLauncher.addDumpLog(TAG, "Invalid package removed: " + cn, true);itemsToRemove.add(id);} else {// If apps can be on external storage, then we just// leave them for the user to remove (maybe add// visual treatment to it)Launcher.addDumpLog(TAG, "Invalid package found: " + cn, true);}continue;}} catch (URISyntaxException e) {Launcher.addDumpLog(TAG, "Invalid uri: " + intentDescription, true);continue;}if (itemType == LauncherSettings.Favorites.ITEM_TYPE_APPLICATION) {info = getShortcutInfo(manager, intent, context, c, iconIndex,titleIndex, mLabelCache);} else {info = getShortcutInfo(c, context, iconTypeIndex,iconPackageIndex, iconResourceIndex, iconIndex,titleIndex);// App shortcuts that used to be automatically added to Launcher// didn't always have the correct intent flags set, so do that// hereif (intent.getAction() != null &&intent.getCategories() != null &&intent.getAction().equals(Intent.ACTION_MAIN) &&intent.getCategories().contains(Intent.CATEGORY_LAUNCHER)) {intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK |Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);}}if (info != null) {info.id = id;info.intent = intent;container = c.getInt(containerIndex);info.container = container;info.screenId = c.getInt(screenIndex);info.cellX = c.getInt(cellXIndex);info.cellY = c.getInt(cellYIndex);info.spanX = 1;info.spanY = 1;// Skip loading items that are out of boundsif (container == LauncherSettings.Favorites.CONTAINER_DESKTOP) {if (checkItemDimensions(info)) {Launcher.addDumpLog(TAG, "Skipped loading out of bounds shortcut: "+ info + ", " + grid.numColumns + "x" + grid.numRows, true);continue;}}// check & update map of what's occupieddeleteOnItemOverlap.set(false);if (!checkItemPlacement(occupied, info, deleteOnItemOverlap)) {if (deleteOnItemOverlap.get()) {itemsToRemove.add(id);}break;}switch (container) {case LauncherSettings.Favorites.CONTAINER_DESKTOP:case LauncherSettings.Favorites.CONTAINER_HOTSEAT:sBgWorkspaceItems.add(info);break;default:// Item is in a user folderFolderInfo folderInfo =findOrMakeFolder(sBgFolders, container);folderInfo.add(info);break;}sBgItemsIdMap.put(info.id, info);// now that we've loaded everthing re-save it with the// icon in case it disappears somehow.queueIconToBeChecked(sBgDbIconCache, info, c, iconIndex);} else {throw new RuntimeException("Unexpected null ShortcutInfo");}break;case LauncherSettings.Favorites.ITEM_TYPE_FOLDER:id = c.getLong(idIndex);FolderInfo folderInfo = findOrMakeFolder(sBgFolders, id);folderInfo.title = c.getString(titleIndex);folderInfo.id = id;container = c.getInt(containerIndex);folderInfo.container = container;folderInfo.screenId = c.getInt(screenIndex);folderInfo.cellX = c.getInt(cellXIndex);folderInfo.cellY = c.getInt(cellYIndex);folderInfo.spanX = 1;folderInfo.spanY = 1;// Skip loading items that are out of boundsif (container == LauncherSettings.Favorites.CONTAINER_DESKTOP) {if (checkItemDimensions(folderInfo)) {Log.d(TAG, "Skipped loading out of bounds folder");continue;}}// check & update map of what's occupieddeleteOnItemOverlap.set(false);if (!checkItemPlacement(occupied, folderInfo,deleteOnItemOverlap)) {if (deleteOnItemOverlap.get()) {itemsToRemove.add(id);}break;}switch (container) {case LauncherSettings.Favorites.CONTAINER_DESKTOP:case LauncherSettings.Favorites.CONTAINER_HOTSEAT:sBgWorkspaceItems.add(folderInfo);break;}sBgItemsIdMap.put(folderInfo.id, folderInfo);sBgFolders.put(folderInfo.id, folderInfo);break;case LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET:// Read all Launcher-specific widget detailsint appWidgetId = c.getInt(appWidgetIdIndex);String savedProvider = c.getString(appWidgetProviderIndex);id = c.getLong(idIndex);final AppWidgetProviderInfo provider =widgets.getAppWidgetInfo(appWidgetId);if (!isSafeMode && (provider == null || provider.provider == null ||provider.provider.getPackageName() == null)) {String log = "Deleting widget that isn't installed anymore: id="+ id + " appWidgetId=" + appWidgetId;Log.e(TAG, log);Launcher.addDumpLog(TAG, log, false);itemsToRemove.add(id);} else {appWidgetInfo = new LauncherAppWidgetInfo(appWidgetId,provider.provider);appWidgetInfo.id = id;appWidgetInfo.screenId = c.getInt(screenIndex);appWidgetInfo.cellX = c.getInt(cellXIndex);appWidgetInfo.cellY = c.getInt(cellYIndex);appWidgetInfo.spanX = c.getInt(spanXIndex);appWidgetInfo.spanY = c.getInt(spanYIndex);int[] minSpan = Launcher.getMinSpanForWidget(context, provider);appWidgetInfo.minSpanX = minSpan[0];appWidgetInfo.minSpanY = minSpan[1];container = c.getInt(containerIndex);if (container != LauncherSettings.Favorites.CONTAINER_DESKTOP &&container != LauncherSettings.Favorites.CONTAINER_HOTSEAT) {Log.e(TAG, "Widget found where container != " +"CONTAINER_DESKTOP nor CONTAINER_HOTSEAT - ignoring!");continue;}appWidgetInfo.container = c.getInt(containerIndex);// Skip loading items that are out of boundsif (container == LauncherSettings.Favorites.CONTAINER_DESKTOP) {if (checkItemDimensions(appWidgetInfo)) {Log.d(TAG, "Skipped loading out of bounds app widget");continue;}}// check & update map of what's occupieddeleteOnItemOverlap.set(false);if (!checkItemPlacement(occupied, appWidgetInfo,deleteOnItemOverlap)) {if (deleteOnItemOverlap.get()) {itemsToRemove.add(id);}break;}String providerName = provider.provider.flattenToString();if (!providerName.equals(savedProvider)) {ContentValues values = new ContentValues();values.put(LauncherSettings.Favorites.APPWIDGET_PROVIDER,providerName);String where = BaseColumns._ID + "= ?";String[] args = {Integer.toString(c.getInt(idIndex))};contentResolver.update(contentUri, values, where, args);}sBgItemsIdMap.put(appWidgetInfo.id, appWidgetInfo);sBgAppWidgets.add(appWidgetInfo);}break;}} catch (Exception e) {Launcher.addDumpLog(TAG, "Desktop items loading interrupted: " + e, true);}}通过拿到的应用信息，然后判断itemType分别给是加载快捷方式还是具体的应用，是桌面还是hotseat上的数据，
将信息塞给getShortcutInfo(manager, intent, context, c, iconIndex, titleIndex, mLabelCache);生成ShortcutInfo，在判断info！= null将数据分类到哪一个container，哪一个文件夹，
继续回到loadAndBindWorkspace（）方法：查询分类完成之后就是绑定信息：
private void bindWorkspace(int synchronizeBindPage, final boolean isUpgradePath) {final long t = SystemClock.uptimeMillis();Runnable r;// Don't use these two variables in any of the callback runnables.// Otherwise we hold a reference to them.final Callbacks oldCallbacks = mCallbacks.get();if (oldCallbacks == null) {// This launcher has exited and nobody bothered to tell us. Just bail.Log.w(TAG, "LoaderTask running with no launcher");return;}final boolean isLoadingSynchronously = (synchronizeBindPage > -1);final int currentScreen = isLoadingSynchronously ? synchronizeBindPage :oldCallbacks.getCurrentWorkspaceScreen();// Load all the items that are on the current page first (and in the process, unbind// all the existing workspace items before we call startBinding() below.unbindWorkspaceItemsOnMainThread();ArrayList<ItemInfo> workspaceItems = new ArrayList<ItemInfo>();ArrayList<LauncherAppWidgetInfo> appWidgets =new ArrayList<LauncherAppWidgetInfo>();HashMap<Long, FolderInfo> folders = new HashMap<Long, FolderInfo>();HashMap<Long, ItemInfo> itemsIdMap = new HashMap<Long, ItemInfo>();ArrayList<Long> orderedScreenIds = new ArrayList<Long>();synchronized (sBgLock) {workspaceItems.addAll(sBgWorkspaceItems);appWidgets.addAll(sBgAppWidgets);folders.putAll(sBgFolders);itemsIdMap.putAll(sBgItemsIdMap);orderedScreenIds.addAll(sBgWorkspaceScreens);}ArrayList<ItemInfo> currentWorkspaceItems = new ArrayList<ItemInfo>();ArrayList<ItemInfo> otherWorkspaceItems = new ArrayList<ItemInfo>();ArrayList<LauncherAppWidgetInfo> currentAppWidgets =new ArrayList<LauncherAppWidgetInfo>();ArrayList<LauncherAppWidgetInfo> otherAppWidgets =new ArrayList<LauncherAppWidgetInfo>();HashMap<Long, FolderInfo> currentFolders = new HashMap<Long, FolderInfo>();HashMap<Long, FolderInfo> otherFolders = new HashMap<Long, FolderInfo>();// Separate the items that are on the current screen, and all the other remaining itemsfilterCurrentWorkspaceItems(currentScreen, workspaceItems, currentWorkspaceItems,otherWorkspaceItems);filterCurrentAppWidgets(currentScreen, appWidgets, currentAppWidgets,otherAppWidgets);filterCurrentFolders(currentScreen, itemsIdMap, folders, currentFolders,otherFolders);sortWorkspaceItemsSpatially(currentWorkspaceItems);sortWorkspaceItemsSpatially(otherWorkspaceItems);// Tell the workspace that we're about to start binding itemsr = new Runnable() {public void run() {Callbacks callbacks = tryGetCallbacks(oldCallbacks);if (callbacks != null) {callbacks.startBinding();}}};runOnMainThread(r, MAIN_THREAD_BINDING_RUNNABLE);bindWorkspaceScreens(oldCallbacks, orderedScreenIds);// Load items on the current pagebindWorkspaceItems(oldCallbacks, currentWorkspaceItems, currentAppWidgets,currentFolders, null);if (isLoadingSynchronously) {r = new Runnable() {public void run() {Callbacks callbacks = tryGetCallbacks(oldCallbacks);if (callbacks != null) {callbacks.onPageBoundSynchronously(currentScreen);}}};runOnMainThread(r, MAIN_THREAD_BINDING_RUNNABLE);}// Load all the remaining pages (if we are loading synchronously, we want to defer this// work until after the first render)mDeferredBindRunnables.clear();bindWorkspaceItems(oldCallbacks, otherWorkspaceItems, otherAppWidgets, otherFolders,(isLoadingSynchronously ? mDeferredBindRunnables : null));// Tell the workspace that we're done binding itemsr = new Runnable() {public void run() {Callbacks callbacks = tryGetCallbacks(oldCallbacks);if (callbacks != null) {callbacks.finishBindingItems(isUpgradePath);}// If we're profiling, ensure this is the last thing in the queue.if (DEBUG_LOADERS) {Log.d(TAG, "bound workspace in "+ (SystemClock.uptimeMillis()-t) + "ms");}mIsLoadingAndBindingWorkspace = false;}};if (isLoadingSynchronously) {mDeferredBindRunnables.add(r);} else {runOnMainThread(r, MAIN_THREAD_BINDING_RUNNABLE);}}看到里面这么多集合是干什么用的;就是将不同的分类放到不同的集合在加入不同信息，维护六个集合，r = new Runnable() {public void run() {Callbacks callbacks = tryGetCallbacks(oldCallbacks);if (callbacks != null) {callbacks.startBinding();}}};runOnMainThread(r, MAIN_THREAD_BINDING_RUNNABLE);
```
注册监听，开始绑定了：进去看看public void startBinding() {
// If we’re starting binding all over again, clear any bind calls we’d postponed in
// the past (see waitUntilResume) – we don’t need them since we’re starting binding
// from scratch again
mBindOnResumeCallbacks.clear();
// Clear the workspace because it's going to be reboundmWorkspace.clearDropTargets();mWorkspace.removeAllWorkspaceScreens();mWidgetsToAdvance.clear();if (mHotseat != null) {mHotseat.resetLayout();}
}就是对view的清空，
然后 bindWorkspaceItems(oldCallbacks, currentWorkspaceItems, currentAppWidgets,currentFolders, null);加载当前页的item；跟到这个方法里面去就看到 if (callbacks != null) {callbacks.bindItems(workspaceItems, start, start+chunkSize, false);}
就看到了bindItems，就到Launcher里面回调，public void bindAppsAdded(final ArrayList newScreens,
final ArrayList addNotAnimated,
final ArrayList addAnimated,
final ArrayList addedApps) {
Runnable r = new Runnable() {
public void run() {
bindAppsAdded(newScreens, addNotAnimated, addAnimated, addedApps);
}
};
if (waitUntilResume(r)) {
return;
}
// Add the new screensbindAddScreens(newScreens);// We add the items without animation on non-visible pages, and with// animations on the new page (which we will try and snap to).if (!addNotAnimated.isEmpty()) {bindItems(addNotAnimated, 0,addNotAnimated.size(), false);}if (!addAnimated.isEmpty()) {bindItems(addAnimated, 0,addAnimated.size(), true);}// Remove the extra empty screenmWorkspace.removeExtraEmptyScreen();if (!AppsCustomizePagedView.DISABLE_ALL_APPS &&addedApps != null && mAppsCustomizeContent != null) {mAppsCustomizeContent.addApps(addedApps);}
}
看到bindItems了那就是要绑定数据了最终会调用workspace的addInScreenFromBind（）void addInScreenFromBind(View child, long container, long screenId, int x, int y,int spanX, int spanY) {addInScreen(child, container, screenId, x, y, spanX, spanY, false, true);}就加载到屏幕上了；“`
r = new Runnable() {public void run() {Callbacks callbacks = tryGetCallbacks(oldCallbacks);if (callbacks != null) {callbacks.finishBindingItems(isUpgradePath);}// If we're profiling, ensure this is the last thing in the queue.if (DEBUG_LOADERS) {Log.d(TAG, "bound workspace in "+ (SystemClock.uptimeMillis()-t) + "ms");}mIsLoadingAndBindingWorkspace = false;}};if (isLoadingSynchronously) {mDeferredBindRunnables.add(r);} else {runOnMainThread(r, MAIN_THREAD_BINDING_RUNNABLE);}finishBindingItems注册一个callback，Launcher实现，就是加载数据完成之后做的操作！
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