Launcher3应用列表数据加载_launcherapps.getactivitylist

本文我们详细看看应用列表的加载过程，代码是基于高通7.1。先前的文章我们分析过Launcher3数据的加载，知道应用列表数据加载的起点是在LauncherModel的loadAndBindAllApps()开始的,该方法会调用loadAllApps()。

packages\apps\Launcher3\src\com\android\launcher3\LauncherModel.java
        private void loadAllApps() {
            ...
            mBgAllAppsList.clear();
            for (UserHandleCompat user : profiles) {
                // Query for the set of apps
                final long qiaTime = DEBUG_LOADERS ? SystemClock.uptimeMillis() : 0;
                final List<LauncherActivityInfoCompat> apps = mLauncherApps.getActivityList(null, user);
                if (DEBUG_LOADERS) {
                    Log.d(TAG, "getActivityList took "
                            + (SystemClock.uptimeMillis()-qiaTime) + "ms for user " + user);
                    Log.d(TAG, "getActivityList got " + apps.size() + " apps for user " + user);
                }
                // Fail if we don't have any apps
                // TODO: Fix this. Only fail for the current user.
                if (apps == null || apps.isEmpty()) {
                    return;
                }
                boolean quietMode = mUserManager.isQuietModeEnabled(user);
                // Create the ApplicationInfos
                for (int i = 0; i < apps.size(); i++) {
                    LauncherActivityInfoCompat app = apps.get(i);
                    // This builds the icon bitmaps.
                    mBgAllAppsList.add(new AppInfo(mContext, app, user, mIconCache, quietMode));
                }
                ...
            }
            // Huh? Shouldn't this be inside the Runnable below?
            final ArrayList<AppInfo> added = mBgAllAppsList.added;
            mBgAllAppsList.added = new ArrayList<AppInfo>();
 
            // Post callback on main thread
            mHandler.post(new Runnable() {
                public void run() {
 
                    final long bindTime = SystemClock.uptimeMillis();
                    final Callbacks callbacks = tryGetCallbacks(oldCallbacks);
                    if (callbacks != null) {
                        callbacks.bindAllApplications(added);
                        if (DEBUG_LOADERS) {
                            Log.d(TAG, "bound " + added.size() + " apps in "
                                    + (SystemClock.uptimeMillis() - bindTime) + "ms");
                        }
                    } else {
                        Log.i(TAG, "not binding apps: no Launcher activity");
                    }
                }
            });
            ...
        }

函数中调用LauncherAppsCompat.java的getActivityList方法获取所有安装的应用。LauncherAppsCompat是一个抽象类，不同的android版本有不同的处理方式。

//Lollipop之前的版本
packages\apps\Launcher3\src\com\android\launcher3\compat\LauncherAppsCompatV16.java
    public List<LauncherActivityInfoCompat> getActivityList(String packageName,
            UserHandleCompat user) {
        final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
        mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
        mainIntent.setPackage(packageName);
        List<ResolveInfo> infos = mPm.queryIntentActivities(mainIntent, 0);
        List<LauncherActivityInfoCompat> list =
                new ArrayList<LauncherActivityInfoCompat>(infos.size());
        for (ResolveInfo info : infos) {
            list.add(new LauncherActivityInfoCompatV16(mContext, info));
        }
        return list;
    }
//以下为Lollipop之后的版本，获取应用的流程
packages\apps\Launcher3\src\com\android\launcher3\compat\LauncherAppsCompatVL.java
    public List<LauncherActivityInfoCompat> getActivityList(String packageName,
            UserHandleCompat user) {
        List<LauncherActivityInfo> list = mLauncherApps.getActivityList(packageName,
                user.getUser());
        if (list.size() == 0) {
            return Collections.emptyList();
        }
        ArrayList<LauncherActivityInfoCompat> compatList =
                new ArrayList<LauncherActivityInfoCompat>(list.size());
        for (LauncherActivityInfo info : list) {
            compatList.add(new LauncherActivityInfoCompatVL(info));
        }
        return compatList;
    }
frameworks\base\core\java\android\content\pm\LauncherApps.java
    public List<LauncherActivityInfo> getActivityList(String packageName, UserHandle user) {
        logErrorForInvalidProfileAccess(user);
        try {
            return convertToActivityList(mService.getLauncherActivities(mContext.getPackageName(),
                    packageName, user), user);
        } catch (RemoteException re) {
            throw re.rethrowFromSystemServer();
        }
    }
 
frameworks\base\services\core\java\com\android\server\pm\LauncherAppsService.java
    @Override
    public ParceledListSlice<ResolveInfo> getLauncherActivities(String callingPackage,
                String packageName, UserHandle user)
                throws RemoteException {
            return queryActivitiesForUser(callingPackage,
                    new Intent(Intent.ACTION_MAIN)
                            .addCategory(Intent.CATEGORY_LAUNCHER)
                            .setPackage(packageName),
                    user);
        }

可以看到最终还是通过PackageManagerService查询出所有安装的应用。之后对mBgAllAppsList填充数据，回调Launcher3的bindAllApplications方法。而该方法只是简单调用了mAppsView.setApps(apps)，并没有数据更新时，那个我们常见的Adapter.notifyDataSetChanged()方法调用。别急，我们慢慢来分析，setApps之后做了很多工作，其中比较重要的方法就是

packages\apps\Launcher3\src\com\android\launcher3\allapps\AlphabeticalAppsList.java
   /**
     * Updates internals when the set of apps are updated.
     */
    private void onAppsUpdated() {
        // Sort the list of apps
        mApps.clear();
        mApps.addAll(mComponentToAppMap.values());
        Collections.sort(mApps, mAppNameComparator.getAppInfoComparator());
        // As a special case for some languages (currently only Simplified Chinese), we may need to
        // coalesce sections
        Locale curLocale = mLauncher.getResources().getConfiguration().locale;
        TreeMap<String, ArrayList<AppInfo>> sectionMap = null;
        boolean localeRequiresSectionSorting = curLocale.equals(Locale.SIMPLIFIED_CHINESE);
        if (localeRequiresSectionSorting) {
            // Compute the section headers.  We use a TreeMap with the section name comparator to
            // ensure that the sections are ordered when we iterate over it later
            sectionMap = new TreeMap<>(mAppNameComparator.getSectionNameComparator());
            for (AppInfo info : mApps) {
                // Add the section to the cache
                String sectionName = getAndUpdateCachedSectionName(info.title);
 
                // Add it to the mapping
                ArrayList<AppInfo> sectionApps = sectionMap.get(sectionName);
                if (sectionApps == null) {
                    sectionApps = new ArrayList<>();
                    sectionMap.put(sectionName, sectionApps);
                }
                sectionApps.add(info);
            }
 
            // Add each of the section apps to the list in order
            List<AppInfo> allApps = new ArrayList<>(mApps.size());
            for (Map.Entry<String, ArrayList<AppInfo>> entry : sectionMap.entrySet()) {
                allApps.addAll(entry.getValue());
            }
 
            mApps.clear();
            mApps.addAll(allApps);
        } else {
            // Just compute the section headers for use below
            for (AppInfo info : mApps) {
                // Add the section to the cache
                getAndUpdateCachedSectionName(info.title);
            }
        }
 
        // Recompose the set of adapter items from the current set of apps
        updateAdapterItems();
    }

一大段的代码都是对mApps进行排序。先按title来排序，如果title一样再对componentName排序，如果是中文则用AlphabeticIndex类来进行处理。具体的就请大家自行看下代码了。我们来看一下最后的updateAdapterItems调用。

packages\apps\Launcher3\src\com\android\launcher3\allapps\AlphabeticalAppsList.java
    private void updateAdapterItems() {
        SectionInfo lastSectionInfo = null;
        String lastSectionName = null;
        FastScrollSectionInfo lastFastScrollerSectionInfo = null;
        int position = 0;
        int appIndex = 0;
 
        // Prepare to update the list of sections, filtered apps, etc.
        mFilteredApps.clear();
        mFastScrollerSections.clear();
        mAdapterItems.clear();
        mSections.clear();
 
        if (DEBUG_PREDICTIONS) {
            if (mPredictedAppComponents.isEmpty() && !mApps.isEmpty()) {
                mPredictedAppComponents.add(new ComponentKey(mApps.get(0).componentName,
                        UserHandleCompat.myUserHandle()));
                mPredictedAppComponents.add(new ComponentKey(mApps.get(0).componentName,
                        UserHandleCompat.myUserHandle()));
                mPredictedAppComponents.add(new ComponentKey(mApps.get(0).componentName,
                        UserHandleCompat.myUserHandle()));
                mPredictedAppComponents.add(new ComponentKey(mApps.get(0).componentName,
                        UserHandleCompat.myUserHandle()));
            }
        }
 
        // Add the search divider
        mAdapterItems.add(AdapterItem.asSearchDivder(position++));
 
        // Process the predicted app components
        mPredictedApps.clear();
        if (mPredictedAppComponents != null && !mPredictedAppComponents.isEmpty() && !hasFilter()) {
            for (ComponentKey ck : mPredictedAppComponents) {
                AppInfo info = mComponentToAppMap.get(ck);
                if (info != null) {
                    mPredictedApps.add(info);
                } else {
                    if (ProviderConfig.IS_DOGFOOD_BUILD) {
                        Log.e(TAG, "Predicted app not found: " + ck);
                    }
                }
                // Stop at the number of predicted apps
                if (mPredictedApps.size() == mNumPredictedAppsPerRow) {
                    break;
                }
            }
 
            if (!mPredictedApps.isEmpty()) {
                // Add a section for the predictions
                lastSectionInfo = new SectionInfo();
                lastFastScrollerSectionInfo = new FastScrollSectionInfo("");
                AdapterItem sectionItem = AdapterItem.asSectionBreak(position++, lastSectionInfo);
                mSections.add(lastSectionInfo);
                mFastScrollerSections.add(lastFastScrollerSectionInfo);
                mAdapterItems.add(sectionItem);
 
                // Add the predicted app items
                for (AppInfo info : mPredictedApps) {
                    AdapterItem appItem = AdapterItem.asPredictedApp(position++, lastSectionInfo,
                            "", lastSectionInfo.numApps++, info, appIndex++);
                    if (lastSectionInfo.firstAppItem == null) {
                        lastSectionInfo.firstAppItem = appItem;
                        lastFastScrollerSectionInfo.fastScrollToItem = appItem;
                    }
                    mAdapterItems.add(appItem);
                    mFilteredApps.add(info);
                }
 
                mAdapterItems.add(AdapterItem.asPredictionDivider(position++));
            }
        }
 
        // Recreate the filtered and sectioned apps (for convenience for the grid layout) from the
        // ordered set of sections
        for (AppInfo info : getFiltersAppInfos()) {
            String sectionName = getAndUpdateCachedSectionName(info.title);
 
            // Create a new section if the section names do not match
            if (lastSectionInfo == null || !sectionName.equals(lastSectionName)) {
                lastSectionName = sectionName;
                lastSectionInfo = new SectionInfo();
                lastFastScrollerSectionInfo = new FastScrollSectionInfo(sectionName);
                mSections.add(lastSectionInfo);
                mFastScrollerSections.add(lastFastScrollerSectionInfo);
 
                // Create a new section item to break the flow of items in the list
                if (!hasFilter()) {
                    AdapterItem sectionItem = AdapterItem.asSectionBreak(position++, lastSectionInfo);
                    mAdapterItems.add(sectionItem);
                }
            }
 
            // Create an app item
            AdapterItem appItem = AdapterItem.asApp(position++, lastSectionInfo, sectionName,
                    lastSectionInfo.numApps++, info, appIndex++);
            if (lastSectionInfo.firstAppItem == null) {
                lastSectionInfo.firstAppItem = appItem;
                lastFastScrollerSectionInfo.fastScrollToItem = appItem;
            }
            mAdapterItems.add(appItem);
            mFilteredApps.add(info);
        }
 
        // Append the search market item if we are currently searching
        if (hasFilter()) {
            if (hasNoFilteredResults()) {
                mAdapterItems.add(AdapterItem.asEmptySearch(position++));
            } else {
                mAdapterItems.add(AdapterItem.asMarketDivider(position++));
            }
            mAdapterItems.add(AdapterItem.asMarketSearch(position++));
        }
 
        // Merge multiple sections together as requested by the merge strategy for this device
        mergeSections();
        ...
        // Refresh the recycler view
        if (mAdapter != null) {
            mAdapter.notifyDataSetChanged();
        }
    }

代码很长，耐心多看几遍就可以理解。mPredictedApps是预测apk,就是使用最频繁的几个apk,如果有就先加入到mAdapterItems中;然后就是getFiltersAppInfos(),如果我们正在搜索某个apk,如果关键字匹配，就会返回匹配关键字的所有apk,函数中有一个mSearchResults变量可以用来判断是否正处于搜索状态。如果这个为空则表示不在搜索，此时直接返回排好序的mApps列表。当然函数里面还有一些分割线的相关处理，我们对照下界面布局效果就更好理解。准备好mAdapterItems数据，直接调用我们希望调用的notifyDataSetChanged刷新应用列表。

本文就写到这里了，有不对的地方还请大家评论指出。