标签： androidSourceCode界面
2017-04-20 18:15 1066人阅读 收藏 举报
新人一枚，没有整机环境，有什么写的不对欢迎批评指正，万分感谢！
Settings主界面加载时序图（这里很多判断逻辑我省略掉了。更多的是想把加载主界面流程跑通。）
这张流程图将主fragment DashboardSummary启动，RecyclerView数据加载刷新 显示得较为明白。但是对于主界面tile分类，tile排序，tile对象属性是无法得知的。所以接下我就主要讲讲这两个。
（1）先看一下主界面布局（用绘图画的，比较丑见谅）
这里有一个值得学习的是RecycleView分类加载不同的布局，值得学习。方法在DashboardAdapter.Java里面。
主界面对象介绍：
（1）主界面（除了Suggestion，condition）其他对象都在List<DashBoardCagtory> Categories里面
（2） Categories 有 4个对象。4个DashBoardCagtory的title值分别是 Wireless&networks，Device，Personal，System
（3）各个Cagtories都有List<Tile> tiles 是各个DashBoardCagtorytitle下面各个tile的集合
组装这些对象是时序图中方法4，5，6，7，8。
5 getTilesForAction
（1）组装Intent对象
（2）调用方法6
- private static void getTilesForAction(Context context,
- UserHandle user, String action, Map<Pair<String, String>, Tile> addedCache,
- String defaultCategory, ArrayList<Tile> outTiles, boolean requireSettings) {
- Intent intent = new Intent(action);
- if (requireSettings) {
- intent.setPackage(SETTING_PKG);
- }
- getTilesForIntent(context, user, intent, addedCache, defaultCategory, outTiles,
- requireSettings, true);
- }
6 getTilesForIntent
（1）利用PM查询所有含有方法5生成的intent对象的ResolveInfo集合
（2）获取集合中每一个Acitvity manifest配置的meta标签name为SETTINGS_ACTION的value值
（3）把activity name 和package 生成Intent对象
（4）将2步骤的值赋值给Tile category
（5）获取action为SETTINGS_ACTION的intent-filter的priority属性
（6）将解析meta-data标签的bundle数据赋值给Tile metaData
- public static void getTilesForIntent(Context context, UserHandle user, Intent intent,
- Map<Pair<String, String>, Tile> addedCache, String defaultCategory, List<Tile> outTiles,
- boolean usePriority, boolean checkCategory) {
- PackageManager pm = context.getPackageManager();
- List<ResolveInfo> results = pm.queryIntentActivitiesAsUser(intent,
- PackageManager.GET_META_DATA, user.getIdentifier());
- for (ResolveInfo resolved : results) {
- if (!resolved.system) {
- continue;
- }
- ActivityInfo activityInfo = resolved.activityInfo;
- Bundle metaData = activityInfo.metaData;
- String categoryKey = defaultCategory;
- if (checkCategory && ((metaData == null) || !metaData.containsKey(EXTRA_CATEGORY_KEY))
- && categoryKey == null) {
- continue;
- } else {
- categoryKey = metaData.getString(EXTRA_CATEGORY_KEY);
- }
- Pair<String, String> key = new Pair<String, String>(activityInfo.packageName,
- activityInfo.name);
- Tile tile = addedCache.get(key);
- if (tile == null) {
- tile = new Tile();
- tile.intent = new Intent().setClassName(
- activityInfo.packageName, activityInfo.name);
- tile.category = categoryKey;
- tile.priority = usePriority ? resolved.priority : 0;
- tile.metaData = activityInfo.metaData;
- updateTileData(context, tile, activityInfo, activityInfo.applicationInfo,
- pm);
- if (DEBUG) Log.d(LOG_TAG, "Adding tile " + tile.title);
-
- addedCache.put(key, tile);
- }
- if (!tile.userHandle.contains(user)) {
- tile.userHandle.add(user);
- }
- if (!outTiles.contains(tile)) {
- outTiles.add(tile);
- }
- }
- }
7 updateTileData
（1） 解析meta-data标签 获取name为 META_DATA_PREFERENCE_ICON的value值赋值给icon
（2）解析meta-data标签 获取name为 META_DATA_PREFERENCE_TITLE的resource值赋值给title
（3）解析meta-data标签 获取name为 META_DATA_PREFERENCE_SUMMARY的value值赋值给summary
（4）如果title为空就获取acitvity标签label属性赋值给title
（5）如果icon等于0就获取acitvity标签icon属性赋值给icon
- private static boolean updateTileData(Context context, Tile tile,
- ActivityInfo activityInfo, ApplicationInfo applicationInfo, PackageManager pm) {
- if (applicationInfo.isSystemApp()) {
- int icon = 0;
- CharSequence title = null;
- String summary = null;
- try {
- Resources res = pm.getResourcesForApplication(
- applicationInfo.packageName);
- Bundle metaData = activityInfo.metaData;
-
- if (res != null && metaData != null) {
- if (metaData.containsKey(META_DATA_PREFERENCE_ICON)) {
- icon = metaData.getInt(META_DATA_PREFERENCE_ICON);
- }
- if (metaData.containsKey(META_DATA_PREFERENCE_TITLE)) {
- if (metaData.get(META_DATA_PREFERENCE_TITLE) instanceof Integer) {
- title = res.getString(metaData.getInt(META_DATA_PREFERENCE_TITLE));
- } else {
- title = metaData.getString(META_DATA_PREFERENCE_TITLE);
- }
- }
- if (metaData.containsKey(META_DATA_PREFERENCE_SUMMARY)) {
- if (metaData.get(META_DATA_PREFERENCE_SUMMARY) instanceof Integer) {
- summary = res.getString(metaData.getInt(META_DATA_PREFERENCE_SUMMARY));
- } else {
- summary = metaData.getString(META_DATA_PREFERENCE_SUMMARY);
- }
- }
- }
- } catch (PackageManager.NameNotFoundException | Resources.NotFoundException e) {
- if (DEBUG) Log.d(LOG_TAG, "Couldn't find info", e);
- }
- if (TextUtils.isEmpty(title)) {
- title = activityInfo.loadLabel(pm).toString();
- }
- if (icon == 0) {
- icon = activityInfo.icon;
- }
- tile.icon = Icon.createWithResource(activityInfo.packageName, icon);
- tile.title = title;
- tile.summary = summary;
- tile.intent = new Intent().setClassName(activityInfo.packageName,
- activityInfo.name);
-
- return true;
- }
-
- return false;
- }
8 createCategory
（1）创建DashboardCategory对象
（2）利用PM查询所有含有Tile对象categoriyKey生成的intent对象的ResolveInfo集合
（3）把acitivity label值赋值给category title属性
（4）把解析intent-filter标签的priority值赋值给category属性
- private static DashboardCategory createCategory(Context context, String categoryKey) {
- DashboardCategory category = new DashboardCategory();
- category.key = categoryKey;
- PackageManager pm = context.getPackageManager();
- List<ResolveInfo> results = pm.queryIntentActivities(new Intent(categoryKey), 0);
- if (results.size() == 0) {
- return null;
- }
- for (ResolveInfo resolved : results) {
- if (!resolved.system) {
-
- continue;
- }
- category.title = resolved.activityInfo.loadLabel(pm);
- category.priority = SETTING_PKG.equals(
- resolved.activityInfo.applicationInfo.packageName) ? resolved.priority : 0;
- if (DEBUG) Log.d(LOG_TAG, "Adding category " + category.title);
- }
-
- return category;
- }
4 getCategories
（1）调用5
（2）新建categoryMap集合
（3）遍历tiles，判断集合中是否有元素含有tile.category(当时我看见这个觉得google多此一举每次这个对象都是需要new但是我后来整 理manifest发现 含有相同category的tile很多。可以看我下面整理的manifest的表格)。如果没有就执行方法8
（4）将拥有相同属性category的tile加入到对象DashboardCategory category对象的list<tile>集合中（我觉得google写这个自己也蒙 蔽了。两个相同名字， 一个是Tile里面变量，一个是DashboardCategory对象）
（5）将categoryMap的值赋值给List <DashboardCategory>cagtories以便执行排序算法
（6）遍历cagtories利用Collections函数和比较器TILE_COMPARATOR将category.tiles按照priority从大到小排序
（7）利用Collections函数和比较器CATEGORY_COMPARATOR将categories按照priority从大到小排序
- public static List<DashboardCategory> getCategories(Context context,
- HashMap<Pair<String, String>, Tile> cache) {
- final long startTime = System.currentTimeMillis();
- boolean setup = Global.getInt(context.getContentResolver(), Global.DEVICE_PROVISIONED, 0)
- != 0;
- ArrayList<Tile> tiles = new ArrayList<>();
- UserManager userManager = UserManager.get(context);
- for (UserHandle user : userManager.getUserProfiles()) {
-
- if (user.getIdentifier() == ActivityManager.getCurrentUser()) {
-
- getTilesForAction(context, user, SETTINGS_ACTION, cache, null, tiles, true);
- getTilesForAction(context, user, OPERATOR_SETTINGS, cache,
- OPERATOR_DEFAULT_CATEGORY, tiles, false);
- getTilesForAction(context, user, MANUFACTURER_SETTINGS, cache,
- MANUFACTURER_DEFAULT_CATEGORY, tiles, false);
- }
- if (setup) {
- getTilesForAction(context, user, EXTRA_SETTINGS_ACTION, cache, null, tiles, false);
- }
- }
- HashMap<String, DashboardCategory> categoryMap = new HashMap<>();
- for (Tile tile : tiles) {
- DashboardCategory category = categoryMap.get(tile.category);
- if (category == null) {
- category = createCategory(context, tile.category);
- if (category == null) {
- Log.w(LOG_TAG, "Couldn't find category " + tile.category);
- continue;
- }
- categoryMap.put(category.key, category);
- }
- category.addTile(tile);
- }
- ArrayList<DashboardCategory> categories = new ArrayList<>(categoryMap.values());
- for (DashboardCategory category : categories) {
- Collections.sort(category.tiles, TILE_COMPARATOR);
- }
- Collections.sort(categories, CATEGORY_COMPARATOR);
- if (DEBUG_TIMING) Log.d(LOG_TAG, "getCategories took "
- + (System.currentTimeMillis() - startTime) + " ms");
- return categories;
- }
图表：tile
图表：DashboardCategory
问题：summary是无法从manifest文件里面获取的。因为不含有meta-data name属性为“com.android.settings.summary”的标签。summary获取方法是时序图中方法16，17，18，31，32
16 new SummaryLoader
（1） 创建Handler对象（2） 创建异步线程（大家可以去看一下线程优先级，做app还是挺有用处的）
（3） 遍历categories里面每一个DashboardCategory对象里面集合Tiles里面每一个tile对象
（4） 发送消息执行方法17
- public SummaryLoader(Activity activity, List<DashboardCategory> categories) {
- mHandler = new Handler();
- mWorkerThread = new HandlerThread("SummaryLoader", Process.THREAD_PRIORITY_BACKGROUND);
- mWorkerThread.start();
- mWorker = new Worker(mWorkerThread.getLooper());
- mActivity = activity;
- for (int i = 0; i < categories.size(); i++) {
- List<Tile> tiles = categories.get(i).tiles;
- for (int j = 0; j < tiles.size(); j++) {
- Tile tile = tiles.get(j);
- mWorker.obtainMessage(Worker.MSG_GET_PROVIDER, tile).sendToTarget();
- }
- }
- }
17 makeProviderW
（1）执行方法18
（2）将方法18返回的SummaryProvider对象存入到mSummaryMap中
- private synchronized void makeProviderW(Tile tile) {
- SummaryProvider provider = getSummaryProvider(tile);
- if (provider != null) {
- if (DEBUG) Log.d(TAG, "Creating " + tile);
- mSummaryMap.put(provider, tile.intent.getComponent());
- }
- }
18 getSummaryProvider（真的是厉害了，我的歌）
（1）获取title中的meataData变量
（2）将bundle数据metaData键为SettingsActivity.META_DATA_KEY_FRAGMENT的alue值赋值给clsName
（3）根据clsName反射创建class
（4）获取name为SUMMARY_PROVIDER_FACORY的变量Field
（5）拿到Field的值强制转换为SummaryProviderFactory对象
（6）返回反射类中SummaryProvider对象
- private SummaryProvider getSummaryProvider(Tile tile) {
- if (!mActivity.getPackageName().equals(tile.intent.getComponent().getPackageName())) {
-
-
- return null;
- }
- Bundle metaData = getMetaData(tile);
- if (metaData == null) {
- if (DEBUG) Log.d(TAG, "No metadata specified for " + tile.intent.getComponent());
- return null;
- }
- String clsName = metaData.getString(SettingsActivity.META_DATA_KEY_FRAGMENT_CLASS);
- if (clsName == null) {
- if (DEBUG) Log.d(TAG, "No fragment specified for " + tile.intent.getComponent());
- return null;
- }
- try {
- Class<?> cls = Class.forName(clsName);
- Field field = cls.getField(SUMMARY_PROVIDER_FACTORY);
- SummaryProviderFactory factory = (SummaryProviderFactory) field.get(null);
- return factory.createSummaryProvider(mActivity, this);
- } catch (ClassNotFoundException e) {
- if (DEBUG) Log.d(TAG, "Couldn't find " + clsName, e);
- } catch (NoSuchFieldException e) {
- if (DEBUG) Log.d(TAG, "Couldn't find " + SUMMARY_PROVIDER_FACTORY, e);
- } catch (ClassCastException e) {
- if (DEBUG) Log.d(TAG, "Couldn't cast " + SUMMARY_PROVIDER_FACTORY, e);
- } catch (IllegalAccessException e) {
- if (DEBUG) Log.d(TAG, "Couldn't get " + SUMMARY_PROVIDER_FACTORY, e);
- }
- return null;
- }
以NotificationApps.java为例
- public class NotificationApps extends ManageApplications {
-
- private static class SummaryProvider implements SummaryLoader.SummaryProvider {
-
- private final Context mContext;
- private final SummaryLoader mLoader;
- private final NotificationBackend mNotificationBackend;
-
- private SummaryProvider(Context context, SummaryLoader loader) {
- mContext = context;
- mLoader = loader;
- mNotificationBackend = new NotificationBackend();
- }
-
- @Override
- public void setListening(boolean listening) {
- if (listening) {
- new AppCounter(mContext) {
- @Override
- protected void onCountComplete(int num) {
- updateSummary(num);
- }
-
- @Override
- protected boolean includeInCount(ApplicationInfo info) {
- return mNotificationBackend.getNotificationsBanned(info.packageName,
- info.uid);
- }
- }.execute();
- }
- }
-
- private void updateSummary(int count) {
- if (count == 0) {
- mLoader.setSummary(this, mContext.getString(R.string.notification_summary_none));
- } else {
- mLoader.setSummary(this, mContext.getResources().getQuantityString(
- R.plurals.notification_summary, count, count));
- }
- }
- }
-
- public static final SummaryLoader.SummaryProviderFactory SUMMARY_PROVIDER_FACTORY
- = new SummaryLoader.SummaryProviderFactory() {
- @Override
- public SummaryLoader.SummaryProvider createSummaryProvider(Activity activity,
- SummaryLoader summaryLoader) {
- return new SummaryProvider(activity, summaryLoader);
- }
- };
- }
31 setListening
（1） 移除消息Worker.MSG_SET_LISTENING
（2） 发送消息Worker.MSG_SET_LISTENING执行方法32
- public void setListening(boolean listening) {
- if (mListening == listening) return;
- mListening = listening;
-
- for (int i = 0; i < mReceivers.size(); i++) {
- mActivity.unregisterReceiver(mReceivers.valueAt(i));
- }
- mReceivers.clear();
- mWorker.removeMessages(Worker.MSG_SET_LISTENING);
- mWorker.obtainMessage(Worker.MSG_SET_LISTENING, listening ? 1 : 0, 0).sendToTarget();
- }
32 setListeningW(注意锁)
（1）遍历方法18生成的mSummaryMap键SummaryProvider
（2）将反射fragment类中静态内部类执行setListening方法
- private synchronized void setListeningW(boolean listening) {
- if (mWorkerListening == listening) return;
- mWorkerListening = listening;
- if (DEBUG) Log.d(TAG, "Listening " + listening);
- for (SummaryProvider p : mSummaryMap.keySet()) {
- try {
- p.setListening(listening);
- } catch (Exception e) {
- Log.d(TAG, "Problem in setListening", e);
- }
- }
- }
再介绍一下Settings.Java的作用
正常我们写很多activity。是不是该这样写：
- for(int i = 1 ; i <=需要新建activity的个数;i++) {
- 新建class Activityi extends SettingsActivity
- }
Google就利用java静态内部类的机制（可以去百度一下）编译就会生成他的宿主类名$静态内部类名 也就是我们manifest看见类似于Settings$WirelessSettings。这样写就避免大量白痴文件。
Google 这次7.0Settings加载逻辑大改其实对于新界面开发更容易了。只要去manifest将你的activity属性配置好。Settings.java声明。目前代码逻辑就能直接把你界面加载完毕。然后你去对应的fragment实现逻辑。这样新界面开发基本不需要改动现有逻辑。真的是厉害了，我的歌！
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