ARouter路由解析

目錄介紹

  • 01.原生跳轉實現
  • 02.實現組件跳轉方式
    • 2.1 傳統跳轉方式
    • 2.2 爲什麼須要路由
  • 03.ARouter配置與優點
  • 04.跨進程組件通訊
    • 4.1 URLScheme
    • 4.2 AIDL
    • 4.3 BroadcastReceiver
    • 4.4 路由通訊注意要點
  • 05.ARouter的結構
  • 06.ARouter的工做流程
    • 6.1 初始化流程
    • 6.2 跳轉頁面流程
  • 07.ARouter簡單調用api
    • 7.1 最簡單調用
    • 7.2 build源碼分析
    • 7.3 navigation分析
  • 08.Postcard信息攜帶
  • 09.LogisticsCenter
  • 10.DegradeService降級容錯服務
  • 11.Interceptor攔截器
  • 12.數據傳輸和自動注入
  • 13.多dex的支持
  • 14.InstantRun支持
  • 15.生成的編譯代碼

好消息

  • 博客筆記大彙總【16年3月到至今】,包括Java基礎及深刻知識點,Android技術博客,Python學習筆記等等,還包括平時開發中遇到的bug彙總,固然也在工做之餘收集了大量的面試題,長期更新維護而且修正,持續完善……開源的文件是markdown格式的!同時也開源了生活博客,從12年起,積累共計N篇[近100萬字,陸續搬到網上],轉載請註明出處,謝謝!
  • 連接地址:github.com/yangchong21…
  • 若是以爲好,能夠star一下,謝謝!固然也歡迎提出建議或者問題,萬事起於忽微,量變引發質變!

註解學習小案例

  • 註解學習小案例,比較系統性學習註解而且應用實踐。簡單應用了運行期註解,經過註解實現了setContentView功能;簡單應用了編譯器註解,經過註解實現了防暴力點擊的功能,同時支持設置時間間隔;使用註解替代枚舉;使用註解一步步搭建簡單路由案例。結合相應的博客,在來一些小案例,今後應該對註解有更加深刻的理解……
  • 開源項目地址:github.com/yangchong21…

01.原生跳轉實現

  • Google提供的原聲路由主要是經過intent,能夠分紅顯示和隱式兩種。顯示的方案會致使類之間的直接依賴問題,耦合嚴重;隱式intent須要的配置清單中統一聲明,首先有個暴露的問題,另外在多模塊開發中協做也比較困難。只要調用startActivity後面的環節咱們就沒法控制了,在出現錯誤時無能爲力。

02.實現組件跳轉方式

2.1 傳統跳轉方式

  • 第一種,經過intent跳轉
  • 第二種,經過aidl跳轉
  • 第三種,經過scheme協議跳轉

2.2 爲什麼須要路由

  • 顯示Intent:項目龐大之後,類依賴耦合太大,不適合組件化拆分
  • 隱式Intent:協做困難,調用時候不知道調什麼參數
  • 每一個註冊了Scheme的Activity均可以直接打開,有安全風險
  • AndroidMainfest集中式管理比較臃腫
  • 沒法動態修改路由,若是頁面出錯,沒法動態降級
  • 沒法動態攔截跳轉,譬如未登陸的狀況下,打開登陸頁面,登陸成功後接着打開剛纔想打開的頁面
  • H五、Android、iOS地址不同,不利於統一跳轉

03.ARouter配置與優點

3.1 ARouter的優點

  • 以下所示
    • 直接解析URL路由,解析參數並賦值
    • 支持多模塊項目
    • 支持InstantRun
    • 容許自定義攔截器
    • ARouter能夠提供IoC容器
    • 映射關係自動註冊
    • 靈活的降級策略

3.2 至於配置和使用

  • 直接看https://www.jianshu.com/p/fed5d5b95bae

04.跨進程組件通訊

4.1 URLScheme【例如:ActivityRouter、ARouter等】

  • 優點有:
    • 基因中自帶支持從webview中調用
    • 不用互相註冊(不用知道須要調用的app的進程名稱等信息)
  • 劣勢有:
    • 只能單向地給組件發送信息,適用於啓動Activity和發送指令,不適用於獲取數據(例如:獲取用戶組件的當前用戶登陸信息)
    • 須要有個額外的中轉Activity來統一處理URLScheme
    • 若是設備上安裝了多個使用相同URLScheme的app,會彈出選擇框(多個組件做爲app同時安裝到設備上時會出現這個問題)
    • 沒法進行權限設置,沒法進行開關設置,存在安全性風險

4.2 AIDL

  • 優點有:
    • 能夠傳遞Parcelable類型的對象
    • 效率高
    • 能夠設置跨app調用的開關
  • 劣勢有:
    • 調用組件以前須要提早知道該組件在那個進程,不然沒法創建ServiceConnection
    • 組件在做爲獨立app和做爲lib打包到主app時,進程名稱不一樣,維護成本高

4.3 BroadcastReceiver

  • BroadcastReceiver + Service + LocalSocket。該方案是參考cc路由框架!
  • 跨組件間通訊實現的同時,應該知足如下條件:
    • 每一個app都能給其它app調用
    • app能夠設置是否對外提供跨進程組件調用的支持
    • 組件調用的請求發出去以後,能自動探測當前設備上是否有支持這次調用的app
    • 支持超時、取消

4.4 路由通訊注意要點

05.ARouter的結構

  • ARouter主要由三部分組成,包括對外提供的api調用模塊、註解模塊以及編譯時經過註解生產相關的類模塊。
    • arouter-annotation註解的聲明和信息存儲類的模塊
    • arouter-compiler編譯期解析註解信息並生成相應類以便進行注入的模塊
    • arouter-api核心調用Api功能的模塊
  • annotation模塊
    • Route、Interceptor、Autowired都是在開發是須要的註解。
    • image
  • compiler模塊
    • AutoWiredProcessor、InterceptorProcessor、RouteProcessor分別爲annotation模塊對應的Autowired、Interceptor、Route在項目編譯時產生相關的類文件。
  • api模塊
    • 主要是ARouter具體實現和對外暴露使用的api。

06.ARouter的工做流程

6.1 初始化流程

  • 初始化代碼以下所示
    /**
     * Init, it must be call before used router.
     */
    public static void init(Application application) {
        //若是沒有初始化,則
        if (!hasInit) {
            logger = _ARouter.logger;
            _ARouter.logger.info(Consts.TAG, "ARouter init start.");
            
            //作初始化工做
            hasInit = _ARouter.init(application);
    
            if (hasInit) {
                _ARouter.afterInit();
            }
    
            _ARouter.logger.info(Consts.TAG, "ARouter init over.");
        }
    }
    複製代碼
  • 以後接着看_ARouter.init(application)這行代碼,點擊去查看
    protected static synchronized boolean init(Application application) {
        //賦值上下文
        mContext = application;
        //初始化LogisticsCenter
        LogisticsCenter.init(mContext, executor);
        logger.info(Consts.TAG, "ARouter init success!");
        hasInit = true;
        mHandler = new Handler(Looper.getMainLooper());
        return true;
    }
    複製代碼
  • 接下來看看LogisticsCenter裏面作了什麼
    public class LogisticsCenter {
        /**
         * LogisticsCenter init, load all metas in memory. Demand initialization
         */
        public synchronized static void init(Context context, ThreadPoolExecutor tpe) throws HandlerException {
            mContext = context;
            executor = tpe;
            try {
                long startInit = System.currentTimeMillis();
                Set<String> routerMap;
                //debug或者版本更新的時候每次都從新加載router信息
                // It will rebuild router map every times when debuggable.
                if (ARouter.debuggable() || PackageUtils.isNewVersion(context)) {
                    logger.info(TAG, "Run with debug mode or new install, rebuild router map.");
                    // These class was generate by arouter-compiler.
                    //加載alibaba.android.arouter.routes包下載的類
                    routerMap = ClassUtils.getFileNameByPackageName(mContext, ROUTE_ROOT_PAKCAGE);
                    if (!routerMap.isEmpty()) {
                        context.getSharedPreferences(AROUTER_SP_CACHE_KEY, Context.MODE_PRIVATE).edit().putStringSet(AROUTER_SP_KEY_MAP, routerMap).apply();
                    }
                    PackageUtils.updateVersion(context);    // Save new version name when router map update finish.
                } else {
                    logger.info(TAG, "Load router map from cache.");
                    routerMap = new HashSet<>(context.getSharedPreferences(AROUTER_SP_CACHE_KEY, Context.MODE_PRIVATE).getStringSet(AROUTER_SP_KEY_MAP, new HashSet<String>()));
                }
    
                logger.info(TAG, "Find router map finished, map size = " + routerMap.size() + ", cost " + (System.currentTimeMillis() - startInit) + " ms.");
                startInit = System.currentTimeMillis();
    
                for (String className : routerMap) {
                    if (className.startsWith(ROUTE_ROOT_PAKCAGE + DOT + SDK_NAME + SEPARATOR + SUFFIX_ROOT)) {
                        // This one of root elements, load root. 
                        //導入ARouter$$Root$$app.java,初始化Warehouse.groupsIndex集合
                        ((IRouteRoot) (Class.forName(className).getConstructor().newInstance())).loadInto(Warehouse.groupsIndex);
                    } else if (className.startsWith(ROUTE_ROOT_PAKCAGE + DOT + SDK_NAME + SEPARATOR + SUFFIX_INTERCEPTORS)) {
                        // Load interceptorMeta
                        //導入ARouter$$Interceptors$$app.java,初始化Warehouse.interceptorsIndex集合
                        ((IInterceptorGroup) (Class.forName(className).getConstructor().newInstance())).loadInto(Warehouse.interceptorsIndex);
                    } else if (className.startsWith(ROUTE_ROOT_PAKCAGE + DOT + SDK_NAME + SEPARATOR + SUFFIX_PROVIDERS)) {
                        // Load providerIndex
                        //導入ARouter$$Providers$$app.java,初始化Warehouse.providersIndex集合
                        ((IProviderGroup) (Class.forName(className).getConstructor().newInstance())).loadInto(Warehouse.providersIndex);
                    }
                }
    
                /*******部分代碼省略********/
            } catch (Exception e) {
                throw new HandlerException(TAG + "ARouter init logistics center exception! [" + e.getMessage() + "]");
            }
        }
    }
    複製代碼
  • 綜上所述,整個初始化的流程大概就是:
    • 初始化運行時的上下文環境
    • 初始化日誌logger
    • 尋找router相關的類
    • 解析而且緩存路由相關信息
    • 初始化攔截服務

6.2 跳轉頁面流程

  • image

07.ARouter調用api

7.1 最簡單調用

  • 最簡單的調用方式
    ARouter.getInstance()
                    .build("/user/UserFragment")
                    .navigation();
    複製代碼

7.2 build源碼分析

  • 這個主要是添加跳轉的路徑
    public Postcard build(String path) {
        return _ARouter.getInstance().build(path);
    }
    複製代碼
  • 而後把這個路徑添加到默認的組中
    /**
     * Build postcard by path and default group
     */
    protected Postcard build(String path) {
        if (TextUtils.isEmpty(path)) {
            throw new HandlerException(Consts.TAG + "Parameter is invalid!");
        } else {
            PathReplaceService pService = ARouter.getInstance().navigation(PathReplaceService.class);
            if (null != pService) {
                path = pService.forString(path);
            }
            return build(path, extractGroup(path));
        }
    }
    複製代碼

7.3 navigation分析

  • 以下所示
    final class _ARouter {
        protected Object navigation(final Context context, final Postcard postcard, final int requestCode, final NavigationCallback callback) {
            try {
                LogisticsCenter.completion(postcard);
            } catch (NoRouteFoundException ex) {
                /**************部分代碼省略***************/
                if (null != callback) {
                    callback.onLost(postcard);
                } else {    // No callback for this invoke, then we use the global degrade service.
                    DegradeService degradeService = ARouter.getInstance().navigation(DegradeService.class);
                    if (null != degradeService) {
                        degradeService.onLost(context, postcard);
                    }
                }
                return null;
            }
    
            if (null != callback) {
                callback.onFound(postcard);
            }
            //是否爲綠色通道,是否進過攔截器處理
            if (!postcard.isGreenChannel()) {   // It must be run in async thread, maybe interceptor cost too mush time made ANR.
                interceptorService.doInterceptions(postcard, new InterceptorCallback() {
                    @Override
                    public void onContinue(Postcard postcard) {
                        _navigation(context, postcard, requestCode, callback);
                    }
                    @Override
                    public void onInterrupt(Throwable exception) {
                        //中斷處理
                        if (null != callback) {
                            callback.onInterrupt(postcard);
                        }
                    }
                });
            } else {
                return _navigation(context, postcard, requestCode, callback);
            }
    
            return null;
        }
    
        private Object _navigation(final Context context, final Postcard postcard, final int requestCode, final NavigationCallback callback) {
            //沒有上下文環境,就用Application的上下文環境
            final Context currentContext = null == context ? mContext : context;
            switch (postcard.getType()) {
                case ACTIVITY:
                    // Build intent 構建跳轉的intent
                    final Intent intent = new Intent(currentContext, postcard.getDestination());
                    intent.putExtras(postcard.getExtras());
                    // Set flags. 設置flag
                    int flags = postcard.getFlags();
                    if (-1 != flags) {
                        intent.setFlags(flags);
                    } else if (!(currentContext instanceof Activity)) {    // Non activity, need less one flag.
                        //若是上下文不是Activity,則添加FLAG_ACTIVITY_NEW_TASK的flag
                        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                    }
                    // Navigation in main looper.  切換到主線程中
                    new Handler(Looper.getMainLooper()).post(new Runnable() {
                        @Override
                        public void run() {
                            if (requestCode > 0) {  // Need start for result
                                ActivityCompat.startActivityForResult((Activity) currentContext, intent, requestCode, postcard.getOptionsBundle());
                            } else {
                                ActivityCompat.startActivity(currentContext, intent, postcard.getOptionsBundle());
                            }
    
                            if ((0 != postcard.getEnterAnim() || 0 != postcard.getExitAnim()) && currentContext instanceof Activity) {    // Old version.
                                ((Activity) currentContext).overridePendingTransition(postcard.getEnterAnim(), postcard.getExitAnim());
                            }
    
                            if (null != callback) { // Navigation over.
                                callback.onArrival(postcard);
                            }
                        }
                    });
    
                    break;
                case PROVIDER:
                    return postcard.getProvider();
                case BOARDCAST:
                case CONTENT_PROVIDER:
                case FRAGMENT:
                    Class fragmentMeta = postcard.getDestination();
                    try {
                        Object instance = fragmentMeta.getConstructor().newInstance();
                        if (instance instanceof Fragment) {
                            ((Fragment) instance).setArguments(postcard.getExtras());
                        } else if (instance instanceof android.support.v4.app.Fragment) {
                            ((android.support.v4.app.Fragment) instance).setArguments(postcard.getExtras());
                        }
    
                        return instance;
                    } catch (Exception ex) {
                        logger.error(Consts.TAG, "Fetch fragment instance error, " + TextUtils.formatStackTrace(ex.getStackTrace()));
                    }
                case METHOD:
                case SERVICE:
                default:
                    return null;
            }
    
            return null;
        }
    }
    複製代碼

08.Postcard信息攜帶

  • Postcard主要爲信息的攜帶者,內容是在構造一次路由信息的時候生產的,其繼承於RouteMeta。RouteMeta是在代碼編譯時生成的內容,主要在初始化WareHouse時對跳轉信息作了緩存。
  • 看看代碼以下所示
    //Postcard繼承於RouteMeta
    public final class Postcard extends RouteMeta
    
    
    //而後看看編譯生成的文件
    /**
     * DO NOT EDIT THIS FILE!!! IT WAS GENERATED BY AROUTER. */
    public class ARouter$$Group$$me implements IRouteGroup {
      @Override
      public void loadInto(Map<String, RouteMeta> atlas) {
        atlas.put("/me/ExperienceCouponActivity", RouteMeta.build(RouteType.ACTIVITY, ExperienceCouponActivity.class, "/me/experiencecouponactivity", "me", null, -1, -2147483648));
        atlas.put("/me/ServiceActivity", RouteMeta.build(RouteType.ACTIVITY, ServiceActivity.class, "/me/serviceactivity", "me", null, -1, -2147483648));
        atlas.put("/me/SettingActivity", RouteMeta.build(RouteType.ACTIVITY, SettingActivity.class, "/me/settingactivity", "me", null, -1, -2147483648));
        atlas.put("/me/UdeskServiceActivity", RouteMeta.build(RouteType.ACTIVITY, UdeskServiceActivity.class, "/me/udeskserviceactivity", "me", null, -1, -2147483648));
      }
    }
    複製代碼

10.DegradeService降級容錯服務

  • 首先,自定義一個類,須要繼承DegradeService類,以下所示
    /**
     * <pre>
     *     @author 楊充
     *     blog  : https://github.com/yangchong211
     *     time  : 2018/08/24
     *     desc  : ARouter路由降級處理
     *     revise:
     * </pre>
     */
    @Route(path = DegradeServiceImpl.PATH)
    public class DegradeServiceImpl implements DegradeService {
    
        static final String PATH = "/service/DegradeServiceImpl";
    
        @Override
        public void onLost(Context context, Postcard postcard) {
            if (context != null && postcard.getGroup().equals("activity")) {
                Intent intent = new Intent(context, WebViewActivity.class);
                intent.putExtra(Constant.URL, Constant.GITHUB);
                intent.putExtra(Constant.TITLE, "github地址");
                ActivityCompat.startActivity(context, intent, null);
            }
        }
    
        @Override
        public void init(Context context) {
    
        }
    }
    複製代碼
  • 如何使用該降級方案,十分簡單。
    NavigationCallback callback = new NavCallback() {
        @Override
        public void onArrival(Postcard postcard) {
            LogUtils.i("ARouterUtils"+"---跳轉完了");
        }
    
        @Override
        public void onFound(Postcard postcard) {
            super.onFound(postcard);
            LogUtils.i("ARouterUtils"+"---找到了");
        }
    
        @Override
        public void onInterrupt(Postcard postcard) {
            super.onInterrupt(postcard);
            LogUtils.i("ARouterUtils"+"---被攔截了");
        }
    
        @Override
        public void onLost(Postcard postcard) {
            super.onLost(postcard);
            LogUtils.i("ARouterUtils"+"---找不到了");
            DegradeServiceImpl degradeService = new DegradeServiceImpl();
            degradeService.onLost(Utils.getApp(),postcard);
        }
    };
    複製代碼

11.Interceptor攔截器

  • 在ARouter模塊的時候講述Interceptor的使用,若是本次路由跳轉不是走的綠色通道那麼則會觸發攔截器進行過濾。
    final class _ARouter {
        protected Object navigation(final Context context, final Postcard postcard, final int requestCode, final NavigationCallback callback) {
            /************部分代碼省略************/
    
            if (!postcard.isGreenChannel()) {   // It must be run in async thread, maybe interceptor cost too mush time made ANR.
                interceptorService.doInterceptions(postcard, new InterceptorCallback() {
                    /**
                     * Continue process
                     *
                     * @param postcard route meta
                     */
                    @Override
                    public void onContinue(Postcard postcard) {
                        _navigation(context, postcard, requestCode, callback);
                    }
    
                    /**
                     * Interrupt process, pipeline will be destory when this method called.
                     *
                     * @param exception Reson of interrupt.
                     */
                    @Override
                    public void onInterrupt(Throwable exception) {
                        if (null != callback) {
                            callback.onInterrupt(postcard);
                        }
    
                        logger.info(Consts.TAG, "Navigation failed, termination by interceptor : " + exception.getMessage());
                    }
                });
            } else {
                return _navigation(context, postcard, requestCode, callback);
            }
            return null;
        }
    }
    複製代碼
  • 攔截器的初始化
    • 在剛開始初始化的時候,就已經作了這個操做。
    final class _ARouter {
        static void afterInit() {
            // Trigger interceptor init, use byName.
            interceptorService = (InterceptorService) ARouter.getInstance().build("/arouter/service/interceptor").navigation();
        }
    }
    複製代碼
  • InterceptorServiceImpl的init方法:
    @Route(path = "/arouter/service/interceptor")
    public class InterceptorServiceImpl implements InterceptorService {
        @Override
        public void init(final Context context) {
            LogisticsCenter.executor.execute(new Runnable() {
                @Override
                public void run() {
                    if (MapUtils.isNotEmpty(Warehouse.interceptorsIndex)) {
                        //循環遍歷倉庫中的攔截器
                        for (Map.Entry<Integer, Class<? extends IInterceptor>> entry : Warehouse.interceptorsIndex.entrySet()) {
                            Class<? extends IInterceptor> interceptorClass = entry.getValue();
                            try {
                                //反射機制構造自定義的每個攔截器實例
                                IInterceptor iInterceptor = interceptorClass.getConstructor().newInstance();
                                iInterceptor.init(context);
                                //並將其添加在緩存中
                                Warehouse.interceptors.add(iInterceptor);
                            } catch (Exception ex) {
                                throw new HandlerException(TAG + "ARouter init interceptor error! name = [" + interceptorClass.getName() + "], reason = [" + ex.getMessage() + "]");
                            }
                        }
                        interceptorHasInit = true;
                        logger.info(TAG, "ARouter interceptors init over.");
                        synchronized (interceptorInitLock) {
                            interceptorInitLock.notifyAll();
                        }
                    }
                }
            });
        }
    }
    複製代碼
  • 攔截器的工做過程
    @Route(path = "/arouter/service/interceptor")
    public class InterceptorServiceImpl implements InterceptorService {
        @Override
        public void doInterceptions(final Postcard postcard, final InterceptorCallback callback) {
            if (null != Warehouse.interceptors && Warehouse.interceptors.size() > 0) {
                //檢測是否初始化完全部的爛機器
                checkInterceptorsInitStatus();
                //沒有完成正常的初始化,拋異常
                if (!interceptorHasInit) {
                    callback.onInterrupt(new HandlerException("Interceptors initialization takes too much time."));
                    return;
                }
                //順序遍歷每個攔截器,
                LogisticsCenter.executor.execute(new Runnable() {
                    @Override
                    public void run() {
                        CancelableCountDownLatch interceptorCounter = new CancelableCountDownLatch(Warehouse.interceptors.size());
                        try {
                            _excute(0, interceptorCounter, postcard);
                            interceptorCounter.await(postcard.getTimeout(), TimeUnit.SECONDS);
                            //攔截器的遍歷終止以後,若是有還有沒有遍歷的攔截器,則表示路由事件被攔截
                            if (interceptorCounter.getCount() > 0) {    // Cancel the navigation this time, if it hasn't return anythings. callback.onInterrupt(new HandlerException("The interceptor processing timed out.")); } else if (null != postcard.getTag()) { // Maybe some exception in the tag. callback.onInterrupt(new HandlerException(postcard.getTag().toString())); } else { callback.onContinue(postcard); } } catch (Exception e) { callback.onInterrupt(e); } } }); } else { callback.onContinue(postcard); } } //執行攔截器的過濾事件 private static void _excute(final int index, final CancelableCountDownLatch counter, final Postcard postcard) { if (index < Warehouse.interceptors.size()) { IInterceptor iInterceptor = Warehouse.interceptors.get(index); iInterceptor.process(postcard, new InterceptorCallback() { @Override public void onContinue(Postcard postcard) { // Last interceptor excute over with no exception. counter.countDown(); //若是當前沒有攔截過濾,那麼使用下一個攔截器 _excute(index + 1, counter, postcard); // When counter is down, it will be execute continue ,but index bigger than interceptors size, then U know. } @Override public void onInterrupt(Throwable exception) { // Last interceptor excute over with fatal exception. postcard.setTag(null == exception ? new HandlerException("No message.") : exception.getMessage()); // save the exception message for backup. counter.cancel(); } }); } } } 複製代碼

12.數據傳輸和自動注入

13.多dex的支持

  • 可查看multidex源碼:
    public class ClassUtils {  
      /**
         * Identifies if the current VM has a native support for multidex, meaning there is no need for
         * additional installation by this library.
         *
         * @return true if the VM handles multidex
         */
        private static boolean isVMMultidexCapable() {
            boolean isMultidexCapable = false;
            String vmName = null;
    
            try {
                if (isYunOS()) {    // YunOS須要特殊判斷
                    vmName = "'YunOS'";
                    isMultidexCapable = Integer.valueOf(System.getProperty("ro.build.version.sdk")) >= 21;
                } else {    // 非YunOS原生Android
                    vmName = "'Android'";
                    String versionString = System.getProperty("java.vm.version");
                    if (versionString != null) {
                        Matcher matcher = Pattern.compile("(\\d+)\\.(\\d+)(\\.\\d+)?").matcher(versionString);
                        if (matcher.matches()) {
                            try {
                                int major = Integer.parseInt(matcher.group(1));
                                int minor = Integer.parseInt(matcher.group(2));
                                isMultidexCapable = (major > VM_WITH_MULTIDEX_VERSION_MAJOR)
                                        || ((major == VM_WITH_MULTIDEX_VERSION_MAJOR)
                                        && (minor >= VM_WITH_MULTIDEX_VERSION_MINOR));
                            } catch (NumberFormatException ignore) {
                                // let isMultidexCapable be false
                            }
                        }
                    }
                }
            } catch (Exception ignore) {
    
            }
    
            Log.i(Consts.TAG, "VM with name " + vmName + (isMultidexCapable ? " has multidex support" : " does not have multidex support"));
            return isMultidexCapable;
        }
    }
    複製代碼

14.InstantRun支持

  • 什麼是InstantRun支持?
    • Android Studio 2.0 中引入的 Instant Run 是 Run 和 Debug 命令的行爲,能夠大幅縮短應用更新的時間。儘管首次構建可能須要花費較長的時間,Instant Run 在嚮應用推送後續更新時則無需構建新的 APK,所以,這樣能夠更快地看到更改。

15.生成的編譯代碼

  • 以下所示
    • image

關於其餘內容介紹

01.關於博客彙總連接

02.關於個人博客

註解開源項目地址:github.com/yangchong21…

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