使用前配置
- 在每个module的build.gradle添加如下代码，作用是为注解执行器提供module的名称
defaultConfig {
...
javaCompileOptions {
annotationProcessorOptions {
arguments = [AROUTER_MODULE_NAME: project.getName()]
}
}
}
- 添加依赖
dependencies {
api ''com.alibaba:arouter-api:1.4.1'
annotationProcessor 'com.alibaba:arouter-compiler:1.2.2'
...
}
- 在Application初始化
if (isDebug()) {
ARouter.openLog();
ARouter.openDebug();
}
ARouter.init(mApplication);
- 在需要使用的类声明注解
@Route(path = "/test/activity")
public class YourActivity extend Activity {
...
}
- 调用api
// 1. Simple jump within application (Jump via URL in 'Advanced usage')
ARouter.getInstance().build("/test/activity").navigation();
// 2. Jump with parameters
ARouter.getInstance().build("/test/1")
.withLong("key1", 666L)
.withString("key3", "888")
.withObject("key4", new Test("Jack", "Rose"))
.navigation();
// 3. with Bundle
Bundle bundle= new Bundle();
ARouter.getInstance()
.build("/test/1")
.with(bundle)
.navigation();
// 4. with Parcelable
public class LoginAction implements Parcelable {
}
@Route(path = ROUTE_LOGIN)
public class LoginActivity {
@Autowired(name = Constants.INTENT_KEY_LOGIN_ACTION)
public LoginAction loginAction;
}
ARouter.getInstance()
.build(ROUTE_LOGIN)
.withParcelable(Constants.INTENT_KEY_LOGIN_ACTION, loginAction)
.navigation();
注意：在工程的主module里需要依赖其他所有module，否则会找不到路由
额外一些使用
- 自定义Provider服务
// 1. 继承IProvider接口
public interface MyService extends IProvider {
String doSomething();
}
// 2. 实现MyService接口，加上注解
@Route(path = "/myservice/xxx")
public class MyServiceImpl implements MyService {
@Override
public void init(Context context) {
}
@Override
public String doSomething() {
return "haha";
}
}
- 获取Provider服务的方法
// 1. 通过路径获取
ARouter.getInstance().build("/myservice/xxx").navigation()
// 2. 通过类名获取
ARouter.getInstance().navigation(MyService.class)
- 跳转动画(api >= 16)
ActivityOptionsCompat compat = ActivityOptionsCompat.makeCustomAnimation(this,
R.anim.translate_in, R.anim.translate_none);
ARouter.getInstance()
.build("/test/activity")
.withOptionsCompat(compat)
.navigation();
- 跳转携带参数不常用的一种，原理是将实体类转换成json字符串，通过String的方式进行传递
// 首先需要实现SerializationService
@Route(path = "/serializationservice/s1")
public class SerializationServiceIpml implements SerializationService {
@Deprecated
@Override
public T json2Object(String input, Class clazz) {
return null;
}
@Override
public String object2Json(Object instance) {
return null;
}
@Override
public T parseObject(String input, Type clazz) {
return null;
}
@Override
public void init(Context context) {
}
}
ARouter.getInstance()
.build("/test/1")
.withObject("key_bean", bean)
.navigation();
- 全局的降级策略
@Route(path = "/degradeservice/d1")
public class DegradeServiceImpl implements DegradeService {
private static final String TAG = "DegradeServiceImpl";
@Override
public void onLost(Context context, Postcard postcard) {
// do something.
Log.d(TAG, "DegradeService##onLost");
}
@Override
public void init(Context context) {
Log.d(TAG, "DegradeService##init");
}
}
- 实现路径转换
@Route(path = "/pathservice/p1")
public class PathReplaceServiceImpl implements PathReplaceService {
private static final String TAG = "PathReplaceServiceImpl";
@Override
public void init(Context context) {
Log.d(TAG, "PathReplaceService##init");
}
@Override
public String forString(String path) {
Log.d(TAG, "PathReplaceService##forString");
return path;
}
@Override
public Uri forUri(Uri uri) {
Log.d(TAG, "PathReplaceService##forUri");
return uri;
}
}
- 使用带回调的跳转
ARouter.getInstance().build("/test/test1").navigation(this, new NavCallback() {
@Override
public void onFound(Postcard postcard) {
//
}
@Override
public void onLost(Postcard postcard) {
// 找不到路径对应的目标
}
@Override
public void onArrival(Postcard postcard) {
// 跳转完成
}
@Override
public void onInterrupt(Postcard postcard) {
// 被拦截了，Important! 该方法运行在子线程
}
});
- 使用拦截器，priority值越小，优先级越高，值不能定义一样的
@Interceptor(priority = 5)
public class Test1Interceptor implements IInterceptor {
@Override
public void process(Postcard postcard, InterceptorCallback callback) {
// process方法运行在子线程
//在此方法中如果没有调用以下两个方法其中之一，那么不再执行后续的拦截器
//需等待300s（默认值，可设置改变）的时间，才能抛出拦截器中断
callback.onContinue(postcard);
callback.onInterrupt(exception)
}
@Override
public void init(Context context) {
// 拦截器的初始化发生在跳转之前
}
}
源码分析
ARouter提供了两个SDK，分别是面向两个不同的阶段。API这个SDK是面向运行期的，而Compiler这个SDK则是作用于编译期的。
一、 注解执行器生成java代码
此阶段发生在编译期，主要是通过自定义的注解执行器对代码中的@Route、@Autowired和@Interceptor这三个注解进行解析，生成java文件。具体的细节请看这篇文章 阿里ARouter使用及源码解析，注解执行器的使用看这篇文章 Android编译时注解APT实战。
编译生成的文件路径和文件内容如下：
文件路径和文件名
public class ARouter$$Group$$mylibrary implements IRouteGroup {
@Override
public void loadInto(Map atlas) {
atlas.put("/mylibrary/MyLibActivity", RouteMeta.build(RouteType.ACTIVITY, MyLibActivity.class,
"/mylibrary/mylibactivity", "mylibrary", new java.util.HashMap(){{
put("name", 8); }}, -1, -2147483648));
}
}
public class ARouter$$Providers$$mylibrary implements IProviderGroup {
@Override
public void loadInto(Map providers) {
}
}
public class ARouter$$Root$$mylibrary implements IRouteRoot {
@Override
public void loadInto(Map> routes) {
routes.put("mylibrary", ARouter$$Group$$mylibrary.class);
}
}
public class MyLibActivity$$ARouter$$Autowired implements ISyringe {
private SerializationService serializationService;
@Override
public void inject(Object target) {
serializationService = ARouter.getInstance().navigation(SerializationService.class);
MyLibActivity substitute = (MyLibActivity)target;
substitute.name = substitute.getIntent().getStringExtra("name");
}
}
public class ARouter$$Interceptors$$common implements IInterceptorGroup {
@Override
public void loadInto(Map> interceptors) {
interceptors.put(5, Test1Interceptor.class);
}
}
二、 应用启动时初始化
// Application的onCreate方法中调用
ARouter.init(this);
public static void init(Application application) {
if (!hasInit) {
// 步骤1
hasInit = _ARouter.init(application);
if (hasInit) {
// 步骤2
_ARouter.afterInit();
}
}
}
1. 步骤1主要是将自动生成的类加载进内存仓库
ARouter 仅载入了 Group 清单，并没有具体载入每个 Group 中包含的具体的路由节点清单，只有当使用到具体的 Group 时，才会加载对应的 Group 列表
首先判断是否使用了插件来获取“com.alibaba.android.arouter.routes”这个包底下的类名信息，如果没有的话需要扫描dex文件来获取这些信息。
// _ARouter的init方法
// 创建了一个核心数和最大数都为cpu+1的线程池，队列为64
protected static synchronized boolean init(Application application) {
mContext = application;
// 主要方法
LogisticsCenter.init(mContext, executor);
hasInit = true;
mHandler = new Handler(Looper.getMainLooper());
return true;
}
// LogisticsCenter的init方法
public synchronized static void init(Context context, ThreadPoolExecutor tpe) throws HandlerException {
mContext = context;
executor = tpe;
try {
// 判断是否用插件扫描加载类信息
if (registerByPlugin) {
logger.info(TAG, "Load router map by arouter-auto-register plugin.");
} else {
Set routerMap;
// 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.");
// 扫描dex
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 finishes.
} else {
// 从缓存取
routerMap = new HashSet<>(context.getSharedPreferences(AROUTER_SP_CACHE_KEY, Context.MODE_PRIVATE).getStringSet(AROUTER_SP_KEY_MAP, new HashSet()));
}
logger.info(TAG, "Find router map finished, map size = " + routerMap.size() + ", cost " + (System.currentTimeMillis() - startInit) + " ms.");
startInit = System.currentTimeMillis();
// 反射生成对应的类，保存到内存仓库
for (String className : routerMap) {
if (className.startsWith(ROUTE_ROOT_PAKCAGE + DOT + SDK_NAME + SEPARATOR + SUFFIX_ROOT)) {
// This one of root elements, load root.
((IRouteRoot) (Class.forName(className).getConstructor().newInstance())).loadInto(Warehouse.groupsIndex);
} else if (className.startsWith(ROUTE_ROOT_PAKCAGE + DOT + SDK_NAME + SEPARATOR + SUFFIX_INTERCEPTORS)) {
// Load interceptorMeta
((IInterceptorGroup) (Class.forName(className).getConstructor().newInstance())).loadInto(Warehouse.interceptorsIndex);
} else if (className.startsWith(ROUTE_ROOT_PAKCAGE + DOT + SDK_NAME + SEPARATOR + SUFFIX_PROVIDERS)) {
// Load providerIndex
((IProviderGroup) (Class.forName(className).getConstructor().newInstance())).loadInto(Warehouse.providersIndex);
}
}
}
} catch (Exception e) {
throw new HandlerException(TAG + "ARouter init logistics center exception! [" + e.getMessage() + "]");
}
}
2. 步骤2主要是初始化拦截器
// _ARouter的afterInit方法
static void afterInit() {
interceptorService = (InterceptorService) ARouter.getInstance().build("/arouter/service/interceptor").navigation();
}
此处初始化拦截器的方法和第三步要分析的调用过程是同一个，所以放一起分析。
三、调用过程分析
调用方法如下：
ARouter.getInstance().build("/arouter/service/interceptor").navigation();
1. ARouter.getInstance().build("/arouter/service/interceptor")最终会调用到_ARouter中的build方法
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));
}
}
protected Postcard build(String path, String group) {
if (TextUtils.isEmpty(path) || TextUtils.isEmpty(group)) {
throw new HandlerException(Consts.TAG + "Parameter is invalid!");
} else {
PathReplaceService pService = ARouter.getInstance().navigation(PathReplaceService.class);
if (null != pService) {
path = pService.forString(path);
}
return new Postcard(path, group);
}
}
public final class Postcard extends RouteMeta {
// Base
private Uri uri;
private Object tag; // A tag prepare for some thing wrong.
private Bundle mBundle; // Data to transform
private int flags = -1; // Flags of route
private int timeout = 300; // Navigation timeout, TimeUnit.Second
private IProvider provider; // It will be set value, if this postcard was provider.
private boolean greenChannel;
private SerializationService serializationService;
// Animation
private Bundle optionsCompat; // The transition animation of activity
private int enterAnim = -1;
private int exitAnim = -1;
}
这里主要做的事情就是生成一个Postcard对象，根据路径截取group名称，保存在里面。Postcard是RouteMeta的子类，保存了跳转时相关的信息。此处可以看到，如果我们实现了PathReplaceService，会调用forString方法进行转换path
2. 拿到Postcard对象之后调用navigation，最终调用的是_ARouter的navigation方法，如下
protected Object navigation(final Context context, final Postcard postcard, final int requestCode, final NavigationCallback callback) {
try {
// 方法1
LogisticsCenter.completion(postcard);
} catch (NoRouteFoundException ex) {
// 如果抛异常了，有设置回调的话，调用回调的onLost
if (null != callback) {
callback.onLost(postcard);
} else {
// 如果没有设置回调，则调用全局的降级策略，需要自己实现
DegradeService degradeService = ARouter.getInstance().navigation(DegradeService.class);
if (null != degradeService) {
degradeService.onLost(context, postcard);
}
}
return null;
}
// 没有抛异常，有设置回调的话，调用回调的onFound
if (null != callback) {
callback.onFound(postcard);
}
// 判断是否需要经过拦截器
if (!postcard.isGreenChannel()) {
// 关键方法3
interceptorService.doInterceptions(postcard, new InterceptorCallback() {
@Override
public void onContinue(Postcard postcard) {
// 关键方法2
_navigation(context, postcard, requestCode, callback);
}
@Override
public void onInterrupt(Throwable exception) {
if (null != callback) {
// 被拦截器拦截了，有设置回调的话，调用回调的onInterrupt
callback.onInterrupt(postcard);
}
}
});
} else {
// 关键方法2，不管经不经过拦截器，最终都调用此方法
return _navigation(context, postcard, requestCode, callback);
}
return null;
}
1. 首先我们看关键方法1
public synchronized static void completion(Postcard postcard) {
if (null == postcard) {
throw new NoRouteFoundException(TAG + "No postcard!");
}
RouteMeta routeMeta = Warehouse.routes.get(postcard.getPath());
if (null == routeMeta) { // Maybe its does't exist, or didn't load.
Class groupMeta = Warehouse.groupsIndex.get(postcard.getGroup()); // Load route meta.
if (null == groupMeta) {
throw new NoRouteFoundException(TAG + "There is no route match the path [" + postcard.getPath() + "], in group [" + postcard.getGroup() + "]");
} else {
// Load route and cache it into memory, then delete from metas.
try {
if (ARouter.debuggable()) {
logger.debug(TAG, String.format(Locale.getDefault(), "The group [%s] starts loading, trigger by [%s]", postcard.getGroup(), postcard.getPath()));
}
IRouteGroup iGroupInstance = groupMeta.getConstructor().newInstance();
iGroupInstance.loadInto(Warehouse.routes);
Warehouse.groupsIndex.remove(postcard.getGroup());
if (ARouter.debuggable()) {
logger.debug(TAG, String.format(Locale.getDefault(), "The group [%s] has already been loaded, trigger by [%s]", postcard.getGroup(), postcard.getPath()));
}
} catch (Exception e) {
throw new HandlerException(TAG + "Fatal exception when loading group meta. [" + e.getMessage() + "]");
}
completion(postcard); // Reload
}
} else {
postcard.setDestination(routeMeta.getDestination());
postcard.setType(routeMeta.getType());
postcard.setPriority(routeMeta.getPriority());
postcard.setExtra(routeMeta.getExtra());
Uri rawUri = postcard.getUri();
if (null != rawUri) { // Try to set params into bundle.
Map resultMap = TextUtils.splitQueryParameters(rawUri);
Map paramsType = routeMeta.getParamsType();
if (MapUtils.isNotEmpty(paramsType)) {
// Set value by its type, just for params which annotation by @Param
for (Map.Entry params : paramsType.entrySet()) {
setValue(postcard,
params.getValue(),
params.getKey(),
resultMap.get(params.getKey()));
}
// Save params name which need auto inject.
postcard.getExtras().putStringArray(ARouter.AUTO_INJECT, paramsType.keySet().toArray(new String[]{}));
}
// Save raw uri
postcard.withString(ARouter.RAW_URI, rawUri.toString());
}
switch (routeMeta.getType()) {
case PROVIDER: // if the route is provider, should find its instance
// Its provider, so it must implement IProvider
Class providerMeta = (Class) routeMeta.getDestination();
IProvider instance = Warehouse.providers.get(providerMeta);
if (null == instance) { // There's no instance of this provider
IProvider provider;
try {
provider = providerMeta.getConstructor().newInstance();
provider.init(mContext);
Warehouse.providers.put(providerMeta, provider);
instance = provider;
} catch (Exception e) {
throw new HandlerException("Init provider failed! " + e.getMessage());
}
}
postcard.setProvider(instance);
postcard.greenChannel(); // Provider should skip all of interceptors
break;
case FRAGMENT:
postcard.greenChannel(); // Fragment needn't interceptors
default:
break;
}
}
}
此方法首先判断内存仓库Warehouse里面是否已经有该路径对应的RouteMeta，如果没有则调用自动生成的IRouteGroup的loadInto方法加载进来，然后通过RouteMeta对postcard对象赋值。此外可以看到，IProvider和Fragment是不需要经过拦截器的。
2. 接着我们看关键方法2
private Object _navigation(final Context context, final Postcard postcard, final int requestCode, final NavigationCallback callback) {
final Context currentContext = null == context ? mContext : context;
switch (postcard.getType()) {
case ACTIVITY:
// Build intent
final Intent intent = new Intent(currentContext, postcard.getDestination());
intent.putExtras(postcard.getExtras());
// Set flags.
int flags = postcard.getFlags();
if (-1 != flags) {
intent.setFlags(flags);
} else if (!(currentContext instanceof Activity)) { // Non activity, need less one flag.
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
}
// Set Actions
String action = postcard.getAction();
if (!TextUtils.isEmpty(action)) {
intent.setAction(action);
}
// Navigation in main looper.
runInMainThread(new Runnable() {
@Override
public void run() {
startActivity(requestCode, currentContext, intent, postcard, callback);
}
});
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;
}
// startActivity方法
private void startActivity(int requestCode, Context currentContext, Intent intent, Postcard postcard, NavigationCallback callback) {
if (requestCode >= 0) { // Need start for result
if (currentContext instanceof Activity) {
ActivityCompat.startActivityForResult((Activity) currentContext, intent, requestCode, postcard.getOptionsBundle());
} else {
logger.warning(Consts.TAG, "Must use [navigation(activity, ...)] to support [startActivityForResult]");
}
} else {
ActivityCompat.startActivity(currentContext, intent, postcard.getOptionsBundle());
}
if ((-1 != postcard.getEnterAnim() && -1 != postcard.getExitAnim()) && currentContext instanceof Activity) { // Old version.
((Activity) currentContext).overridePendingTransition(postcard.getEnterAnim(), postcard.getExitAnim());
}
// 跳转之后，如果有设置回调，调用onArrival
if (null != callback) {
callback.onArrival(postcard);
}
}
此方法比较简单，就是根据不同的类型做不同的事情，Activity的话就执行startActivity跳转，如果是Fragment的话就返回Fragment对象，如果是IProvider的话就返回IProvider对象。
3. 最后我们看关键方法3
if (!postcard.isGreenChannel()) {
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());
}
});
}
interceptorService是InterceptorServiceImpl对象，是在ARouter初始化时，调用_ARouter的afterInit方法创建的，即ARouter.getInstance().build("/arouter/service/interceptor").navigation();
这个方法的流程在上面关键方法1我们已经分析过了，它主要是初始化了InterceptorServiceImpl对象，并调用了init方法
case PROVIDER:
Class providerMeta = (Class) routeMeta.getDestination();
IProvider instance = Warehouse.providers.get(providerMeta);
if (null == instance) { // There's no instance of this provider
IProvider provider;
try {
provider = providerMeta.getConstructor().newInstance();
provider.init(mContext);
Warehouse.providers.put(providerMeta, provider);
instance = provider;
} catch (Exception e) {
throw new HandlerException("Init provider failed! " + e.getMessage());
}
}
postcard.setProvider(instance);
postcard.greenChannel(); // Provider should skip all of interceptors
break;
下面看看InterceptorServiceImpl对象init方法
@Override
public void init(final Context context) {
LogisticsCenter.executor.execute(new Runnable() {
@Override
public void run() {
if (MapUtils.isNotEmpty(Warehouse.interceptorsIndex)) {
for (Map.Entry> entry : Warehouse.interceptorsIndex.entrySet()) {
Class interceptorClass = entry.getValue();
try {
IInterceptor iInterceptor = interceptorClass.getConstructor().newInstance();
iInterceptor.init(context);
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();
}
}
}
});
}
此方法主要是按照优先级顺序生成所有拦截器对象，并调用拦截器的init方法，是在线程池中操作的，所有init执行完之后会将标志位置为true，interceptorHasInit = true;
接着看看interceptorService的doInterceptions方法
@Override
public void doInterceptions(final Postcard postcard, final InterceptorCallback callback) {
if (null != Warehouse.interceptors && Warehouse.interceptors.size() > 0) {
// 第一步先检查是否所有拦截器都执行完init方法
checkInterceptorsInitStatus();
if (!interceptorHasInit) {
callback.onInterrupt(new HandlerException("Interceptors initialization takes too much time."));
return;
}
// 第二步在线程池中执行拦截器的process方法
LogisticsCenter.executor.execute(new Runnable() {
@Override
public void run() {
CancelableCountDownLatch interceptorCounter = new CancelableCountDownLatch(Warehouse.interceptors.size());
try {
// 关键方法
_excute(0, interceptorCounter, postcard);
// 设置等待的时间
interceptorCounter.await(postcard.getTimeout(), TimeUnit.SECONDS);
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()) {
// 在拦截器中我们可以给postcard设置tag，如果tag不为null，最终会走我们设置的callback的onInterrupt，tag一般用来设置异常
callback.onInterrupt(new HandlerException(postcard.getTag().toString()));
} else {
callback.onContinue(postcard);
}
} catch (Exception e) {
callback.onInterrupt(e);
}
}
});
} else {
// 没有拦截器
callback.onContinue(postcard);
}
}
private static void checkInterceptorsInitStatus() {
synchronized (interceptorInitLock) {
while (!interceptorHasInit) {
try {
interceptorInitLock.wait(10 * 1000);
} catch (InterruptedException e) {
throw new HandlerException(TAG + "Interceptor init cost too much time error! reason = [" + e.getMessage() + "]");
}
}
}
}
我们看看关键方法_excute
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();
_excute(index + 1, counter, postcard);
}
@Override
public void onInterrupt(Throwable exception) {
postcard.setTag(null == exception ? new HandlerException("No message.") : exception.getMessage());
counter.cancel();
}
});
}
}
可以看到，这个方法主要是逐一取出拦截器，并执行process方法，在此方法中我们需要调用 callback.onContinue(postcard);或者callback.onInterrupt(exception);
四、 分析传值的过程
传值的方法在上面api使用已经介绍过，在相应的界面，我们可以通过注解和调用inject方法来获取相应的值
@Autowired
public String name;
ARouter.getInstance().inject(this);
传值的过程比较简单，注解执行器在编译阶段会将@Autowired注解生成对应的文件。
public class MyLibActivity$$ARouter$$Autowired implements ISyringe {
private SerializationService serializationService;
@Override
public void inject(Object target) {
serializationService = ARouter.getInstance().navigation(SerializationService.class);
MyLibActivity substitute = (MyLibActivity)target;
substitute.name = substitute.getIntent().getStringExtra("name");
}
}
当你调用ARouter.getInstance().inject(this)时，根据类名取出相应的ISyringe对象，该对象就是上面所说自动生成的类的对象
static void inject(Object thiz) {
AutowiredService autowiredService = ((AutowiredService) ARouter.getInstance().build("/arouter/service/autowired").navigation());
if (null != autowiredService) {
autowiredService.autowire(thiz);
}
}
@Override
public void autowire(Object instance) {
String className = instance.getClass().getName();
try {
if (!blackList.contains(className)) {
ISyringe autowiredHelper = classCache.get(className);
if (null == autowiredHelper) { // No cache.
autowiredHelper = (ISyringe) Class.forName(instance.getClass().getName() + SUFFIX_AUTOWIRED).getConstructor().newInstance();
}
autowiredHelper.inject(instance);
classCache.put(className, autowiredHelper);
}
} catch (Exception ex) {
blackList.add(className); // This instance need not autowired.
}
}
最终调用了自动生成的类里面的inject方法，其实就是通过getIntent来对成员变量赋值
@Override
public void inject(Object target) {
serializationService = ARouter.getInstance().navigation(SerializationService.class);
MyLibActivity substitute = (MyLibActivity)target;
substitute.name = substitute.getIntent().getStringExtra("name");
}
至此，整个流程分析完了。
额外补充
- Android Studio插件ARouterHelper可以方便的点击跳转到对应的类
- 通过gradle插件router表信息
apply plugin: 'com.alibaba.arouter'
dependencies {
classpath "com.alibaba:arouter-register:1.0.2"
}