路由作为项目组件化的基础，其重要程度不言而喻，这里我们就来一起学习阿里开源的路由框架 ARouter（一个用于帮助 Android App 进行组件化改造的框架 —— 支持模块间的路由、通信、解耦）;
对应github地址：https://github.com/alibaba/ARouter
ARouter源码结构我们将代码下载到本地，目录结构如下：
主要模块功能：
- arouter-annotation ：相关注解模块；涉及的注解有Route【路由跳转】、Interceptor【路由拦截器】、Autowired【参数传递】；
- arouter-api：ARouter 框架的 API，方法调用的核心；
- arouter-compiler ：编译器对注解的处理库；
以demo为例，当运行项目后会在build文件下生成arouter相关代码；
我们接下来也就主要围绕这三个模块进行源码分析；
arouter-compiler有三个Processor，均继承自BaseProcessor；
1.RouteProcesser – 处理@Autowired, @Route；
2.InterceptorProcessor – 处理@Interceptor；
3.AutowiredProcessor – 处理@Autowired；
public abstract class BaseProcessor extends AbstractProcessor {
Filer mFiler;
Logger logger;
Types types;
Elements elementUtils;
TypeUtils typeUtils;
// Module name, maybe its 'app' or others
String moduleName = null;
// If need generate router doc
boolean generateDoc;
@Override
public synchronized void init(ProcessingEnvironment processingEnv) {
super.init(processingEnv);
//一些文件操作数据类型描述工具初始化工作
mFiler = processingEnv.getFiler();
types = processingEnv.getTypeUtils();
elementUtils = processingEnv.getElementUtils();
typeUtils = new TypeUtils(types, elementUtils);
logger = new Logger(processingEnv.getMessager());
// module name，使用arouter-compiler的module都要配置build.gradle,否则抛出exception
Map options = processingEnv.getOptions();
if (MapUtils.isNotEmpty(options)) {
moduleName = options.get(KEY_MODULE_NAME);
generateDoc = VALUE_ENABLE.equals(options.get(KEY_GENERATE_DOC_NAME));
}
if (StringUtils.isNotEmpty(moduleName)) {
moduleName = moduleName.replaceAll("[^0-9a-zA-Z_]+", "");
...
} else {
logger.error(NO_MODULE_NAME_TIPS);
...
}
}
...
}
RouteProcesser源码分析
RouteProcesser.process
if (CollectionUtils.isNotEmpty(annotations)) {
Set routeElements = roundEnv.getElementsAnnotatedWith(Route.class);
try {
logger.info(">>> Found routes, start... <<<");
this.parseRoutes(routeElements);
} catch (Exception e) {
logger.error(e);
}
return true;
}
return false;
我们再重点关注parseRoutes(routeElements)这个方法,比较长；
private void parseRoutes(Set routeElements) throws IOException {
if (CollectionUtils.isNotEmpty(routeElements)) {
// prepare the type an so on.
logger.info(">>> Found routes, size is " + routeElements.size() + " <<<");
rootMap.clear();
TypeMirror type_Activity = elementUtils.getTypeElement(ACTIVITY).asType();
TypeMirror type_Service = elementUtils.getTypeElement(SERVICE).asType();
TypeMirror fragmentTm = elementUtils.getTypeElement(FRAGMENT).asType();
TypeMirror fragmentTmV4 = elementUtils.getTypeElement(Consts.FRAGMENT_V4).asType();
// Interface of ARouter
TypeElement type_IRouteGroup = elementUtils.getTypeElement(IROUTE_GROUP);
TypeElement type_IProviderGroup = elementUtils.getTypeElement(IPROVIDER_GROUP);
ClassName routeMetaCn = ClassName.get(RouteMeta.class);
ClassName routeTypeCn = ClassName.get(RouteType.class);
// 创建参数类型 Map>
ParameterizedTypeName inputMapTypeOfRoot = ParameterizedTypeName.get(
ClassName.get(Map.class),
ClassName.get(String.class),
ParameterizedTypeName.get(
ClassName.get(Class.class),
WildcardTypeName.subtypeOf(ClassName.get(type_IRouteGroup))
)
);
// 创建参数类型 Map
ParameterizedTypeName inputMapTypeOfGroup = ParameterizedTypeName.get(
ClassName.get(Map.class),
ClassName.get(String.class),
ClassName.get(RouteMeta.class)
);
// 创建方法参数 routes, atlas, providers
ParameterSpec rootParamSpec = ParameterSpec.builder(inputMapTypeOfRoot, "routes").build();
ParameterSpec groupParamSpec = ParameterSpec.builder(inputMapTypeOfGroup, "atlas").build();
ParameterSpec providerParamSpec = ParameterSpec.builder(inputMapTypeOfGroup, "providers").build(); // Ps. its param type same as groupParamSpec!
// 声明 public void loadInto(Map> routes)
MethodSpec.Builder loadIntoMethodOfRootBuilder = MethodSpec.methodBuilder(METHOD_LOAD_INTO)
.addAnnotation(Override.class)
.addModifiers(PUBLIC)
.addParameter(rootParamSpec);
// 遍历所有申明的 @Route
for (Element element : routeElements) {
TypeMirror tm = element.asType();
Route route = element.getAnnotation(Route.class);
RouteMeta routeMeta;
// Activity or Fragment
if (types.isSubtype(tm, type_Activity) || types.isSubtype(tm, fragmentTm) || types.isSubtype(tm, fragmentTmV4)) {
// Get all fields annotation by @Autowired
Map paramsType = new HashMap<>();
Map injectConfig = new HashMap<>();
//【遍历解析@Autowired属性，根据 @Autowired 声明的名字做key, 缓存数据类型的 index 值，存入paramsType】
injectParamCollector(element, paramsType, injectConfig);
// 创建 RouteMeta 对象
if (types.isSubtype(tm, type_Activity)) {
// Activity
logger.info(">>> Found activity route: " + tm.toString() + " <<<");
routeMeta = new RouteMeta(route, element, RouteType.ACTIVITY, paramsType);
} else {
// Fragment
logger.info(">>> Found fragment route: " + tm.toString() + " <<<");
routeMeta = new RouteMeta(route, element, RouteType.parse(FRAGMENT), paramsType);
}
routeMeta.setInjectConfig(injectConfig);
} else if (types.isSubtype(tm, iProvider)) { // IProvider
logger.info(">>> Found provider route: " + tm.toString() + " <<<");
routeMeta = new RouteMeta(route, element, RouteType.PROVIDER, null);
} else if (types.isSubtype(tm, type_Service)) { // Service
logger.info(">>> Found service route: " + tm.toString() + " <<<");
routeMeta = new RouteMeta(route, element, RouteType.parse(SERVICE), null);
} else {
throw new RuntimeException("The @Route is marked on unsupported class, look at [" + tm.toString() + "].");
}
// 这个方法就是把 route 按照 group 分组保存到 groupMap( Map>
categories(routeMeta);
}
// 声明这个方法 public void loadInto(Map providers)
MethodSpec.Builder loadIntoMethodOfProviderBuilder = MethodSpec.methodBuilder(METHOD_LOAD_INTO)
.addAnnotation(Override.class)
.addModifiers(PUBLIC)
.addParameter(providerParamSpec);
Map> docSource = new HashMap<>();
// 开始生成代码, 遍历刚才生成的 groupMap
for (Map.Entry> entry : groupMap.entrySet()) {
String groupName = entry.getKey();
// 声明方法 public void loadInto(Map atlas)
MethodSpec.Builder loadIntoMethodOfGroupBuilder = MethodSpec.methodBuilder(METHOD_LOAD_INTO)
.addAnnotation(Override.class)
.addModifiers(PUBLIC)
.addParameter(groupParamSpec);
List routeDocList = new ArrayList<>();
// 遍历 group 内保存的 routes
Set groupData = entry.getValue();
for (RouteMeta routeMeta : groupData) {
RouteDoc routeDoc = extractDocInfo(routeMeta);
ClassName className = ClassName.get((TypeElement) routeMeta.getRawType());
switch (routeMeta.getType()) {
case PROVIDER: // Need cache provider's super class
List interfaces = ((TypeElement) routeMeta.getRawType()).getInterfaces();
// 生成方法内代码, 例如下面
// providers.put("com.alibaba.android.arouter.demo.testservice.HelloService", RouteMeta.build(RouteType.PROVIDER, HelloServiceImpl.class, "/service/hello", "service", null, -1, -2147483648));
for (TypeMirror tm : interfaces) {
routeDoc.addPrototype(tm.toString());
if (types.isSameType(tm, iProvider)) { // Its implements iProvider interface himself.
// This interface extend the IProvider, so it can be used for mark provider
loadIntoMethodOfProviderBuilder.addStatement(
"providers.put($S, $T.build($T." + routeMeta.getType() + ", $T.class, $S, $S, null, " + routeMeta.getPriority() + ", " + routeMeta.getExtra() + "))",
(routeMeta.getRawType()).toString(),
routeMetaCn,
routeTypeCn,
className,
routeMeta.getPath(),
routeMeta.getGroup());
} else if (types.isSubtype(tm, iProvider)) {
// This interface extend the IProvider, so it can be used for mark provider
loadIntoMethodOfProviderBuilder.addStatement(
"providers.put($S, $T.build($T." + routeMeta.getType() + ", $T.class, $S, $S, null, " + routeMeta.getPriority() + ", " + routeMeta.getExtra() + "))",
tm.toString(), // So stupid, will duplicate only save class name.
routeMetaCn,
routeTypeCn,
className,
routeMeta.getPath(),
routeMeta.getGroup());
}
}
break;
default:
break;
}
// 生成配置的参数类型 map
// 例如 : put("pac", 9); put("obj", 10); put("name", 8); put("boy", 0);
StringBuilder mapBodyBuilder = new StringBuilder();
Map paramsType = routeMeta.getParamsType();
Map injectConfigs = routeMeta.getInjectConfig();
if (MapUtils.isNotEmpty(paramsType)) {
List paramList = new ArrayList<>();
for (Map.Entry types : paramsType.entrySet()) {
mapBodyBuilder.append("put("").append(types.getKey()).append("", ").append(types.getValue()).append("); ");
RouteDoc.Param param = new RouteDoc.Param();
Autowired injectConfig = injectConfigs.get(types.getKey());
param.setKey(types.getKey());
param.setType(TypeKind.values()[types.getValue()].name().toLowerCase());
param.setDescription(injectConfig.desc());
param.setRequired(injectConfig.required());
paramList.add(param);
}
routeDoc.setParams(paramList);
}
String mapBody = mapBodyBuilder.toString();
// 生成方法内代码
// atlas.put("/test/activity2", RouteMeta.build(RouteType.ACTIVITY, Test2Activity.class, "/test/activity2", "test", new java.util.HashMap(){{put("key1", 8); }}, -1, -2147483648));
loadIntoMethodOfGroupBuilder.addStatement(
"atlas.put($S, $T.build($T." + routeMeta.getType() + ", $T.class, $S, $S, " + (StringUtils.isEmpty(mapBody) ? null : ("new java.util.HashMap(){{" + mapBodyBuilder.toString() + "}}")) + ", " + routeMeta.getPriority() + ", " + routeMeta.getExtra() + "))",
routeMeta.getPath(),
routeMetaCn,
routeTypeCn,
className,
routeMeta.getPath().toLowerCase(),
routeMeta.getGroup().toLowerCase());
routeDoc.setClassName(className.toString());
routeDocList.add(routeDoc);
}
// 生成 java 文件, 例如 ARouter$$Group$$test.java, ARouter$$Group$$service.java
String groupFileName = NAME_OF_GROUP + groupName;
JavaFile.builder(PACKAGE_OF_GENERATE_FILE,
TypeSpec.classBuilder(groupFileName)
.addJavadoc(WARNING_TIPS)
.addSuperinterface(ClassName.get(type_IRouteGroup))
.addModifiers(PUBLIC)
.addMethod(loadIntoMethodOfGroupBuilder.build())
.build()
).build().writeTo(mFiler);
logger.info(">>> Generated group: " + groupName + "<<<");
// 缓存文件名
rootMap.put(groupName, groupFileName);
docSource.put(groupName, routeDocList);
}
// 生成 ARouter$$Root$$app.java 里的代码
if (MapUtils.isNotEmpty(rootMap)) {
// Generate root meta by group name, it must be generated before root, then I can find out the class of group.
for (Map.Entry entry : rootMap.entrySet()) {
// 生成代码 : routes.put("service", ARouter$$Group$$service.class);
loadIntoMethodOfRootBuilder.addStatement("routes.put($S, $T.class)", entry.getKey(), ClassName.get(PACKAGE_OF_GENERATE_FILE, entry.getValue()));
}
}
// Output route doc
if (generateDoc) {
docWriter.append(JSON.toJSONString(docSource, SerializerFeature.PrettyFormat));
docWriter.flush();
docWriter.close();
}
// 生成 providers java 文件. 例如 ARouter$$Providers$$app.java
String providerMapFileName = NAME_OF_PROVIDER + SEPARATOR + moduleName;
JavaFile.builder(PACKAGE_OF_GENERATE_FILE,
TypeSpec.classBuilder(providerMapFileName)
.addJavadoc(WARNING_TIPS)
.addSuperinterface(ClassName.get(type_IProviderGroup))
.addModifiers(PUBLIC)
.addMethod(loadIntoMethodOfProviderBuilder.build())
.build()
).build().writeTo(mFiler);
logger.info(">>> Generated provider map, name is " + providerMapFileName + " <<<");
// 生成 root java 文件. 例如 ARouter$$Root$$app.java
String rootFileName = NAME_OF_ROOT + SEPARATOR + moduleName;
JavaFile.builder(PACKAGE_OF_GENERATE_FILE,
TypeSpec.classBuilder(rootFileName)
.addJavadoc(WARNING_TIPS)
.addSuperinterface(ClassName.get(elementUtils.getTypeElement(ITROUTE_ROOT)))
.addModifiers(PUBLIC)
.addMethod(loadIntoMethodOfRootBuilder.build())
.build()
).build().writeTo(mFiler);
logger.info(">>> Generated root, name is " + rootFileName + " <<<");
}
}
最终生成文件代码：
public class ARouter$$Group$$test implements IRouteGroup {
@Override
public void loadInto(Map atlas) {
atlas.put("/test/activity1", RouteMeta.build(RouteType.ACTIVITY, Test1Activity.class, "/test/activity1", "test", new java.util.HashMap(){{put("ser", 9); put("ch", 5); put("fl", 6); put("dou", 7); put("boy", 0); put("url", 8); put("pac", 10); put("obj", 11); put("name", 8); put("objList", 11); put("map", 11); put("age", 3); put("height", 3); }}, -1, -2147483648));
atlas.put("/test/activity2", RouteMeta.build(RouteType.ACTIVITY, Test2Activity.class, "/test/activity2", "test", new java.util.HashMap(){{put("key1", 8); }}, -1, -2147483648));
atlas.put("/test/activity3", RouteMeta.build(RouteType.ACTIVITY, Test3Activity.class, "/test/activity3", "test", new java.util.HashMap(){{put("name", 8); put("boy", 0); put("age", 3); }}, -1, -2147483648));
atlas.put("/test/activity4", RouteMeta.build(RouteType.ACTIVITY, Test4Activity.class, "/test/activity4", "test", null, -1, -2147483648));
atlas.put("/test/fragment", RouteMeta.build(RouteType.FRAGMENT, BlankFragment.class, "/test/fragment", "test", new java.util.HashMap(){{put("ser", 9); put("pac", 10); put("ch", 5); put("obj", 11); put("fl", 6); put("name", 8); put("dou", 7); put("boy", 0); put("objList", 11); put("map", 11); put("age", 3); put("height", 3); }}, -1, -2147483648));
atlas.put("/test/webview", RouteMeta.build(RouteType.ACTIVITY, TestWebview.class, "/test/webview", "test", null, -1, -2147483648));
}
public class ARouter$$Group$$yourservicegroupname implements IRouteGroup {
@Override
public void loadInto(Map atlas) {
atlas.put("/yourservicegroupname/hello", RouteMeta.build(RouteType.PROVIDER, HelloServiceImpl.class, "/yourservicegroupname/hello", "yourservicegroupname", null, -1, -2147483648));
atlas.put("/yourservicegroupname/json", RouteMeta.build(RouteType.PROVIDER, JsonServiceImpl.class, "/yourservicegroupname/json", "yourservicegroupname", null, -1, -2147483648));
atlas.put("/yourservicegroupname/single", RouteMeta.build(RouteType.PROVIDER, SingleService.class, "/yourservicegroupname/single", "yourservicegroupname", null, -1, -2147483648));
}
}
}
总结RouteProcessor做了那些事：
- 根据 @Route 配置 path, group 生成 ARouter$$Root$$"moduleName"
- ARouter$$Root$$xxxx.java 以 group 为 key, 注入了生成的 ARouter$$Group$$xxxx 类
- 根据 @Route 配置 生成 ARouter$$Providers$$"groupName" 和 ARouter$$Group$$"groupName"
- ARouter$$Providers$$xxxx.java 以类为 key, 注入了 IProvider 接口的实现类
- ARouter$$Group$$xxxx.java 以 path 为 key, 注入 RouteMate实例, 描述实现类和 @Autowired 参数描述
RouteProcessor完成了ARouter注解解析生成代码大部分工作；
InterceptorProcessor.process方法
if (CollectionUtils.isNotEmpty(annotations)) {
Set elements = roundEnv.getElementsAnnotatedWith(Interceptor.class);
try {
parseInterceptors(elements);
} catch (Exception e) {
logger.error(e);
}
return true;
}
return false;
parseInterceptors方法
private void parseInterceptors(Set elements) throws IOException {
if (CollectionUtils.isNotEmpty(elements)) {
logger.info(">>> Found interceptors, size is " + elements.size() + " <<<");
// Verify and cache, sort incidentally.
for (Element element : elements) {
// 验证必需实现了 IInterceptor 接口
if (verify(element)) {
logger.info("A interceptor verify over, its " + element.asType());
Interceptor interceptor = element.getAnnotation(Interceptor.class);
// 根据配置 @Interceptor 的 priority, 返回是否有重复配置的拦截器, 如果有抛出错误
Element lastInterceptor = interceptors.get(interceptor.priority());
if (null != lastInterceptor) {
throw new IllegalArgumentException(
String.format(Locale.getDefault(), "More than one interceptors use same priority [%d], They are [%s] and [%s].",
interceptor.priority(),
lastInterceptor.getSimpleName(),
element.getSimpleName())
);
}
interceptors.put(interceptor.priority(), element);
} else {
logger.error("A interceptor verify failed, its " + element.asType());
}
}
// Interface of ARouter.
TypeElement type_ITollgate = elementUtils.getTypeElement(IINTERCEPTOR);
TypeElement type_ITollgateGroup = elementUtils.getTypeElement(IINTERCEPTOR_GROUP);
// 声明类型 Map>
ParameterizedTypeName inputMapTypeOfTollgate = ParameterizedTypeName.get(
ClassName.get(Map.class),
ClassName.get(Integer.class),
ParameterizedTypeName.get(
ClassName.get(Class.class),
WildcardTypeName.subtypeOf(ClassName.get(type_ITollgate))
)
);
// 方法参数 interceptors
ParameterSpec tollgateParamSpec = ParameterSpec.builder(inputMapTypeOfTollgate, "interceptors").build();
// 声明方法 loadInto
MethodSpec.Builder loadIntoMethodOfTollgateBuilder = MethodSpec.methodBuilder(METHOD_LOAD_INTO)
.addAnnotation(Override.class)
.addModifiers(PUBLIC)
.addParameter(tollgateParamSpec);
// 生成方法内代码, 例如 : interceptors.put(7, Test1Interceptor.class);
if (null != interceptors && interceptors.size() > 0) {
// Build method body
for (Map.Entry entry : interceptors.entrySet()) {
loadIntoMethodOfTollgateBuilder.addStatement("interceptors.put(" + entry.getKey() + ", $T.class)", ClassName.get((TypeElement) entry.getValue()));
}
}
// 生成 Interceptor 的注入代码, 继承了 IInterceptorGroup. 例如 ARouter$$Interceptors$$app.java
JavaFile.builder(PACKAGE_OF_GENERATE_FILE,
TypeSpec.classBuilder(NAME_OF_INTERCEPTOR + SEPARATOR + moduleName)
.addModifiers(PUBLIC)
.addJavadoc(WARNING_TIPS)
.addMethod(loadIntoMethodOfTollgateBuilder.build())
.addSuperinterface(ClassName.get(type_ITollgateGroup))
.build()
).build().writeTo(mFiler);
logger.info(">>> Interceptor group write over. <<<");
}
}
最终生成文件代码：
* DO NOT EDIT THIS FILE!!! IT WAS GENERATED BY AROUTER. */
public class ARouter$$Interceptors$$modulejava implements IInterceptorGroup {
@Override
public void loadInto(Map> interceptors) {
interceptors.put(7, Test1Interceptor.class);
interceptors.put(90, TestInterceptor90.class);
}
}
InterceptorProcessor 就是生成注入拦截器的代码, 拦截器有优先级, 并且一个优先级只能一个拦截器；
AutowiredProcessor注解处理器源码分析 public boolean process(Set set, RoundEnvironment roundEnvironment) {
categories(roundEnvironment.getElementsAnnotatedWith(Autowired.class));
generateHelper();
}
private void categories(Set elements) throws IllegalAccessException {
for (Element element : elements) {
TypeElement enclosingElement = (TypeElement) element.getEnclosingElement();
// @Autowired不能修饰 private
if (element.getModifiers().contains(Modifier.PRIVATE)) {
throw new IllegalAccessException("The autowired fields CAN NOT BE 'private'!!! please check field ["
+ element.getSimpleName() + "] in class [" + enclosingElement.getQualifiedName() + "]");
}
// 根据声明的类分组缓存
if (parentAndChild.containsKey(enclosingElement)) {
parentAndChild.get(enclosingElement).add(element);
} else {
List childs = new ArrayList<>();
childs.add(element);
parentAndChild.put(enclosingElement, childs);
}
}
}
private void generateHelper() throws IOException, IllegalAccessException {
// 声明方法参数 Object target
ParameterSpec objectParamSpec = ParameterSpec.builder(TypeName.OBJECT, "target").build();
// 遍历前面分析后的 parentAndChild
for (Map.Entry> entry : parentAndChild.entrySet()) {
// 声明方法 public void inject(Object target)
MethodSpec.Builder injectMethodBuilder = MethodSpec.methodBuilder(METHOD_INJECT)
.addAnnotation(Override.class)
.addModifiers(PUBLIC)
.addParameter(objectParamSpec);
TypeElement parent = entry.getKey();
List childs = entry.getValue();
String qualifiedName = parent.getQualifiedName().toString();
String packageName = qualifiedName.substring(0, qualifiedName.lastIndexOf("."));
// 类名 : com.alibaba.android.arouter.demo.testactivity.Test1Activity
// 生成 : com.alibaba.android.arouter.demo.testactivity.Test1Activity$$ARouter$$Autowired
String fileName = parent.getSimpleName() + NAME_OF_AUTOWIRED;
// 声明 public class Test1Activity$$ARouter$$Autowired implements ISyringe
TypeSpec.Builder helper = TypeSpec.classBuilder(fileName)
.addJavadoc(WARNING_TIPS)
.addSuperinterface(ClassName.get(type_ISyringe))
.addModifiers(PUBLIC);
// 声明变量 private SerializationService serializationService;
FieldSpec jsonServiceField = FieldSpec.builder(TypeName.get(type_JsonService.asType()), "serializationService", Modifier.PRIVATE).build();
helper.addField(jsonServiceField);
// 生成代码 : serializationService = (SerializationService)ARouter.getInstance().navigation(SerializationService.class);
injectMethodBuilder.addStatement("serializationService = $T.getInstance().navigation($T.class);", ARouterClass, ClassName.get(type_JsonService));
// 生成代码 : Test1Activity substitute = (Test1Activity)target;
injectMethodBuilder.addStatement("$T substitute = ($T)target", ClassName.get(parent), ClassName.get(parent));
// 生成自动注入的代码
for (Element element : childs) {
Autowired fieldConfig = element.getAnnotation(Autowired.class);
String fieldName = element.getSimpleName().toString();
if (types.isSubtype(element.asType(), iProvider)) {
if ("".equals(fieldConfig.name())) {
// 生成代码 : substitute.helloService = (HelloService)ARouter.getInstance().navigation(HelloService.class);
injectMethodBuilder.addStatement(
"substitute." + fieldName + " = $T.getInstance().navigation($T.class)",
ARouterClass,
ClassName.get(element.asType())
);
} else {
// 生成代码 : substitute.helloService = (HelloService)ARouter.getInstance().build("/test/hello").navigation();
injectMethodBuilder.addStatement(
"substitute." + fieldName + " = ($T)$T.getInstance().build($S).navigation();",
ClassName.get(element.asType()),
ARouterClass,
fieldConfig.name()
);
}
} else {
String statment = "substitute." + fieldName + " = substitute.";
boolean isActivity = false;
if (types.isSubtype(parent.asType(), activityTm)) {
isActivity = true;
// activity 直接用getIntent()
statment += "getIntent().";
} else if (types.isSubtype(parent.asType(), fragmentTm) || types.isSubtype(parent.asType(), fragmentTmV4)) {
// fragment 直接用getArguments()
statment += "getArguments().";
} else {
throw new IllegalAccessException("The field [" + fieldName + "] need autowired from intent, its parent must be activity or fragment!");
}
// 生成注入代码
statment = buildStatement(statment, typeUtils.typeExchange(element), isActivity);
// 判断serializationService注入
if (statment.startsWith("serializationService.")) {
injectMethodBuilder.beginControlFlow("if (null != serializationService)");
injectMethodBuilder.addStatement(
"substitute." + fieldName + " = " + statment,
(StringUtils.isEmpty(fieldConfig.name()) ? fieldName : fieldConfig.name()),
ClassName.get(element.asType())
);
injectMethodBuilder.nextControlFlow("else");
injectMethodBuilder.addStatement(
"$T.e("" + Consts.TAG + "", "You want automatic inject the field '" + fieldName + "' in class '$T' , then you should implement 'SerializationService' to support object auto inject!")", AndroidLog, ClassName.get(parent));
injectMethodBuilder.endControlFlow();
} else {
injectMethodBuilder.addStatement(statment, StringUtils.isEmpty(fieldConfig.name()) ? fieldName : fieldConfig.name());
}
}
}
helper.addMethod(injectMethodBuilder.build());
// 生成 Autowired 的注入代码, 继承了 ISyringe. 例如 Test1Activity$$ARouter$$Autowired.java
JavaFile.builder(packageName, helper.build()).build().writeTo(mFiler);
}
}
总结
编译期 arouter-compiler 负责生成了注入的的一些代码;
- ARouter$$Group$$group-name 以 group-name 为文件名注入该 group 下声明了@Route的信息
- ARouter$$Root$$app 按照 group分组注入了ARouter$$Group$$group-name
- ARouter$$Providers$$app 注入实现IProvider接口的信息
- ARouter$$Interceptors$$app 注入实现IInterceptor接口信息
- Test1Activity$$ARouter$$Autowired@Autowired自动注入的实现
下一节我们接着学习ARouter源码，分析如何实现activity间的跳转逻辑ARouter原理解析之路由跳转；
结语如果以上文章对您有一点点帮助，希望您不要吝啬的点个赞加个关注，您每一次小小的举动都是我坚持写作的不懈动力！ღ( ´･ᴗ･` )
