网站建设存在哪些问题,网站建设与网页设计制作教程,长春城市设施建设集团股份公司,普陀本地论坛前言继上一篇Android 路由实践#xff08;一#xff09;之后#xff0c;断更已经差不多一个月#xff0c;毕竟是年前的最后一个月#xff0c;各种事情扎堆#xff0c;直到近几天才稍微闲下来#xff0c;于是有了此文。简单回顾下#xff0c;上一篇文章中简单介绍了三种…前言 继上一篇Android 路由实践一之后断更已经差不多一个月毕竟是年前的最后一个月各种事情扎堆直到近几天才稍微闲下来于是有了此文。简单回顾下上一篇文章中简单介绍了三种实现路由的方式分别是隐式的Intent、通过初始化路由表的方式实现、通过注解。最后总结了下优缺点建议使用第二种今天我们讲下第四种为啥单开一篇文章呢因为第四种涉及到知识点有点多并且参考ButterKbife以及部分阿里巴巴ARouter的实现。大体思路 通过 annotationProcessor处理编译期注解在编译的时候给路由表注入数据这样在运行时通过annotationProcessor生成java代码并编译class文件。以下代码部分参考了Butterknife的实现/*** 自定义的编译期Processor用于生成xxx$$Router.java文件*/
AutoService(Processor.class)
public class RouterProcessor extends AbstractProcessor {/*** 文件相关的辅助类*/private Filer mFiler;/*** 元素相关的辅助类*/private Elements mElementUtils;/*** 日志相关的辅助类*/private Messager mMessager;/*** 解析的目标注解集合*/Overridepublic synchronized void init(ProcessingEnvironment processingEnv) {super.init(processingEnv);mElementUtils processingEnv.getElementUtils();mMessager processingEnv.getMessager();mFiler processingEnv.getFiler();}Overridepublic SetString getSupportedAnnotationTypes() {SetString types new LinkedHashSet();types.add(RouterTarget.class.getCanonicalName());return types;}Overridepublic SourceVersion getSupportedSourceVersion() {return SourceVersion.latestSupported();}Overridepublic boolean process(Set? extends TypeElement annotations, RoundEnvironment roundEnv) {mMessager.printMessage(Diagnostic.Kind.WARNING, processprocessprocessprocess);Set? extends Element routeElements roundEnv.getElementsAnnotatedWith(RouterTarget.class);for (Element element : routeElements) {String packageName element.getEnclosingElement().toString();String fullClassName element.toString();String className fullClassName.substring(fullClassName.indexOf(packageName) packageName.length() 1, fullClassName.length());/**// * 构建类// */try {RouterTarget annotation element.getAnnotation(RouterTarget.class);RouterByAnnotationManager.getInstance().addRouter(annotation.value(), element.toString());mMessager.printMessage(Diagnostic.Kind.WARNING, RouterByAnnotationManager.getInstance().getRouter(annotation.value()) RouterByAnnotationManager.getInstance());FieldSpec routerKey FieldSpec.builder(String.class, routerKey, Modifier.FINAL, Modifier.PRIVATE).initializer($S, annotation.value()).build();FieldSpec clazz FieldSpec.builder(String.class, fullClassName, Modifier.FINAL, Modifier.PRIVATE).initializer($S, fullClassName).build();/*** 构建方法*/MethodSpec methodSpec MethodSpec.methodBuilder(injectRouter).addModifiers(Modifier.PUBLIC).addAnnotation(Override.class).addCode(com.example.commonlib.RouterByAnnotationManager.getInstance().addRouter($L,$L);, routerKey, fullClassName).build();TypeSpec finderClass TypeSpec.classBuilder(className $$Router).addModifiers(Modifier.PUBLIC).addMethod(methodSpec).addField(routerKey).addField(clazz).addSuperinterface(RouterInjector.class).build();JavaFile.builder(packageName, finderClass).build().writeTo(mFiler);} catch (Exception e) {error(processBindView, e.getMessage());}}return true;}public String getPackageName(TypeElement type) {return mElementUtils.getPackageOf(type).getQualifiedName().toString();}private void error(String msg, Object... args) {mMessager.printMessage(Diagnostic.Kind.ERROR, String.format(msg, args));}private void info(String msg, Object... args) {mMessager.printMessage(Diagnostic.Kind.NOTE, String.format(msg, args));}
}复制代码注意getSupportedAnnotationTypes()如果你要对那些类进行处理就要把Class的类名加入到Set中并且返回。然后看下process()方法里面利用javaPoet生成java文件文件形如UserInfoActivity$$Router,内容如下import java.lang.Override;
import java.lang.String;public class UserInfoActivity$$Router implements RouterInjector {private final String routerKey android.intent.action.USERINFO;private final String fullClassName com.example.userlib.UserInfoActivity;Overridepublic void injectRouter() {com.example.commonlib.RouterByAnnotationManager.getInstance().addRouter(routerKey,fullClassName);}
}
复制代码那么相信重点来了怎么去调用injectRouter()方法将数据注入到路由表中到这里的时候差点因为这个问题前功尽弃最后祭出了阿里大法参考了ARouter的实现。具体如下通过Application对Router进行初始化public class RouterApplication extends Application {Overridepublic void onCreate() {super.onCreate();//初始化路由Router.init(this);}
}复制代码Router初始化的时候通过反射将数据注入到路由表public static void init(Application application) {try {SetString classNames ClassUtils.getFileNameByPackageName(application, ActionConstant.SUFFIX);for (String className : classNames) {RouterFinder.bind(className);}} catch (PackageManager.NameNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} catch (InterruptedException e) {e.printStackTrace();}}复制代码来看下阿里ARouter的反射帮助类**这个类是从alibaba的ARouter复制过来的用来扫描所有的类等*/
public class ClassUtils {private static final String EXTRACTED_NAME_EXT .classes;private static final String EXTRACTED_SUFFIX .zip;private static final String SECONDARY_FOLDER_NAME code_cache File.separator secondary-dexes;private static final String PREFS_FILE multidex.version;private static final String KEY_DEX_NUMBER dex.number;private static final int VM_WITH_MULTIDEX_VERSION_MAJOR 2;private static final int VM_WITH_MULTIDEX_VERSION_MINOR 1;private static SharedPreferences getMultiDexPreferences(Context context) {return context.getSharedPreferences(PREFS_FILE, Build.VERSION.SDK_INT Build.VERSION_CODES.HONEYCOMB ? Context.MODE_PRIVATE : Context.MODE_PRIVATE | Context.MODE_MULTI_PROCESS);}/*** 通过指定包名扫描包下面包含的所有的ClassName** param context U know* param suffix 包名* return 所有class的集合*/public static SetString getFileNameByPackageName(Context context, final String suffix) throws PackageManager.NameNotFoundException, IOException, InterruptedException {final SetString classNames new HashSet();ListString paths getSourcePaths(context);final CountDownLatch parserCtl new CountDownLatch(paths.size());for (final String path : paths) {RouterPoolExecutor.getInstance().execute(new Runnable() {Overridepublic void run() {DexFile dexfile null;try {if (path.endsWith(EXTRACTED_SUFFIX)) {//NOT use new DexFile(path), because it will throw permission error in /data/dalvik-cachedexfile DexFile.loadDex(path, path .tmp, 0);} else {dexfile new DexFile(path);}EnumerationString dexEntries dexfile.entries();while (dexEntries.hasMoreElements()) {String className dexEntries.nextElement();if (className.endsWith(suffix)) {classNames.add(className);}}} catch (Throwable ignore) {Log.e(ARouter, Scan map file in dex files made error., ignore);} finally {if (null ! dexfile) {try {dexfile.close();} catch (Throwable ignore) {}}parserCtl.countDown();}}});}parserCtl.await();Log.e(getFileNameByPackage, Filter classNames.size() classes by packageName suffix );return classNames;}/*** get all the dex path** param context the application context* return all the dex path* throws PackageManager.NameNotFoundException* throws IOException*/public static ListString getSourcePaths(Context context) throws PackageManager.NameNotFoundException, IOException {ApplicationInfo applicationInfo context.getPackageManager().getApplicationInfo(context.getPackageName(), 0);File sourceApk new File(applicationInfo.sourceDir);ListString sourcePaths new ArrayList();sourcePaths.add(applicationInfo.sourceDir); //add the default apk path//the prefix of extracted file, ie: test.classesString extractedFilePrefix sourceApk.getName() EXTRACTED_NAME_EXT;// 如果VM已经支持了MultiDex就不要去Secondary Folder加载 Classesx.zip了那里已经么有了
// 通过是否存在sp中的multidex.version是不准确的因为从低版本升级上来的用户是包含这个sp配置的if (!isVMMultidexCapable()) {//the total dex numbersint totalDexNumber getMultiDexPreferences(context).getInt(KEY_DEX_NUMBER, 1);File dexDir new File(applicationInfo.dataDir, SECONDARY_FOLDER_NAME);for (int secondaryNumber 2; secondaryNumber totalDexNumber; secondaryNumber) {//for each dex file, ie: test.classes2.zip, test.classes3.zip...String fileName extractedFilePrefix secondaryNumber EXTRACTED_SUFFIX;File extractedFile new File(dexDir, fileName);if (extractedFile.isFile()) {sourcePaths.add(extractedFile.getAbsolutePath());//we ignore the verify zip part} else {throw new IOException(Missing extracted secondary dex file extractedFile.getPath() );}}}sourcePaths.addAll(tryLoadInstantRunDexFile(applicationInfo));return sourcePaths;}/*** Get instant run dex path, used to catch the branch usingApkSplitsfalse.*/private static ListString tryLoadInstantRunDexFile(ApplicationInfo applicationInfo) {ListString instantRunSourcePaths new ArrayList();if (Build.VERSION.SDK_INT Build.VERSION_CODES.LOLLIPOP null ! applicationInfo.splitSourceDirs) {// add the split apk, normally for InstantRun, and newest version.instantRunSourcePaths.addAll(Arrays.asList(applicationInfo.splitSourceDirs));Log.d(tryLoadInstantRunDex, Found InstantRun support);} else {try {// This man is reflection from Google instant run sdk, he will tell me where the dex files go.Class pathsByInstantRun Class.forName(com.android.tools.fd.runtime.Paths);Method getDexFileDirectory pathsByInstantRun.getMethod(getDexFileDirectory, String.class);String instantRunDexPath (String) getDexFileDirectory.invoke(null, applicationInfo.packageName);File instantRunFilePath new File(instantRunDexPath);if (instantRunFilePath.exists() instantRunFilePath.isDirectory()) {File[] dexFile instantRunFilePath.listFiles();for (File file : dexFile) {if (null ! file file.exists() file.isFile() file.getName().endsWith(.dex)) {instantRunSourcePaths.add(file.getAbsolutePath());}}Log.d(tryLoadInstantRunDex, Found InstantRun support);}} catch (Exception e) {Log.d(tryLoadInstantRunDex, InstantRun support error, e.getMessage());}}return instantRunSourcePaths;}/*** 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需要特殊判断vmName YunOS;isMultidexCapable Integer.valueOf(System.getProperty(ro.build.version.sdk)) 21;} else { // 非YunOS原生AndroidvmName 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(isVMMultidexCapable, VM with name vmName (isMultidexCapable ? has multidex support : does not have multidex support));return isMultidexCapable;}/*** 判断系统是否为YunOS系统*/private static boolean isYunOS() {try {String version System.getProperty(ro.yunos.version);String vmName System.getProperty(java.vm.name);return (vmName ! null vmName.toLowerCase().contains(lemur))|| (version ! null version.trim().length() 0);} catch (Exception ignore) {return false;}}
}复制代码注意看tryLoadInstantRunDexFile()这个方法记得在上一篇文章中说到资源路径获得DexFile,注意5.0以上版本要求关掉instant run 方法否则会自动拆包遍历不到所有activity类导致有些加了RouterTarget注解的Activity扫描不到Arouter在tryLoadInstantRunDexFile()解决了这个问题如果不调用这个方法的话只有如下图的apk:base.apk一般是不包括我们自己写的代码这个方法调用之后结果如下可以扫描到所有的apk之后接下来我们就可以解压出项目里面所有的类通过找出类名后缀为$$Router的类进行发射代码如下/*** 通过指定包名扫描包下面包含的所有的ClassName** param context U know* param suffix 包名* return 所有class的集合*/
public static SetString getFileNameByPackageName(Context context, final String suffix) throws PackageManager.NameNotFoundException, IOException, InterruptedException {final SetString classNames new HashSet();ListString paths getSourcePaths(context);final CountDownLatch parserCtl new CountDownLatch(paths.size());for (final String path : paths) {RouterPoolExecutor.getInstance().execute(new Runnable() {Overridepublic void run() {DexFile dexfile null;try {if (path.endsWith(EXTRACTED_SUFFIX)) {//NOT use new DexFile(path), because it will throw permission error in /data/dalvik-cachedexfile DexFile.loadDex(path, path .tmp, 0);} else {dexfile new DexFile(path);}EnumerationString dexEntries dexfile.entries();while (dexEntries.hasMoreElements()) {String className dexEntries.nextElement();if (className.endsWith(suffix)) {classNames.add(className);}}} catch (Throwable ignore) {Log.e(ARouter, Scan map file in dex files made error., ignore);} finally {if (null ! dexfile) {try {dexfile.close();} catch (Throwable ignore) {}}parserCtl.countDown();}}});}parserCtl.await();Log.e(getFileNameByPackage, Filter classNames.size() classes by packageName suffix );return classNames;
}复制代码注意这里 dexfile new DexFile(path);复制代码我们上一篇文章中建议不要使用因为安卓8.0已经打上了废弃标志但是既然阿里爸爸这么用了相信以后也会有相应的解决办法我们及时跟进如果读者有好的方法欢迎提出大家一起研究研究接下来就是反射调用injectRouter() public class RouterFinder {public RouterFinder() {throw new AssertionError(No .instances);}private static MapString, RouterInjector FINDER_MAP new HashMap();/*** 获取目标类** param className*/public static void inject(String className) {try {Log.e(inject,className);RouterInjector injector FINDER_MAP.get(className);if (injector null) {Class? finderClass Class.forName(className);injector (RouterInjector) finderClass.newInstance();FINDER_MAP.put(className, injector);}injector.injectRouter();} catch (Exception e) {}}}复制代码到此完成了路由表的数据填充具体使用如下new Router.Builder(this, RouterByAnnotationManager.getInstance().getRouter(ActionConstant.ACTION_USER_INFO)).addParams(ActionConstant.KEY_USER_NAME, etUserName.getText().toString()).addParams(ActionConstant.KEY_PASS_WORD, etPassWord.getText().toString()).go();复制代码到此完成了编译期路由的实现牵扯的东西还是挺多历经千辛万苦。代码github,喜欢的给个星吧
