热修复 tinker接入及源码分析( 七 ) _源码

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找出仅支持art的dex，且当前patch是否仅适用于art时，并行去。
关键是最后的：
@SuppressLint("NewApi")public static void installDexes(Application application, PathClassLoader loader, File dexOptDir, List files)throws Throwable {if (!files.isEmpty()) {ClassLoader classLoader = loader;if (Build.VERSION.SDK_INT >= 24) {classLoader = AndroidNClassLoader.inject(loader, application);}//because in dalvik, if inner class is not the same classloader with it wrapper class.//it won't fail at dex2optif (Build.VERSION.SDK_INT >= 23) {V23.install(classLoader, files, dexOptDir);} else if (Build.VERSION.SDK_INT >= 19) {V19.install(classLoader, files, dexOptDir);} else if (Build.VERSION.SDK_INT >= 14) {V14.install(classLoader, files, dexOptDir);} else {V4.install(classLoader, files, dexOptDir);}//install donesPatchDexCount = files.size();Log.i(TAG, "after loaded classloader: " + classLoader + ", dex size:" + sPatchDexCount);if (!checkDexInstall(classLoader)) {//reset patch dexSystemClassLoaderAdder.uninstallPatchDex(classLoader);throw new TinkerRuntimeException(ShareConstants.CHECK_DEX_INSTALL_FAIL);}}}
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  这里实际上就是根据不同的系统版本，去反射处理。
  我们看一下V19的实现（主要我看了下本机只有个22的源码~）：
  private static final class V19 {private static void install(ClassLoader loader, List additionalClassPathEntries,File optimizedDirectory)throws IllegalArgumentException, IllegalAccessException,NoSuchFieldException, InvocationTargetException, NoSuchMethodException, IOException {Field pathListField = ShareReflectUtil.findField(loader, "pathList");Object dexPathList = pathListField.get(loader);ArrayList suppressedExceptions = new ArrayList();ShareReflectUtil.expandFieldArray(dexPathList, "dexElements", makeDexElements(dexPathList,new ArrayList(additionalClassPathEntries), optimizedDirectory,suppressedExceptions));if (suppressedExceptions.size() > 0) {for (IOException e : suppressedExceptions) {Log.w(TAG, "Exception in makeDexElement", e);throw e;}}}}
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