一、前言

由于用户在开发者选项中关闭了动画的效果，导致App的动画不生效。但是有的App动画效果被关闭了，还依旧能有动画效果产生，这就让我们的用户觉得这是个BUG😀。于是，就有这个问题的解决方案。

开发者选项关闭动画如下：

（关于为什么用户要关闭动画效果？baidu一下，原因竟然是因为能提升手机的流畅度😭😭😭 ）

二、如何解决？

工具类

public class ValueAnimatorUtil {private static String TAG = "ValueAnimatorUtil";/*** 如果动画被禁用，则重置动画缩放时长*/public static void resetDurationScaleIfDisable() {if (getDurationScale() == 0)resetDurationScale();}/*** 重置动画缩放时长*/public static void resetDurationScale() {try {getField().setFloat(null, 1);} catch (Exception e) {e.printStackTrace();}}private static float getDurationScale() {try {return getField().getFloat(null);} catch (Exception e) {e.printStackTrace();return -1;}}@NonNullprivate static Field getField() throws NoSuchFieldException {Field field = ValueAnimator.class.getDeclaredField("sDurationScale");field.setAccessible(true);return field;}
}

怎么使用？

在Activity的onCreate方法中调用如下代码：

ValueAnimatorUtil.resetDurationScaleIfDisable()

 注意：以上代码只能在 targetSdkVersion为28或者以下生效，原因如下：

 可以看到，在我们需要反射的字段sDurationScale，多了UnsupportedAppUsage注解。

这是因为Google官方在Android P（Android9.0版本）开始针对非 SDK 接口的限制。也就是说，以前你系统的接口通过反射就能调用，现在都不能通过反射获取。

具体被限制的接口名单可以查看这里

所谓道高一尺魔高一丈，既然Google限制了我们，那就肯定会有大佬去解决问题，一起往下看如何突破Android P 接口限制。

三、如何突破Android P接口限制？

如何突破的原理可以看最后提供的参考链接，这篇文章主要讲如何使用。

第一步：将下面仓库地址代码添加到你的根 build.gradle 中：

allprojects {repositories {...maven { url 'https://jitpack.io' }}}

第二步：将下面代码添加到你的主模块build.gradle中：

implementation 'com.github.tiann:FreeReflection:3.1.0'

第三步：在你的Application中加入如下代码：

public class MyApplication extends Application {@Overrideprotected void attachBaseContext(Context base) {super.attachBaseContext(base);Reflection.unseal(base);}
}

最后，重新编译运行，在targetSdkVersion为28以上的版本都能修改sDurationScale成功。

四、分析源码

突破Andriod P限制仓库地址

可以把上面第三方SDK源码下载到本地，可以发现，核心代码量就十几行。主要文件就两个

BootstrapClass 和 Reflection，其中关于CPP的代码应该是旧的突破Android P限制的方法。
源码截图如下：

源码分析 

源码核心目的：

• 通过反射调用 VMRuntime.setHiddenApiExemptions，把我们需要解除限制的方法传入，就能将我们自己要使用的隐藏 API 全部都豁免掉了。
• 我们所有Java方法类的签名都是以 L开头，只要直接传个 L进去，所有隐藏API就会被全部解除限制。

开始从源码分析他是如何使用的

第一步：先从 Reflection.unseal(base)调用开始

public static int unseal(Context context) {if (SDK_INT < 28) {// Below Android P, ignorereturn 0;}// try exempt API first.if (exemptAll()) {return 0;}if (unsealByDexFile(context)) {return 0;}return -1;}

可以看到，主要方法其实就两个，exemptAll和unsealByDexFile，先看下exemptAll方法。

第二步：exemptAll方法

public static boolean exemptAll() {return exempt(new String[]{"L"});}

可以看到，传入了一个字符串“L“，而这个L就是代表了所有的Java方法。继续往下看：

public static boolean exempt(String... methods) {if (sVmRuntime == null || setHiddenApiExemptions == null) {return false;}try {setHiddenApiExemptions.invoke(sVmRuntime, new Object[]{methods});return true;} catch (Throwable e) {return false;}}

 其实就是一个反射的调用setHiddenApiExemptions方法，我们看下setHiddenApiExemptions和sVnRuntime是如何获取的

public final class BootstrapClass {private static final String TAG = "BootstrapClass";private static Object sVmRuntime;private static Method setHiddenApiExemptions;static {if (SDK_INT >= Build.VERSION_CODES.P) {try {Method forName = Class.class.getDeclaredMethod("forName", String.class);Method getDeclaredMethod = Class.class.getDeclaredMethod("getDeclaredMethod", String.class, Class[].class);Class<?> vmRuntimeClass = (Class<?>) forName.invoke(null, "dalvik.system.VMRuntime");Method getRuntime = (Method) getDeclaredMethod.invoke(vmRuntimeClass, "getRuntime", null);setHiddenApiExemptions = (Method) getDeclaredMethod.invoke(vmRuntimeClass, "setHiddenApiExemptions", new Class[]{String[].class});sVmRuntime = getRuntime.invoke(null);} catch (Throwable e) {Log.w(TAG, "reflect bootstrap failed:", e);}}}

上面代码的目的是为了获取到 setHiddenApiExemptions，由于setHiddenApiExemptions是属于系统的方法，普通的用户是无法获取到的。dalvik.system.VMRuntime源码截图如下：

/*** Sets the list of exemptions from hidden API access enforcement.** @param signaturePrefixes*         A list of signature prefixes. Each item in the list is a prefix match on the type*         signature of a blacklisted API. All matching APIs are treated as if they were on*         the whitelist: access permitted, and no logging..** @hide*/@SystemApi(client = MODULE_LIBRARIES)public native void setHiddenApiExemptions(String[] signaturePrefixes);

注释里也说明了Sets the list of exemptions from hidden API access enforcement（设置隐藏 API 访问强制执行的豁免列表。）

需要我们把自己变成系统类，变成系统类的的核心代码主要就是这两句：

Method forName = Class.class.getDeclaredMethod("forName", String.class);
Method getDeclaredMethod = Class.class.getDeclaredMethod("getDeclaredMethod", String.class, Class[].class);

• 第一行，通过Class获取到自己的forName，用来反射获取类
• 第二行，通过Class获取到自己的getDeclaredMethod方法，用来反射调用方法 

看到这里你可能会有疑惑，通过反射去反射获取类的方法获取到getDeclaredMethod，然后再去反射调用其他方法，那为什么不直接通过getDeclaredMethod反射调用，还要多此一步呢？

这是因为我们之所以在Android P以上不能调用被系统隐藏的类，是因为我们不是系统类。也就是说，我们把自己变成系统类，那么我们就不会存在有接口的限制。

上面可能说的有点绕。简单的说，通过上面两行代码，你就能变成系统类，那么你就能获取。

提示：上面这个方法在Android 11及以上已经失效（在小米8和一加8的安卓版本10上测试通过），🤭实际调用的是下面的unsealByDexFile方法。

第三步：unsealByDexFile方法

代码如下：

    private static boolean unsealByDexFile(Context context) {//1.解码DEX字段，获取字节流byte[] bytes = Base64.decode(DEX, Base64.NO_WRAP);//2.将获取的字节流，写入到本地文件File codeCacheDir = getCodeCacheDir(context);if (codeCacheDir == null) {return false;}File code = new File(codeCacheDir, System.currentTimeMillis() + ".dex");try {try (FileOutputStream fos = new FileOutputStream(code)) {fos.write(bytes);}//3.执行自己生成的dex文件DexFile dexFile = new DexFile(code);//4.加载BootstrapClass类Class<?> bootstrapClass = dexFile.loadClass("me.weishu.reflection.BootstrapClass", null);//5.调用exemptAll方法Method exemptAll = bootstrapClass.getDeclaredMethod("exemptAll");return (boolean) exemptAll.invoke(null);}

 可以看到，这个方法的最终还是调用exemptAll。这个方法的作用主要是通过系统类去加载我们自己的Dex文件，而这个Dex文件其实就是我们FreeRelfection的源码。生成的Dex文件截图如下：

 说到这里，那我们能不能也自己生成一个？继续往下看

五、生成Dex文件

1.拷贝源码到自己项目下，如图（包名com.example.viewdemo）：

 2.将com.example.viewdemo下的代码打包成dex文件

这里可以看我另外一篇文章安卓中将Java文件转换成Dex文件_I'm a Android Dev的博客-CSDN博客

最终生成Hello.dex文件，也可以放到Android Studio打开查看。如下：

3.将Hello.dex文件编码成字符串

由于转换需要在Java工程里，需要创建一个Java工程。 可以将Hello.dex文件放在一起，截图如下：

注意：由于需要用到Android的Base64文件，所以需要拷贝Android的Base64文件到此。

代码如下：

public class FileUtil {public static void main(String[] args) {new Thread(){@Overridepublic void run() {String path = "D:\\20210426\\code\\otherCode\\ViewDemo\\lib\\src\\main\\java\\com\\example\\lib\\Hello.dex";byte[] bytesByFile = getBytesByFile(path);String DEX = Base64.encodeToString(bytesByFile, Base64.NO_WRAP);System.out.println("DEX: " + DEX);}}.start();}public static byte[] getBytesByFile(String pathStr) {File file = new File(pathStr);System.out.println("文件大小为: " + file.length());try {FileInputStream fis = new FileInputStream(file);ByteArrayOutputStream bos = new ByteArrayOutputStream(1024);byte[] b = new byte[1024];int n;while ((n = fis.read(b)) != -1) {bos.write(b, 0, n);}fis.close();byte[] data = bos.toByteArray();bos.close();return data;} catch (Exception e) {e.printStackTrace();}return null;}
}

运行后如下：

 将自己生成的DEX字符串拷贝到Reflection替换DEX字段，并且修改包名。如下：

private static final String DEX = "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";Class<?> bootstrapClass = dexFile.loadClass("com.example.viewdemo.BootstrapClass", null);

 最后运行App，设置依然生效。

本篇分享到此结束，说个题外话，文章中的获取元反射方法和DEX文件的生成，这些都是跟安卓的插件化息息相关的。学习需要互相联系。

参考链接：

Android ValueAnimator时长错乱或者不起作用的解决方法以及问题分析_陈小缘的博客-CSDN博客_valueanimator回调不正常

下面两篇是维术大佬关于Android P的限制的原理和解决方案，YYDS。

另一种绕过 Android P以上非公开API限制的办法 | Weishu's Notes 

一种绕过Android P对非SDK接口限制的简单方法 | Weishu's Notes