替换 ${Android Sdk}/platforms/andorid-api/ 下的android.jar，之后sync一下。
-
能调用到不代表可以调用，例如黑名单api还是会受到上面限制
-
如果你是系统应用，或者有root权限可以无视以上限制
-
Android.jar的接口和当前AOSP接口保持一致，但是部分类会做修改，修改是添加旧系统接口，修改会添加在对应Jar包目录说明中,需要简短适配,例如：
final IPackageInstaller iPackageInstaller = AppGlobals.getPackageManager().getPackageInstaller();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
packageInstaller = new PackageInstaller(iPackageInstaller, null, null, UserHandle.myUserId());
} else {
packageInstaller = new PackageInstaller(iPackageInstaller, null, UserHandle.myUserId());
}
- 部分新版sdk接口的返回值可能和旧版sdk接口不同，那么如果不接收返回值，则可能导致编译正常运行报错，这种情况需要判断使用反射形式调用，例如:
//此方法在api29和28之前返回值不同
lockPatternUtils.saveLockPassword(it, null, DevicePolicyManager.PASSWORD_QUALITY_COMPLEX, UserHandle.myUserId())
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有调用提示，方法列表可以点出来
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减少适配成本，版本更新之后，不适配的方法会直接以错误的形式体现出来，不会如反射一样直接编译通过而运行时报错
-
无意中会学会更多知识，列出方法列表会更加接近源码，偶尔留下的印象也许会在某天突然融会贯通
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