解决 安卓9 签名校验报错

最近有客户反馈签名校验失败了，后来查看发现是安卓9的系统改了方法了，调用签名校验的方法时抛出了异常
java.lang.NoSuchMethodException: collectCertificates [class android.content.pm.PackageParser$Package, int]

查看源码发现
android-28的 PackageParser

public static void collectCertificates(Package pkg, boolean skipVerify)
        throws PackageParserException {
    collectCertificatesInternal(pkg, skipVerify);
    final int childCount = (pkg.childPackages != null) ? pkg.childPackages.size() : 0;
    for (int i = 0; i < childCount; i++) {
        Package childPkg = pkg.childPackages.get(i);
        childPkg.mSigningDetails = pkg.mSigningDetails;
    }
}

android-28以下的 PackageParser

public static void collectCertificates(Package pkg, int parseFlags)
        throws PackageParserException {
    collectCertificatesInternal(pkg, parseFlags);
    final int childCount = (pkg.childPackages != null) ? pkg.childPackages.size() : 0;
    for (int i = 0; i < childCount; i++) {
        Package childPkg = pkg.childPackages.get(i);
        childPkg.mCertificates = pkg.mCertificates;
        childPkg.mSignatures = pkg.mSignatures;
        childPkg.mSigningKeys = pkg.mSigningKeys;
    }
}

所以针对安卓9 修改了 签名校验方法如下：

public static String getAPKSignatures(String apkPath) {
    String PATH_PackageParser = "android.content.pm.PackageParser";
    try {
        // apk包的文件路径
        // 这是一个Package 解释器, 是隐藏的
        // 构造函数的参数只有一个, apk文件的路径
        // PackageParser packageParser = new PackageParser(apkPath);
        Class pkgParserCls = Class.forName(PATH_PackageParser);
        Class[] typeArgs = new Class[1];
        typeArgs[0] = String.class;
        // 这个是与显示有关的, 里面涉及到一些像素显示等等, 我们使用默认的情况
        DisplayMetrics metrics = new DisplayMetrics();
        metrics.setToDefaults();
        Constructor pkgParserCt = null;
        Object pkgParser = null;
        if(Build.VERSION.SDK_INT>20){
            pkgParserCt = pkgParserCls.getConstructor();
            pkgParser = pkgParserCt.newInstance();
            Method pkgParser_parsePackageMtd = pkgParserCls.getDeclaredMethod("parsePackage", File.class, int.class);
            Object pkgParserPkg = pkgParser_parsePackageMtd.invoke(pkgParser, new File(apkPath), PackageManager.GET_SIGNATURES);

　　　　　　　　if(Build.VERSION.SDK_INT>=28){
   　　　　　　　　Method pkgParser_collectCertificatesMtd = pkgParserCls.getDeclaredMethod("collectCertificates", pkgParserPkg.getClass(), Boolean.TYPE);
   　　　　　　　　pkgParser_collectCertificatesMtd.invoke(pkgParser, pkgParserPkg, Build.VERSION.SDK_INT>28);

                Method pkgParser_collectCertificatesMtd = pkgParserCls.getDeclaredMethod("collectCertificates", pkgParserPkg.getClass(), Boolean.TYPE);
                pkgParser_collectCertificatesMtd.invoke(pkgParser, pkgParserPkg, false);

                Field mSigningDetailsField = pkgParserPkg.getClass().getDeclaredField("mSigningDetails"); // SigningDetails
                mSigningDetailsField.setAccessible(true);

                Object mSigningDetails =  mSigningDetailsField.get(pkgParserPkg);
                Field infoField = mSigningDetails.getClass().getDeclaredField("signatures");
                infoField.setAccessible(true);
                Signature[] info = (Signature[]) infoField.get(mSigningDetails);
                return info[0].toCharsString();

            }else{
                Method pkgParser_collectCertificatesMtd = pkgParserCls.getDeclaredMethod("collectCertificates", pkgParserPkg.getClass(), Integer.TYPE);
                pkgParser_collectCertificatesMtd.invoke(pkgParser, pkgParserPkg, PackageManager.GET_SIGNATURES);
           
                Field packageInfoFld = pkgParserPkg.getClass().getDeclaredField("mSignatures");
                Signature[] info = (Signature[]) packageInfoFld.get(pkgParserPkg);
                return info[0].toCharsString();
            }


        }else {
            pkgParserCt = pkgParserCls.getConstructor(typeArgs);
            pkgParser = pkgParserCt.newInstance(apkPath);
            Method pkgParser_parsePackageMtd = pkgParserCls.getDeclaredMethod("parsePackage", File.class, String.class,DisplayMetrics.class,Integer.TYPE);
            Object pkgParserPkg = pkgParser_parsePackageMtd.invoke(pkgParser, new File(apkPath), apkPath,metrics,PackageManager.GET_SIGNATURES);
            Method pkgParser_collectCertificatesMtd = pkgParserCls.getDeclaredMethod("collectCertificates", pkgParserPkg.getClass(),Integer.TYPE);
            pkgParser_collectCertificatesMtd.invoke(pkgParser, pkgParserPkg,PackageManager.GET_SIGNATURES);
            // 应用程序信息包, 这个公开的, 不过有些函数, 变量没公开
            Field packageInfoFld = pkgParserPkg.getClass().getDeclaredField("mSignatures");
            Signature[] info = (Signature[]) packageInfoFld.get(pkgParserPkg);
            return info[0].toCharsString();
        }
    } catch (Exception e) {
        LogUtil.e("getAPKSignatures",e.getMessage());
        e.printStackTrace();
    }
    return null;
}