android获取签名，兼容5.0

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废话不说，直接贴代码。
public static String getApkSignatureMD5(Context context, String apkPath) throws Exception {String sign = null;Class clazz = Class.forName("android.content.pm.PackageParser");Object packageParser = getParserObject(clazz);Object packag = getPackage(context, clazz, packageParser, apkPath);Method collectCertificatesMethod = clazz.getMethod("collectCertificates", Class.forName("android.content.pm.PackageParser$Package"), int.class);collectCertificatesMethod.invoke(packageParser, packag, PackageManager.GET_SIGNATURES);Signature mSignatures[] = (Signature[]) packag.getClass().getField("mSignatures").get(packag);System.out.println("size:" + mSignatures.length);Signature apkSignature = mSignatures.length > 0 ? mSignatures[0] : null;if (apkSignature != null) {sign = StringUtils.md5(apkSignature.toByteArray());}System.out.println("sign:" + sign);return sign;}private static Object getParserObject(Class clazz) throws InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException {return Build.VERSION.SDK_INT >= 21 ?clazz.getConstructor().newInstance() : clazz.getConstructor(String.class).newInstance("");}private static Object getPackage(Context c, Class clazz, Object instance, String path) throws Exception {Object pkg = null;if (Build.VERSION.SDK_INT >= 21) {Method method = clazz.getMethod("parsePackage", File.class, int.class);pkg = method.invoke(instance, new File(path) ,0x0004);} else {Method method = clazz.getMethod("parsePackage", File.class, String.class, DisplayMetrics.class, int.class);pkg = method.invoke(instance, new File(path), null, c.getResources().getDisplayMetrics(), 0x0004);}return pkg;}
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