android获取签名，兼容5.0

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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