Java tutorial
//package com.java2s; //License from project: Apache License import android.content.Context; import android.content.pm.PackageInfo; import android.content.pm.PackageManager; public class Main { public static byte[] getApkSign(Context context, String packageName) { byte[] arrayOfByte = null; try { PackageInfo localPackageInfo = context.getPackageManager().getPackageInfo(packageName, PackageManager.GET_SIGNATURES); arrayOfByte = localPackageInfo.signatures[0].toByteArray(); } catch (PackageManager.NameNotFoundException localNameNotFoundException) { localNameNotFoundException.printStackTrace(); } return arrayOfByte; } }