Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * MIT License
 *
 * Copyright (c) 2016 Aldrin Clemente
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

import android.content.Context;

import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.Signature;

import android.util.Base64;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.List;

public class Main {
    /**
     * Returns the key hashes of the signatures of the app with the specified package name
     * which may be needed when integrating with 3rd party services such as Facebook. Note that
     * Android apps usually only have one signature.
     *
     * @param context
     * @param packageName The package name of the app
     * @return The key hashes
     */
    public static List<String> getKeyHashes(Context context, String packageName) {
        try {
            List<String> hashes = new ArrayList<>();
            PackageInfo info = context.getPackageManager().getPackageInfo(packageName,
                    PackageManager.GET_SIGNATURES);
            for (Signature signature : info.signatures) {
                MessageDigest md = MessageDigest.getInstance("SHA");
                md.update(signature.toByteArray());
                hashes.add(Base64.encodeToString(md.digest(), Base64.DEFAULT));
            }
            return hashes;
        } catch (PackageManager.NameNotFoundException e) {
        } catch (NoSuchAlgorithmException e) {
        }
        return null;
    }

    /**
     * Returns the key hashes of the signatures of the calling app which may be needed when
     * integrating with 3rd party services such as Facebook. Note that Android apps usually only
     * have one signature.
     *
     * @param context
     * @return The key hashes
     */
    public static List<String> getKeyHashes(Context context) {
        return getKeyHashes(context, context.getPackageName());
    }
}