你可以从Java/Kotlin Activity中打印哈希键。部分代码已弃用，但这里是包含新旧代码的完整解决方案。

private fun printHashKey(context: Context) {
    try {

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
            val packageInfo: PackageInfo = context.packageManager.getPackageInfo(
                context.packageName,
                PackageManager.GET_SIGNING_CERTIFICATES
            )

            for (signature in packageInfo.signingInfo.apkContentsSigners) {
                val md = MessageDigest.getInstance("SHA")
                md.update(signature.toByteArray())
                Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT))
            }
        } else {
            val packageInfo: PackageInfo = context.packageManager.getPackageInfo(
                context.packageName,
                PackageManager.GET_SIGNATURES
            )

            for (signature in packageInfo.signatures) {
                val md = MessageDigest.getInstance("SHA")
                md.update(signature.toByteArray())
                Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT))
            }
        }

    } catch (e: PackageManager.NameNotFoundException) {
        Log.d(TAG, "printHashKey: PackageManager.NameNotFoundException -> $e")
    } catch (e: NoSuchAlgorithmException) {
        Log.d(TAG, "printHashKey: NoSuchAlgorithmException -> $e")
    }
}

在Android Studio中，只需点击右侧侧边栏面板“Gradle”即可显示gardel面板: -YOURAPPNAME ——任务 ——安卓 ----(双击)signingReport(启动Gradle Daemon)

然后你会看到结果:

Config: debug
Store: C:\Users\username\.android\debug.keystore
Alias: AndroidDebugKey
MD5: C8:46:01:EA:36:02:D1:21:1B:23:19:91:D4:32:CB:AC
SHA1: 38:AB:4C:01:01:D7:62:E0:61:D1:9F:52:04:0C:E5:07:4E:E4:9B:39
SHA-256: 1B:8C:DC:35:48:10:01:2C:1F:BD:01:64:F1:01:06:01:60:01:A6:8B:10:15:2E:BF:7B:C4:FD:38:4C:C1:74:01
Valid until: Saturday, February 12, 2050

SHA1副本:

38:AB:4C:01:01:D7:62:E0:68:D1:9F:52:04:0C:E5:07:4E:E4:9B:39

进入本页

粘贴SHA1并生成您的Facebook密钥哈希代码。

我只是为这个确切的目的做了一个工具，即https://keyhash.vaibhavpandey.com/。它比其他任何方法都简单，因为它需要您浏览计算机上的密钥存储库，并输入密码，分别为谷歌和Facebook生成SHA-1十六进制和Base64版本。

不必担心密钥库或密码短语，因为工作完全是在浏览器中完成的，您可以检查网络选项卡，该工具也是开源的https://github.com/vaibhavpandeyvpz/keyhash。

将此代码添加到您的活动的onCreate，它将在您的logCat的KeyHash标签下打印散列

try {
    PackageInfo info = getPackageManager().getPackageInfo(
                           getPackageName(),
                           PackageManager.GET_SIGNATURES);
    for (Signature signature : info.signatures) {
        MessageDigest md = MessageDigest.getInstance("SHA");
        md.update(signature.toByteArray());
        Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
    }
}
catch (NameNotFoundException e) {

}
catch (NoSuchAlgorithmException e) {

}

您可以为您的帐户添加多个hashkey，所以如果您一直在调试中运行，不要忘记在发布模式中再次运行此命令。

目前Facebook Android教程中的说明在Windows下并不适用。他们的例子展示了如何将keytool输出输出到openssl，但是如果你在Windows下尝试这样做，由于某些原因输出是无效的。我发现我必须使用中间文件才能让它正常工作。以下是对我有用的步骤:

首先从谷歌下载openssl for Windows。

C:\Users\Me>keytool -exportcert -alias my_key -keystore my.keystore -storepass PASSWORD > mycert.bin

C:\Users\Me>openssl sha1 -binary mycert.bin > sha1.bin

C:\Users\Me>openssl base64 -in sha1.bin -out base64.txt

运行这些命令后，有效的散列存储在文件base64.txt中。复制粘贴到你的Facebook应用设置中。

以下是步骤

Download openssl from Google code (If you have a 64 bit machine you must download openssl-0.9.8e X64 not the latest version) Extract it. create a folder- OpenSSL in C:/ and copy the extracted code here. detect debug.keystore file path. If u didn't find, then do a search in C:/ and use the Path in the command in next step. detect your keytool.exe path and go to that dir/ in command prompt and run this command in 1 line- $ keytool -exportcert -alias androiddebugkey -keystore "C:\Documents and Settings\Administrator.android\debug.keystore" | "C:\OpenSSL\bin\openssl" sha1 -binary |"C:\OpenSSL\bin\openssl" base64 it will ask for password, put android that's all. u will get a key-hash

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