为了在你的本地计算机上生成你的密钥散列，运行Java的keytool实用程序(它应该在你的控制台路径上)针对Android调试密钥存储库。默认情况下，在你的home .android目录下)。在OS X上运行:

keytool -exportcert -alias androiddebugkey -keystore ~/.android/debug.keystore | openssl sha1 -binary | openssl base64

Windows操作系统使用:-

keytool -exportcert -alias androiddebugkey -keystore %HOMEPATH%\.android\debug.keystore | openssl sha1 -binary | openssl base64

希望这对你有所帮助

参考开发者facebook网站

也有一个简单的解决方案。在你的应用中运行这个:

FacebookSdk.sdkInitialize(getApplicationContext());
Log.d("AppLog", "key:" + FacebookSdk.getApplicationSignature(this));

一个不需要FB SDK(基于这里的解决方案)的较长的例子:

public static void printHashKey(Context context) {
    try {
        final PackageInfo info = context.getPackageManager().getPackageInfo(context.getPackageName(), PackageManager.GET_SIGNATURES);
        for (android.content.pm.Signature signature : info.signatures) {
            final MessageDigest md = MessageDigest.getInstance("SHA");
            md.update(signature.toByteArray());
            final String hashKey = new String(Base64.encode(md.digest(), 0));
            Log.i("AppLog", "key:" + hashKey + "=");
        }
    } catch (Exception e) {
        Log.e("AppLog", "error:", e);
    }
}

结果应该以“=”结尾。

this will help newbees also. just adding more details to @coder_For_Life22's answer. if this answer helps you don't forget to upvote. it motivates us. for this you must already know the path of the app's keystore file and password for this example consider the key is stored at "c:\keystorekey\new.jks" 1. open this page https://code.google.com/archive/p/openssl-for-windows/downloads 2. download 32 or 64 bit zip file as per your windows OS. 3. extract the downloaded file where ever you want and remember the path. 4. for this example we consider that you have extracted the folder in download folder. so the file address will be "C:\Users\0\Downloads\openssl-0.9.8e_X64\bin\openssl.exe"; 5. now on keyboard press windows+r button. 6. this will open run box. 7. type cmd and press Ctrl+Shift+Enter. 8. this will open command prompt as administrator. 9. here navigate to java's bin folder: if you use jre provided by Android Studio you will find the path as follows: a. open android studio. b. file->project structure c. in the left pane, click 'SDK location' d. in the right pane, below 'JDK location' is your jre path. e. add "\bin" at the end of this path as the file "keytool.exe", we need, is inside this folder. for this example i consider, you have installed java separately and following is the path "C:\Program Files\Java\jre-10.0.2\bin" if you have installed 32bit java it will be in "C:\Program Files (x86)\Java\jre-10.0.2\bin" 10. now with above paths execute command as following:

keytool -exportcert -alias androiddebugkey -keystore "c:\keystorekey\new.jks" | "C:\Users\0\Downloads\openssl-0.9.8e_X64\bin\openssl.exe" sha1 -binary |"C:\Users\0\Downloads\openssl-0.9.8e_X64\bin\openssl.exe" base64

您将被要求输入密码，请输入您在创建密钥存储库密钥时所提供的密码。 ! ! 这将给你钥匙

错误: 如果你得到: --- 'keytool'不能被识别为内部或外部命令 --- 这意味着Java安装在其他地方。

下载open ssl:

然后将openssl\bin添加到路径系统变量中:

我的电脑->属性->高级配置->高级->系统变量->系统变量下查找路径，并将此添加到其结尾: ; yourFullOpenSSLDir \ bin

现在在你的jdk\bin文件夹C:\Program Files\Java\ jdk1.8.0_40\bin上打开一个命令行(在windows上按住shift并右键单击->打开命令行此处)，并使用:

keytool -exportcert -alias keystorealias -keystore C:\yourkeystore\folder\keystore.jks | openssl sha1 -binary | openssl base64

并复制它在给出密码后生成的长度为28的数字。

不安装openssl ->使用GIT BASH!

Keytool -exportcert -alias androiddebugkey -keystore ~/.android/debug。Keystore | openssl sha1 -binary | openssl base64 . Keystore | openssl sha1 -binary

默认密码为“android”

我们大多数人都安装了Git Bash，所以这是我最喜欢的方式。

你可以用这个apk

1.first install the app from the Google play store
2.install the above apk
3.launch the apk and input the package name of your app
4.then you will get the hash code you want