Use Facebook credentials to log my application

问题:

I want to add log in with Facebook button to my application. So i tried to follow this guide.

Getting Started with the Facebook SDK for Android

I tried to get Android key hash. But i couldn't to run it on my PC cmd.

This is code i tried.

i added my home path to this %HOMEPATH%.

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

But it shows like this error.

Can anyone help me to fix this error.

回答1:

Firstly download openssl from this a link

Second extract it to Local disk C: name it openssl i.e folder name

third set it in Environment variables. procedure as follows

right click on My computer->properties->advanced->environment variables under system variables->click on path and click edit

Now insert a ';' semi-colon and paste the path of folder openssl. then ok.

now u can see openssl is recognized as command in cmd.

to get KeyHash execute follwing cmd

keytool -exportcert -alias androiddebugkey -keystore "path of ur debug.keystore" | "C:\openssl\bin\openssl.exe" sha1 -binary | "C:\openssl\bin\openssl.exe" base64

Solution for the warning---

WARNING: can't open config file: C:/OpenSSL/openssl.cnf
WARNING: can't open config file: C:/OpenSSL/openssl.cnf
openssl:Error: 'base' is an invalid command.

1st add below line in environment variable as similar to third step.

set OPENSSL_CONF=c:\openssl\bin\openssl.cfg

now run above cmd

keytool -exportcert -alias androiddebugkey -keystore "path of ur debug.keystore" | "C:\openssl\bin\openssl.exe" sha1 -binary | "C:\openssl\bin\openssl.exe" base64

u do get warning but keyHash is returned in cmd...

回答2:

Use following code to print hash key in your log

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        PrintHashKeyInLog();

    }

    public void PrintHashKeyInLog() {

        PackageInfo info;
        try {
            info = getPackageManager().getPackageInfo(
                    "Your package name",
                    PackageManager.GET_SIGNATURES);
            for (Signature signature : info.signatures) {
                MessageDigest md;
                md = MessageDigest.getInstance("SHA");
                md.update(signature.toByteArray());
                String something = new String(Base64.encode(md.digest(), 0)); // String
                something = new String(Base64.encode(md.digest(), 0));
                Log.e("hash key", something);
            }
        } catch (NameNotFoundException e1) {
            Log.e("name not found", e1.toString());
        } catch (NoSuchAlgorithmException e) {
            Log.e("no such an algorithm", e.toString());
        } catch (Exception e) {
            Log.e("exception", e.toString());
        }
    }