Facebook API Question posted in
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Android Facebook Login API going directly to onCancel() when Facebook App is installed – Facebook api

So I’ve implemented Facebook Login in my Android app for a while now, and it’s been working fine for months.

The problems began when I updated the SDK version to one of the latest (4.22.0). After this point, clicking the Facebook Login button just causes a brief attempt at logging in and then nothing. From the log I can see onCancel() in the FacebookCallback is being called but that’s it.

Everything works fine when I uninstall the Facebook app. I go through the web view login and then I’m able to proceed (onSuccess() is called).

I’ve tried reverting back to the SDK version I was using earlier, but no luck. I’ve checked that my KeyHashes match (both debug and release) what’s on the Facebook Developer Dashboard, and it does. My App ID matches too.’

I know that I’m logged out prior to attempting a login since I’m forcing a logout with LoginManager.

It’s very odd. I used the following code to generate my KeyHash:

try {
            PackageInfo info = getPackageManager().getPackageInfo(
                    "***.*****.************",
                    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 (PackageManager.NameNotFoundException e) {

        } catch (NoSuchAlgorithmException e) {

        }
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3

Answers


  1. 0

    You need to have a signed aPK KeyHash so, make signed APk and that signed APK run in your device and get signed keyHash from debug log.that key hash update into your facebook developer console.

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  2. 0

    Try to using that code for fackbook hash key generation.

     try {
            PackageInfo info = getPackageManager().getPackageInfo("enter your package", 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 (PackageManager.NameNotFoundException e) {

        } catch (NoSuchAlgorithmException e) {

        }
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  3. 0

    I used following steps to generate a Key Hash for my app in facebook:

    1. First open a terminal in mac (open a command prompt in windows).

    2. Navigate in the terminal to the directory where your Android debug.keystore is stored. Mostly in Windows it will located under “/Users/user_name/.android/” and in Windows will be C:Documents and Settings.android).

    3. In mac – Type cd ~/.android and hit enter to go to .android directory

    4. Once you are in the “.android” directory, run the following command to get a debug key..
      keytool -exportcert -alias androiddebugkey -keystore debug.keystore | openssl sha1 -binary | openssl base64

    5. Use the same procedure to get the Release key. Just replace the command with the following and use your release key alias.
      keytool -exportcert -alias YOUR_RELEASE_KEY_ALIAS -keystore YOUR_RELEASE_KEY_PATH | “PATH FOR openssl.exe” sha1 -binary | openssl base64

    6. When it prompts you for a password, type android and hit Enter

    7. Copy the value printed in the terminal that ends with an “=” and paste it in the Key Hash field in Facebook. Then click the Save Changes button.

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