NeoVe NeoVe - 3 months ago 63
Android Question

Custom Facebook Login Button - Android

I''m following this Tutorial but so far I can't make it work, though this is from a year ago or so...

I'm using androidStudo 1.2.2 and FacebookSDK 4.

I want a simple login into facebook using a custom button, like the one shown in this image:

Example

Now, in the example from the tutorial I'm having problems with the

Session
variable, it says it cannot resolve it, neither
getActivity()


Has naybody tried this on FacebookSDK4.0?

Is that a correct approach or maybe there is something more updated?

Thanks in advance!

Answer

Step 1: First add FrameLayout and make facebook button visibility="gone" and add your custom button. Don't forgot to put xmlns:facebook="http://schemas.android.com/apk/res-auto" in your main layout.

<FrameLayout
        android:id="@+id/FrameLayout1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <com.facebook.login.widget.LoginButton
            android:id="@+id/login_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:visibility="gone" />

        <Button
            android:id="@+id/fb"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="#416BC1"
            android:onClick="onClick"
            android:text="FaceBook"
            android:textColor="#ffffff"
            android:textStyle="bold" />
    </FrameLayout>

Step 2: Initialize FacebookSdk in onCreate before inflecting layout.

FacebookSdk.sdkInitialize(this.getApplicationContext());

Step 3: add this into your java file.

callbackManager = CallbackManager.Factory.create();

fb = (Button) findViewById(R.id.fb);
loginButton = (LoginButton) findViewById(R.id.login_button);

List < String > permissionNeeds = Arrays.asList("user_photos", "email",
    "user_birthday", "public_profile", "AccessToken");
loginButton.registerCallback(callbackManager,
new FacebookCallback < LoginResult > () {@Override
    public void onSuccess(LoginResult loginResult) {

        System.out.println("onSuccess");

        String accessToken = loginResult.getAccessToken()
            .getToken();
        Log.i("accessToken", accessToken);

        GraphRequest request = GraphRequest.newMeRequest(
        loginResult.getAccessToken(),
        new GraphRequest.GraphJSONObjectCallback() {@Override
            public void onCompleted(JSONObject object,
            GraphResponse response) {

                Log.i("LoginActivity",
                response.toString());
                try {
                    id = object.getString("id");
                    try {
                        URL profile_pic = new URL(
                            "http://graph.facebook.com/" + id + "/picture?type=large");
                        Log.i("profile_pic",
                        profile_pic + "");

                    } catch (MalformedURLException e) {
                        e.printStackTrace();
                    }
                    name = object.getString("name");
                    email = object.getString("email");
                    gender = object.getString("gender");
                    birthday = object.getString("birthday");
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        });
        Bundle parameters = new Bundle();
        parameters.putString("fields",
            "id,name,email,gender, birthday");
        request.setParameters(parameters);
        request.executeAsync();
    }

    @Override
    public void onCancel() {
        System.out.println("onCancel");
    }

    @Override
    public void onError(FacebookException exception) {
        System.out.println("onError");
        Log.v("LoginActivity", exception.getCause().toString());
    }
});

Step 4: Don't forget to add following code.

@Override
protected void onActivityResult(int requestCode, int responseCode,
Intent data) {
    super.onActivityResult(requestCode, responseCode, data);
    callbackManager.onActivityResult(requestCode, responseCode, data);
}

Step 5: Set your custom button click to FacebookLogin button click.

public void onClick(View v) {
    if (v == fb) {
        loginButton.performClick();
    }
 }

Step 6: For programmatically logout use this.

LoginManager.getInstance().logOut();

Step 7: you can find user logged in or not by profile.

profile = Profile.getCurrentProfile().getCurrentProfile();
if (profile != null) {
    // user has logged in
} else {
    // user has not logged in
}