Sample Scribe OAuth2 for Frappe Server

activity_login.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.mntechnique.oauth2authenticator.LoginActivity">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/login"
        android:text="Login"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

FrappeApi.java

package com.mntechnique.oauth2authenticator.utils;

import com.github.scribejava.core.builder.api.DefaultApi20;
import com.github.scribejava.core.exceptions.OAuthException;
import com.github.scribejava.core.extractors.TokenExtractor;
import com.github.scribejava.core.model.OAuth2AccessToken;
import com.github.scribejava.core.model.Response;
import com.github.scribejava.core.model.Verb;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.IOException;

/**
 * Created by revant on 11/7/17.
 */

public class FrappeApi extends DefaultApi20 {

    protected FrappeApi() {
    }

    private static class InstanceHolder {
        private static final FrappeApi INSTANCE = new FrappeApi();
    }

    public static FrappeApi instance() {
        return InstanceHolder.INSTANCE;
    }

    @Override
    public Verb getAccessTokenVerb() {
        return Verb.POST;
    }

    @Override
    public String getAccessTokenEndpoint() {
        return "https://erp.mntechnique.com/api/method/frappe.integrations.oauth2.get_token";
    }

    @Override
    protected String getAuthorizationBaseUrl() {
        return "https://erp.mntechnique.com/api/method/frappe.integrations.oauth2.authorize";
    }

    @Override
    public TokenExtractor<OAuth2AccessToken> getAccessTokenExtractor() {
        //return OAuth2AccessTokenExtractor.instance();
        return new TokenExtractor<OAuth2AccessToken>() {

            @Override
            public OAuth2AccessToken extract(Response response) throws IOException, OAuthException {
                String token = null;
                try {
                    JSONObject bearerToken = new JSONObject(response.getBody());
                    token = bearerToken.getString("access_token");
                } catch (JSONException e) {
                    e.printStackTrace();
                }
                return new OAuth2AccessToken(token);
            }
        };
    }
}

FrappeClient.java

package com.mntechnique.oauth2authenticator.utils;

import android.content.Context;

import com.codepath.oauth.OAuthBaseClient;
import com.github.scribejava.core.builder.api.BaseApi;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.RequestParams;

/**
 * Created by revant on 11/7/17.
 */
public class FrappeClient extends OAuthBaseClient {
    public static final BaseApi REST_API_INSTANCE = FrappeApi.instance();
    public static final String REST_URL = "https://erp.mntechnique.com/api";
    public static final String REST_CONSUMER_KEY = "a0544d8eee";
    public static final String REST_CONSUMER_SECRET = "247e2e069c";
    public static final String REST_CALLBACK_URL = "oauth2://frappeclient";

    public FrappeClient(Context context) {
        super(context, REST_API_INSTANCE, REST_URL,
                REST_CONSUMER_KEY, REST_CONSUMER_SECRET, REST_CALLBACK_URL);
    }

    // ENDPOINTS BELOW

    public void getHomeTimeline(int page, AsyncHttpResponseHandler handler) {
        String apiUrl = getApiUrl("method/frappe.integrations.oauth2.openid_profile");
        RequestParams params = new RequestParams();
        params.put("page", String.valueOf(page));
        client.get(apiUrl, params, handler);
    }
}

LoginActivity.java

package com.mntechnique.oauth2authenticator;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.codepath.oauth.OAuthLoginActivity;
import com.mntechnique.oauth2authenticator.utils.FrappeClient;

public class LoginActivity extends OAuthLoginActivity<FrappeClient> {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        Button login = (Button) findViewById(R.id.login);
        login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                getClient().connect();
            }
        });
    }

    @Override
    public void onLoginSuccess() {
        Toast.makeText(getBaseContext(), "Logged In!", Toast.LENGTH_LONG).show();
    }

    // Fires if the authentication process fails for any reason.
    @Override
    public void onLoginFailure(Exception e) {
        Toast.makeText(getBaseContext(), "ERROR", Toast.LENGTH_LONG).show();
        e.printStackTrace();
    }
}