[Android Studio] Google API

Google API

 

Google API는 구글 로그인 연동 기능을 제공하고 있다.

 

Google API 프로젝트 구성

 

 

인증 사이트에서 OAuth 2.0 웹 클라이언트 ID를 지정해야 한다. 실제 앱에서는 이 클라이언트 ID가 앱의 백엔드 서버를 나타낸다.

 

 

앱 등록 및 설정

 

 

Google API Console에 프로젝트를 만들고 SHA 인증서 지문을 등록하면 된다.

 

Gradle 서명 보고서

 

 

gradle task에서 gradle signingreport를 입력한다.

 

 

인증서 지문을 등록하면 구글 로그인을 위한 OAuth client가 구성된다.

 

build.gradle

 

dependencies {
	/* ... */
    implementation 'com.google.android.gms:play-services-auth:20.3.0'
	/* ... */
}

 

themes.xml

 

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
    </style>

    <!-- Activity with no Title -->
    <style name="ThemeOverlay.MyNoTitleActivity" parent="AppTheme">
        <item name="windowActionBar">false</item>
        <item name="windowNoTitle">true</item>
    </style>

    <!-- Dark Buttons -->
    <style name="ThemeOverlay.MyDarkButton" parent="ThemeOverlay.AppCompat.Dark">
        <item name="colorButtonNormal">@color/blue_grey_500</item>
        <item name="android:textColor">@android:color/white</item>
    </style>

</resources>

 

string.xml

 

<resources>
    <string name="app_name">Sign-In Quickstart</string>
    <string name="title_text">Google Sign-In\nQuickstart</string>

    <!-- Sign-in status messages -->
    <string name="signed_in_fmt">Signed in as: %s</string>
    <string name="signed_in">Signed in</string>
    <string name="signing_in">Signing in…</string>
    <string name="signed_out">Signed out</string>
    <string name="signed_in_err">"Error: please check logs."</string>
    <string name="error_null_person">
        Error: Plus.PeopleApi.getCurrentPerson returned null. Ensure that the Google+ API is
        enabled for your project, you have a properly configured google-services.json file
        and that your device has an internet connection.
    </string>
    <string name="loading">Loading…</string>
    <string name="auth_code_fmt">Auth Code: %s</string>
    <string name="id_token_fmt">ID Token: %s</string>

    <!-- Google Play Services error for Toast -->
    <string name="play_services_error_fmt">Google Play Services Error: %i</string>

    <!-- Button labels -->
    <string name="sign_out">Sign Out</string>
    <string name="disconnect">Disconnect</string>
    <string name="refresh_token">Get Fresh Token</string>

    <!-- Content Description for images -->
    <string name="desc_google_icon">Google Logo</string>

    <!-- Rationale for asking for Contacts -->
    <string name="contacts_permission_rationale">Contacts access is needed in order to retrieve your email address.</string>

    <!-- Activity Names and Descriptions -->
    <string name="name_sign_in_activity">SignInActivity</string>
    <string name="desc_sign_in_activity">Signing in, signing out, and revoking access.</string>
    <string name="desc_sign_in_activity_scopes">Signing in, signing out, and revoking access with Google Drive permissions.</string>

    <string name="name_id_token_activity">IdTokenActivity</string>
    <string name="desc_id_token_activity">Retrieving an ID Token for the user.</string>

    <string name="desc_auth_code_activity">Demonstrate retrieving an auth code for authorizing your server.</string>
    <string name="name_auth_code_activity">ServerAuthCodeActivity</string>

    <string name="desc_rest_activity">Demonstrate using Google Sign In with a Google REST API</string>
    <string name="name_rest_activity">RestApiActivity</string>

    <!-- Messages for the Rest API activity -->
    <string name="connections_fmt">Connections: %1$s</string>
    <string name="msg_contacts_failed">Get contacts failed.</string>

    <!-- TODO(user): replace with your real server client ID -->
    <!-- Server Client ID.  This should be a valid Web OAuth 2.0 Client ID obtained
         from https://console.developers.google.com/ -->
    <string name="server_client_id">YOUR_SERVER_CLIENT_ID</string>
</resources>

 

colors.xml

 

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="blue_grey_500">#607D8B</color>
    <color name="blue_grey_600">#546E7A</color>
    <color name="blue_grey_700">#455A64</color>
    <color name="blue_grey_800">#37474F</color>
    <color name="blue_grey_900">#263238</color>
</resources>

 

activity_main.xml

 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/blue_grey_700"
    android:orientation="vertical"
    android:weightSum="4"
    tools:context=".SignInActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="3"
        android:gravity="center_horizontal"
        android:orientation="vertical">

        <ImageView
            android:id="@+id/google_icon"
            android:layout_width="48dp"
            android:layout_height="48dp"
            android:layout_marginBottom="10dp"
            android:layout_marginTop="@dimen/g_top_margin"
            android:contentDescription="@string/desc_google_icon"
            android:src="@drawable/googleg_color" />

        <TextView
            android:id="@+id/title_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:text="@string/title_text"
            android:gravity="center"
            android:textColor="@android:color/white"
            android:textSize="36sp" />

        <TextView
            android:id="@+id/status"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/signed_out"
            android:textColor="@android:color/white"
            android:textSize="14sp" />

        <TextView
            android:id="@+id/detail"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:fadeScrollbars="true"
            android:gravity="center"
            android:maxLines="5"
            android:padding="10dp"
            android:scrollbars="vertical"
            android:textColor="@android:color/white"
            android:textSize="14sp" />

        <Button
            android:id="@+id/button_optional_action"
            style="@style/Base.Widget.AppCompat.Button.Borderless.Colored"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:visibility="gone"
            tools:text="Optional Action"
            tools:visibility="visible" />

    </LinearLayout>


    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:background="@color/blue_grey_900">

        <com.google.android.gms.common.SignInButton
            android:id="@+id/sign_in_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:visibility="visible"
            tools:visibility="gone" />

        <LinearLayout
            android:id="@+id/sign_out_and_disconnect"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:orientation="horizontal"
            android:paddingLeft="16dp"
            android:paddingRight="16dp"
            android:visibility="gone"
            tools:visibility="visible">

            <Button
                android:id="@+id/sign_out_button"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="@string/sign_out"
                android:theme="@style/ThemeOverlay.MyDarkButton" />

            <Button
                android:id="@+id/disconnect_button"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="@string/disconnect"
                android:theme="@style/ThemeOverlay.MyDarkButton" />
        </LinearLayout>

    </RelativeLayout>

</LinearLayout>

 

java

 

import android.content.Intent;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.TextView;

import com.google.android.gms.auth.api.signin.GoogleSignIn;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInClient;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.common.api.ApiException;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;

/**
 * Activity to demonstrate basic retrieval of the Google user's ID, email address, and basic
 * profile.
 */
public class SignInActivity extends AppCompatActivity implements
        View.OnClickListener {

    private static final String TAG = "SignInActivity";
    private static final int RC_SIGN_IN = 9001;

    private GoogleSignInClient mGoogleSignInClient;
    private TextView mStatusTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Views
        mStatusTextView = findViewById(R.id.status);

        // Button listeners
        findViewById(R.id.sign_in_button).setOnClickListener(this);
        findViewById(R.id.sign_out_button).setOnClickListener(this);
        findViewById(R.id.disconnect_button).setOnClickListener(this);

        // [START configure_signin]
        // Configure sign-in to request the user's ID, email address, and basic
        // profile. ID and basic profile are included in DEFAULT_SIGN_IN.
        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestEmail()
                .build();
        // [END configure_signin]

        // [START build_client]
        // Build a GoogleSignInClient with the options specified by gso.
        mGoogleSignInClient = GoogleSignIn.getClient(this, gso);
        // [END build_client]

        // [START customize_button]
        // Set the dimensions of the sign-in button.
        SignInButton signInButton = findViewById(R.id.sign_in_button);
        signInButton.setSize(SignInButton.SIZE_STANDARD);
        signInButton.setColorScheme(SignInButton.COLOR_LIGHT);
        // [END customize_button]
    }

    @Override
    public void onStart() {
        super.onStart();

        // [START on_start_sign_in]
        // Check for existing Google Sign In account, if the user is already signed in
        // the GoogleSignInAccount will be non-null.
        GoogleSignInAccount account = GoogleSignIn.getLastSignedInAccount(this);
        updateUI(account);
        // [END on_start_sign_in]
    }

    // [START onActivityResult]
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        // Result returned from launching the Intent from GoogleSignInClient.getSignInIntent(...);
        if (requestCode == RC_SIGN_IN) {
            // The Task returned from this call is always completed, no need to attach
            // a listener.
            Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
            handleSignInResult(task);
        }
    }
    // [END onActivityResult]

    // [START handleSignInResult]
    private void handleSignInResult(Task<GoogleSignInAccount> completedTask) {
        try {
            GoogleSignInAccount account = completedTask.getResult(ApiException.class);

            // Signed in successfully, show authenticated UI.
            updateUI(account);
        } catch (ApiException e) {
            // The ApiException status code indicates the detailed failure reason.
            // Please refer to the GoogleSignInStatusCodes class reference for more information.
            Log.w(TAG, "signInResult:failed code=" + e.getStatusCode());
            updateUI(null);
        }
    }
    // [END handleSignInResult]

    // [START signIn]
    private void signIn() {
        Intent signInIntent = mGoogleSignInClient.getSignInIntent();
        startActivityForResult(signInIntent, RC_SIGN_IN);
    }
    // [END signIn]

    // [START signOut]
    private void signOut() {
        mGoogleSignInClient.signOut()
                .addOnCompleteListener(this, new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                        // [START_EXCLUDE]
                        updateUI(null);
                        // [END_EXCLUDE]
                    }
                });
    }
    // [END signOut]

    // [START revokeAccess]
    private void revokeAccess() {
        mGoogleSignInClient.revokeAccess()
                .addOnCompleteListener(this, new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                        // [START_EXCLUDE]
                        updateUI(null);
                        // [END_EXCLUDE]
                    }
                });
    }
    // [END revokeAccess]

    private void updateUI(@Nullable GoogleSignInAccount account) {
        if (account != null) {
            mStatusTextView.setText(getString(R.string.signed_in_fmt, account.getDisplayName()));

            findViewById(R.id.sign_in_button).setVisibility(View.GONE);
            findViewById(R.id.sign_out_and_disconnect).setVisibility(View.VISIBLE);
        } else {
            mStatusTextView.setText(R.string.signed_out);

            findViewById(R.id.sign_in_button).setVisibility(View.VISIBLE);
            findViewById(R.id.sign_out_and_disconnect).setVisibility(View.GONE);
        }
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.sign_in_button:
                signIn();
                break;
            case R.id.sign_out_button:
                signOut();
                break;
            case R.id.disconnect_button:
                revokeAccess();
                break;
        }
    }
 }

 

https://github.com/googlesamples/google-services

GitHub - googlesamples/google-services: A collection of quickstart samples demonstrating the Google APIs for Android and iOS