本文详细介绍如何在Android应用中集成Google登录功能，包括配置项目、添加依赖、实现登录流程等关键步骤。
一、打开主界面：
https://developers.google.com/
二、点击最右侧的所有产品
https://developers.google.com/products/
三、点击登陆和身份识别，然后选择Google Sign-In
四、选择ANDROID
五、点击GET STARTED
六、点击ADD SIGN-IN TO YOUR APP
七、将谷歌登陆集成到Android应用
将谷歌登陆集成到你的Android应用
在你将谷歌登陆集成到你的app中之前，你必须在谷歌控API的控制台对该项目进行配置。接下来描述如何将谷歌登陆集成到你的app。
前期准备
-2.3或之上，并且包含Google Play Store的手机,或者Android4.2.2或者更高的Google APIS平台的系统并且有9.8.0或之上的谷歌服务。
-最新的Android SDK版本，包括SDK工具组件。可以通过Android Studio中的Android SDK Manager来进行下载。
-项目的编译版本在2.3或以上
-谷歌服务的SDK:
1.在Android Studio中，选择Tools>Android>SDK Manager
2.滑动到选项列表的底部，并选择Extras>Google Repository。软件包将会被下载到你的电脑，并且在SDK的配置目录下进行安装android-sdk-folder/extras/google/google_play_services
本文是推荐的开发工具Android Studio的开发指南
获取配置文件
点击下面的按钮来获取配置文件并添加到你的项目中。
配置文件为app提供了特殊的服务。在获取之前，你必须选择一个已经存在的项目或者重新创建一个。你还必须为你的app提供包名。
在创建配置文件的时候，你也必须提供签名证书的SHA-1.查看 Authenticating Your Client（https://developers.google.com/android/guides/client-auth） 获取更多的信息。
添加谷歌服务插件
Gradle的谷歌服务插件用来解析google-services.json中的配置信息。通过在project级的build.gradle中进行配置并且app级的build.gradle文件如下：
1.在project级的build.gradle中添加以下依赖：
classpath 'com.google.gms:google-services:3.0.0'
2.在app级的build.gradle中添加如下文件：
在app级的build.gradle文件中，声明Google Play Services的依赖：
apply plugin: 'com.android.application'
...
dependencies {
compile 'com.google.android.gms:play-services-auth:9.8.0'
}apply plugin: 'com.google.gms.google-services'
获取服务端的OAuth 2.0的客户端ID
1.打开凭证界面（https://console.developers.google.com/apis/credentials?project=test-analytics-f14b6）
2.网页应用类型的客户端ID是你的OAuth2.0客户端ID
注：如果你没有创建新的Android客户端，你可能没有网络应用类型的客户端ID.你可以在凭证界面点击创建凭证-->OAuth客户端ID来进行创建
当创建GoogleSignInOptions对象时，传入到方法requestIdToken或requestServerAuthCode.
配置谷歌登陆和谷歌客户端请求对象
1.在Activity的onCrete方法中，配置谷歌登陆所需的用户请求。例如，配置谷歌登陆请求的客户ID和基本的文件信息，创建一个默认参数的GoogleSignInOptions对象。用GoogleSignInOptions对象来配置用的邮件地址。
// 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();注：为了使用enableAutoManage,必须继承Android Support Library下的FragmentActivity或者AppCompatActivity(FragmentActivity的子类)。你可以在Fragment中使用GgoogleApiClient；然而，该fragment的父Activity必须是FragmentActivity.如果你不能继承FragmentActivity，你必须手动管理GoogleApiClient连接的生命周期。
2.在Activityd onCreate方法中，创建要给GoogleApiClient对象来访问Google Sign-In AP和其它定义的信息。
// Build a GoogleApiClient with access to the Google Sign-In API and the
// options specified by gso.
mGoogleApiClient = new GoogleApiClient.Builder(this)
.enableAutoManage(this /* FragmentActivity */, this /* OnConnectionFailedListener */)
.addApi(Auth.GOOGLE_SIGN_IN_API, gso)
.build();
注：为了自动化管理，activity必须继承Android Support Library包下的FragmentActivity或者AppCompatActivity(FragmentActivity的子类)。你也可以在Fragment中使用GoogleApiClient,然后，该fragment的父activity必须是FragmentActivity.如果不继承FragmentActivity,那么你必须手动管理GoogleApiClient连接的生命周期。
添加谷歌登陆按钮
1.在应用布局中添加登陆按钮
<com.google.android.gms.common.SignInButton
android:id="@+id/sign_in_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />// Set the dimensions of the sign-in button.3.在Activity的onCreate方法中，注册当用户点击时登陆的按钮的点击事件：
SignInButton signInButton = (SignInButton) findViewById(R.id.sign_in_button);
signInButton.setSize(SignInButton.SIZE_STANDARD);
findViewById(R.id.sign_in_button).setOnClickListener(this);开始登陆
1.在Activity的onClick方法中，通过getSingnInIntent方法来创建一个登陆的intent来处理点击，并且通过startActivityForResult来开启intent
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.sign_in_button:
signIn();
break;
// ...
}
}private void signIn() {
Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
startActivityForResult(signInIntent, RC_SIGN_IN);
}弹出提示框让用户选择一个所要登陆的账户。
2.在方法onActivityResult中从getSignInResultFromIntent中检索登陆的结果信息
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
if (requestCode == RC_SIGN_IN) {
GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
handleSignInResult(result);
}
}在获取到登陆的结果后，可以通过方法isSuccess来检测是否登陆成功。如果登陆成功，你可以调用方法getSignInAccount来获取登陆用户信息的GoogleSignInAccount对象，例如用户名。
private void handleSignInResult(GoogleSignInResult result) {
Log.d(TAG, "handleSignInResult:" + result.isSuccess());
if (result.isSuccess()) {
// Signed in successfully, show authenticated UI.
GoogleSignInAccount acct = result.getSignInAccount();
mStatusTextView.setText(getString(R.string.signed_in_fmt, acct.getDisplayName()));
updateUI(true);
} else {
// Signed out, show unauthenticated UI.
updateUI(false);
}
}package com.gp.download.apk;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.FragmentActivity;
import android.view.View;
import com.google.android.gms.auth.api.Auth;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.auth.api.signin.GoogleSignInResult;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.SignInButton;
public class MainActivity extends FragmentActivity implements GoogleApiClient.OnConnectionFailedListener, View.OnClickListener {
private Context context;
private String dirPath;
private GoogleApiClient mGoogleApiClient;
private SignInButton SignInButton;
private int RC_SIGN_IN = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = getApplicationContext();
dirPath = context.getFilesDir().toString();
findViewById();
initData();
setOnClickListener();
}
private void setOnClickListener() {
SignInButton.setOnClickListener(this);
}
private void findViewById() {
SignInButton = (com.google.android.gms.common.SignInButton) findViewById(R.id.sign_in_button);
}
private void initData() {
// 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();
// Build a GoogleApiClient with access to the Google Sign-In API and the
// options specified by gso.
mGoogleApiClient = new GoogleApiClient.Builder(this)
.enableAutoManage(this /* FragmentActivity */
, this /* OnConnectionFailedListener */)
.addApi(Auth.GOOGLE_SIGN_IN_API, gso)
.build();
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
@Override
public void onClick(View view) {
System.out.println("click 1....................");
switch (view.getId()) {
case R.id.sign_in_button:
System.out.println("click 2....................");
signIn();
break;
}
}
private void signIn() {
System.out.println("click 3....................");
Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
startActivityForResult(signInIntent, RC_SIGN_IN);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
System.out.println("click 4....................");
// Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
if (requestCode == RC_SIGN_IN) {
System.out.println("click 5....................");
GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
handleSignInResult(result);
}
}
private void handleSignInResult(GoogleSignInResult result) {
System.out.println("handleSignInResult:" + result.isSuccess());
if (result.isSuccess()) {
// Signed in successfully, show authenticated UI.
GoogleSignInAccount acct = result.getSignInAccount();
// mStatusTextView.setText(getString(R.string.signed_in_fmt, acct.getDisplayName()));
// updateUI(true);
System.out.println("login succeed........................" + acct.getIdToken());
} else {
// Signed out, show unauthenticated UI.
// updateUI(false);
System.out.println("login failed........................");
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.gp.download.apk.MainActivity">
<com.google.android.gms.common.SignInButton
android:id="@+id/sign_in_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
注：
1、出现异常：Failed to resolve: com.google.firebase:firebase-core:9.0.0
解决方法：
点击Tools>Android>SDK Manager>Launch Standalone SDK Manager,选择Google Play services 和Google Repository,并且点击install
2.在app级的build.gradle中添加apply plugin: 'com.google.gms.google-services'后报异常
Error:Execution failed for task ':app:processDebugGoogleServices'.
> File google-services.json is missing. The Google Services Plugin cannot function without it.
Searched Location:
E:\research\gp\downloadApk\app\src\debug\google-services.json
E:\research\gp\downloadApk\app\google-services.json
解决办法：打开网址https://developers.google.com/mobile/add?platform=android&cntapi=signin&cnturl=https:%2F%2Fdevelopers.google.com%2Fidentity%2Fsign-in%2Fandroid%2Fsign-in%3Fconfigured%3Dtrue&cntlbl=Continue%20Adding%20Sign-In然后点击下载JSON，将下载下来的json放在目录E:\research\gp\downloadApk\app下（E:\research\gp\downloadApk\app为代码su）
3.当把json放到规定目录下后报的异常：
Error:Execution failed for task ':app:processDebugGoogleServices'.
> Missing project_info object
解决办法：应该从创建该json的地方下载该文件，地址：
https://developers.google.com/mobile/add?platform=android&cntapi=signin&cnturl=https:%2F%2Fdevelopers.google.com%2Fidentity%2Fsign-in%2Fandroid%2Fsign-in%3Fconfigured%3Dtrue&cntlbl=Continue%20Adding%20Sign-In
点击choose and configure services->,然后点击ENABLE GOOGLE SIGN-IN
然后点击Generate configuration files ->
点击Continue Adding Sign-In ->
然后重新进入主页：https://developers.google.com/mobile/add?platform=android&cntapi=signin&cnturl=https:%2F%2Fdevelopers.google.com%2Fidentity%2Fsign-in%2Fandroid%2Fsign-in%3Fconfigured%3Dtrue&cntlbl=Continue%20Adding%20Sign-In
点击Choose and configure services ->
点击Generate configuration files->
点击Download gogle-services.json
4.方法handleSignInResult(GoogleSignInResult result)中result.isSuccess()返回false，一般是授权没有正确配置
解决办法：
打开API控制台界面：https://console.developers.google.com/cloud-resource-manager，如果没有项目，则先创建一个项目，如果项目已经存在，则从项目中选择一个
然后点击左上角的三条横岗图标-->API管理器-->信息中心
点击启用API，并搜索Google Play Android Developer API ,点击该API,然后点击启用
点击在API Explorer中试用此API,然后开启Authorize requests using OAuth 2.0，勾选复选框，并点击Authorize
重新回退到信息API管理器界面https://console.developers.google.com/apis/api/androidpublisher.googleapis.com/overview?project=test-analytics-f14b6&duration=PT1H，并点击创建凭据，选择OAuth客户端ID
选择Android
启动cmd控制台，并输入命令获取签名文件的SHA1值keytool -list -v -keystore E:\research\gp\downloadApk\app\download.keystore，“ E:\research\gp\downloadApk\app\download.keystore”为文件所在的完整路径
拷贝SHA1的值，输入包名，并点击创建
然后重新点击创建凭据-->OAuth客户端ID-->网页应用-->创建
5.获取到的token为空
解决办法：
gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
// .requestIdToken(getString(R.string.default_web_client_id))
.requestIdToken(getString(R.string.default_web_client_id))
.requestEmail()
.build();创建GoogleSignInOptions对象时，加上requestIdToken方法
.requestIdToken(getString(R.string.default_web_client_id))
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