Google Plus Api登入

這篇要來介紹的是 如何使用Google+登入，要使用Google Plus登入App，在Coding之前有幾件事情要先做
●打包你的正式keystore，並取得SHA-1 指紋
●到你的Google Api主控台進行登記
下面會有圖文介紹
若還有疑問可以來看官方介紹
當你登記好你的專案後，Code的部分也很簡單，下面的Android專案演示在登入後取得個人資料，與登出

1.產生正式 keystore

我的習慣是在專案內多開一個資料夾取名叫keystore
將產生出來的檔案放在裡面

2.取得SHA-1 指紋

這邊要使用JDK的keytool工具
1.打開cmd視窗
2.切換路徑到你的JDK的bin資料夾 指令:(cd C:\Program Files\Java\jdk1.8.0_45\bin)
3.查詢keystore 指令:(keytool -list -v -keystore "C:\Users\Anson\Desktop\MyApplication\keystore\keystore.jks")

2.到Google Api主控台進行登記

點選 建立專案

完成後 點選進入Google+ API

點選新增憑證 -> O Auth 2.0用戶端編號

點選設定同意畫面

點選Android，並貼上你的SHA-1與專案package name

3.回到Android

這個domo專案我在build.gradle引用兩個Lib
1.Google Play Service
2.AQuery(單純用來演示load頭像圖片而已)

compile 'com.google.android.gms:play-services:7.5.0'
compile 'com.googlecode.android-query:android-query:0.25.9'

先來看Layout

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="10dp"
    android:gravity="center_horizontal"
    tools:context=".MainActivity">


    <TextView
        android:padding="5dp"
        android:id="@+id/contentTv"
        android:text="Hello world"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <ImageView
        android:src="@android:drawable/ic_menu_gallery"
        android:padding="5dp"
        android:background="#B467C5"
        android:id="@+id/photoIv"
        android:layout_width="100dp"
        android:layout_height="100dp" />

    <com.google.android.gms.common.SignInButton
        android:id="@+id/signInBtn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        />

    <Button
        android:text="登出"
        android:id="@+id/logoutBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
</LinearLayout>

再來看java code

import android.content.Intent;
import android.content.IntentSender;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;


import com.androidquery.AQuery;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.plus.Plus;
import com.google.android.gms.plus.model.people.Person;

public class MainActivity extends AppCompatActivity implements
        View.OnClickListener,
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener {

    private static final int RC_SIGN_IN = 0;
    private GoogleApiClient mGoogleApiClient;

    private AQuery mAQuery;

    private TextView mContentTv;
    private ImageView mPhotoIv;
    private SignInButton mSignInButton;
    private Button mLogoutBtn;

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

        mContentTv = (TextView)findViewById(R.id.contentTv);
        mPhotoIv = (ImageView)findViewById(R.id.photoIv);
        mSignInButton = (SignInButton)findViewById(R.id.signInBtn);
        mLogoutBtn = (Button)findViewById(R.id.logoutBtn);
        mSignInButton.setOnClickListener(this);
        mLogoutBtn.setOnClickListener(this);

        mAQuery = new AQuery(this);
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(Plus.API, Plus.PlusOptions.builder().build())
                .addScope(Plus.SCOPE_PLUS_LOGIN)
                .build();

    }

    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.signInBtn:
                mGoogleApiClient.connect();
                break;
            case R.id.logoutBtn:
                if(mGoogleApiClient.isConnected()){
                    Plus.AccountApi.clearDefaultAccount(mGoogleApiClient);
                    mGoogleApiClient.disconnect();
                    mLogoutBtn.setVisibility(View.GONE);
                    mContentTv.setText("已登出~~~");
                }
                break;
        }
    }

    @Override
    public void onConnected(Bundle bundle) {
        try {
            if (Plus.PeopleApi.getCurrentPerson(mGoogleApiClient) != null) {
                Person currentPerson = Plus.PeopleApi.getCurrentPerson(mGoogleApiClient);
                String personName = currentPerson.getDisplayName();
                String personEmail = Plus.AccountApi.getAccountName(mGoogleApiClient);
                int gender = currentPerson.getGender();
                String plusId = currentPerson.getId();
                String personPhotoUrl = currentPerson.getImage().getUrl();

                String content = "PersonName:"+personName+"\n";
                content += "PersonEmail:"+personEmail+"\n";
                content += "Gender:"+gender+"\n";
                content += "PlusId:"+plusId;
                mContentTv.setText(content);
                mAQuery.id(mPhotoIv).image(personPhotoUrl, true, true, 0, android.R.drawable.ic_menu_gallery);

                mSignInButton.setVisibility(View.GONE);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void onConnectionSuspended(int i) {
        mGoogleApiClient.connect();
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        try {
            connectionResult.startResolutionForResult(this, RC_SIGN_IN);
        } catch (IntentSender.SendIntentException e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int responseCode, Intent intent) {
        switch (requestCode) {
            case RC_SIGN_IN:
                if (!mGoogleApiClient.isConnecting()) {
                    mGoogleApiClient.connect();
                }
                break;
        }
    }
}

最後還有Manifest要加上網路權限

<uses-permission android:name="android.permission.INTERNET"/>

4.完成了！來看效果吧

要測試時記得打包正式apk檔
安裝到模擬器或實機上才能正常run喔!