1 注冊(cè)Google賬戶

創(chuàng)建地址

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2 申請(qǐng)開發(fā)者

25美元呢

開發(fā)者申請(qǐng)

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3 創(chuàng)建憑據(jù)

創(chuàng)建憑據(jù)

選擇客戶端ID

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4 開發(fā)

官網(wǎng)文檔

（1）環(huán)境配置

在Android Studio中，選擇工具> Android> SDK Manager骄瓣。
滾動(dòng)到包列表的底部，然后選擇其他> Google Repository算芯。該軟件包將下載到您的計(jì)算機(jī)并安裝在SDK環(huán)境中的android-sdk-folder / extras / google / google_play_services中努咐。

（2）添加Google Play服務(wù)

在項(xiàng)目的頂級(jí)build.gradle文件中嫂侍，確保包含Google的Maven存儲(chǔ)庫(kù)

allprojects {
    repositories {
        google()

        // If you're using a version of Gradle lower than 4.1, you must instead use:
        // maven {
        //     url 'https://maven.google.com'
        // }
    }
}

然后恃疯，在您的應(yīng)用級(jí)build.gradle文件中漏设，將Google Play服務(wù)聲明為依賴項(xiàng)：

apply plugin: 'com.android.application'
    ...

    dependencies {
        compile 'com.google.android.gms:play-services-auth:15.0.1'
    }

(3)配置Google登錄和GoogleSignInClient對(duì)象

• onCreate方法中

// 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 GoogleSignInClient with the options specified by gso.
mGoogleSignInClient = GoogleSignIn.getClient(this, gso);

• onStart方法中檢查用戶是否已使用Google登錄您的應(yīng)用

// 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);

(4)將Google登錄按鈕添加到您的應(yīng)用 (可選)

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

[圖片上傳失敗...(image-c9a06c-1546480407359)]

(5 )登錄

private void signIn() {
    Intent signInIntent = mGoogleSignInClient.getSignInIntent();
    startActivityForResult(signInIntent, RC_SIGN_IN);
}

在活動(dòng)的onActivityResult方法中為用戶獲取對(duì)象。

@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);
    }
}

GoogleSignInAccount對(duì)象包含有關(guān)已登錄用戶的信息今妄，例如用戶的名稱

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);
    }
}

(6)獲取資料

GoogleSignInAccount acct = GoogleSignIn.getLastSignedInAccount(getActivity());
if (acct != null) {
  String personName = acct.getDisplayName();
  String personGivenName = acct.getGivenName();
  String personFamilyName = acct.getFamilyName();
  String personEmail = acct.getEmail();
  String personId = acct.getId();
  Uri personPhoto = acct.getPhotoUrl();
}

(7)退出登錄

private void signOut() {
    mGoogleSignInClient.signOut()
            .addOnCompleteListener(this, new OnCompleteListener<Void>() {
                @Override
                public void onComplete(@NonNull Task<Void> task) {
                    // ...
                }
            });
}

(8)斷開帳戶

private void revokeAccess() {
    mGoogleSignInClient.revokeAccess()
            .addOnCompleteListener(this, new OnCompleteListener<Void>() {
                @Override
                public void onComplete(@NonNull Task<Void> task) {
                    // ...
                }
            });
}

坑

（1）服務(wù)端需要token 但是 我們得到的token == null

   GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestIdToken(getString(R.string.server_client_id))
                .requestEmail()
                .build();

server_client_id哪里來(lái)的

文檔鏈接

創(chuàng)建配置

選擇web server

選擇剛剛創(chuàng)建的