步驟1：在Android Studio 建立App「GoogleLogin」，在 MainActivity.java 輸入以下程式碼。
package com.amin.googlelogin;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
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.Scopes;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.common.api.ApiException;
import com.google.android.gms.common.api.Scope;
import com.google.android.gms.tasks.Task;
public class MainActivity extends AppCompatActivity {
private SignInButton signInButton;
private static final int RC_SIGN_IN = 1;
//https://stackoverflow.com/questions/47437678/why-do-i-get-com-google-android-gms-common-api-apiexception-10
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 設定 Google 登入 Client
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestScopes(new Scope(Scopes.OPEN_ID), new Scope(Scopes.PLUS_ME))
.requestIdToken(getString(R.string.default_web_client_id))
.requestProfile()
.requestEmail()
.build();
final GoogleSignInClient mGoogleSignInClient = GoogleSignIn.getClient(this, gso);
SignInButton signInBtn = findViewById(R.id.login_button);
signInBtn.setOnClickListener(new View.OnClickListener() {
private void signIn() {
Intent signInIntent = mGoogleSignInClient.getSignInIntent();
startActivityForResult(signInIntent, RC_SIGN_IN);
}
public void onClick(View v) {
switch (v.getId()) {
case R.id.login_button:
signIn();
break;
}
}
});
}
//https://developers.google.com/android/reference/com/google/android/gms/auth/api/signin/GoogleSignInAccount
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
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);
}
}
private void handleSignInResult(Task<GoogleSignInAccount> completedTask) {
try {//代表有成功
GoogleSignInAccount account = completedTask.getResult(ApiException.class);
// Signed in successfully, show authenticated UI.
Log.d("GoogleLoginlog", "DisplayName : " + account.getDisplayName());
Log.d("GoogleLoginlog", "GivenName : " + account.getGivenName());
Log.d("GoogleLoginlog", "FamilyName : " + account.getFamilyName());
Log.d("GoogleLoginlog", "Email : " + account.getEmail());
Log.d("GoogleLoginlog", "Id : " + account.getId());
Log.d("GoogleLoginlog", "idtoken : " + account.getIdToken());
Log.d("GoogleLoginlog", "PhotoUrl : " + account.getPhotoUrl());
Intent it = new Intent(this, showinfo.class);
it.putExtra("displayname", account.getDisplayName());
it.putExtra("givenname", account.getGivenName());
it.putExtra("familyname", account.getFamilyName());
it.putExtra("id", account.getId());
it.putExtra("idtoken", account.getIdToken());
it.putExtra("email", account.getEmail());
it.putExtra("photourl", account.getPhotoUrl().toString());
startActivity(it);
} catch (ApiException e) {//代表沒成功
// 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());
}
}
}
在 activity_main.xml 添加 <com.google.android.gms.common.SignInButton
android:id="@+id/login_button"
android:layout_width="246dp"
android:layout_height="75dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.496"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.453" />
步驟2：新增「showinfo」的 Empty Activity，在 showinfo.java 輸入以下程式碼。package com.amin.googlelogin;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.auth.api.signin.GoogleSignIn;
import com.google.android.gms.auth.api.signin.GoogleSignInClient;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
public class showinfo extends AppCompatActivity {
private Button logoutBtn;
GoogleSignInClient mGoogleSignInClient;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_showinfo);
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);
final Button m_button = (Button) findViewById(R.id.button);
m_button.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View v) {
Intent it = new Intent(showinfo.this, MainActivity.class);
startActivity(it);
finish();
}
});
logoutBtn = findViewById(R.id.logoutBtn);
logoutBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
signOut();
}
});
TextView result = null;
Intent intent = getIntent();
String displayname = intent.getStringExtra("displayname");
result = (TextView) findViewById(R.id.displayname);
result.setText("使用者displayname : " + displayname);
String givenname = intent.getStringExtra("givenname");
result = (TextView) findViewById(R.id.givenname);
result.setText("使用者givenname : " + givenname);
String familyname = intent.getStringExtra("familyname");
result = (TextView) findViewById(R.id.familyname);
result.setText("使用者familyname : " + familyname);
String id = intent.getStringExtra("id");
result = (TextView) findViewById(R.id.id);
result.setText("使用者id : " + id);
String idtoken = intent.getStringExtra("idtoken");
result = (TextView) findViewById(R.id.idtoken);
result.setText("使用者idtoekn : " + idtoken);
String email = intent.getStringExtra("email");
result = (TextView) findViewById(R.id.email);
result.setText("使用者email : " + email);
String photourl = intent.getStringExtra("photourl");
result = (TextView) findViewById(R.id.photourl);
result.setText("圖片連結 : " + photourl);
}
private void signOut() {
mGoogleSignInClient.signOut()
.addOnCompleteListener(this, new OnCompleteListener() {
@Override
public void onComplete(@NonNull Task task) {
Intent intent = new Intent(showinfo.this, MainActivity.class);
startActivity(intent);
}
});
Toast.makeText(this, "登出成功!!", Toast.LENGTH_SHORT).show();
}
}
在 activity_showinfo.xml 添加 <TextView
android:id="@+id/idtoken"
android:layout_width="300dp"
android:layout_height="50dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.405"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.599" />
<TextView
android:id="@+id/photourl"
android:layout_width="300dp"
android:layout_height="60dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.405"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.845" />
<TextView
android:id="@+id/id"
android:layout_width="300dp"
android:layout_height="40dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.378"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.499" />
<TextView
android:id="@+id/familyname"
android:layout_width="300dp"
android:layout_height="40dp"
android:layout_margin="10dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.378"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.384" />
<Button
android:id="@+id/logoutBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:text="登出"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.049" />
<TextView
android:id="@+id/givenname"
android:layout_width="300dp"
android:layout_height="40dp"
android:layout_margin="10dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.351"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.264" />
<TextView
android:id="@+id/displayname"
android:layout_width="300dp"
android:layout_height="40dp"
android:layout_margin="10dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.351"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.159" />
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="返回"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.13"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.049" />
<TextView
android:id="@+id/email"
android:layout_width="300dp"
android:layout_height="40dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.378"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.713" />
步驟3：在「專案」的 build.gradle 添加 「classpath 'com.google.gms:google-services:4.3.5'」。
步驟4：在「模組」的 build.gradle 添加 「implementation 'com.google.android.gms:play-services-auth:19.0.0'」。
步驟5：在 AndroifManifest.xml 添加 「<uses-permission android:name="android.permission.INTERNET" />」。
步驟6：點擊 Gradle > Tasks > android > signingReport，產生SHA1金鑰。
步驟7：到 Google APIs https://console.developers.google.com/apis/credentials，新增憑證服務，這一步一定要做，不然 MainActivity.java中，第62行無法成功執行。
(1) 點擊 建立憑證。
(2) 點擊「Android」。
(3) 輸入建立 「建立OAuth 用戶端 ID」所需資料。
(4) 最後完成建立。
最後 Build 專案。
(2) 點擊「Android」。
(3) 輸入建立 「建立OAuth 用戶端 ID」所需資料。
(4) 最後完成建立。
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