谷歌账户登录开发示例（集成）

最近项目上业务需要，查的资料说的比较乱（主要是集成那块）

1，修改app的build.gradle，增加

implementation'com.google.android.gms:play-services-auth:18.0.0'

2，布局文件中登录按钮

<com.google.android.gms.common.SignInButton

    android:id="@+id/sign_in_button"

    app:layout_constraintTop_toTopOf="parent"

    app:layout_constraintBottom_toBottomOf="parent"

    app:layout_constraintEnd_toEndOf="parent"

    app:layout_constraintStart_toStartOf="parent"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content" />

3，登录相关代码

SignInButton signInButton = findViewById(R.id.sign_in_button);

signInButton.setSize(SignInButton.SIZE_WIDE);

GoogleSignInOptions gso =new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)

.requestEmail()

.requestId()

.build();

mGoogleSignInClient = GoogleSignIn.getClient(this, gso);

signInButton.setOnClickListener(new View.OnClickListener() {

@Override

    public void onClick(View v) {

Intent signInIntent =mGoogleSignInClient.getSignInIntent();

        startActivityForResult(signInIntent, RC_SIGN_IN);

    }

});

@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 task = GoogleSignIn.getSignedInAccountFromIntent(data);

        handleSignInResult(task);

    }

}

4，跳转处理

private GoogleSignInClientmGoogleSignInClient;

    private int RC_SIGN_IN =10000;

    private void handleSignInResult(Task completedTask) {

try {

GoogleSignInAccount account = completedTask.getResult(ApiException.class);

            Log.w("Google email",account.getEmail());

            Log.w("Google id",account.getId());

            // Signed in successfully, show authenticated UI.

            Intent intent =new Intent(LoginActivity.this,MainActivity.class);

            startActivity(intent);

            finish();

//            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("Google login", "signInResult:failed code=" + e.getStatusCode());

//            updateUI(null);

        }

}