1

我正在按照本指南在我的 Android 应用程序中通过 Facebook 设置社交登录：https ://developers.facebook.com/docs/facebook-login/android/permissions

使用 FacebookLoginButton设置回调来处理用户身份验证结果很容易：

facebookCallbackManager = CallbackManager.Factory.create();
final LoginButton facebookLoginButton = findViewById(R.id.facebook);
facebookLoginButton.setReadPermissions(Collections.singletonList(EMAIL));
LoginManager.getInstance().registerCallback(facebookCallbackManager,
        new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {
                final String accessToken = loginResult.getAccessToken().getToken();
                ...
            }

            @Override
            public void onCancel() {
            }

            @Override
            public void onError(FacebookException exception) {
            }
        });

但是当我与其他 Android 按钮交换时LoginButton，我无法再使用该setReadPermissions功能。

我的问题是：使用自定义登录按钮时，如何向 Facebook 请求用户的电子邮件许可？

4

2 回答 2

2

添加onClickListener您的自定义按钮并在inside上调用logInWithReadPermissions方法。此方法接受用户请求的权限列表。LoginManageronClick

完整示例：

facebookCallbackManager = CallbackManager.Factory.create();
final MyFacebookButton facebookLoginButton = findViewById(R.id.facebook);
LoginManager.getInstance().registerCallback(facebookCallbackManager,
        new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {
                ...
            }

            @Override
            public void onCancel() {
            }

            @Override
            public void onError(FacebookException exception) {
            }
        });
facebookLoginButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        LoginManager
                .getInstance()
                .logInWithReadPermissions(
                        LoginActivity.this,
                        Collections.singletonList(EMAIL)
                );
    }
});
于 2018-01-24T10:45:38.060 回答
0 
private CallbackManager mCallbackManager;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

FacebookSdk.sdkInitialize(this.getApplicationContext());

mCallbackManager = CallbackManager.Factory.create();

LoginManager.getInstance().registerCallback(mCallbackManager,
        new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {
                Log.d("Success", "Login");

            }

            @Override
            public void onCancel() {
                Toast.makeText(MainActivity.this, "Login Cancel", Toast.LENGTH_LONG).show();
            }

            @Override
            public void onError(FacebookException exception) {
                Toast.makeText(MainActivity.this, exception.getMessage(), Toast.LENGTH_LONG).show();
            }
        });

setContentView(R.layout.activity_main);

Button btn_fb_login = (Button)findViewById(R.id.btn_fb_login);

btn_fb_login.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
          LoginManager.getInstance().logInWithReadPermissions(this, Arrays.asList("public_profile", "user_friends"));
    }
});

}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent 
data) {
super.onActivityResult(requestCode, resultCode, data);
if(mCallbackManager.onActivityResult(requestCode, resultCode, data)) {
    return;
}
}
于 2018-01-24T10:49:45.710 回答