facebook android getEmail

Question

我正在尝试获取已登录Facebook的用户电子邮件。

这是我的代码String userId=(String) user.asMap().get("email");它返回null，我该如何解决？

我读到可能需要设置会话权限？这个许可是什么？我在哪里需要写这个权限？

也许是另一个问题？

Settings.addLoggingBehavior(LoggingBehavior.INCLUDE_ACCESS_TOKENS);

        Session session = Session.getActiveSession();
        if (session == null) {
            if (savedInstanceState != null) {
                session = Session.restoreSession(this, null, statusCallback, savedInstanceState);
            }
            if (session == null) {
                session = new Session(this);
            }
            Session.setActiveSession(session);
            if (session.getState().equals(SessionState.CREATED_TOKEN_LOADED)) {
                session.openForRead(new Session.OpenRequest(this).setCallback(statusCallback));
            }
        }

        updateView();

   //    End of OnCreate Method>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
    }

    @Override
    public void onStart() {
        super.onStart();
        Session.getActiveSession().addCallback(statusCallback);
    }

    @Override
    public void onStop() {
        super.onStop();
        Session.getActiveSession().removeCallback(statusCallback);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        Session.getActiveSession().onActivityResult(this, requestCode, resultCode, data);
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        Session session = Session.getActiveSession();
        Session.saveSession(session, outState);
    }

    private void updateView() {
        Session session = Session.getActiveSession();
        session.openForRead(new Session.OpenRequest(this).setPermissions(Arrays.asList("email")));

        if (session.isOpened()) {
            //button logout string
            buttonLoginLogout.setOnClickListener(new OnClickListener() {
                public void onClick(View view) { onClickLogout(); }
            });
        } else {
            //button log in string
            buttonLoginLogout.setOnClickListener(new OnClickListener() {
                public void onClick(View view) { onClickLogin(); }
            });
        }
    }

    private void onClickLogin() {
        Session session = Session.getActiveSession();
        if (!session.isOpened() && !session.isClosed()) {
            session.openForRead(new Session.OpenRequest(this).setCallback(statusCallback));
        } else {
            Session.openActiveSession(this, true, statusCallback);
        }
    }

    private void onClickLogout() {
        Session session = Session.getActiveSession();
        if (!session.isClosed()) {
            session.closeAndClearTokenInformation();
        }
    }

    private class SessionStatusCallback implements Session.StatusCallback {
        @Override
        public void call(Session session, SessionState state, Exception exception) {
            if( session.isOpened() ){
                Request.executeMeRequestAsync(session, new Request.GraphUserCallback() {

                    @Override
                    public void onCompleted(GraphUser user, Response response) {
                        Intent i = new Intent(getApplicationContext(), ProfileActivity.class);
                        String userId=(String) user.asMap().get("email");
                        i.putExtra("epuzzle",userId  );
                        startActivity(i);
                    }
                });
            }
            updateView();
        }


    }

这是我的清单文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.sale"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true"/>

    <uses-sdk
        android:minSdkVersion="11"
        android:targetSdkVersion="10" />
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.CAMERA"/>
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
    <!-- The following two permissions are not required to use
     Google Maps Android API v2, but are recommended. -->
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
    <permission
        android:name="com.example.sale.permission.MAPS_RECEIVE"
        android:protectionLevel="signature"/>
        <uses-permission android:name="com.example.sale.permission.MAPS_RECEIVE"/>



    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >



        <activity
            android:name="com.example.sale.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>


              </activity>

         <!--  Entry for RegisterActivity.class -->
        <activity android:name=".RegisterActivity"
                  android:label="Register New Account"></activity>
        <meta-data android:value="@string/app_id" android:name="com.facebook.sdk.ApplicationId"/>
        <activity android:label="@string/app_name" android:name="com.facebook.LoginActivity"></activity>
        <activity android:name=".ProfileActivity" android:label="Profile page"></activity>

        <meta-data
              android:name="com.google.android.maps.v2.API_KEY"
              android:value="AIzaSyDTVRXMTmfe3jZyAlt-87kRgqM8y4TzIto"/>

    </application>

</manifest>

Answer 1

当您使用Facebook类型的API时，需要Internet权限。请按照以下步骤操作

• 打开Androidmanifest.xml文件
• 在标记后声明权限<uses-permission android:name="android.permission.INTERNET" />。