我可以得到所有这些东西,如下面的代码所示,但无法从用户配置文件中检索电子邮件.
我该怎么办？
任何一种帮助将不胜感激.
早些时候,我使用这个来源获取Facebook用户的详细信息,并且没有任何麻烦地获取数据(包括电子邮件)：
public class MainActivity extends Activity {
private Session.StatusCallback sessionStatusCallback;
private Session currentSession;
private Button login;
private Button logout;
private Button publishButton;
private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = (TextView) findViewById(R.id.textView);
// create instace for sessionStatusCallback
sessionStatusCallback = new Session.StatusCallback() {
@Override
public void call(Session session,SessionState state,Exception exception) {
onSessionStateChange(session,state,exception);
}
};
login = (Button) findViewById(R.id.loginButton);
login.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
connectToFB();
}
});
logout = (Button) findViewById(R.id.logoutButton);
logout.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (currentSession != null) {
currentSession.closeAndClearTokenInformation();
...
}
}
});
// publish button
publishButton = (Button) findViewById(R.id.publishButton);
publishButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
publishStory();
}
});
}
public void connectToFB() {
List<String> permissions = new ArrayList<String>();
permissions.add("publish_actions");
currentSession = new Session.Builder(this).build();
currentSession.addCallback(sessionStatusCallback);
Session.OpenRequest openRequest = new Session.OpenRequest(
MainActivity.this);
openRequest.setLoginBehavior(SessionLoginBehavior.SUPPRESS_SSO);
openRequest.setRequestCode(Session.DEFAULT_AUTHORIZE_ACTIVITY_CODE);
openRequest.setPermissions(permissions);
currentSession.openForPublish(openRequest);
}
@Override
public void onActivityResult(int requestCode,int resultCode,Intent data) {
super.onActivityResult(requestCode,resultCode,data);
if (currentSession != null) {
currentSession
.onActivityResult(this,requestCode,data);
}
}
private void onSessionStateChange(Session session,Exception exception) {
if (session != currentSession) {
return;
}
if (state.isOpened()) {
// Log in just happened.
Toast.makeText(getApplicationContext(),"session opened",Toast.LENGTH_SHORT).show();
Request.executeMeRequestAsync(session,new Request.GraphUserCallback() {
@Override
public void onCompleted(GraphUser user,Response response) {
String fbId = user.getId();
String fbName = user.getName();
String gender = user.asMap().get("gender").toString();
String email = user.asMap().get("email").toString();
String first = user.asMap().get("first_name").toString();
String last = user.asMap().get("last_name").toString();
textView.setText("Id: " + fbId + ",Name: " + fbName + ",Gender: " + gender + ",EmailID: " + email + ",First: " + first + ",Last: " + last);
}
});
} else if (state.isClosed()) {
// Log out just happened. Update the UI.
Toast.makeText(getApplicationContext(),"session closed",Toast.LENGTH_SHORT).show();
}
}
public void publishStory() {
....
}
}
现在我在我的一个项目中使用相同的代码,但总是得到：
E/AndroidRuntime﹕ FATAL EXCEPTION: main java.lang.NullPointerException at c.o.m.MainActivity$5.onCompleted(MainActivity.java:262) at com.facebook.Request$1.onCompleted(Request.java:303) at com.facebook.Request$4.run(Request.java:1726) at android.os.Handler.handleCallback(Handler.java:615) at android.os.Handler.dispatchMessage(Handler.java:92) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:4921) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511)
在这条线上,我得到了NPE：
String email = user.asMap().get("email").toString();
码：
public class MainActivity extends Activity {
Button btnFBLogin,btnGPLogin;
private Session.StatusCallback sessionStatusCallback;
private Session currentSession;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.screen_layout);
sessionStatusCallback = new Session.StatusCallback() {
@Override
public void call(Session session,exception);
}
};
btnFBLogin = (Button) findViewById(R.id.loginFB);
btnFBLogin.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
connectToFB();
}
});
}
public void connectToFB() {
List<String> permissions = new ArrayList<String>();
permissions.add("publish_actions");
currentSession = new Session.Builder(this).build();
currentSession.addCallback(sessionStatusCallback);
Session.OpenRequest openRequest = new Session.OpenRequest(
MainActivity.this);
openRequest.setLoginBehavior(SessionLoginBehavior.SUPPRESS_SSO);
openRequest.setRequestCode(Session.DEFAULT_AUTHORIZE_ACTIVITY_CODE);
openRequest.setPermissions(permissions);
currentSession.openForPublish(openRequest);
}
@Override
public void onActivityResult(int requestCode,Response response) {
String fbId = user.getId();
String fbName = user.getName();
String gender = user.asMap().get("gender").toString();
String email = user.asMap().get("email").toString();
String first = user.asMap().get("first_name").toString();
String last = user.asMap().get("last_name").toString();
Toast.makeText(MainActivity.this,"EmailId:- "+email,Toast.LENGTH_LONG).show();
}
});
} else if (state.isClosed()) {
// Log out just happened. Update the UI.
Toast.makeText(getApplicationContext(),Toast.LENGTH_SHORT).show();
}
}
}
可能是什么原因？为什么它的发生？
