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我想通過Facebook登錄後獲取用戶電子郵件ID。我嘗試了幾乎所有的解決方案。但它總是返回null。如何通過Facebook集成獲取電子郵件ID Android
這是我的活動課。如果任何一個有解決辦法請回復
01-02 15:22:13.673 24567-24587/com.example.facebook W/EGL_emulation: eglSurfaceAttrib not implemented
01-02 15:22:13.673 24567-24587/com.example.facebook W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xa143ec80, error=EGL_SUCCESS
01-02 15:22:14.779 24567-24567/com.example.facebook W/System.err: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null object reference
01-02 15:22:14.780 24567-24567/com.example.facebook W/System.err: at com.example.facebook.MainActivity.updateUI(MainActivity.java:198)
01-02 15:22:14.780 24567-24567/com.example.facebook W/System.err: at com.example.facebook.MainActivity.access$200(MainActivity.java:24)
01-02 15:22:14.780 24567-24567/com.example.facebook W/System.err: at com.example.facebook.MainActivity$3.onUserInfoFetched(MainActivity.java:90)
01-02 15:22:14.781 24567-24567/com.example.facebook W/System.err: at com.facebook.widget.LoginButton$1.onCompleted(LoginButton.java:630)
01-02 15:22:14.781 24567-24567/com.example.facebook W/System.err: at com.facebook.Request$1.onCompleted(Request.java:269)
01-02 15:22:14.781 24567-24567/com.example.facebook W/System.err: at com.facebook.Request$4.run(Request.java:1669)
01-02 15:22:14.781 24567-24567/com.example.facebook W/System.err: at android.os.Handler.handleCallback(Handler.java:739)
01-02 15:22:14.781 24567-24567/com.example.facebook W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)
01-02 15:22:14.782 24567-24567/com.example.facebook W/System.err: at android.os.Looper.loop(Looper.java:148)
01-02 15:22:14.782 24567-24567/com.example.facebook W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5417)
01-02 15:22:14.782 24567-24567/com.example.facebook W/System.err: at java.lang.reflect.Method.invoke(Native Method)
01-02 15:22:14.782 24567-24567/com.example.facebook W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
01-02 15:22:14.783 24567-24567/com.example.facebook W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
01-02 15:22:14.887 24567-24573/com.example.facebook W/art: Suspending all threads took: 31.994ms
：
public class MainActivity extends FragmentActivity {
String TAG = "MainActivity";
private final String PENDING_ACTION_BUNDLE_KEY = "pending_action";
private static final String PERMISSION = "publish_actions";
private Button postStatusUpdateButton;
private LoginButton loginButton;
private ProfilePictureView profilePictureView;
private TextView greeting;
private PendingAction pendingAction = PendingAction.NONE;
private GraphUser user;
private GraphPlace place;
private List<GraphUser> tags;
private boolean canPresentShareDialog;
private enum PendingAction {
NONE, POST_STATUS_UPDATE
}
private UiLifecycleHelper uiHelper;
private Session.StatusCallback callback = new Session.StatusCallback() {
@Override
public void call(Session session, SessionState state,
Exception exception) {
onSessionStateChange(session, state, exception);
}
};
private FacebookDialog.Callback dialogCallback = new FacebookDialog.Callback() {
@Override
public void onError(FacebookDialog.PendingCall pendingCall,
Exception error, Bundle data) {
Log.d(TAG, String.format("Error: %s", error.toString()));
}
@Override
public void onComplete(FacebookDialog.PendingCall pendingCall,
Bundle data) {
Log.d(TAG, "Success!");
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
uiHelper = new UiLifecycleHelper(this, callback);
uiHelper.onCreate(savedInstanceState);
// Can we present the share dialog for regular links?
canPresentShareDialog = FacebookDialog.canPresentShareDialog(this, FacebookDialog.ShareDialogFeature.SHARE_DIALOG);
if (savedInstanceState != null) {
String name = savedInstanceState.getString(PENDING_ACTION_BUNDLE_KEY);
pendingAction = PendingAction.valueOf(name);
}
setContentView(R.layout.activity_main);
loginButton = (LoginButton) findViewById(R.id.login_button);
loginButton.setUserInfoChangedCallback(new LoginButton.UserInfoChangedCallback() {
@Override
public void onUserInfoFetched(GraphUser user) {
MainActivity.this.user = user;
updateUI();
// It's possible that we were waiting for this.user to
// be populated in order to post a status update.
handlePendingAction();
}
});
profilePictureView = (ProfilePictureView) findViewById(R.id.profilePicture);
greeting = (TextView) findViewById(R.id.greeting);
postStatusUpdateButton = (Button) findViewById(R.id.postStatusUpdateButton);
postStatusUpdateButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
performPublish(PendingAction.POST_STATUS_UPDATE, canPresentShareDialog);
}
});
}
//override lifecycle methods so that UiLifecycleHelper know about state of the activity
@Override
protected void onResume() {
super.onResume();
uiHelper.onResume();
updateUI();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
uiHelper.onSaveInstanceState(outState);
outState.putString(PENDING_ACTION_BUNDLE_KEY, pendingAction.name());
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
uiHelper.onActivityResult(requestCode, resultCode, data, dialogCallback);
}
@Override
public void onPause() {
super.onPause();
uiHelper.onPause();
}
@Override
public void onDestroy() {
super.onDestroy();
uiHelper.onDestroy();
}
private void onSessionStateChange(Session session, SessionState state, Exception exception) {
if (state.isOpened()) {
Toast.makeText(getApplicationContext(), "User logged in...", Toast.LENGTH_SHORT).show();
} else if (state.isClosed()) {
Toast.makeText(getApplicationContext(), "User logged out...", Toast.LENGTH_SHORT).show();
}
if (pendingAction != PendingAction.NONE
&& (exception instanceof FacebookOperationCanceledException
|| exception instanceof FacebookAuthorizationException)) {
new AlertDialog.Builder(MainActivity.this)//if permission is not granted
.setTitle(R.string.cancelled)
.setMessage(R.string.permission_not_granted)
.setPositiveButton(R.string.ok, null).show();
pendingAction = PendingAction.NONE;
} else if (state == SessionState.OPENED_TOKEN_UPDATED) {
handlePendingAction();
}
updateUI();
}
private void updateUI() {
Session session = Session.getActiveSession();
boolean enableButtons = (session != null && session.isOpened());
postStatusUpdateButton.setEnabled(enableButtons
|| canPresentShareDialog);
if (enableButtons && user != null) {
profilePictureView.setProfileId(user.getId());
greeting.setText(getString(R.string.hello_user, user.getName()));
try {
List<String> permissions = new ArrayList<String>();
permissions.add("email");
String fbemail = user.getProperty("email").toString();
Toast.makeText(MainActivity.this, ".....emai...."+ fbemail, Toast.LENGTH_LONG).show();
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
} else {
profilePictureView.setProfileId(null);
greeting.setText(null);
}
}
@SuppressWarnings("incomplete-switch")
private void handlePendingAction() {
PendingAction previouslyPendingAction = pendingAction;
// These actions may re-set pendingAction if they are still pending, but we assume they
// will succeed.
pendingAction = PendingAction.NONE;
switch (previouslyPendingAction) {
case POST_STATUS_UPDATE:
postStatusUpdate();
break;
}
}
private interface GraphObjectWithId extends GraphObject {
String getId();
}
private void showPublishResult(String message, GraphObject result,
FacebookRequestError error) {
String title = null;
String alertMessage = null;
if (error == null) {
title = getString(R.string.success);
String id = result.cast(GraphObjectWithId.class).getId();
alertMessage = getString(R.string.successfully_posted_post,
message, id);
} else {
title = getString(R.string.error);
alertMessage = error.getErrorMessage();
}
new AlertDialog.Builder(this).setTitle(title).setMessage(alertMessage)
.setPositiveButton(R.string.ok, null).show();
}
// create sample post to update on facebook
private FacebookDialog.ShareDialogBuilder createShareDialogBuilderForLink() {
return new FacebookDialog.ShareDialogBuilder(this)
.setName("Hello Facebook")
.setDescription("this is sample post from androidSRC.net to demonstrate facebook login in your android application")
.setLink("http://androidsrc.net/");
}
private void postStatusUpdate() {
if (canPresentShareDialog) {
FacebookDialog shareDialog = createShareDialogBuilderForLink().build();
uiHelper.trackPendingDialogCall(shareDialog.present());
} else if (user != null && hasPublishPermission()) {
final String message = getString(R.string.status_update,
user.getFirstName(), (new Date().toString()));
Request request = Request.newStatusUpdateRequest(
Session.getActiveSession(), message, place, tags,
new Request.Callback() {
@Override
public void onCompleted(Response response) {
showPublishResult(message,
response.getGraphObject(),
response.getError());
}
});
request.executeAsync();
} else {
pendingAction = PendingAction.POST_STATUS_UPDATE;
}
}
//check if app has permission to publish on facebook
private boolean hasPublishPermission() {
Session session = Session.getActiveSession();
return session != null && session.getPermissions().contains("publish_actions");
}
private void performPublish(PendingAction action, boolean allowNoSession) {
Session session = Session.getActiveSession();
if (session != null) {
pendingAction = action;
if (hasPublishPermission()) {
// We can do the action right away.
handlePendingAction();
return;
} else if (session.isOpened()) {
// We need to get new permissions, then complete the action when
// we get called back.
session.requestNewPublishPermissions(new Session.NewPermissionsRequest(
this, PERMISSION));
return;
}
}
if (allowNoSession) {
pendingAction = action;
handlePendingAction();
}
}
}
在logcat的提示錯誤。