问题
I am using Google plus login in my android app its Working Fine.
While Clicking logout Button from any other intent Showing Null pointer Exception.
also While click login button directly going to my next page .not in sign in page.
but Logout from Demo Application Its working fine.
I Have searched related answers ,Not found any solution still remain same.
help me to resolve it
link 1
link 2
I have referred 2 links but sign out from next intent still showing the Null pointer Exception.
My Logout Code:
public void googlePlusLogout()
{
if (mGoogleApiClient.isConnected())
{
Plus.AccountApi.clearDefaultAccount(mGoogleApiClient);
mGoogleApiClient.disconnect();
mGoogleApiClient.connect();
updateProfile(false);
}
}
here calling the method from other intent to signin class
otherintent.java
session.logoutUser();// here i am clearing the shared pref
sign_in Signinclass = new sign_in();
Signinclass.googlePlusLogout();
finish();
This is my demo code its working fine Same Code I Have used in my Application Login working fine ,but Logout calling from another page not working. Showing null pointer exception.
AndroidGooglePlusExample .java
public class AndroidGooglePlusExample extends Activity implements OnClickListener, ConnectionCallbacks, OnConnectionFailedListener {
private static final int RC_SIGN_IN = 0;
// Google client to communicate with Google
private GoogleApiClient mGoogleApiClient;
private boolean mIntentInProgress;
private boolean signedInUser;
private ConnectionResult mConnectionResult;
private SignInButton signinButton;
private ImageView image;
private TextView username, emailLabel;
private LinearLayout profileFrame, signinFrame;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
signinButton = (SignInButton) findViewById(R.id.signin);
signinButton.setOnClickListener(this);
image = (ImageView) findViewById(R.id.image);
username = (TextView) findViewById(R.id.username);
emailLabel = (TextView) findViewById(R.id.email);
profileFrame = (LinearLayout) findViewById(R.id.profileFrame);
signinFrame = (LinearLayout) findViewById(R.id.signinFrame);
mGoogleApiClient = new GoogleApiClient.Builder(this).addConnectionCallbacks(this).addOnConnectionFailedListener(this).addApi(Plus.API, Plus.PlusOptions.builder().build()).addScope(Plus.SCOPE_PLUS_LOGIN).build();
}
protected void onStart() {
super.onStart();
mGoogleApiClient.connect();
}
protected void onStop() {
super.onStop();
if (mGoogleApiClient.isConnected()) {
mGoogleApiClient.disconnect();
}
}
private void resolveSignInError() {
if (mConnectionResult.hasResolution()) {
try {
mIntentInProgress = true;
mConnectionResult.startResolutionForResult(this, RC_SIGN_IN);
} catch (SendIntentException e) {
mIntentInProgress = false;
mGoogleApiClient.connect();
}
}
}
@Override
public void onConnectionFailed(ConnectionResult result) {
if (!result.hasResolution()) {
GooglePlayServicesUtil.getErrorDialog(result.getErrorCode(), this, 0).show();
return;
}
if (!mIntentInProgress) {
// store mConnectionResult
mConnectionResult = result;
if (signedInUser) {
resolveSignInError();
}
}
}
@Override
protected void onActivityResult(int requestCode, int responseCode, Intent intent) {
switch (requestCode) {
case RC_SIGN_IN:
if (responseCode == RESULT_OK) {
signedInUser = false;
}
mIntentInProgress = false;
if (!mGoogleApiClient.isConnecting()) {
mGoogleApiClient.connect();
}
break;
}
}
@Override
public void onConnected(Bundle arg0) {
signedInUser = false;
Toast.makeText(this, "Connected", Toast.LENGTH_LONG).show();
getProfileInformation();
}
private void updateProfile(boolean isSignedIn) {
if (isSignedIn) {
signinFrame.setVisibility(View.GONE);
profileFrame.setVisibility(View.VISIBLE);
} else {
signinFrame.setVisibility(View.VISIBLE);
profileFrame.setVisibility(View.GONE);
}
}
private void getProfileInformation() {
try {
if (Plus.PeopleApi.getCurrentPerson(mGoogleApiClient) != null) {
Person currentPerson = Plus.PeopleApi.getCurrentPerson(mGoogleApiClient);
String personName = currentPerson.getDisplayName();
String personPhotoUrl = currentPerson.getImage().getUrl();
String email = Plus.AccountApi.getAccountName(mGoogleApiClient);
username.setText(personName);
emailLabel.setText(email);
new LoadProfileImage(image).execute(personPhotoUrl);
// update profile frame with new info about Google Account
// profile
updateProfile(true);
}
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void onConnectionSuspended(int cause) {
mGoogleApiClient.connect();
updateProfile(false);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.signin:
googlePlusLogin();
break;
}
}
public void signIn(View v) {
googlePlusLogin();
}
public void logout(View v) {
googlePlusLogout();
}
private void googlePlusLogin() {
if (!mGoogleApiClient.isConnecting()) {
signedInUser = true;
resolveSignInError();
}
}
private void googlePlusLogout() {
if (mGoogleApiClient.isConnected()) {
Plus.AccountApi.clearDefaultAccount(mGoogleApiClient);
mGoogleApiClient.disconnect();
mGoogleApiClient.connect();
updateProfile(false);
}
}
// download Google Account profile image, to complete profile
private class LoadProfileImage extends AsyncTask<String, Void, Bitmap> {
ImageView downloadedImage;
public LoadProfileImage(ImageView image) {
this.downloadedImage = image;
}
protected Bitmap doInBackground(String... urls) {
String url = urls[0];
Bitmap icon = null;
try {
InputStream in = new java.net.URL(url).openStream();
icon = BitmapFactory.decodeStream(in);
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return icon;
}
protected void onPostExecute(Bitmap result) {
downloadedImage.setImageBitmap(result);
}
}
回答1:
I found the Solution for my Question
Add this Code in your Logout activity page. Its works perfectly
My Logout page activity
public class LogoutActivity extends Activity implements OnClickListener,
ConnectionCallbacks, OnConnectionFailedListener,
ResultCallback<People.LoadPeopleResult> {
GoogleApiClient mGoogleApiClient;
boolean mSignInClicked;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this).addApi(Plus.API)
.addScope(Plus.SCOPE_PLUS_LOGIN).build();
//copy this code on "Logout" Onclick
logout.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (mGoogleApiClient.isConnected()) {
Plus.AccountApi.clearDefaultAccount(mGoogleApiClient);
mGoogleApiClient.disconnect();
mGoogleApiClient.connect();
// updateUI(false);
System.err.println("LOG OUT ^^^^^^^^^^^^^^^^^^^^ SUCESS");
}
}
});
}
@Override
public void onConnected(Bundle arg0) {
// TODO Auto-generated method stub
mSignInClicked = false;
// updateUI(true);
Plus.PeopleApi.loadVisible(mGoogleApiClient, null).setResultCallback(
this);
}
@Override
public void onConnectionSuspended(int arg0) {
// TODO Auto-generated method stub
mGoogleApiClient.connect();
// updateUI(false);
}
@Override
public void onConnectionFailed(ConnectionResult arg0) {
// TODO Auto-generated method stub
}
protected void onStart() {
super.onStart();
mGoogleApiClient.connect();
}
protected void onStop() {
super.onStop();
if (mGoogleApiClient.isConnected()) {
mGoogleApiClient.disconnect();
}
}
@Override
public void onResult(LoadPeopleResult arg0) {
// TODO Auto-generated method stub
}
link for reference
来源：https://stackoverflow.com/questions/30731498/sign-out-from-google-plus-account-not-working-in-android-showing-null-pointer-e