我最近实施了Google+ API。我设法成功验证并继续前进到主要活动。我的问题是我想在操作栏菜单中包含一个“LogOut”选项，当用户回来时，系统会提示他再次登录。
我读了几个答案但是我无法实现它们。
您能否建议实施此解决方案的最佳方式并提出一个好的示例？
谢谢，
答案 0 :(得分：1)
所以我设法解决了这个问题，我创建了下面的基类，并在所需的活动中继承了它，我测试了它并按预期工作。对于需要了解如何构建它的人，您可以使用以下代码。
关于主要登录活动的两点，您需要根据点击事件更改标志状态。
如果您想在其他活动中从G +帐户退出，请务必先启动GoogleApiClient，否则您将获得null对象引用异常。
希望能帮到某人......
public class BaseClass extends AppCompatActivity implements
GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener{
/* Request code used to invoke sign in user interactions. */
private static final int RC_SIGN_IN = 0;
protected GoogleApiClient mGoogleApiClient;
protected Context mContext;
/* "mIntentInProgress" is A flag indicating that a PendingIntent is in progress and prevents
* us from starting further intents.
* True if we are in the process of resolving a ConnectionResult
* "mSignInClicked" FLAG is True if the sign-in button was clicked. When true, we know to resolve all
* issues preventing sign-in without waiting.
*/
public boolean mIntentInProgress;
public boolean mSignInClicked;
public String mPersonName;
public String mImageUrl;
public String mEmailAddress;
public BaseClass(){
}
public void CreateClient(Context mContext){
//Client builder that return GoogleAPI client, make the connection from the app to the G+ service
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)//add OnConnected and OnConnectionSuspended methods to control the connection state
.addOnConnectionFailedListener(this) // add OnConnectionFaild listener in case connection was failed.
.addApi(Plus.API)
.addScope(Plus.SCOPE_PLUS_PROFILE)//profile permission from the user
.addScope(Plus.SCOPE_PLUS_LOGIN)// login details from the user
.build();
mGoogleApiClient.connect();
}
@Override
public void onConnected(Bundle bundle) {
Log.i("google base class", "onConnected invoked");
try {
if (Plus.PeopleApi.getCurrentPerson(mGoogleApiClient) != null) {
Person currentPerson = Plus.PeopleApi.getCurrentPerson(mGoogleApiClient);
mPersonName= currentPerson.getDisplayName();
mImageUrl=currentPerson.getImage().getUrl();
mEmailAddress = Plus.AccountApi.getAccountName(mGoogleApiClient);
}
} catch (Exception e) {
e.printStackTrace();
} }
@Override
public void onConnectionSuspended(int i) {
Log.i("google base class", "onConnectionSuspended invoked");
mGoogleApiClient.connect();
}
@Override
public void onConnectionFailed(ConnectionResult result) {
Log.i("google base class", "onConnectionFailed invoked");
if (!mIntentInProgress) {
if (mSignInClicked && result.hasResolution()) {
// The user has already clicked 'sign-in' so we attempt to resolve all
// errors until the user is signed in, or they cancel.
try {
result.startResolutionForResult(this, RC_SIGN_IN);
mIntentInProgress = true;
} catch (IntentSender.SendIntentException e) {
// The intent was canceled before it was sent. Return to the default
// state and attempt to connect to get an updated ConnectionResult.
mIntentInProgress = false;
mGoogleApiClient.connect();
}
}
}
}
public void onLogout() {
Log.i("base class", "logout invoked");
if (mGoogleApiClient.isConnected()) {
Log.i("base class", "logout invoked");
Plus.AccountApi.clearDefaultAccount(mGoogleApiClient);
mGoogleApiClient.disconnect();
mGoogleApiClient.connect();
}
}
/**
* Revoking access from google
* */
public void revokeGplusAccess() {
if (mGoogleApiClient.isConnected()) {
Plus.AccountApi.clearDefaultAccount(mGoogleApiClient);
Plus.AccountApi.revokeAccessAndDisconnect(mGoogleApiClient)
.setResultCallback(new ResultCallback<Status>() {
@Override
public void onResult(Status arg0) {
Log.e("base class", "User access revoked!");
mGoogleApiClient.connect();
}
});
}
}
}
答案 1 :(得分：1)
在公共类中定义GoogleApiClient，然后可以通过任何其他类检索
public class UserSessionManager implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
// Context
private Context _context;
// Google plus Client
public GoogleApiClient mGoogleApiClient;
// Constructor
public UserSessionManager(Context context){
this._context = context;
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestEmail()
.build();
mGoogleApiClient = new GoogleApiClient.Builder(_context)
.addApi(Auth.GOOGLE_SIGN_IN_API, gso)
.addConnectionCallbacks(this).build();
mGoogleApiClient.connect();
}
@Override
public void onConnected(Bundle bundle) {
Log.i("google base class", "onConnected invoked");
}
@Override
public void onConnectionSuspended(int i) {
Log.i("google base class", "onConnectionSuspended invoked");
mGoogleApiClient.connect();
}
@Override
public void onConnectionFailed(ConnectionResult result) {
Log.i("google base class", "onConnectionFailed invoked");
}
}
只需像往常一样使用mGoogleApiClient，例如：
在LoginActivity中......
UserSessionManager session = new UserSessionManager(getApplicationContext());
private void googleSignIn() {
Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(session.mGoogleApiClient);
startActivityForResult(signInIntent, application.TAG_RESULTLOGINGOOGLE);
}
在LogoutActivity中
UserSessionManager session = new UserSessionManager(getApplicationContext());
private void googleLogOut() {
Auth.GoogleSignInApi.signOut(session.mGoogleApiClient).setResultCallback(
new ResultCallback<Status>() {
@Override
public void onResult(Status status) {
Toast.makeText(_context, "G+ loggedOut", Toast.LENGTH_SHORT).show();
}
});
}
答案 2 :(得分：-1)
尝试将此代码放入您自己的按钮或您想要的任何事件中。
if (mGoogleApiClient.isConnected()) {
Plus.AccountApi.clearDefaultAccount(mGoogleApiClient);
mGoogleApiClient.disconnect();
mGoogleApiClient.connect();
}