Redirect activity after facebook login

问题

I'm using Android Facebook SDK (4.01) to login to my app with Facebook. The facebook login from my MainActivity succeeds and then I use Intent to procced to next activity. That part works.

After that in my new activity (MainLobby) I want to able to logout from facebook and return to my previous MainActivity, by pressing back button. For some reason when I press back the MainLobby closes, but has another MainLobby activity behind it. So I have to press back button twice to get back to MainActivity. Why is that?

Main Activity class code:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    FacebookSdk.sdkInitialize(getApplicationContext());
    setContentView(R.layout.main_activity);

    fbloginBT = (LoginButton) findViewById(R.id.fbloginBT);
    callback = CallbackManager.Factory.create();
    fbloginBT.registerCallback(callback, new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {
            System.out.println("onSuccess");
            Intent mainLobby = new Intent(MainActivity.this, MainLobby.class);
            startActivity(mainLobby);
        }

        @Override
        public void onCancel() {
            System.out.println("onCancel");
        }

        @Override
        public void onError(FacebookException e) {
            System.out.println("onError");
        }
    });
    fbloginBT.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            LoginManager.getInstance().logInWithReadPermissions(MainActivity.this, Arrays.asList("public_profile"));
        }
    });

}


@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    callback.onActivityResult(requestCode, resultCode, data);
}

Main Lobby class code:

@Override
public void onBackPressed() {
    if (mDrawerLayout.isDrawerOpen(Gravity.LEFT))
        mDrawerLayout.closeDrawer(Gravity.LEFT);
    else if (searchView.isShown() && !isClosed){
        searchView.onActionViewCollapsed();  //collapse your ActionView
        searchView.setQuery("", false);       //clears your query without submit
        isClosed = true;
    }
    else {
        LoginManager.getInstance().logOut();
        super.onBackPressed();
    }
}

UPDATE:

I works correct on emulator, in Android Studio. It works as described above when I test it on an Android phone device.

回答1:

Try this :

private boolean isMainLobbyStarted = false;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    FacebookSdk.sdkInitialize(getApplicationContext());
    setContentView(R.layout.main_activity);

    fbloginBT = (LoginButton) findViewById(R.id.fbloginBT);
    callback = CallbackManager.Factory.create();
    fbloginBT.registerCallback(callback, new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {
            System.out.println("onSuccess");
            Intent mainLobby = new Intent(MainActivity.this, MainLobby.class);
            if(!isMainLobbyStarted) {
                startActivity(mainLobby);
                isMainLobbeyStarted = true;
            }
        }

        @Override
        public void onCancel() {
            System.out.println("onCancel");
        }

        @Override
        public void onError(FacebookException e) {
            System.out.println("onError");
        }
    });
    fbloginBT.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            LoginManager.getInstance().logInWithReadPermissions(MainActivity.this, Arrays.asList("public_profile"));
        }
    });

}


@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    callback.onActivityResult(requestCode, resultCode, data);
}

回答2:

Update your code as follows and try ,

@Override
public void onBackPressed() {
if (mDrawerLayout.isDrawerOpen(Gravity.LEFT))
    mDrawerLayout.closeDrawer(Gravity.LEFT);
else if (searchView.isShown() && !isClosed){
    searchView.onActionViewCollapsed();  //collapse your ActionView
    searchView.setQuery("", false);       //clears your query without submit
    isClosed = true;
}

LoginManager.getInstance().logOut();
super.onBackPressed();

}

来源：https://stackoverflow.com/questions/29805604/redirect-activity-after-facebook-login

标签

android

android-activity

facebook-login