Question

Usually, in order to launch a new Activity and get its result, from an Activity class, I will use

public void startActivityForResult (Intent intent, int requestCode)

However, what if I try to launch a new Activity and get its result, from a non-Activity class? How I can achieve this?

The reason I ask so as I am currently having LoginManager class (A non-Activity class). It is having the following code.

    accountManager.getAccountManager().getAuthToken(account, AUTH_TOKEN_TYPE, true, new AccountManagerCallback<Bundle>() {
        public void run(AccountManagerFuture<Bundle> future) {
            try {
                Bundle bundle = future.getResult();
                if (bundle.containsKey(AccountManager.KEY_INTENT)) {
                    Intent intent = bundle.getParcelable(AccountManager.KEY_INTENT);
                    intent.setFlags(intent.getFlags() & ~Intent.FLAG_ACTIVITY_NEW_TASK);
                    // Compilation error, as LoginManager doesn't have startActivityForResult method.
                    startActivityForResult(intent, REQUEST_AUTHENTICATE);

Answer 1

((Activity) mContext).startActivityForResult(.....) will do the trick.

But results will be delivered to the actual activity holding the context.

You can apply following Approach

Create single argument constructor in LoginManager class like follows.

class LoginManager
{
  private Context mContext; 
  LoginManager(Context mContext)
  {
    this.mContext=mContext;
  }
  .............................
  //Then whenever you want to call method call like this.

  ((Activity) mContext).startActivityForResult(.....)

}

Now in Activity class whenever you will create Object of LoginManager class create as follows.

LoginManager loginManager=new LoginManager(ActivityName.this);