Comments (6)
check it, thanks. Forgot about it in ASNETutorial app.
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This looks to be a bug in ASNE rather than just the tutorial. This same exception also occurs when replacing fragments in an activity. For example, say I have a home activity that can open either a login fragment or a signup fragment. If I open the signup fragment, press back, then go to the login fragment, any requestLogin() call will cause the same null pointer.
If it is any help, I've verified this behavior doesn't occur using the Android Social Networks library ASNE was based off.
from asne.
@ITurchenko Here is a workaround that may help for the time being. This worked for me.
Fragment fragment = getSupportFragmentManager().findFragmentByTag(SOCIAL_NETWORK_TAG);
if(fragment != null) {
getSupportFragmentManager().beginTransaction().remove(fragment).commit();
getSupportFragmentManager().executePendingTransactions();
}
On your orientation change, remove the old asne fragment and create a new one. executePendingTransactions() must be used to make sure the old one is removed before the new created.
Hope this helps.
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I think the issue is the way that the context is passed.
FacebookSocialNetwork fbNetwork = new FacebookSocialNetwork(this, fbScope);
mSocialNetworkManager.addSocialNetwork(fbNetwork);
On orientation changed or a replaced fragment, the original "this" fragment context that is passed is stale.
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Is this bug already fixed?
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I found another way to avoid crash and memory leaks (use this code in your fragment):
...
private SocialNetworkManager snm;
...
@Override
public void onResume() {
super.onResume();
if (null == snm || snm.getInitializedSocialNetworks().isEmpty()) initSocialManager();
}
@Override
public void onPause() {
super.onPause();
if (isRemoving() || getActivity().isFinishing()/* or check for change rotation event*/) {
if (null != snm && snm.isAdded()) getFragmentManager().beginTransaction().remove(snm).commit();
snm = null;
}
}
...
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