Onstart() On Fragment Is Getting Called Twice In Android

I have an activity on which I have one fragment. In onStart() of fragment I have all network calls.When app comes from background onStart() is getting called twice and all network

Solution 1:

Try checking whether the fragment is already added before replacing

finalFragmentManagerfragmentManager= getSupportFragmentManager();
finalFragmentcontent= fragmentManager.findFragmentById(R.id.content_frame);
if (content == null || !(content instanceof MainFragment)) {
    finalFragmentTransactionfragmentTransaction= fragmentManager.beginTransaction();
    finalMainFragmentmyFragment=newMainFragment();
    fragmentTransaction.replace(R.id.content_frame, myFragment, "MyFragment");
    fragmentTransaction.commitAllowingStateLoss();
}

Solution 2:

commit or commitAllowingStateLoss is an asynchronous excute, so fragmentManager.findFragmentById(R.id.content_frame); will a null before first commit finished, that will cause replace called twice. you can debug onStart function, and see the hashCode of current Fragment object.

I replace commit to commitNow:

FragmentManagerfragmentManager= activity.getFragmentManager();
        FragmentlifeFragment= fragmentManager.findFragmentByTag(TAG_FRAGMENT);
        if (lifeFragment == null || !(lifeFragment instanceof LifeFragment)) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                fragmentManager.beginTransaction()
                        .add(newLifeFragment(), TAG_FRAGMENT)
                        .commitNowAllowingStateLoss();
            }else {
                fragmentManager.beginTransaction()
                        .add(newLifeFragment(), TAG_FRAGMENT)
                        .commitAllowingStateLoss();
            }
        }