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POgetSupportFragmentManager().findFragmentByTag unpredictable behaviour
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  1. POgetSupportFragmentManager().findFragmentByTag unpredictable behaviour
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    copied!<p>If I'm adding fragments to my activity like this:</p> <pre><code> fragment_tags = new ArrayList&lt;String&gt;(); fragment_tags.add("user_fragment"); fragment_tags.add("memorial_fragment"); UserFragment user = new UserFragment(); MemorialFragment memorial = new MemorialFragment(); FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); ft.add(R.id.content_frame, user, fragment_tags.get(0)); ft.add(R.id.content_frame, memorial, fragment_tags.get(1)); ft.commit(); </code></pre> <p>and then after some time I'm trying to retrieve these fragments like this:</p> <pre><code> List&lt;Fragment&gt; frg = getSupportFragmentManager().getFragments(); Fragment fragUser = getSupportFragmentManager().findFragmentByTag( "user_fragment"); Fragment fragUserID = getSupportFragmentManager().findFragmentById( R.id.user_fragment_id); Log.d("MV", "fragments size:" + (frg == null ? " null" : frg.size())); </code></pre> <p>Log.d will always return size of 2, but fragUser is sometimes null and sometimes it's the fragment I put in transaction.</p> <p>Which is more interesting is that this code:</p> <pre><code> try { Log.d("MV", "0:" + frg.get(0).toString()); Log.d("MV", "1:" + frg.get(1).toString()); } catch (NullPointerException e) { Log.d("MV", "null caught"); } </code></pre> <p>will sometimes work for both fragments and sometimes just for the first and if i do smething like this: </p> <pre><code>if(frg.get(0) == fragUser) </code></pre> <p>it will be sometimes evaluated as true, but not often.. I don't really understand this behaviour, but I need to implement switching between multiple fragments, so I need to get reference to exact fragment. Anybody? I'm trying to solve this for 6 hours now and I really dont understand how to do this. Thank you</p>
 

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