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POUpdate Listview in from other fragment
 

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    <p>I am using the tutorial on <a href="http://manishkpr.webheavens.com/android-viewpager-example/" rel="nofollow">Manishkpr</a> to create a app where you swipe between 1) layoutOne: here you create a file and 2) layoutTwo: shows a listview of all created files in a certain folder.</p> <p>Problem: if you create a file, it is not immediately shown in the listview. I found that I should use this code in my LayoutOne.java:</p> <pre><code> LayoutTwo fragment = (LayoutTwo) getFragmentManager().findFragmentByTag("TESTTWO"); fragment.getAdapter().notifyDataSetChanged(); </code></pre> <p>In LayoutTwo.java I added: </p> <pre><code>private static final String TAG = "TESTTWO"; //and the function getAdapter: public CustomArrayAdapter getAdapter() { return adapter; } </code></pre> <p>However, I am getting a nullpointer exception on <code>fragment.getAdapter().notifyDataSetChanged();</code>. How can I solve this, and is this the best way actually?</p> <p><strong>EDIT</strong></p> <pre><code>myList = new ArrayList&lt;RecordedFile&gt;(); File directory = Environment.getExternalStorageDirectory(); file = new File(directory + "/test/"); File list[] = file.listFiles(); for (int i = 0; i &lt; list.length; i++) { if (checkExtension(list[i].getName()) == true) { RecordedFile q = new RecordedFile(); q.setTitle(list[i].getName()); q.setFileSize(readableFileSize(list[i].length())); myList.add(q); } } adapter = new CustomArrayAdapter(myContext, R.layout.listview_item_row, myList); listView.setAdapter(adapter); </code></pre>
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