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POcwac Endless Fragment Demo Issue - Using Within My Own Fragment Format
 

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    <p>I have a basic working app generated by using the ADT wizard. As a result I have a basic fragment format (1 ) which I have been using.</p> <p>I want to take the demo code (2) and use it how ever if I take the fragment example as is the application crashes and the logcat shows the fragment as the fault.</p> <p>I have tried to take the code from (1) and (2) to create (3) how ever multiple errors occur. After so looking I believe that the issue is with "DemoAdapter adapter=null;" because for what ever reason "class DemoAdapter extends EndlessAdapter implements IItemsReadyListener" is not visible to call.</p> <p>T</p> <p>(1)My basic fragment - Which works</p> <pre><code>import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class Fragment2 extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View root = inflater.inflate(R.layout.fragment_dod_events, container, false); // Do Stuff Here return root; } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); // Save some state! } } </code></pre> <p>(2)The Endless Demo - No Errors but crashes my app if I use as is....</p> <pre><code>package com.commonsware.cwac.endless.demo; import android.app.ListFragment; import android.os.AsyncTask; import android.os.Bundle; import android.os.SystemClock; import android.view.View; import android.view.ViewGroup; import android.view.animation.Animation; import android.view.animation.RotateAnimation; import android.widget.ArrayAdapter; import java.util.ArrayList; import com.commonsware.cwac.endless.EndlessAdapter; /** * This example makes use of EndlessAdapter's * setRunInBackground feature. * * Calling setRunInBackground(false) allows you to launch * your own AsyncTask with a listener callback, rather than * using the built in cacheInBackground functionality. * * This is useful if you have existing AsyncTask(s) written * to fetch data in a background thread, and don't want * EndlessAdapter launching that in yet another background * thread. */ public class EndlessAdapterCustomTaskFragment extends ListFragment { DemoAdapter adapter=null; ArrayList&lt;Integer&gt; items=null; @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); setRetainInstance(true); if (adapter == null) { items=new ArrayList&lt;Integer&gt;(); for (int i=0; i &lt; 25; i++) { items.add(i); } adapter=new DemoAdapter(items); adapter.setRunInBackground(false); // Tell the adapter // we will handle // starting the // background task } setListAdapter(adapter); } class DemoAdapter extends EndlessAdapter implements IItemsReadyListener { private RotateAnimation rotate=null; DemoAdapter(ArrayList&lt;Integer&gt; list) { super(new ArrayAdapter&lt;Integer&gt;(getActivity(), R.layout.row, android.R.id.text1, list)); rotate= new RotateAnimation(0f, 360f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); rotate.setDuration(600); rotate.setRepeatMode(Animation.RESTART); rotate.setRepeatCount(Animation.INFINITE); } @Override protected View getPendingView(ViewGroup parent) { View row= getActivity().getLayoutInflater().inflate(R.layout.row, null); View child=row.findViewById(android.R.id.text1); child.setVisibility(View.GONE); child=row.findViewById(R.id.throbber); child.setVisibility(View.VISIBLE); child.startAnimation(rotate); return(row); } @Override protected boolean cacheInBackground() throws Exception { new FetchDataTask(this, items.size()).execute(); return(items.size()&lt;75); } @Override public void onItemsReady(ArrayList&lt;Integer&gt; data) { items.addAll(data); adapter.onDataReady(); // Tell the EndlessAdapter to // remove it's pending // view and call // notifyDataSetChanged() } @Override protected void appendCachedData() { } } interface IItemsReadyListener { public void onItemsReady(ArrayList&lt;Integer&gt; data); } class FetchDataTask extends AsyncTask&lt;Void, Void, ArrayList&lt;Integer&gt;&gt; { IItemsReadyListener listener; /* * The point from where to start counting. In a real * life scenario this could be a pagination number */ int startPoint; protected FetchDataTask(IItemsReadyListener listener, int startPoint) { this.listener=listener; this.startPoint=startPoint; } @Override protected ArrayList&lt;Integer&gt; doInBackground(Void... params) { ArrayList&lt;Integer&gt; result=new ArrayList&lt;Integer&gt;(); SystemClock.sleep(3000); // pretend to do work for (int i=startPoint; i &lt; startPoint + 25; i++) { result.add(i); } return(result); } @Override protected void onPostExecute(ArrayList&lt;Integer&gt; result) { listener.onItemsReady(result); } } } </code></pre> <p>(3)My new fragment using both the above which does not work.</p> <pre><code>import java.util.ArrayList; import android.os.AsyncTask; import android.os.Bundle; import android.os.SystemClock; import android.support.v4.app.Fragment; import android.support.v4.app.ListFragment; import android.support.v4.app.DialogFragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentTransaction; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.animation.Animation; import android.view.animation.RotateAnimation; import android.widget.ArrayAdapter; import com.commonsware.cwac.endless.EndlessAdapter; public class Fragment2 extends ListFragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View root = inflater.inflate(R.layout.fragment_dod_events, container, false); DemoAdapter adapter=null; ArrayList&lt;Integer&gt; items=null; @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); setRetainInstance(true); if (adapter == null) { items=new ArrayList&lt;Integer&gt;(); for (int i=0; i &lt; 25; i++) { items.add(i); } adapter=new DemoAdapter(items); adapter.setRunInBackground(false); // Tell the adapter // we will handle // starting the // background task } setListAdapter(adapter); } class DemoAdapter extends EndlessAdapter implements IItemsReadyListener { private RotateAnimation rotate=null; DemoAdapter(ArrayList&lt;Integer&gt; list) { super(new ArrayAdapter&lt;Integer&gt;(getActivity(), R.layout.row, android.R.id.text1, list)); rotate= new RotateAnimation(0f, 360f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); rotate.setDuration(600); rotate.setRepeatMode(Animation.RESTART); rotate.setRepeatCount(Animation.INFINITE); } @Override protected View getPendingView(ViewGroup parent) { View row= getActivity().getLayoutInflater().inflate(R.layout.row, null); View child=row.findViewById(android.R.id.text1); child.setVisibility(View.GONE); child=row.findViewById(R.id.throbber); child.setVisibility(View.VISIBLE); child.startAnimation(rotate); return(row); } @Override protected boolean cacheInBackground() throws Exception { new FetchDataTask(this, items.size()).execute(); return(items.size()&lt;75); } @Override public void onItemsReady(ArrayList&lt;Integer&gt; data) { items.addAll(data); adapter.onDataReady(); // Tell the EndlessAdapter to // remove it's pending // view and call // notifyDataSetChanged() } @Override protected void appendCachedData() { } } interface IItemsReadyListener { public void onItemsReady(ArrayList&lt;Integer&gt; data); } class FetchDataTask extends AsyncTask&lt;Void, Void, ArrayList&lt;Integer&gt;&gt; { IItemsReadyListener listener; /* * The point from where to start counting. In a real * life scenario this could be a pagination number */ int startPoint; protected FetchDataTask(IItemsReadyListener listener, int startPoint) { this.listener=listener; this.startPoint=startPoint; } @Override protected ArrayList&lt;Integer&gt; doInBackground(Void... params) { ArrayList&lt;Integer&gt; result=new ArrayList&lt;Integer&gt;(); SystemClock.sleep(3000); // pretend to do work for (int i=startPoint; i &lt; startPoint + 25; i++) { result.add(i); } return(result); } @Override protected void onPostExecute(ArrayList&lt;Integer&gt; result) { listener.onItemsReady(result); } } // Do Stuff Here return root; } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); // Save some state! } </code></pre>
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