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POandroid: Handle events of AlertDialog components in Parent Activity
 

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  1. POandroid: Handle events of AlertDialog components in Parent Activity
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    <p>In my app I have a scene where I need to show listView with title in many situations. </p> <p>So I created a gen_list_layout.xml with a TextView &amp; a ListView in it.</p> <p>Now to show the list, I planned to create a method "public static AlertDialog createAlertDialog(String title, String[] items, Activity activity)" where I can create teh AlertDialog for the same.</p> <pre><code> public AlertDialog createAlertDialog(Activity act, String title, String[] items) { LayoutInflater layoutInflater = (LayoutInflater)this.getSystemService(Context.LAYOUT_INFLATER_SERVICE); View view = layoutInflater.inflate(R.layout.gen_list_layout,null); TextView titleTv = (TextView) view.findViewById(R.id.genListTitTv); titleTv.setText(title); ArrayAdapter&lt;String&gt; ad = new ArrayAdapter&lt;String&gt;(this, R.layout.list_item, R.id.genList, items); ListView listView = (ListView) findViewById(R.id.genList); listView.setAdapter(ad); listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE); // I WANT THIS TO BE HNDLED IN THE ACTIVITY CALLING listView.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView&lt;?&gt; arg0, View v, int position, long id) { } }); AlertDialog.Builder scrnDlg = new AlertDialog.Builder(act); scrnDlg.setView(view); final AlertDialog adg = scrnDlg.create(); return adg; } </code></pre> <p>I will call the createAlertDialog(), from different Activity wherever I need the list.</p> <pre><code> AlertDialog ad = Components.createAlertDialog(RouteListActivity.this, title, items); </code></pre> <p>Now how do I handle click events for the ListView that is in AlertDialog ??</p> <p>Any clue, how to implement such.</p> <p><strong>UPDATE</strong> I update my Q after implementing your approach &amp; I see an exception. Can't get teh cause of the exception. I created a class and added createAlertDialog :</p> <pre><code>public class ListAlertDialog { public AlertDialog createAlertDialog(Activity act, String title, String[] items, OnItemClickListener clickListener) { Log.i("ListAD", "Start to create Alert Dialog"); LayoutInflater layoutInflater = (LayoutInflater)act.getSystemService(Context.LAYOUT_INFLATER_SERVICE); View view = layoutInflater.inflate(R.layout.gen_list_layout, null); Log.i("ListAD", "Got View :" + view.getId()); TextView titleTv = (TextView) view.findViewById(R.id.genListTitTv); titleTv.setText(title); Log.i("ListAD", "Set Title TV : " + titleTv.getId()); ArrayAdapter&lt;String&gt; ad = new ArrayAdapter&lt;String&gt;(act, R.layout.list_item, R.id.genList, items); Log.i("ListAD", "Created Adapter"); ListView listView = (ListView) view.findViewById(R.id.genList); listView.setAdapter(ad); listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE); Log.i("ListAD", "Got ListView :" + listView.getId() + " &amp; Set Adapter"); listView.setOnItemClickListener(clickListener); Log.i("ListAD", "Added Listerner to listView : " + clickListener.getClass()); AlertDialog.Builder scrnDlg = new AlertDialog.Builder(act); scrnDlg.setView(view); Log.i("ListAD", "Set View of scrnDlg"); final AlertDialog adg = scrnDlg.create(); Log.i("ListAD", "Created Alert Dialog &amp; returning it : " + adg ); return adg; } } </code></pre> <p>My gen_list.layout.xml file :</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"&gt; &lt;TextView android:id="@+id/genListTitTv" style="@style/inPageTitleStyle" android:text="" /&gt; &lt;ListView android:id="@+id/genList" android:layout_width="match_parent" android:layout_height="wrap_content" android:dividerHeight="0dp" android:divider="@null" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>In my Activity, I m calling as :</p> <pre><code> ListAlertDialog lad = new ListAlertDialog(); AlertDialog ad = lad.createAlertDialog(Mumbai77Activity.this, "Select", items, clickListener); Log.i(TAG, "Got the AD in Activity : " + ad + " ABT to Show"); ad.show(); Log.i(TAG, "Shown ad"); </code></pre> <p>The error that I get in logs is NullPointerException :</p> <pre><code>08-30 12:52:00.247: I/ListAD(366): Start to create Alert Dialog 08-30 12:52:00.257: I/ListAD(366): Got View :-1 08-30 12:52:00.257: I/ListAD(366): Set Title TV : 2131230764 08-30 12:52:00.257: I/ListAD(366): Created Adapter 08-30 12:52:00.257: I/ListAD(366): Got ListView :2131230765 &amp; Set Adapter 08-30 12:52:00.267: I/ListAD(366): Added Listerner to listView : class org.mumbai77.core.Mumbai77Activity$2 08-30 12:52:00.267: I/ListAD(366): Set View of scrnDlg 08-30 12:52:00.267: I/ListAD(366): Created Alert Dialog &amp; returning it : android.app.AlertDialog@44f29668 08-30 12:52:00.267: I/Mumbai77(366): Got the AD in Activity : android.app.AlertDialog@44f29668 ABT to Show 08-30 12:52:00.297: I/Mumbai77(366): Shown ad 08-30 12:52:00.417: D/AndroidRuntime(366): Shutting down VM 08-30 12:52:00.417: W/dalvikvm(366): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 08-30 12:52:00.437: E/AndroidRuntime(366): FATAL EXCEPTION: main 08-30 12:52:00.437: E/AndroidRuntime(366): java.lang.NullPointerException 08-30 12:52:00.437: E/AndroidRuntime(366): at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:353) 08-30 12:52:00.437: E/AndroidRuntime(366): at android.widget.ArrayAdapter.getView(ArrayAdapter.java:323) 08-30 12:52:00.437: E/AndroidRuntime(366): at android.widget.AbsListView.obtainView(AbsListView.java:1315) 08-30 12:52:00.437: E/AndroidRuntime(366): at android.widget.ListView.measureHeightOfChildren(ListView.java:1198) 08-30 12:52:00.437: E/AndroidRuntime(366): at android.widget.ListView.onMeasure(ListView.java:1109) 08-30 12:52:00.437: E/AndroidRuntime(366): at android.view.View.measure(View.java:8171) 08-30 12:52:00.437: E/AndroidRuntime(366): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 08-30 12:52:00.437: E/AndroidRuntime(366): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1012) 08-30 12:52:00.437: E/AndroidRuntime(366): at android.widget.LinearLayout.measureVertical(LinearLayout.java:381) 08-30 12:52:00.437: E/AndroidRuntime(366): at android.widget.LinearLayout.onMeasure(LinearLayout.java:304) 08-30 12:52:00.437: E/AndroidRuntime(366): at android.view.View.measure(View.java:8171) 08-30 12:52:00.437: E/AndroidRuntime(366): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 08-30 12:52:00.437: E/AndroidRuntime(366): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 08-30 12:52:00.437: E/AndroidRuntime(366): at android.view.View.measure(View.java:8171) 08-30 12:52:00.437: E/AndroidRuntime(366): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) ................ </code></pre> <p>On looking at the exception, I can't get the actual problem, but on looking at the logs that I have added I can see that the Got View : -1 I beleive <code>View view = layoutInflater.inflate(R.layout.gen_list_layout, null);</code>has some problems. It is not able to get the view or somethign like that. </p> <p>Any idea what can be th problem with the View - why it is not getting the view of layout ? Any modifications to b done in the layout or the inflate() ?</p> <p>Any help is highly appreciated..</p> <p>Thanks</p>
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