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POHandling orientation changes with dynamic spinners
 

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  1. POHandling orientation changes with dynamic spinners
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    <p>I have searched the web and keep trying for 5 hours but I couldn't find a way to solve the problem. I want to keep the state of my spinners after orientation changes.</p> <p>I have 2 spinners which are created dynamically. They get their items by http request and the first spinner changes the items in the second one by setOnItemSelectedListener() method. I read the Strings into Global Lists.</p> <pre><code>public class Global { public static String userName; public static String userType; public static String serverIp; public static int spinnerLeaguePos=0; public static int spinnerMatchPos=0; public static List&lt;String&gt; leagues; public static List&lt;String&gt; matches; } </code></pre> <p>My first problem was preventing the activity from restart.</p> <pre><code>android:configChanges="orientation|keyboardHidden" </code></pre> <p>I have made this change in my manifest file to handle orientation changes by myself and avoid activity from restart.</p> <p>I have found a way for handling orientation changes on internet but it doesn't worked for me. I'm getting null pointer exception when I change the orientation.</p> <pre><code>07-05 12:41:08.119: E/AndroidRuntime(26388): FATAL EXCEPTION: main 07-05 12:41:08.119: E/AndroidRuntime(26388): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example/com.example.MatchSelectionActivity}: java.lang.NullPointerException 07-05 12:41:08.119: E/AndroidRuntime(26388): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956) 07-05 12:41:08.119: E/AndroidRuntime(26388): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 07-05 12:41:08.119: E/AndroidRuntime(26388): at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3351) 07-05 12:41:08.119: E/AndroidRuntime(26388): at android.app.ActivityThread.access$700(ActivityThread.java:123) 07-05 12:41:08.119: E/AndroidRuntime(26388): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1151) 07-05 12:41:08.119: E/AndroidRuntime(26388): at android.os.Handler.dispatchMessage(Handler.java:99) 07-05 12:41:08.119: E/AndroidRuntime(26388): at android.os.Looper.loop(Looper.java:137) 07-05 12:41:08.119: E/AndroidRuntime(26388): at android.app.ActivityThread.main(ActivityThread.java:4424) 07-05 12:41:08.119: E/AndroidRuntime(26388): at java.lang.reflect.Method.invokeNative(Native Method) 07-05 12:41:08.119: E/AndroidRuntime(26388): at java.lang.reflect.Method.invoke(Method.java:511) 07-05 12:41:08.119: E/AndroidRuntime(26388): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 07-05 12:41:08.119: E/AndroidRuntime(26388): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 07-05 12:41:08.119: E/AndroidRuntime(26388): at dalvik.system.NativeStart.main(Native Method) 07-05 12:41:08.119: E/AndroidRuntime(26388): Caused by: java.lang.NullPointerException 07-05 12:41:08.119: E/AndroidRuntime(26388): at com.example.MatchSelectionActivity.setLeagues(MatchSelectionActivity.java:90) 07-05 12:41:08.119: E/AndroidRuntime(26388): at com.example.MatchSelectionActivity.onCreate(MatchSelectionActivity.java:47) 07-05 12:41:08.119: E/AndroidRuntime(26388): at android.app.Activity.performCreate(Activity.java:4465) 07-05 12:41:08.119: E/AndroidRuntime(26388): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 07-05 12:41:08.119: E/AndroidRuntime(26388): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 07-05 12:41:08.119: E/AndroidRuntime(26388): ... 12 more </code></pre> <p>This is what I have done so far. I don't even sure about to way I'm trying to do it. So any more appropriate way for doing this will be appreciated.</p> <pre><code>@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); spinnerLeague = (Spinner) findViewById(R.id.spinner_league); spinnerMatch = (Spinner) findViewById(R.id.spinner_match); if (savedInstanceState != null) { setLeagues(); setMatches(); spinnerLeague.setSelection(Global.spinnerLeaguePos); spinnerMatch.setSelection(Global.spinnerMatchPos); } else{ Global.leagues = new ArrayList&lt;String&gt;(); Global.matches = new ArrayList&lt;String&gt;(); Global.leagues.add(getString(R.string.league_select)); Global.matches.add(getString(R.string.match_select)); GetLeagues task = new GetLeagues(); String requestString = "http://" + Global.serverIp + ":8080/server/GetCurrentLeagues"; task.execute(new String[] { requestString }); } setContentView(R.layout.match_selection_layout); } public class GetLeagues extends AsyncTask&lt;String, Void, String[]&gt; { @Override protected String[] doInBackground(String... urls) { //this part works properly, and reads the leagues into Global.leagues List } @Override protected void onPostExecute(String[] result) { setLeagues(); } } public class GetMatches extends AsyncTask&lt;String, Void, String[]&gt; { @Override protected String[] doInBackground(String... urls) { //this part works properly, and reads the matches into Global.matches List } @Override protected void onPostExecute(String[] result) { setMatches(); } } public void setLeagues() { spinnerLeague = (Spinner) findViewById(R.id.spinner_league); ArrayAdapter&lt;String&gt; dataAdapter = new ArrayAdapter&lt;String&gt;(this,android.R.layout.simple_spinner_item, Global.leagues); dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinnerLeague.setAdapter(dataAdapter); spinnerLeague.setOnItemSelectedListener(new OnItemSelectedListener() { public void onItemSelected(AdapterView&lt;?&gt; parent, View view, int position, long id) { spinnerLeague = (Spinner) findViewById(R.id.spinner_league); if(position!=0){ spinnerMatch.setEnabled(true); Global.spinnerLeaguePos=position; GetMatches task = new GetMatches(); String requestString = "http://" + Global.serverIp +":8080/server/GetCurrentMatches/"+Global.spinnerLeaguePos; task.execute(new String[] { requestString }); } else{ setMatches(); spinnerMatch.setEnabled(false); Global.spinnerLeaguePos=position; } } public void onNothingSelected(AdapterView&lt;?&gt; parent) { // TODO Auto-generated method stub } }); } public void setMatches() { spinnerMatch = (Spinner) findViewById(R.id.spinner_match); ArrayAdapter&lt;String&gt; dataAdapter = new ArrayAdapter&lt;String&gt;(this,android.R.layout.simple_spinner_item, Global.matches); dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinnerMatch.setAdapter(dataAdapter); spinnerMatch.setOnItemSelectedListener(new OnItemSelectedListener() { public void onItemSelected(AdapterView&lt;?&gt; parent, View view, int position, long id) { Global.spinnerMatchPos=position; } public void onNothingSelected(AdapterView&lt;?&gt; parent) { // TODO Auto-generated method stub } }); } </code></pre>
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    1. COit would help if you printed the whole stack trace of the nullpointerexception.
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    2. COperhaps you should take a look at the method onConfigChanged(). It lets you deal with configurations changes really easily.
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    3. COI have added the full stack.
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