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POAndroid App failing to set theme and force closes
 

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  1. POAndroid App failing to set theme and force closes
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    <p>I'm developing a wallpaper application that can use either Holo Light w/ Dark Action Bar, Holo Light, or Holo Dark themes. I have an a preference activity that is supposed to allow the user of said app to change between the 3 as he/she pleases.</p> <p>Heres a snippet of the preference activity:</p> <pre><code>@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //add the prefernces.xml layout addPreferencesFromResource(R.xml.prefs); ActionBar bar = getActionBar(); bar.setTitle(R.string.settings); bar.setDisplayHomeAsUpEnabled(true); } </code></pre> <p>Prefs.xml:</p> <pre><code> &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" &gt; &lt;ListPreference android:entries="@array/theme" android:entryValues="@array/themeValues" android:title="Themes" android:enabled="true" android:key="theme" android:summary="Select which holo theme you prefer." /&gt; &lt;/PreferenceScreen&gt; </code></pre> <p>themes.xml:</p> <pre><code> &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;resources&gt; &lt;string-array name="theme"&gt; &lt;item&gt;Holo Light with Dark Action Bar&lt;/item&gt; &lt;item&gt;Holo Light&lt;/item&gt; &lt;item&gt;Holo Dark&lt;/item&gt; &lt;/string-array&gt; &lt;string-array name="themeValues"&gt; &lt;item&gt;@style/Theme_Light_DarkActionBar&lt;/item&gt; &lt;item&gt;@style/Theme_Light&lt;/item&gt; &lt;item&gt;@style/Theme_Dark&lt;/item&gt; &lt;/string-array&gt; &lt;/resources&gt; </code></pre> <p>Code I'm using in WallpaperActivity.java to set the theme:</p> <pre><code>@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this); String theme = prefs.getString("theme", "defaultTheme"); setAppTheme(theme); setContentView(R.layout.activity_wallpaper); void setAppTheme(String s) { String[] theme = getResources().getStringArray(R.array.themeValues); if (s.matches("theme_light-dark")) { //Light-Dark setTheme(R.style.Theme_Light_DarkActionBar); } else if (s.matches("theme_light")) { //Light setTheme(R.style.Theme_Light); } else if (s.matches("theme_dark")) { //Dark setTheme(R.style.Theme_Dark); } else { //Oops } } </code></pre> <p>And Finally a logcat snip:</p> <pre><code> [ 01-10 05:36:17.947 2621:0xa3d E/AndroidRuntime ] FATAL EXCEPTION: main java.lang.NullPointerException at android.preference.ListPreference.onDialogClosed(ListPreference.java:264) at android.preference.DialogPreference.onDismiss(DialogPreference.java:381) at android.app.Dialog$ListenersHandler.handleMessage(Dialog.java:1228) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:4424) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>If you need anything else please let me know. Thanks!</p> <p>Update:</p> <p>It seems I'm getting a warning that reads:</p> <pre><code>The value of the local variable theme is not used </code></pre> <p>For the line:</p> <pre><code>String[] theme = getResources().getStringArray(R.array.themeValues); </code></pre>
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    1. CO`NullPointerException` is being thrown from the `ListPreference` when it tries to locate and load the `theme` array. Are you sure that the `themes.xml` file is being found/read by your `Prefs.xml` file properly?
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    2. COI'm sure it is, since if you see the prefs.xml file and look at the themes.xml file it seems to be showing/reading the array okay. The preference activity seems to display okay and show the chooser fine. How would I make sure?
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