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POWhy PreferenceActivity throws UnsupportedEncodingException?
 

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  1. POWhy PreferenceActivity throws UnsupportedEncodingException?
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    <p>I'm trying to add settings to my application using PreferenceActivity (I'm targeting API level 8), I started with only one checkbox:</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;CheckBoxPreference android:key="pref_fps" android:title="FPS" android:defaultValue="false" /&gt; &lt;/PreferenceScreen&gt; </code></pre> <p>My PreferenceActivity subclass only defines one "onCreate" method:</p> <pre><code>@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); addPreferencesFromResource(R.xml.preferences); } </code></pre> <p>Everything seemed to be working fine at first, but I noticed that preferences were lost after an application restart. Looking at the logs, it seems the preferences can't be saved to disk. Every time I click on the checkbox in the PreferenceActivity, I'm getting this exception:</p> <pre><code>W/ApplicationContext( 9542): writeFileLocked: Got exception: W/ApplicationContext( 9542): java.io.UnsupportedEncodingException: utf-8 W/ApplicationContext( 9542): at com.android.internal.util.FastXmlSerializer.setOutput(FastXmlSerializer.java:297) W/ApplicationContext( 9542): at com.android.internal.util.XmlUtils.writeMapXml(XmlUtils.java:181) W/ApplicationContext( 9542): at android.app.ContextImpl$SharedPreferencesImpl.writeFileLocked(ContextImpl.java:2928) W/ApplicationContext( 9542): at android.app.ContextImpl$SharedPreferencesImpl.access$300(ContextImpl.java:2676) W/ApplicationContext( 9542): at android.app.ContextImpl$SharedPreferencesImpl$EditorImpl.commit(ContextImpl.java:2861) W/ApplicationContext( 9542): at android.preference.Preference.tryCommit(Preference.java:1198) W/ApplicationContext( 9542): at android.preference.Preference.persistBoolean(Preference.java:1403) W/ApplicationContext( 9542): at android.preference.CheckBoxPreference.setChecked(CheckBoxPreference.java:154) W/ApplicationContext( 9542): at android.preference.CheckBoxPreference.onClick(CheckBoxPreference.java:143) W/ApplicationContext( 9542): at android.preference.Preference.performClick(Preference.java:810) W/ApplicationContext( 9542): at android.preference.PreferenceScreen.onItemClick(PreferenceScreen.java:198) W/ApplicationContext( 9542): at android.widget.AdapterView.performItemClick(AdapterView.java:284) W/ApplicationContext( 9542): at android.widget.ListView.performItemClick(ListView.java:3382) W/ApplicationContext( 9542): at android.widget.AbsListView$PerformClick.run(AbsListView.java:1696) W/ApplicationContext( 9542): at android.os.Handler.handleCallback(Handler.java:587) W/ApplicationContext( 9542): at android.os.Handler.dispatchMessage(Handler.java:92) W/ApplicationContext( 9542): at android.os.Looper.loop(Looper.java:144) W/ApplicationContext( 9542): at android.app.ActivityThread.main(ActivityThread.java:4937) W/ApplicationContext( 9542): at java.lang.reflect.Method.invokeNative(Native Method) W/ApplicationContext( 9542): at java.lang.reflect.Method.invoke(Method.java:521) W/ApplicationContext( 9542): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) W/ApplicationContext( 9542): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) W/ApplicationContext( 9542): at dalvik.system.NativeStart.main(Native Method) W/ApplicationContext( 9542): Caused by: java.nio.charset.UnsupportedCharsetException: The unsupported charset name is "utf-8". W/ApplicationContext( 9542): at java.nio.charset.Charset.forName(Charset.java:544) W/ApplicationContext( 9542): at com.android.internal.util.FastXmlSerializer.setOutput(FastXmlSerializer.java:292) W/ApplicationContext( 9542): ... 22 more </code></pre> <p>Behavior is the same on the emulator and on a real device.</p> <p>What am I doing wrong?</p>
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    1. USGuillaume
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    1. CODo you try to Clean your project and re-build, than uninstall your app and re-install it to check whether it can be reproduced？
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      1. USbuptcoder
    2. COYeah, just to make sure, I just uninstalled the application and did a new clean build, but it's still the same.
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      1. USGuillaume
    3. COYou said you get this exception when you click on checkbox. Could you paste the checkbox listener too? the pref xml has no problem. utf-8 should be supported..
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      1. USTarun
 

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