来自 XML 首选项的 UnknownFormatConversionException（仅在一加一上）

Question

I'm getting following exception when trying to display ListPreference in a PreferenceFragment .

Note that this happens only on Oneplus One device. I've tried the same on Nexus 4, Moto G and S5 without any issues.

Stack trace:

09-08 14:33:50.434  20107-20107/com.callsign.ferret E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.callsign.ferret, PID: 20107
java.util.UnknownFormatConversionException: Conversion:
        at java.util.Formatter$FormatSpecifierParser.unknownFormatConversionException(Formatter.java:2321)
        at java.util.Formatter$FormatSpecifierParser.advance(Formatter.java:2315)
        at java.util.Formatter$FormatSpecifierParser.parseConversionType(Formatter.java:2394)
        at java.util.Formatter$FormatSpecifierParser.parseArgumentIndexAndFlags(Formatter.java:2365)
        at java.util.Formatter$FormatSpecifierParser.parseFormatToken(Formatter.java:2298)
        at java.util.Formatter.doFormat(Formatter.java:1071)
        at java.util.Formatter.format(Formatter.java:1042)
        at java.util.Formatter.format(Formatter.java:1011)
        at java.lang.String.format(String.java:1803)
        at java.lang.String.format(String.java:1777)
        at android.preference.ListPreference.getSummary(ListPreference.java:168)
        at android.preference.Preference.onBindView(Preference.java:550)
        at android.preference.Preference.getView(Preference.java:489)
        at android.preference.PreferenceGroupAdapter.getView(PreferenceGroupAdapter.java:246)
        at android.widget.AbsListView.obtainView(AbsListView.java:2349)
        at android.widget.ListView.makeAndAddView(ListView.java:1864)
        at android.widget.ListView.fillDown(ListView.java:698)
        at android.widget.ListView.fillGap(ListView.java:662)
        at android.widget.AbsListView.trackMotionScroll(AbsListView.java:5007)
        at android.widget.AbsListView.scrollIfNeeded(AbsListView.java:3424)
        at android.widget.AbsListView.onTouchMove(AbsListView.java:3807)
        at android.widget.AbsListView.onTouchEvent(AbsListView.java:3638)
        at android.view.View.dispatchTouchEvent(View.java:8472)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2400)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2093)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2406)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2107)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2406)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2107)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2406)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2107)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2406)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2107)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2406)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2107)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2406)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2107)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2406)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2107)
        at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2625)
        at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1770)
        at android.app.Activity.dispatchTouchEvent(Activity.java:2742)
        at android.support.v7.internal.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60)
        at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2586)
        at android.view.View.dispatchPointerEvent(View.java:8667)
        at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4129)
        at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3995)
        at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3550)
        at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3603)
        at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3569)
        at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3686)
        at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3577)
        at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3743)
        at android.view.ViewRootImpl$InputStage.deliver(ViewRootImp

preferences.xml loaded to my PreferenceFragment :

<ListPreference
        android:key="@string/pref_key_app_orientation_frequency"
        android:title="@string/pref_app_orientation_frequency"
        android:enabled="false"
        android:entryValues="@array/pref_orientation_frequency_values"
        android:entries="@array/pref_orientation_frequency"/>

arrays.xml containing above referenced arrays:

<string-array name="pref_orientation_frequency_values">
    <item>100</item>
    <item>50</item>
    <item>25</item>
    <item>10</item>
</string-array>

<string-array name="pref_orientation_frequency">
    <item>@string/percent_100</item>
    <item>@string/percent_50</item>
    <item>@string/percent_25</item>
    <item>@string/percent_10</item>
</string-array>

strings.xml containing above referenced strings:

<string name="percent_100">100%</string>
<string name="percent_50">50%</string>
<string name="percent_25">25%</string>
<string name="percent_10">10%</string>

I first thought it was related to the percentage symbol, but removing it didn't solve the issue. I can't see any hint in the stack trace and this issue seems to be device specific.

Answer 1

I had the same exception, but in a Galaxy S5. I solved using '%%' instead of '%' in strings.xml.

<string name="percent_100">100%%</string>
<string name="percent_50">50%%</string>
<string name="percent_25">25%%</string>
<string name="percent_10">10%%</string>

regards

Answer 2

Using %% will cause exceptions on some Android versions, different solutions exist as explained here , most of them quite complicated for such a simple task.

I decided to avoid the problem by using the unicode of a smaller version of the percentage character:

﹪

Answer 3

Maybe your problem is with summary definition (see log at android.preference.ListPreference.getSummary(ListPreference.java:168) Do you define summary somewhere in code?

I had a similar problem when I defined summary as "21 %" in xml(just for testing):

<ListPreference
...
app:summary="@string/percentage(value 21%)"
/>

this worked well:

<ListPreference
...
app:summary="@string/percentage(value 21%%)"
/>