The preferences are apparently *cleared *when one tries to load them when
there is a null key which is bad ! Reproducer :
public class XmlExceptionTest extends AndroidTestCase {
/** Run it twice - on the second run the exception is thrown */
public void testXmlException() {
Context ctx = getContext();
SharedPreferences prefs = PreferenceManager
.getDefaultSharedPreferences(ctx); // exception thrown here
(line 18)
// and apparently it clears the prefs as the condition below is
false
if (prefs.contains("run_once")) { // false
Log.w("XmlExceptionTest",
"contains null key :" + prefs.contains(null));
}
Editor e = prefs.edit();
e.putBoolean("run_once", true).commit();
e.putString(null, "I put a sting with null key").commit();
assertTrue("Contains null", prefs.contains(null));
PreferenceManager.getDefaultSharedPreferences(ctx); // exception
// NOT thrown here - why ? - apparently there is a static
factory
// returning the instance it already constructed
// e.clear().commit(); // this eliminates the exception
}
}
exception :
W/ApplicationContext(): getSharedPreferences
W/ApplicationContext(): org.xmlpull.v1.XmlPullParserException: Map
value without name attribute: string
W/ApplicationContext(): at
com.android.internal.util.XmlUtils.readThisMapXml(XmlUtils.java:521)
W/ApplicationContext(): at
com.android.internal.util.XmlUtils.readThisValueXml(XmlUtils.java:733)
W/ApplicationContext(): at
com.android.internal.util.XmlUtils.readValueXml(XmlUtils.java:667)
W/ApplicationContext(): at
com.android.internal.util.XmlUtils.readMapXml(XmlUtils.java:470)
W/ApplicationContext(): at
android.app.ContextImpl.getSharedPreferences(ContextImpl.java:361)
W/ApplicationContext(): at
android.preference.PreferenceManager.getDefaultSharedPreferences(PreferenceManager.java:348)
W/ApplicationContext(): at
gr.uoa.di.android.helpers.test.XmlExceptionTest.testXmlException(XmlExceptionTest.java:18)
W/ApplicationContext(): at
java.lang.reflect.Method.invokeNative(Native Method)
W/ApplicationContext(): at
java.lang.reflect.Method.invoke(Method.java:521)
W/ApplicationContext(): at
junit.framework.TestCase.runTest(TestCase.java:154)
W/ApplicationContext(): at
junit.framework.TestCase.runBare(TestCase.java:127)
W/ApplicationContext(): at
junit.framework.TestResult$1.protect(TestResult.java:106)
W/ApplicationContext(): at
junit.framework.TestResult.runProtected(TestResult.java:124)
W/ApplicationContext(): at
junit.framework.TestResult.run(TestResult.java:109)
W/ApplicationContext(): at
junit.framework.TestCase.run(TestCase.java:118)
W/ApplicationContext(): at
android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:169)
W/ApplicationContext(): at
android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:154)
W/ApplicationContext(): at
android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:520)
W/ApplicationContext(): at
android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1447)
Posted in SO
here<http://stackoverflow.com/questions/19610569/android-sharedpreferences-null-keys-values-and-sets-corner-cases>and
in the relevant thread
here <http://stackoverflow.com/a/19621603/281545> - but still no answers
Any ideas ?
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