android 3.2 bug in apn setting

android 3.2 APN 设置时有个bug：

Duplicate procedure is below,

1.Settings ->Wireless&networks->Mobile networks->Access Point Names
2.Press menu on top-right-New APN
3."Edit access point"dialog show up
4.Press "Home" button to go to home page
5.Do step 1 again
6.Error message appears

Log msg：

02-01 08:28:54.710: ERROR/AndroidRuntime(1640): java.lang.RuntimeException: Unable to resume activity {com.android.settings/com.android.settings.ApnSettings}: java.lang.IllegalStateException: trying to requery an already closed cursor  android.content.ContentResolver$CursorWrapperInner@4055d47002-01 08:28:54.710: ERROR/AndroidRuntime(1640):     at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2288)02-01 08:28:54.710: ERROR/AndroidRuntime(1640):     at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2316)02-01 08:28:54.710: ERROR/AndroidRuntime(1640):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1050)02-01 08:28:54.710: ERROR/AndroidRuntime(1640):     at android.os.Handler.dispatchMessage(Handler.java:99)02-01 08:28:54.710: ERROR/AndroidRuntime(1640):     at android.os.Looper.loop(Looper.java:132)02-01 08:28:54.710: ERROR/AndroidRuntime(1640):     at android.app.ActivityThread.main(ActivityThread.java:4123)02-01 08:28:54.710: ERROR/AndroidRuntime(1640):     at java.lang.reflect.Method.invokeNative(Native Method)02-01 08:28:54.710: ERROR/AndroidRuntime(1640):     at java.lang.reflect.Method.invoke(Method.java:491)02-01 08:28:54.710: ERROR/AndroidRuntime(1640):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)02-01 08:28:54.710: ERROR/AndroidRuntime(1640):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)02-01 08:28:54.710: ERROR/AndroidRuntime(1640):     at dalvik.system.NativeStart.main(Native Method)02-01 08:28:54.710: ERROR/AndroidRuntime(1640): Caused by: java.lang.IllegalStateException: trying to requery an already closed cursor  android.content.ContentResolver$CursorWrapperInner@4055d47002-01 08:28:54.710: ERROR/AndroidRuntime(1640):     at android.app.Activity.performRestart(Activity.java:4438)02-01 08:28:54.710: ERROR/AndroidRuntime(1640):     at android.app.Activity.performResume(Activity.java:4460)02-01 08:28:54.710: ERROR/AndroidRuntime(1640):     at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2278)02-01 08:28:54.710: ERROR/AndroidRuntime(1640):     ... 10 more02-01 08:28:54.720: WARN/ActivityManager(244):   Force finishing activity com.android.settings/.ApnSettings02-01 08:28:54.730: WARN/ActivityManager(244):   Force finishing activity com.android.phone/.Settings

解决办法如下：

------- packages/apps/Settings/src/com/android/settings/ApnSettings.java -------index 00ef3a7..34825c5 100644@@ -149,9 +149,9 @@ public class ApnSettings extends PreferenceActivity implements             + android.os.SystemProperties.get(TelephonyProperties.PROPERTY_ICC_OPERATOR_NUMERIC, "")             + "\""; -        Cursor cursor = managedQuery(Telephony.Carriers.CONTENT_URI, new String[] {-                "_id", "name", "apn", "type"}, where,-                Telephony.Carriers.DEFAULT_SORT_ORDER);+        Cursor cursor = getContentResolver().query(Telephony.Carriers.CONTENT_URI, new String[] {+                "_id", "name", "apn", "type"}, where,null,+                Telephony.Carriers.DEFAULT_SORT_ORDER);//Modified by silvan @ 20111220          PreferenceGroup apnList = (PreferenceGroup) findPreference("apn_list");         apnList.removeAll();@@ -254,8 +254,8 @@ public class ApnSettings extends PreferenceActivity implements     private String getSelectedApnKey() {         String key = null; -        Cursor cursor = managedQuery(PREFERAPN_URI, new String[] {"_id"},-                null, Telephony.Carriers.DEFAULT_SORT_ORDER);+        Cursor cursor = getContentResolver().query(PREFERAPN_URI, new String[] {"_id"},+                null,null, Telephony.Carriers.DEFAULT_SORT_ORDER);//Modified by silvan @ 20111220         if (cursor.getCount() > 0) {             cursor.moveToFirst();             key = cursor.getString(ID_INDEX);

引起这个bug的原因参照 managedQuery和getContentResolver().query的区别。