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Fix bug #16957601 Stability: ISE in Settings: Observer com.android.settings.

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SettingsPreferenceFragment$1@273c8fdb was not registered

- add override for onUnbindPreferences() that will unregister the observer
if needed
- keep track of the root adapter so that we can unregister / register with
the correct one (by having a new PreferenceScreen the root adapter would not
be the same and thus unregistering the Observer on the new one would not work
and create the current bug)

Change-Id: I2cef0398c2ae0ab4f5ffd67ca20e8874be997bf6
This commit is contained in:
Fabrice Di Meglio
2014-08-13 10:45:19 -07:00
parent 841f760fd7
commit d83b3c2a39
1 changed files with 17 additions and 9 deletions
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22
src/com/android/settings/SettingsPreferenceFragment.java
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@@ -66,7 +66,7 @@ public class SettingsPreferenceFragment extends PreferenceFragment implements Di
private boolean mPreferenceHighlighted = false;
private Drawable mHighlightDrawable;
private Object mRegisterLock = new Object();
private ListAdapter mCurrentRootAdapter;
private boolean mIsDataSetObserverRegistered = false;
private DataSetObserver mDataSetObserver = new DataSetObserver() {
@Override
@@ -146,6 +146,11 @@ public class SettingsPreferenceFragment extends PreferenceFragment implements Di
registerObserverIfNeeded();
}
@Override
protected void onUnbindPreferences() {
unregisterObserverIfNeeded();
}
@Override
public void onStop() {
super.onStop();
@@ -154,20 +159,23 @@ public class SettingsPreferenceFragment extends PreferenceFragment implements Di
}
public void registerObserverIfNeeded() {
synchronized (mRegisterLock) {
if (!mIsDataSetObserverRegistered) {
getPreferenceScreen().getRootAdapter().registerDataSetObserver(mDataSetObserver);
mIsDataSetObserverRegistered = true;
if (mCurrentRootAdapter != null) {
mCurrentRootAdapter.unregisterDataSetObserver(mDataSetObserver);
}
mCurrentRootAdapter = getPreferenceScreen().getRootAdapter();
mCurrentRootAdapter.registerDataSetObserver(mDataSetObserver);
mIsDataSetObserverRegistered = true;
}
}
public void unregisterObserverIfNeeded() {
synchronized (mRegisterLock) {
if (mIsDataSetObserverRegistered) {
getPreferenceScreen().getRootAdapter().unregisterDataSetObserver(mDataSetObserver);
mIsDataSetObserverRegistered = false;
if (mCurrentRootAdapter != null) {
mCurrentRootAdapter.unregisterDataSetObserver(mDataSetObserver);
mCurrentRootAdapter = null;
}
mIsDataSetObserverRegistered = false;
}
}