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Worked around back button navigation issue

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Calling startWithFragmentAsUser() without specifying FLAG_ACTIVITY_NEW_TASK to
the intent starting the fragment could cause a native stack corruption. See
b/17523189. However, adding that flag and start the preference panel with the
same UserHandler will make it impossible to use back button to return to the
previous screen. See b/20042570.

We work around this issue by adding FLAG_ACTIVITY_NEW_TASK to the intent, while
doing another check here to call startPreferencePanel() instead of
startWithFragmentAsUser() when we're calling it as the same user.

Bug: 20042570
Change-Id: I26b269414f410912b77aaa553a3fccebfa148659
This commit is contained in:
Lifu Tang
2015-04-02 12:05:46 -07:00
parent 390910b333
commit d033285ca7
2 changed files with 25 additions and 17 deletions
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32
src/com/android/settings/SettingsActivity.java
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@@ -928,17 +928,31 @@ public class SettingsActivity extends Activity
*/
public void startPreferencePanelAsUser(String fragmentClass, Bundle args, int titleRes,
CharSequence titleText, UserHandle userHandle) {
String title = null;
if (titleRes < 0) {
if (titleText != null) {
title = titleText.toString();
} else {
// There not much we can do in that case
title = "";
// This is a workaround.
//
// Calling startWithFragmentAsUser() without specifying FLAG_ACTIVITY_NEW_TASK to the intent
// starting the fragment could cause a native stack corruption. See b/17523189. However,
// adding that flag and start the preference panel with the same UserHandler will make it
// impossible to use back button to return to the previous screen. See b/20042570.
//
// We work around this issue by adding FLAG_ACTIVITY_NEW_TASK to the intent, while doing
// another check here to call startPreferencePanel() instead of startWithFragmentAsUser()
// when we're calling it as the same user.
if (userHandle.getIdentifier() == UserHandle.myUserId()) {
startPreferencePanel(fragmentClass, args, titleRes, titleText, null, 0);
} else {
String title = null;
if (titleRes < 0) {
if (titleText != null) {
title = titleText.toString();
} else {
// There not much we can do in that case
title = "";
}
}
Utils.startWithFragmentAsUser(this, fragmentClass, args,
titleRes, title, mIsShortcut, userHandle);
}
Utils.startWithFragmentAsUser(this, fragmentClass, args,
titleRes, title, mIsShortcut, userHandle);
}
/**