NavUtils.navigateUpTo() does not start any Activity

Question

I have two activities

• MainActivity
• DeepLinkActivity

I set up everything to use the NavUtils for navi

Answer 1

Do you use an as your MAIN / LAUNCHER? When I change the to an , up navigation works correctly. For some odd reason, navigation does not work properly when aliases are involved.

There is also a weird UI glitch which indicates that the native ActivityManager has a bug. After navigating up to the app's main activity using navigateUpTo(), press the device's back key. The current app will perform the activity exit animation and then immediately afterwards, the next-most-recent app will also perform an activity exit animation. This happens even if you launched into the current app from Android's Home screen. If you clear all recent apps and try the nav-up-then-back steps again, a random (i.e. unexpected) app will be presented during the exit animation.

Other apps should never be presented in these cases. It seems as though the activity manager is not managing the history stack correctly.

The offending bug may be found within the following method which appears at the bottom of this diff:

+    public boolean navigateUpTo(IBinder token, Intent destIntent, int resultCode,
+            Intent resultData) {
+        ComponentName dest = destIntent.getComponent();
+
+        synchronized (this) {
+            ActivityRecord srec = ActivityRecord.forToken(token);
+            ArrayList history = srec.stack.mHistory;
+            final int start = history.indexOf(srec);
+            if (start < 0) {
+                // Current activity is not in history stack; do nothing.
+                return false;
+            }
+            int finishTo = start - 1;
+            ActivityRecord parent = null;
+            boolean foundParentInTask = false;
+            if (dest != null) {
+                TaskRecord tr = srec.task;
+                for (int i = start - 1; i >= 0; i--) {
+                    ActivityRecord r = history.get(i);
+                    if (tr != r.task) {
+                        // Couldn't find parent in the same task; stop at the one above this.
+                        // (Root of current task; in-app "home" behavior)
+                        // Always at least finish the current activity.
+                        finishTo = Math.min(start - 1, i + 1);
+                        parent = history.get(finishTo);
+                        break;
+                    } else if (r.info.packageName.equals(dest.getPackageName()) &&
+                            r.info.name.equals(dest.getClassName())) {
+                        finishTo = i;
+                        parent = r;
+                        foundParentInTask = true;
+                        break;
+                    }
+                }
+            }
+
+            if (mController != null) {
+                ActivityRecord next = mMainStack.topRunningActivityLocked(token, 0);
+                if (next != null) {
+                    // ask watcher if this is allowed
+                    boolean resumeOK = true;
+                    try {
+                        resumeOK = mController.activityResuming(next.packageName);
+                    } catch (RemoteException e) {
+                        mController = null;
+                    }
+
+                    if (!resumeOK) {
+                        return false;
+                    }
+                }
+            }
+            final long origId = Binder.clearCallingIdentity();
+            for (int i = start; i > finishTo; i--) {
+                ActivityRecord r = history.get(i);
+                mMainStack.requestFinishActivityLocked(r.appToken, resultCode, resultData,
+                        "navigate-up");
+                // Only return the supplied result for the first activity finished
+                resultCode = Activity.RESULT_CANCELED;
+                resultData = null;
+            }
+
+            if (parent != null && foundParentInTask) {
+                final int parentLaunchMode = parent.info.launchMode;
+                final int destIntentFlags = destIntent.getFlags();
+                if (parentLaunchMode == ActivityInfo.LAUNCH_SINGLE_INSTANCE ||
+                        parentLaunchMode == ActivityInfo.LAUNCH_SINGLE_TASK ||
+                        parentLaunchMode == ActivityInfo.LAUNCH_SINGLE_TOP ||
+                        (destIntentFlags & Intent.FLAG_ACTIVITY_CLEAR_TOP) != 0) {
+                    parent.deliverNewIntentLocked(srec.app.uid, destIntent);
+                } else {
+                    try {
+                        ActivityInfo aInfo = AppGlobals.getPackageManager().getActivityInfo(
+                                destIntent.getComponent(), 0, UserId.getCallingUserId());
+                        int res = mMainStack.startActivityLocked(srec.app.thread, destIntent,
+                                null, aInfo, parent.appToken, null,
+                                0, -1, parent.launchedFromUid, 0, null, true, null);
+                        foundParentInTask = res == ActivityManager.START_SUCCESS;
+                    } catch (RemoteException e) {
+                        foundParentInTask = false;
+                    }
+                    mMainStack.requestFinishActivityLocked(parent.appToken, resultCode,
+                            resultData, "navigate-up");
+                }
+            }
+            Binder.restoreCallingIdentity(origId);
+            return foundParentInTask;
+        }
+    }