Refresh after clearing, tweak warn threshold.

Refresh UI after clearing cache.  Hide user header on single-user
devices to match UX spec.  Refine adopted storage warning threshold
based on experiments with various devices.

For example, a typical internal storage device runs the benchmark
in about 600ms.  Very fast SD cards take about 1700ms, moderate speed
SD cards take about 3800ms, and slow SD cards take about 6800ms.

Bug: 22345902, 22487370
Change-Id: I6066f3b78dbb32277ae94b79e325500724f83c7e

src/com/android/settings/deviceinfo/PrivateVolumeSettings.java

@@ -192,8 +192,8 @@ public class PrivateVolumeSettings extends SettingsPreferenceFragment {
         for (int userIndex = 0; userIndex < userCount; ++userIndex) {
             final UserInfo userInfo = allUsers.get(userIndex);
             if (isProfileOf(mCurrentUser, userInfo)) {
-                PreferenceCategory details = addCategory(screen,
+                final PreferenceGroup details = showHeaders ?
-                        showHeaders ? userInfo.name : null);
+                        addCategory(screen, userInfo.name) : screen;
                 addDetailItems(details, showShared, userInfo.id);
                 ++addedUserCount;
             }
@@ -201,7 +201,7 @@ public class PrivateVolumeSettings extends SettingsPreferenceFragment {
 
         // Add rest of users
         if (userCount - addedUserCount > 0) {
-            PreferenceCategory otherUsers = addCategory(screen,
+            PreferenceGroup otherUsers = addCategory(screen,
                     getText(R.string.storage_other_users));
             for (int userIndex = 0; userIndex < userCount; ++userIndex) {
                 final UserInfo userInfo = allUsers.get(userIndex);
@@ -253,7 +253,7 @@ public class PrivateVolumeSettings extends SettingsPreferenceFragment {
         return category;
     }
 
-    private void addDetailItems(PreferenceCategory category, boolean showShared, int userId) {
+    private void addDetailItems(PreferenceGroup category, boolean showShared, int userId) {
         final int[] itemsToAdd = (showShared ? ITEMS_SHOW_SHARED : ITEMS_NO_SHOW_SHARED);
         for (int i = 0; i < itemsToAdd.length; ++i) {
             addItem(category, itemsToAdd[i], null, userId);
@@ -719,8 +719,13 @@ public class PrivateVolumeSettings extends SettingsPreferenceFragment {
         public void onRemoveCompleted(final String packageName, final boolean succeeded) {
             synchronized (this) {
                 if (--mRemaining == 0) {
+                    mTarget.getActivity().runOnUiThread(new Runnable() {
+                        @Override
+                        public void run() {
                             mTarget.update();
                         }
+                    });
+                }
             }
         }
     }

src/com/android/settings/deviceinfo/StorageWizardBase.java

@@ -176,6 +176,10 @@ public abstract class StorageWizardBase extends Activity {
         }
     }
 
+    protected void setKeepScreenOn(boolean keepScreenOn) {
+        getSetupWizardLayout().setKeepScreenOn(keepScreenOn);
+    }
+
     public void onNavigateNext() {
         throw new UnsupportedOperationException();
     }

src/com/android/settings/deviceinfo/StorageWizardFormatProgress.java

@@ -27,7 +27,6 @@ import android.content.Intent;
 import android.content.pm.IPackageMoveObserver;
 import android.os.AsyncTask;
 import android.os.Bundle;
-import android.os.RemoteException;
 import android.os.storage.DiskInfo;
 import android.os.storage.StorageManager;
 import android.os.storage.VolumeInfo;
@@ -55,6 +54,7 @@ public class StorageWizardFormatProgress extends StorageWizardBase {
             return;
         }
         setContentView(R.layout.storage_wizard_progress);
+        setKeepScreenOn(true);
 
         mFormatPrivate = getIntent().getBooleanExtra(
                 StorageWizardFormatConfirm.EXTRA_FORMAT_PRIVATE, false);
@@ -144,16 +144,22 @@ public class StorageWizardFormatProgress extends StorageWizardBase {
                 return;
             }
 
+            if (activity.mFormatPrivate) {
                 final float pct = (float) mInternalBench / (float) mPrivateBench;
                 Log.d(TAG, "New volume is " + pct + "x the speed of internal");
 
-            // TODO: refine this warning threshold
+                // To help set user expectations around device performance, we
-            if (mPrivateBench > 2000000000) {
+                // warn if the adopted media is 0.25x the speed of internal
+                // storage or slower.
+                if (Float.isNaN(pct) || pct < 0.25) {
                     final SlowWarningFragment dialog = new SlowWarningFragment();
                     dialog.show(activity.getFragmentManager(), TAG_SLOW_WARNING);
                 } else {
                     activity.onFormatFinished();
                 }
+            } else {
+                activity.onFormatFinished();
+            }
         }
     }