Fix a NPE where developer options page crash sometimes.

Developer options page crash for restricted users because the page
removes all preferences while DashboardFeatureProvider tries to
manipulate preferences on screen.

Added a null check to skip changin prefs in DashboardFeatureProvider
because the pref is going to be removed either way.

Change-Id: Ic83fd0dfb2a906605fb1d992d7b36c2163630e89
Fixes: 78655710
Test: robotests

src/com/android/settings/dashboard/DashboardFeatureProviderImpl.java

@@ -133,6 +133,9 @@ public class DashboardFeatureProviderImpl implements DashboardFeatureProvider {
     @Override
     public void bindPreferenceToTile(Activity activity, int sourceMetricsCategory, Preference pref,
             Tile tile, String key, int baseOrder) {
+        if (pref == null) {
+            return;
+        }
         pref.setTitle(tile.title);
         if (!TextUtils.isEmpty(key)) {
             pref.setKey(key);
@@ -239,7 +242,7 @@ public class DashboardFeatureProviderImpl implements DashboardFeatureProvider {
         if (tile.icon != null) {
             preference.setIcon(tile.icon.loadDrawable(preference.getContext()));
         } else if (tile.metaData != null
-                && tile.metaData.containsKey(META_DATA_PREFERENCE_ICON_URI))
+                && tile.metaData.containsKey(META_DATA_PREFERENCE_ICON_URI)) {
             ThreadUtils.postOnBackgroundThread(() -> {
                 String packageName = null;
                 if (tile.intent != null) {
@@ -259,11 +262,11 @@ public class DashboardFeatureProviderImpl implements DashboardFeatureProvider {
                     return;
                 }
                 final Icon icon = Icon.createWithResource(iconInfo.first, iconInfo.second);
-                ThreadUtils.postOnMainThread(() -> {
+                ThreadUtils.postOnMainThread(() ->
-                            preference.setIcon(icon.loadDrawable(preference.getContext()));
+                        preference.setIcon(icon.loadDrawable(preference.getContext()))
-                    }
                 );
             });
+        }
     }
 
     private void launchIntentOrSelectProfile(Activity activity, Tile tile, Intent intent,

tests/robotests/src/com/android/settings/dashboard/DashboardFeatureProviderImplTest.java

@@ -24,6 +24,7 @@ import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyZeroInteractions;
 import static org.mockito.Mockito.when;
 import static org.robolectric.Shadows.shadowOf;
 
@@ -214,6 +215,15 @@ public class DashboardFeatureProviderImplTest {
                 .startActivityForResultAsUser(any(Intent.class), anyInt(), any(UserHandle.class));
     }
 
+    @Test
+    public void bindPreference_nullPreference_shouldIgnore() {
+        final Tile tile = mock(Tile.class);
+        mImpl.bindPreferenceToTile(mActivity, MetricsProto.MetricsEvent.VIEW_UNKNOWN,
+                null, tile, "123", Preference.DEFAULT_ORDER);
+
+        verifyZeroInteractions(tile);
+    }
+
     @Test
     public void bindPreference_withNullKeyNullPriority_shouldGenerateKeyAndPriority() {
         final Preference preference = new Preference(RuntimeEnvironment.application);