Use preference key specified in injected settings.

Bug: 31002801
Test: make RunSettingsRoboTests

Reads in optional metadata field for specifying the key used for an
injected preference.

Change-Id: Ief2ff10c508d42f91906b531cf34906c1c42fdd4

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

@@ -109,6 +109,9 @@ public class DashboardFeatureProviderImpl implements DashboardFeatureProvider {
         if (tile == null || tile.intent == null) {
             return null;
         }
+        if (!TextUtils.isEmpty(tile.key)) {
+            return tile.key;
+        }
         final StringBuilder sb = new StringBuilder(DASHBOARD_TILE_PREF_KEY_PREFIX);
         final ComponentName component = tile.intent.getComponent();
         sb.append(component.getClassName());

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

@@ -144,6 +144,20 @@ public class DashboardFeatureProviderImplTest {
         assertThat(preference.getOrder()).isEqualTo(Preference.DEFAULT_ORDER);
     }
 
+    @Test
+    public void bindPreference_withNullKeyTileKey_shouldUseTileKey() {
+        final Preference preference = new Preference(
+                ShadowApplication.getInstance().getApplicationContext());
+        final Tile tile = new Tile();
+        tile.key = "key";
+        tile.intent = new Intent();
+        tile.intent.setComponent(new ComponentName("pkg", "class"));
+        mImpl.bindPreferenceToTile(mActivity, preference, tile, null /* key */
+                , Preference.DEFAULT_ORDER);
+
+        assertThat(preference.getKey()).isEqualTo(tile.key);
+    }
+
     @Test
     public void bindPreference_withBaseOrder_shouldOffsetPriority() {
         final int baseOrder = 100;