Settings : Add hooks for device specific features

Add support for :

Devices with bluetooth input peripherals
Devices with screen gesture support
Devices with a back touchpad

Change-Id: Ia4835c69a8ba8fb76597e0ab0540f8ef1ed6e322

1 files changed, 92 insertions, 0 deletions

diff --git a/src/com/android/settings/Utils.java b/src/com/android/settings/Utils.java
index 075194a..b1170c8 100644
--- a/src/com/android/settings/Utils.java
+++ b/src/com/android/settings/Utils.java
@@ -223,6 +223,98 @@ public final class Utils {
         return false;
     }
 
+    /**
+     * Finds a matching activity for a preference's intent. If a matching
+     * activity is not found, it will remove the preference. The icon, title and
+     * summary of the preference will also be updated with the values retrieved
+     * from the activity's meta-data elements. If no meta-data elements are
+     * specified then the preference title will be set to match the label of the
+     * activity, an icon and summary text will not be displayed.
+     *
+     * @param context The context.
+     * @param parentPreferenceGroup The preference group that contains the
+     *            preference whose intent is being resolved.
+     * @param preferenceKey The key of the preference whose intent is being
+     *            resolved.
+     *
+     * @return Whether an activity was found. If false, the preference was
+     *         removed.
+     *
+     * @see {@link #META_DATA_PREFERENCE_ICON}
+     *      {@link #META_DATA_PREFERENCE_TITLE}
+     *      {@link #META_DATA_PREFERENCE_SUMMARY}
+     */
+    public static boolean updatePreferenceToSpecificActivityFromMetaDataOrRemove(Context context,
+            PreferenceGroup parentPreferenceGroup, String preferenceKey) {
+
+        Preference preference = parentPreferenceGroup.findPreference(preferenceKey);
+        if (preference == null) {
+            return false;
+        }
+
+        Intent intent = preference.getIntent();
+        if (intent != null) {
+            // Find the activity that is in the system image
+            PackageManager pm = context.getPackageManager();
+            List<ResolveInfo> list = pm.queryIntentActivities(intent, PackageManager.GET_META_DATA);
+            int listSize = list.size();
+            for (int i = 0; i < listSize; i++) {
+                ResolveInfo resolveInfo = list.get(i);
+                if ((resolveInfo.activityInfo.applicationInfo.flags
+                        & ApplicationInfo.FLAG_SYSTEM) != 0) {
+                    Drawable icon = null;
+                    String title = null;
+                    String summary = null;
+
+                    // Get the activity's meta-data
+                    try {
+                        Resources res = pm
+                                .getResourcesForApplication(resolveInfo.activityInfo.packageName);
+                        Bundle metaData = resolveInfo.activityInfo.metaData;
+
+                        if (res != null && metaData != null) {
+                            if (preference instanceof IconPreferenceScreen) {
+                                icon = res.getDrawable(metaData.getInt(META_DATA_PREFERENCE_ICON));
+                            }
+                            title = res.getString(metaData.getInt(META_DATA_PREFERENCE_TITLE));
+                            summary = res.getString(metaData.getInt(META_DATA_PREFERENCE_SUMMARY));
+                        }
+                    } catch (NameNotFoundException e) {
+                        // Ignore
+                    } catch (NotFoundException e) {
+                        // Ignore
+                    }
+
+                    // Set the preference title to the activity's label if no
+                    // meta-data is found
+                    if (TextUtils.isEmpty(title)) {
+                        title = resolveInfo.loadLabel(pm).toString();
+                    }
+
+                    // Set icon, title and summary for the preference
+                    preference.setTitle(title);
+                    preference.setSummary(summary);
+                    if (preference instanceof IconPreferenceScreen) {
+                        IconPreferenceScreen iconPreference = (IconPreferenceScreen) preference;
+                        iconPreference.setIcon(icon);
+                    }
+
+                    // Replace the intent with this specific activity
+                    preference.setIntent(new Intent().setClassName(
+                            resolveInfo.activityInfo.packageName,
+                            resolveInfo.activityInfo.name));
+
+                   return true;
+                }
+            }
+        }
+
+        // Did not find a matching activity, so remove the preference
+        parentPreferenceGroup.removePreference(preference);
+
+        return false;
+    }
+
     public static boolean updateTileToSpecificActivityFromMetaDataOrRemove(Context context,
             DashboardTile tile) {