Add setting to turn off icon badging

Redirects to system Notifications setting page.

Bug: 36815147
Change-Id: I5ee542f94ed51a73a57df3a726384944ff3ee71d

res/values/strings.xml

@@ -172,6 +172,12 @@
     <string name="allow_rotation_desc">When phone is rotated</string>
     <!-- Text explaining that rotation is disabled in Display settings. 'Display' refers to the Display section in system settings [CHAR LIMIT=100] -->
     <string name="allow_rotation_blocked_desc">Current Display setting doesn\'t permit rotation</string>
+    <!-- Title for Icon Badging setting. Tapping this will link to the system Notifications Settings screen where the user can turn off badging globally. [CHAR LIMIT=50] -->
+    <string name="icon_badging_title">Icon badging</string>
+    <!-- Text to indicate that the system icon badging setting is on [CHAR LIMIT=100] -->
+    <string name="icon_badging_desc_on">On for all apps</string>
+    <!-- Text to indicate that the system icon badging setting is off [CHAR LIMIT=100] -->
+    <string name="icon_badging_desc_off">Off for all apps</string>
 
     <!-- Label for the setting that allows the automatic placement of launcher shortcuts for applications and games installed on the device [CHAR LIMIT=40] -->
     <string name="auto_add_shortcuts_label">Add icon to Home screen</string>

res/xml/launcher_preferences.xml

@@ -16,13 +16,6 @@
 
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
 
-    <SwitchPreference
-            android:key="pref_allowRotation"
-            android:title="@string/allow_rotation_title"
-            android:defaultValue="@bool/allow_rotation"
-            android:persistent="true"
-    />
-
     <SwitchPreference
         android:key="pref_add_icon_to_home"
         android:title="@string/auto_add_shortcuts_label"
@@ -40,4 +33,23 @@
         android:defaultValue=""
         android:persistent="false" />
 
+    <Preference
+        android:key="pref_icon_badging"
+        android:title="@string/icon_badging_title"
+        android:persistent="false">
+        <intent android:action="android.settings.NOTIFICATION_SETTINGS">
+            <!-- This extra highlights the "Allow icon badges" field in Notification settings -->
+            <extra
+                android:name=":settings:fragment_args_key"
+                android:value="notification_badging" />
+        </intent>
+    </Preference>/>
+
+    <SwitchPreference
+        android:key="pref_allowRotation"
+        android:title="@string/allow_rotation_title"
+        android:defaultValue="@bool/allow_rotation"
+        android:persistent="true"
+        />
+
 </PreferenceScreen>

src/com/android/launcher3/SettingsActivity.java

@@ -34,6 +34,11 @@ import com.android.launcher3.graphics.IconShapeOverride;
  * Settings activity for Launcher. Currently implements the following setting: Allow rotation
  */
 public class SettingsActivity extends Activity {
+
+    private static final String ICON_BADGING_PREFERENCE_KEY = "pref_icon_badging";
+    // TODO: use Settings.Secure.NOTIFICATION_BADGING
+    private static final String NOTIFICATION_BADGING = "notification_badging";
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -50,6 +55,7 @@ public class SettingsActivity extends Activity {
     public static class LauncherSettingsFragment extends PreferenceFragment {
 
         private SystemDisplayRotationLockObserver mRotationLockObserver;
+        private IconBadgingObserver mIconBadgingObserver;
 
         @Override
         public void onCreate(Bundle savedInstanceState) {
@@ -57,13 +63,14 @@ public class SettingsActivity extends Activity {
             getPreferenceManager().setSharedPreferencesName(LauncherFiles.SHARED_PREFERENCES_KEY);
             addPreferencesFromResource(R.xml.launcher_preferences);
 
+            ContentResolver resolver = getActivity().getContentResolver();
+
             // Setup allow rotation preference
             Preference rotationPref = findPreference(Utilities.ALLOW_ROTATION_PREFERENCE_KEY);
             if (getResources().getBoolean(R.bool.allow_rotation)) {
                 // Launcher supports rotation by default. No need to show this setting.
                 getPreferenceScreen().removePreference(rotationPref);
             } else {
-                ContentResolver resolver = getActivity().getContentResolver();
                 mRotationLockObserver = new SystemDisplayRotationLockObserver(rotationPref, resolver);
 
                 // Register a content observer to listen for system setting changes while
@@ -77,9 +84,18 @@ public class SettingsActivity extends Activity {
                 rotationPref.setDefaultValue(Utilities.getAllowRotationDefaultValue(getActivity()));
             }
 
+            Preference iconBadgingPref = findPreference(ICON_BADGING_PREFERENCE_KEY);
             if (!BuildCompat.isAtLeastO()) {
                 getPreferenceScreen().removePreference(
                         findPreference(SessionCommitReceiver.ADD_ICON_PREFERENCE_KEY));
+                getPreferenceScreen().removePreference(iconBadgingPref);
+            } else {
+                // Listen to system notification badge settings while this UI is active.
+                mIconBadgingObserver = new IconBadgingObserver(iconBadgingPref, resolver);
+                resolver.registerContentObserver(
+                        Settings.Secure.getUriFor(NOTIFICATION_BADGING),
+                        false, mIconBadgingObserver);
+                mIconBadgingObserver.onChange(true);
             }
 
             Preference iconShapeOverride = findPreference(IconShapeOverride.KEY_PREFERENCE);
@@ -98,6 +114,10 @@ public class SettingsActivity extends Activity {
                 getActivity().getContentResolver().unregisterContentObserver(mRotationLockObserver);
                 mRotationLockObserver = null;
             }
+            if (mIconBadgingObserver != null) {
+                getActivity().getContentResolver().unregisterContentObserver(mIconBadgingObserver);
+                mIconBadgingObserver = null;
+            }
             super.onDestroy();
         }
     }
@@ -127,4 +147,29 @@ public class SettingsActivity extends Activity {
                     ? R.string.allow_rotation_desc : R.string.allow_rotation_blocked_desc);
         }
     }
+
+    /**
+     * Content observer which listens for system badging setting changes,
+     * and updates the launcher badging setting subtext accordingly.
+     */
+    private static class IconBadgingObserver extends ContentObserver {
+
+        private final Preference mBadgingPref;
+        private final ContentResolver mResolver;
+
+        public IconBadgingObserver(Preference badgingPref, ContentResolver resolver) {
+            super(new Handler());
+            mBadgingPref = badgingPref;
+            mResolver = resolver;
+        }
+
+        @Override
+        public void onChange(boolean selfChange) {
+            boolean enabled = Settings.Secure.getInt(mResolver, NOTIFICATION_BADGING, 1) == 1;
+            mBadgingPref.setSummary(enabled
+                    ? R.string.icon_badging_desc_on
+                    : R.string.icon_badging_desc_off);
+        }
+    }
+
 }