FB: Volume panel background color && transparency [2/2]

Allow user to specify background color and transparency level
    for volume panel.

PS: color now applies instantaneously after setting the preference.
Change-Id: I23a09d302fe090fe4aed6dd9024c73056d14fba1

core/java/android/provider/Settings.java

@@ -2047,6 +2047,13 @@ public static void setShowGTalkServiceStatusForUser(ContentResolver cr, boolean
         /** @hide */
         public static final int VOLUME_OVERLAY_NONE = 3;
 
+        /**
+         * Volume panel background color
+         *
+         * @hide
+         */
+        public static final String VOLUME_PANEL_BG_COLOR = "volume_panel_bg_color";
+
         /**
          * Whether the torch will pulse on incoming call
          * @hide

core/java/android/view/VolumePanel.java

@@ -29,6 +29,7 @@
 import android.content.IntentFilter;
 import android.content.res.Resources;
 import android.database.ContentObserver;
+import android.graphics.drawable.Drawable;
 import android.media.AudioManager;
 import android.media.AudioService;
 import android.media.AudioSystem;
@@ -118,6 +119,8 @@ public class VolumePanel extends Handler implements OnSeekBarChangeListener, Vie
     private boolean mVoiceCapable;
     private boolean mVolumeLinkNotification;
     private int mCurrentOverlayStyle = -1;
+    private Drawable defaultBackground;
+    private int mPanelColor;
 
     // True if we want to play tones on the system stream when the master stream is specified.
     private final boolean mPlayMasterStreamTones;
@@ -236,6 +239,7 @@ public void onChange(boolean selfChange) {
                     Settings.System.MODE_VOLUME_OVERLAY, VOLUME_OVERLAY_EXPANDABLE,
                     UserHandle.USER_CURRENT);
             changeOverlayStyle(overlayStyle);
+            setColor();
         }
     };
 
@@ -359,14 +363,17 @@ public void onDismiss(DialogInterface dialog) {
         context.getContentResolver().registerContentObserver(
                 Settings.System.getUriFor(Settings.System.MODE_VOLUME_OVERLAY), false,
                 mSettingsObserver, UserHandle.USER_ALL);
-
+        context.getContentResolver().registerContentObserver(
+                Settings.System.getUriFor(Settings.System.VOLUME_PANEL_BG_COLOR), false,
+                mSettingsObserver, UserHandle.USER_ALL);
         boolean masterVolumeKeySounds = mContext.getResources().getBoolean(
                 com.android.internal.R.bool.config_useVolumeKeySounds);
 
         mPlayMasterStreamTones = useMasterVolume && masterVolumeKeySounds;
 
         mMoreButton.setOnClickListener(this);
         listenToRingerMode();
+        setColor();
     }
 
     private void changeOverlayStyle(int newStyle) {
@@ -417,10 +424,31 @@ public void setTheme() {
         // Force reload the background (to do not get the old cached one)
         // and update the states.
         mPanel.setBackgroundResource(R.color.transparent);
-        mPanel.setBackgroundResource(R.drawable.dialog_full_holo_dark);
+        setColor();
         updateStates();
     }
 
+    private void setColor() {
+        ContentResolver resolver = mContext.getContentResolver();
+
+        defaultBackground = mContext.getResources().getDrawable(
+            R.drawable.dialog_full_holo_dark).getCurrent();
+        mPanelColor = Settings.System.getIntForUser(resolver,
+                Settings.System.VOLUME_PANEL_BG_COLOR, -2, UserHandle.USER_CURRENT);
+
+        if (mPanelColor == Integer.MIN_VALUE
+            || mPanelColor == -2) {
+            // Flag to reset volume panel background color
+            mPanel.setBackground(defaultBackground);
+        } else {
+            if (mPanelColor != 0x00ffffff) {
+                mPanel.setBackgroundColor(mPanelColor);
+            } else {
+                mPanel.setBackgroundResource(R.drawable.dialog_full_holo_dark);
+            }
+        }
+    }
+
     private void listenToRingerMode() {
         final IntentFilter filter = new IntentFilter();
         filter.addAction(AudioManager.RINGER_MODE_CHANGED_ACTION);