Fix some Bluetooth settings bugs.

- Remove BluetoothFindNearby.java (no longer used)
- Show message when Bluetooth is turning off
- Fix case where device name sometimes didn't show when turning BT on
- Disable "Rename device" and "Visibility timeout" menus when BT is off
- Remove "Got onDeviceAdded, but cachedDevice already exists" log message
- Never show "Rename device" in action menu (bug 5064378)
- Show discovery time remaining as "m:ss", not "mm:ss" (bug 5064104)

Bug: 5064378
Bug: 5064104
Change-Id: I79609dfdad61993a28cff64c9e082870ff74d180

src/com/android/settings/bluetooth/BluetoothDiscoverableEnabler.java

@@ -144,12 +144,24 @@ final class BluetoothDiscoverableEnabler implements Preference.OnPreferenceClick
         if (getDiscoverableTimeout() == DISCOVERABLE_TIMEOUT_NEVER) {
             mDiscoveryPreference.setSummary(R.string.bluetooth_is_discoverable_always);
         } else {
-            String textTimeout = DateUtils.formatElapsedTime(timeout);
+            String textTimeout = formatTimeRemaining(timeout);
             mDiscoveryPreference.setSummary(mContext.getString(R.string.bluetooth_is_discoverable,
                     textTimeout));
         }
     }
 
+    private static String formatTimeRemaining(int timeout) {
+        StringBuilder sb = new StringBuilder(6);    // "mmm:ss"
+        int min = timeout / 60;
+        sb.append(min).append(':');
+        int sec = timeout - (min * 60);
+        if (sec < 10) {
+            sb.append('0');
+        }
+        sb.append(sec);
+        return sb.toString();
+    }
+
     void setDiscoverableTimeout(int index) {
         String timeoutValue;
         switch (index) {