(cherry picked from commit e6d7aa75)

(cherry picked from commit f74bd90a)

(cherry picked from commit 4aa65b72)

Works only for Android 6+

Close #464

(cherry picked from commit 5c7e37cc)

(cherry picked from commit 588c521d)

(cherry picked from commit 04b12baa)

(cherry picked from commit 632ad6e1)

(cherry picked from commit 16ea561c)

(cherry picked from commit 5a714e40)

(cherry picked from commit 117db707)

(cherry picked from commit dd9e6136)

(cherry picked from commit b4abf53a)

(cherry picked from commit 204e2d2a)

(cherry picked from commit 879998f0)

(cherry picked from commit 918d874e)

(cherry picked from commit 2bcb8ed0)

As audio focus loss is only transient, there is no reason to remove
service from foreground

(cherry picked from commit ce42f463)

(cherry picked from commit 5dc7a3f3)

(cherry picked from commit e6def1b6)

(cherry picked from commit ad2f5322)

(cherry picked from commit 19c48050)

(cherry picked from commit 94b38b61)

Leave the whole action bar empty for filter edit text.

(cherry picked from commit 97b402e9)

(cherry picked from commit 8079f20a)

(cherry picked from commit 92a9efb3)

(cherry picked from commit 1e59c419)

(cherry picked from commit afe6a922)

(cherry picked from commit e57e5247)

(cherry picked from commit 500289eb)

(cherry picked from commit 642768da)

(cherry picked from commit c70ae7c7)

(cherry picked from commit e5c8994c)