AndroidManifest: Make SingleActivity translucent

Signed-off-by: Peter Cai <xqsx43cxy@126.com>
SingleActivity: Do not auto-expand

Signed-off-by: Peter Cai <xqsx43cxy@126.com>
MainActivity: Show search as action

Signed-off-by: Peter Cai <xqsx43cxy@126.com>
MainActivity: [TEST] add cover image

Signed-off-by: Peter Cai <xqsx43cxy@126.com>