QuickSettingsTileService.java 文件源码

private void updateState() {
    Tile tile = getQsTile();
    if(tile != null) {
        SharedPreferences pref = U.getSharedPreferences(this);
        tile.setIcon(Icon.createWithResource(this, pref.getBoolean("app_drawer_icon", false)
                ? R.drawable.ic_system
                : R.drawable.ic_allapps));

        if(U.canDrawOverlays(this))
            tile.setState(U.isServiceRunning(this, NotificationService.class)
                    ? Tile.STATE_ACTIVE
                    : Tile.STATE_INACTIVE);
        else
            tile.setState(Tile.STATE_UNAVAILABLE);

        tile.updateTile();
    }
}