Please upgrade the icon of this app to conform to Material Design. The rest of this app already complies with Material Design. The icon has a bit too much details and looks therefore cheap. A more minimal icon will communicate a stable and well thought image. Perhaps make a small contest amongst the people here to suggest one.
You’re always free to suggest a new icon.
As you want to portray a systemlike function the blue is a good color. However, the current colors blue are not according to what is listed in https://www.google.com/design/spec/style/color.html#color-color-palette or http://www.materialui.co/colors
To stick to some basics and color which can have white text or symbols over it, I would advise for blue #2196F3 as the background for the caption of the app and the background for the toggles. For the background in the notification area and the inactive toggles, I would advise indigo #3F51B5. For the active toggle, red underline and ±button, use red #F44336 since it is not so hard as the current color.
Talking about more adherence to Material Design, the color picker could be replaced by one that offers only the colors from the links mentioned earlier. For Android, several standard color pickers exist. The one used now allows for all color but in practise is not so handy. Here https://github.com/dmfs/opentasks/blob/master/opentasks/src/main/AndroidManifest.xml#L345 is an example of a practical color picker. People can easily find the same color again in this way. For the grey text, please use #757575 as that has good contrast with white background
I saw that in the menu sync has a dot behind it “sync.” This dot can be omitted as sync and syncing are now common words.
Proposition for an icon according to Material Design is https://i.imgur.com/9HUCEKF.png I can email you the SVG file if you want.
