flutter插件color_picker

// create some value
Color pickerColor = Color(0xff443a49);
Color currentColor = Color(0xff443a49);
ValueChanged<Color> onColorChanged;

// bind some values with [ValueChanged<Color>] callback
changeColor(Color color) {
  setState(() => pickerColor = color);
}

// raise the [showDialog] widget
showDialog(
  context: context,
  child: AlertDialog(
    title: const Text('Pick a color!'),
    content: SingleChildScrollView(
      child: ColorPicker(
        pickerColor: pickerColor,
        onColorChanged: changeColor,
        enableLabel: true,
        pickerAreaHeightPercent: 0.8,
      ),
      // Use Material color picker
      // child: MaterialPicker(
      //   pickerColor: pickerColor,
      //   onColorChanged: changeColor,
      //   enableLabel: true, // only on portrait mode
      // ),
      //
      // Use Block color picker
      // child: BlockPicker(
      //   pickerColor: currentColor,
      //   onColorChanged: changeColor,
      // ),
    ),
    actions: <Widget>[
      FlatButton(
        child: Text('Got it'),
        onPressed: () {
          setState(() => currentColor = pickerColor);
          Navigator.of(context).pop();
        },
      ),
    ],
  ),
)