我在这里不太了解您的问题:只需删除代码的这一部分

I don't really understand your problem here: Just remove this part of your code

{
   Object.keys(this.state.cars).map( (carId, index) => (
      <TouchableOpacity key={index} onPress={() => this.setState({ selectedId: carId})}>
         <Text>{`${carId}: ${JSON.stringify(this.state.cars[carId])}`}</Text>
      </TouchableOpacity>
   )
}

并替换为:

{
   Object.keys(this.state.cars).map( (carId, index) => (
         <Text style={{color: this.state.cars[carId].color}}>hi !</Text>
   )
}