private void getResult() {
        tvHeight.setText(String.format("身高:%.2f CM",height));
        tvWeight.setText(String.format("體重:%.2f KG",weight));
        bmi=weight / ((height/100)*(height/100));
        tvBmi.setText(String.format("BMI:%.2f",bmi));
        String result;

        if(bmi>=35){
            result="重度肥胖";
            photoId=0;
        } else if(bmi>=30){
            result="中度肥胖";
            photoId=1;
        }else if(bmi>=27){
            result="輕度肥胖";
            photoId=2;
        }else if(bmi>=24){
            result="過重";
            photoId=3;
        }else if(bmi>=18.5){
            result="標準體重";
            photoId=4;
        }else{
            result="體重過輕";
            photoId=5;
        }
        tvResult.setText(result);
}