[英]Android Studio Select item from SQLite database by spinner selection
[英]Spinner Item Selection - Android Studio
嗨,大家好,我在选择微调器项目时遇到了麻烦。 这个概念是卡路里计算器,我在下面放置的当前代码是用于计算动作以及旋转监听器的按钮。 我已经测试了用户输入是否正常,还测试了微调字符串等于什么,但是它没有将我的if语句设置为true。 有人可以启发我解决什么问题吗?
enum Discount {
STEAK(2.71f),
CHICKEN(2.39f),
PORK(2.42f),
HAM(1.45f),
VEAL(1.72f),
WHITEFISH(1.72f),
SALMON(2.08f);
private float amount;
Discount(float amount) {
this.amount = amount;
}
}
dropDownList.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
itemSelectedDiscount = dropDownList.getSelectedItem().toString();
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
Button calculate = (Button)findViewById(R.id.calculate);
calculate.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
totalCaloriesInt = value;
status.setText(itemSelectedDiscount);
if (itemSelectedDiscount == "STEAK") {
Discount steak = Discount.STEAK;
calculatedCalories.setText("" + totalCaloriesInt * steak.amount);
}
else if (itemSelectedDiscount == "CHICKEN") {
Discount chicken = Discount.CHICKEN;
calculatedCalories.setText("" + totalCaloriesInt * chicken.amount);
}
}
});
`
我看不到所有代码,但我想您应该在if条件中使用string.equals(Object other)而不是“ ==”运算符。
(itemSelectedDiscount.equals("STEAK"))
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.