-1
我真的不確定爲什麼會出現此錯誤。這可能很簡單,但我是新手。運算符*未定義爲參數類型double,EditText
final Button calculate = (Button) findViewById(R.id.calculate);
calculate.setOnClickListener(new View.OnClickListener() {
// Implement the OnClickListener callback
private void onClick(Button calculate) {
double perimeter = 2 * (Math.PI * entry); //error on this line
System.out.print(perimeter);
}
public void onClick(View v) {
// TODO Auto-generated method stub
}
}
);
什麼是項的類型? – perreal 2012-02-11 05:02:56
'onClick'方法接收參數的原因是什麼? – Mahesh 2012-02-11 05:03:22