我做了一个简单的货币转换器，但有没有一种简单的方法来检索实时货币（只是货币，比如从以色列谢克尔到美元）？例如：
case R.id.euro:
mDollar.setChecked(false);
Meuro.setChecked(true);
exchangeRate = **//live currency from external source**
exchangeSymbol = "€";
break;
这是我的整个代码
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mResult = (TextView) findViewById(R.id.result);
mToConvert = (EditText) findViewById(R.id.toConvert);
mRadioGroup = (RadioGroup) findViewById(R.id.radioG);
mDollar = (RadioButton) findViewById(R.id.dollar);
Meuro = (RadioButton) findViewById(R.id.euro);
mToConvert.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1,
int arg2, int arg3) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable arg0) {
convertCurrentAmount();
}
});
mRadioGroup
.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
convertCurrentAmount();
}
});
}
public void convertCurrentAmount() {
double exchangeRate = -1;
String exchangeSymbol = null;
switch (mRadioGroup.getCheckedRadioButtonId()) {
case R.id.dollar:
mDollar.setChecked(true);
Meuro.setChecked(false);
exchangeRate = 3.76;
exchangeSymbol = "$";
break;
case R.id.euro:
mDollar.setChecked(false);
Meuro.setChecked(true);
exchangeRate = 5;
exchangeSymbol = "€";
break;
}
if (exchangeRate > 0 && exchangeSymbol != null) {
Double stringtoint = Double
.valueOf(mToConvert.getText().toString());
double result = stringtoint * exchangeRate;
mResult.setText("" + exchangeSymbol + result);
}
}
}