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我正在寫一個簡單的應用程序,它允許用戶輸入他們的收入和扣除它的稅收,然後將其保存以供將來參考文件的數量。問題是,如果我嘗試在'postTax'editText中輸入任何內容,它會拋出最後一個異常。我顯然是在用我的邏輯做一些愚蠢的事情,但是誰能看到這個問題?Android應用程序捕獲不必要的異常
public void onClick(View v) {
// TODO Auto-generated method stub
try {
if (preTax !=null){
Double incomeAmount = Double.parseDouble(preTax.getText().toString());
incomeAmount = incomeAmount - (0.2 *incomeAmount);
Double incomeRounded = Round(incomeAmount);
Toast.makeText(v.getContext(), "Your income minus tax = "+incomeRounded, Toast.LENGTH_LONG).show();
String storeIncome = Double.toString(incomeRounded);
try{
FileOutputStream fos = openFileOutput("income", Context.MODE_PRIVATE);
OutputStreamWriter osw = new OutputStreamWriter(fos);
osw.write(storeIncome);
osw.flush();
osw.close();
} catch(Exception e){
Toast.makeText(this, "Error writing to file", Toast.LENGTH_LONG).show();
}
}
else if (postTax!=null){
Double incomeAmount = Double.parseDouble(postTax.getText().toString());
Double incomeRounded = Round(incomeAmount);
Toast.makeText(v.getContext(), "Your income is: "+ incomeRounded, Toast.LENGTH_LONG).show();
String storeIncome = Double.toString(incomeRounded);
try{
FileOutputStream fos = openFileOutput("income", Context.MODE_PRIVATE);
OutputStreamWriter osw = new OutputStreamWriter(fos);
osw.write(storeIncome);
osw.flush();
osw.close();
} catch(Exception e){
Toast.makeText(this, "Error writing to file", Toast.LENGTH_LONG).show();
}
}
} catch (Exception e){
Toast.makeText(v.getContext(), "Please fill in the relevant catagories", Toast.LENGTH_LONG).show();
}
啊!你是對的。我不明白這是爲什麼造成但是一個NumberFormatException異常,我輸入的數據是相同的稅前和不拋出異常? – user650309
通過的邏輯你的'if'構建體,所述'postTax'部分將不會被即使有一個'preTax'變量集(其,我假設,是參考一些'EditText')執行。考慮到這一點,這可能是您的代碼意外/錯誤行爲的主要原因。 – Xion