java - EditText 中 TextWatcher 观察器中的 StackOverflow 错误

Question

我正在将金额文本从 EditText 转换为 double 格式，并尝试将 EditText 中的 "," 删除为执行我的计算的正确格式。我的代码有什么问题并且有堆栈溢出吗？

// Gets the two EditText controls' Editable values

String cleanBasicTax;
if(txtBasicTax.getText().toString().contains(",")){
    cleanBasicTax=txtBasicTax.getText().toString().replace(",", "");
}
else{
    cleanBasicTax=txtBasicTax.getText().toString();
}

String cleantxtSurcharge;
if(txtSurcharge.getText().toString().contains(",")){
    cleantxtSurcharge=txtSurcharge.getText().toString().replace(",", "");
}
else{
    cleantxtSurcharge=txtSurcharge.getText().toString();
}

String cleanInterest;
if(txtInterest.getText().toString().contains(",")){
    cleanInterest=txtInterest.getText().toString().replace(",", "");
}
else{
    cleanInterest=txtInterest.getText().toString();
}

String cleanCompromise=txtCompromise.getText().toString().replace(",", "");
if(txtCompromise.getText().toString().contains(",")){
    cleanCompromise=txtCompromise.getText().toString().replace(",", "");
}
else{
    cleanCompromise=txtCompromise.getText().toString();
}           

Editable editableValueBasicTax = txtBasicTax.getText().replace(0, txtBasicTax.length(), cleanBasicTax),
    editableValueSurcharge = txtSurcharge.getText().replace(0, txtSurcharge.length(), cleantxtSurcharge),
    editableValueInterest = txtInterest.getText().replace(0, txtInterest.length(), cleanInterest),
    editableValueCompromise = txtCompromise.getText().replace(0, txtCompromise.length(), cleanCompromise);

Answer 1

您的TextWathcer更改了它正在监视的文本，导致对监视程序的另一次调用，导致对文本的另一次更改，......等等，直到您用完调用方法的堆栈空间。

解决此问题的一种方法是，当您在观察程序内运行时，将 boolean 标志设置为 true，如果该标志设置为终止该标志，则立即返回递归。在伪代码中:

boolean mIsInWatcher = false;

void onTextChanged(...) {
   if (mIsInWatcher) return;
   mIsInWatcher = true;

   // text modifications here

   mIsInWatcher = false;
}