Java 从 EditText 到浮动的字符串
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String from EditText to float
提问by Espen
I have an EditText for which will be using for a float number. So I'm trying to read the text from the EditText and put it into a float variable. But I seem to have a text to float problem. This is the line I have:
我有一个将用于浮点数的 EditText。所以我试图从 EditText 读取文本并将其放入浮点变量中。但我似乎有一个文本浮动问题。这是我的线路：
float Number = ( ( EditText )findViewById( R.id.edit_float ) ).getText();
I've tried using Float.parseFloat(string) and just general casting, but nothing seem to do it. What can I do here? Also, is there a way to check for a valid float number before writing it to a variable?
我试过使用 Float.parseFloat(string) 和一般的转换，但似乎没有任何作用。我可以在这里做什么？另外，有没有办法在将浮点数写入变量之前检查有效的浮点数？
采纳答案by Octavian A. Damiean
Try this.
尝试这个。
EditText edt = (EditText) findViewById(R.id.edit_float);
float number = Float.valueOf(edt.getText().toString());
You use the valueOf()method if the Floatwrapper class to convert a string to a float. IN this example I get the Editableobject of that EditTextwith getText()on which I call the toString()method to obtain a string from it.
valueOf()如果Float包装类将字符串转换为浮点数，则使用该方法。在这个例子中，我得到Editable的是物体EditText与getText()上我所说的toString()方法从中获得一个字符串。
Update:Totally right guys sorry. Time to increment my sheep counter.
更新：完全正确的人抱歉。是时候增加我的羊计数器了。
回答by Daniel
float getFloatFrom(EditText txt) {
try {
return NumberFormat.getInstance().parse(txt.getText().toString()).floatValue();
} catch (ParseException e) {
return 0.0f;
}
}
Do NOT use Float.valueOf() if you want the code to work in countries that use decimal comma instead of decimal point.
如果您希望代码在使用十进制逗号而不是小数点的国家/地区工作，请不要使用 Float.valueOf()。
