我会在此代码中添加一个EditText控件,以便它只接受十六进制数字。 我该怎么做呢?
bin = (EditText)findViewById(R.id.editText02);
hex = (EditText)findViewById(R.id.editText3);
dec = (EditText)findViewById(R.id.editText1);
oct = (EditText)findViewById(R.id.editText04);
答案 0 :(得分:39)
在Android布局XML文件中,将以下属性添加到EditText:
<EditText
android:digits="0123456789ABCDEF"
android:inputType="textCapCharacters"
/>
第一个属性仅允许输入这些数字。任何其他输入被拒绝且不显示。第二个属性将字符大写。
归功于此博文: http://mobile.antonio081014.com/2012/04/how-to-let-input-of-edittext-only-be.html
答案 1 :(得分:3)
TextWatcher也是不错的选择,但我更喜欢使用自定义过滤器。 因此,更简单的方法是使用InputFilter并动态控制每个char,请参见下面的示例,希望这有帮助
import android.text.InputFilter;
import android.text.InputType;
EditText input_moodMsg;
// initialize this edittext etc etc
//....
// here comes the filter to control input on that component
InputFilter inputFilter_moodMsg = new InputFilter() {
@Override
public CharSequence filter(CharSequence source, int start, int end,Spanned dest, int dstart, int dend) {
if (source.length()>44) return "";// max 44chars
// Here you can add more controls, e.g. allow only hex chars etc
for (int i = start; i < end; i++) {
if (!Character.isLetterOrDigit(source.charAt(i)) && !Character.isSpaceChar(source.charAt(i))
&& source.charAt(i)!='-'
&& source.charAt(i)!='.'
&& source.charAt(i)!='!'
) {
return "";
}
}
return null;
}
};
input_moodMsg.setFilters(new InputFilter[] { inputFilter_moodMsg });
input_moodMsg.setInputType(InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
答案 2 :(得分:0)
有两个选项,其中一个由Muhammad Annaqeeb使用属性来描述:
<EditText
android:id="@+id/myTextView"
android:digits="0123456789ABCDEF"
android:inputType="textCapCharacters"/>
另一种选择是使用InputFilter和REGEX来仅允许十六进制字符:
EditText myTextField = (EditText) findViewById(R.id.myTextView);
InputFilter inputFilterText = new InputFilter() {
@Override
public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
Pattern patern = Pattern.compile("^\\p{XDigit}+$");
StringBuilder sb = new StringBuilder();
for (int i = start; i < end; i++) {
if (!Character.isLetterOrDigit(source.charAt(i)) && !Character.isSpaceChar(source.charAt(i)) ) {
//is not(Letter or Digit or space);
return "";
}
//Only allow characters "0123456789ABCDEF";
Matcher matcher = patern.matcher(String.valueOf(source.charAt(i)));
if (!matcher.matches()) {
return "";
}
//Add character to Strinbuilder
sb.append(source.charAt(i));
/*counterForSpace++;
if(counterForSpace>1){
//Restar counter contador
counterForSpace = 0;
//Add space!
sb.append(" ");
}*/
}
//Return text in UpperCase.
return sb.toString().toUpperCase();
}
};
myTextField.setFilters(new InputFilter[] { inputFilterText });
myTextField.setInputType(InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
这两个选项的结果是:
也检查此相关答案: