我将在此代码中放入 EditText 上的控件,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);
我将在此代码中放入 EditText 上的控件,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);
在您的 android 布局 XML 文件中,将以下属性添加到 EditText:
<EditText
android:digits="0123456789ABCDEF"
android:inputType="textCapCharacters"
/>
第一个属性只允许输入这些数字。任何其他输入都将被拒绝且不显示。第二个属性将字符大写。
归功于这篇博文:http: //mobile.antonio081014.com/2012/04/how-to-let-input-of-edittext-only-be.html
有两种选择,一种是 Muhammad Annaqeeb 使用属性描述的:
<EditText
android:id="@+id/myTextView"
android:digits="0123456789ABCDEF"
android:inputType="textCapCharacters"/>
其他选项将使用InputFilter和 REGEX 只允许十六进制字符:
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);
结果,这两个选项都有:
也检查这个相关的答案:
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 并即时控制每个字符,请参见下面的示例,希望这会有所帮助
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);