如果你只是想在视觉上将数字进行分组,但不想改变EditText
的值并添加破折号,可以使用这种Span
方法:
EditText editText = findViewById(R.id.editText);
editText.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {}
@Override
public void afterTextChanged(Editable editable) {
Object[] paddingSpans = editable.getSpans(0, editable.length(), DashSpan.class);
for (Object span : paddingSpans) {
editable.removeSpan(span);
}
addSpans(editable);
}
private static final int GROUP_SIZE = 4;
private void addSpans(Editable editable) {
final int length = editable.length();
for (int i = 1; i * (GROUP_SIZE) < length; i++) {
int index = i * GROUP_SIZE;
editable.setSpan(new DashSpan(), index - 1, index,
Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}
});
其中 DashSpan
类的代码如下:
public class DashSpan extends ReplacementSpan {
@Override
public int getSize(@NonNull Paint paint, CharSequence text, int start, int end, FontMetricsInt fm) {
float padding = paint.measureText("-", 0, 1);
float textSize = paint.measureText(text, start, end);
return (int) (padding + textSize);
}
@Override
public void draw(@NonNull Canvas canvas, CharSequence text, int start, int end, float x, int top, int y,
int bottom, @NonNull Paint paint) {
canvas.drawText(text.subSequence(start, end) + "-", x, y, paint);
}
}
这样,您将通过破折号在视觉上进行分组,但
getText()
将返回没有任何分组的文本。
要强制仅输入数字,您可以将属性
android:digits="0123456789"
和
android:inputType="number"
添加到
EditText
中。
此解决方案基于
此库的代码。