先上效果图：
editText.setFilters(new InputFilter[]{new NumberDecimalFilter().setDigits(1)});
直接在代码里面设置setFilters，setDigits就填1，
xml代码
Activity 里面使用
NumberDecimalFilter 自定义过滤器
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.text.method.DigitsKeyListener;
public class NumberDecimalFilter extends DigitsKeyListener {
public NumberDecimalFilter() {
super(false, true);
}
private int digits =2;
public NumberDecimalFiltersetDigits(int d) {
digits = d;
return this;
}
@Override
public CharSequencefilter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
CharSequence out =super.filter(source, start, end, dest, dstart, dend);
if (out !=null) {
source = out;
start =0;
end = out.length();
}
int len = end - start;
if (len ==0) {
return source;
}
//以点开始的时候，自动在前面添加0
if (source.toString().equals(".") && dstart ==0) {
return "0.";
}
//如果起始位置为0,且第二位跟的不是".",则无法后续输入
if (!source.toString().equals(".") && dest.toString().equals("0")) {
return "";
}
int dlen = dest.length();
for (int i =0; i < dstart; i++) {
if (dest.charAt(i) =='.') {
return (dlen - (i +1) + len >digits) ?
"" :
new SpannableStringBuilder(source, start, end);
}
}
for (int i = start; i < end; ++i) {
if (source.charAt(i) =='.') {
if ((dlen - dend) + (end - (i +1)) >digits)
return "";
else
break;
}
}
return new SpannableStringBuilder(source, start, end);
}
}