EditText限制只输入数字和小数点/扩展：限制两位小数

1.EditText限制输入只输入数字和小数点

https://www.jianshu.com/p/adff061b71e6

      editTotalAmount.setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_DECIMAL);
        editSecondAmount.setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_DECIMAL);

2.EditText限制输入两位小数

https://www.jianshu.com/p/dc2419de0abf
工具类:

public class MoneyTextWatcher  implements TextWatcher {
    private EditText editText;
    private int digits = 2;

    public MoneyTextWatcher(EditText et) {
        editText = et;
    }
    public MoneyTextWatcher setDigits(int d) {
        digits = d;
        return this;
    }


    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {

    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        //删除“.”后面超过2位后的数据
        if (s.toString().contains(".")) {
            if (s.length() - 1 - s.toString().indexOf(".") > digits) {
                s = s.toString().subSequence(0,
                        s.toString().indexOf(".") + digits+1);
                editText.setText(s);
                editText.setSelection(s.length()); //光标移到最后
            }
        }
        //如果"."在起始位置,则起始位置自动补0
        if (s.toString().trim().substring(0).equals(".")) {
            s = "0" + s;
            editText.setText(s);
            editText.setSelection(2);
        }

        //如果起始位置为0,且第二位跟的不是".",则无法后续输入
        if (s.toString().startsWith("0")
                && s.toString().trim().length() > 1) {
            if (!s.toString().substring(1, 2).equals(".")) {
                editText.setText(s.subSequence(0, 1));
                editText.setSelection(1);
                return;
            }
        }
    }

    @Override
    public void afterTextChanged(Editable s) {

    }

}

使用方法->在1的基础上：

        editTotalAmount.setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_DECIMAL);
        editSecondAmount.setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_DECIMAL);

        editTotalAmount.addTextChangedListener(new MoneyTextWatcher(editTotalAmount));
        editSecondAmount.addTextChangedListener(new MoneyTextWatcher(editSecondAmount));

//手动设置其他位数，例如3
        editSecondAmount.addTextChangedListener(new MoneyTextWatcher(editSecondAmount).setDigits(3));