Android EditText Example Method to Limit the Number of Input Integers and Decimals
- 2021-10-13 08:39:06
- OfStack
Direct code
New DecimalInputTextWatcher class inherits TextWatcher (code can be copied directly)
import android.text.Editable;
import android.text.InputFilter;
import android.text.TextWatcher;
import android.widget.EditText;
/**
* EditText Restrict input of integers and decimals Number of digits
* Default Unlimited integer bits, decimal places Maximum 2 Bit
*/
public class DecimalInputTextWatcher implements TextWatcher {
private static final int DEFAULT_DECIMAL_DIGITS = 2;// Default Number of decimal places 2 Bit
private EditText editText;
private int decimalDigits;// Number of decimal places
private int integerDigits;// Number of digits of an integer
public DecimalInputTextWatcher(EditText editText) {
this.editText = editText;
this.decimalDigits = DEFAULT_DECIMAL_DIGITS;
}
public DecimalInputTextWatcher(EditText editText, int decimalDigits) {
this.editText = editText;
if (decimalDigits <= 0)
throw new RuntimeException("decimalDigits must > 0");
this.decimalDigits = decimalDigits;
}
public DecimalInputTextWatcher(EditText editText, int integerDigits, int decimalDigits) {
this.editText = editText;
if (integerDigits <= 0)
throw new RuntimeException("integerDigits must > 0");
if (decimalDigits <= 0)
throw new RuntimeException("decimalDigits must > 0");
this.decimalDigits = decimalDigits;
this.integerDigits = integerDigits;
}
@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) {
String s = editable.toString();
editText.removeTextChangedListener(this);
if (s.contains(".")) {
if (integerDigits > 0) {
editText.setFilters(new InputFilter[]{new InputFilter.LengthFilter(integerDigits + decimalDigits + 1)});
}
if (s.length() - 1 - s.indexOf(".") > decimalDigits) {
s = s.substring(0,
s.indexOf(".") + decimalDigits + 1);
editable.replace(0, editable.length(), s.trim());// Do not enter numbers that exceed the number of digits
}
} else {
if (integerDigits > 0) {
editText.setFilters(new InputFilter[]{new InputFilter.LengthFilter(integerDigits + 1)});
if (s.length() > integerDigits) {
s = s.substring(0, integerDigits);
editable.replace(0, editable.length(), s.trim());
}
}
}
if (s.trim().equals(".")) {// Beginning with decimal point, supplemented before decimal point 0
s = "0" + s;
editable.replace(0, editable.length(), s.trim());
}
if (s.startsWith("0") && s.trim().length() > 1) {// Multiple 0 At the beginning, only enter 1 A 0
if (!s.substring(1, 2).equals(".")) {
editable.replace(0, editable.length(), "0");
}
}
editText.addTextChangedListener(this);
}
}
Use
editText.addTextChangedListener(new DecimalInputTextWatcher(weight, 3, 5));
// Limit number of input digits: integer 3 Two decimal places