java – Android afterTextChanged不会在每4个字符后输入一个空格
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我正在尝试设计一个简单的信用卡/借记卡表单.我有一个cardNumber EditText字段.当用户开始输入时,我希望我的应用程序在每4个数字后插入一个空格.我从this教程中获得了帮助并进行了一些修改,但它没有用.每4位数后它不会进入空格.
MainActivity.java
package *************************
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.text.Editable;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.view.KeyEvent;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.EditText;
import java.security.Key;
public class MainActivity extends AppCompatActivity {
private EditText cardNumber, expiryDate, CVV, nameOnCard;
private boolean flag = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LOCKED);//Locks the screen orientation
init(); //Initializes the variables
typefunc();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void init()
{
cardNumber = (EditText) findViewById(R.id.cardNumber); //Field for storing the card number
expiryDate = (EditText) findViewById(R.id.expiryDate); //For storing the Expiry Date
CVV = (EditText) findViewById(R.id.CVV); //For storing the CVV
nameOnCard = (EditText) findViewById(R.id.nameOnCard); //For storing the name of the Cardholder
}
public void typefunc()
{
cardNumber.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)
{
if(s.length()==16)
{
expiryDate.setVisibility(View.VISIBLE);
expiryDate.requestFocus();
CVV.setVisibility(View.VISIBLE);
}
}
@Override
public void afterTextChanged(Editable s)
{
char space = ' ';
if (s.length() > 0 && (s.length() % 5) == 0)
{
char c = s.charAt(s.length() - 1);
if (Character.isDigit(c))
{
s.insert(s.length() - 1, String.valueOf(space));
}
}
}
});
expiryDate.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)
{
if(s.length()==6)
CVV.requestFocus();
}
@Override
public void afterTextChanged(Editable s) {
}
});
CVV.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)
{
if(s.length()==3) {
nameOnCard.setVisibility(View.VISIBLE);
}
}
@Override
public void afterTextChanged(Editable s)
{
if(s.length()==3)
nameOnCard.requestFocus();
}
});
}
}
解决方法:
这工作正常
editText.addTextChangedListener(new TextWatcher() {
private static final char space = ' ';
@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 s) {
// Remove spacing char
if (s.length() > 0 && (s.length() % 5) == 0) {
final char c = s.charAt(s.length() - 1);
if (space == c) {
s.delete(s.length() - 1, s.length());
}
}
// Insert char where needed.
if (s.length() > 0 && (s.length() % 5) == 0) {
char c = s.charAt(s.length() - 1);
// Only if its a digit where there should be a space we insert a space
if (Character.isDigit(c) && TextUtils.split(s.toString(), String.valueOf(space)).length <= 3) {
s.insert(s.length() - 1, String.valueOf(space));
}
}
}
});
并且不要忘记将以下属性添加到edittext
android:inputType="phone" android:maxLength="19"
希望这可以帮助 :)
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