本文介绍了如何创建效果隐藏数字(信用卡号中除最后3个数字以外的数字)的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个问题，我需要一个带有验证的editText，并需要一个效果来隐藏信用卡号，最后三个数字除外.
我戴上了口罩，可以正常工作，但是我需要显示最后三个数字.
如何创建这种效果?
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/creditCard"
android:layout_below="@+id/CVV"
android:inputType="number"
android:digits=" 1234567890"
android:maxLength="16"
android:layout_alignParentStart="true" />
TarjetasBancarias类
public class TarjetasBancarias extends AppCompatActivity {
String a;
int keyDel;
private EditText creditCard;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tarjetas_bancarias);
creditCard = (EditText)findViewById(R.id.creditCard);
creditCard.addTextChangedListener(new CreditCardNumberFormattingTextWatcher());
}
CreditCardNumberFormattingTextWatcher类
public static class CreditCardNumberFormattingTextWatcher implements TextWatcher {
private boolean lock;
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void afterTextChanged(Editable s) {
if (lock || s.length() > 16) {
return;
}
lock = true;
for (int i = 4; i < s.length(); i += 5) {
s.insert(i, "*");
if (s.toString().charAt(i) != ' ') {
s.insert(i, " ");
}
}
lock = false;
}
}
解决方案
我使用PasswordCharSequence解决了我的问题，并复制了一个蒙版
public class TarjetasBancarias extends AppCompatActivity {
private EditText creditCard;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tarjetas_bancarias);
creditCard = (EditText)findViewById(R.id.creditCard);
creditCard.setTransformationMethod(new MyPasswordTransformationMethod());
creditCard.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
boolean flag = true;
String eachBlock[] = creditCard.getText().toString().split("-");
for (int i = 0; i < eachBlock.length; i++) {
if (eachBlock[i].length() > 4) {
flag = false;
}
}
if (flag) {
creditCard.setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_DEL)
keyDel = 1;
return false;
}
});
if (keyDel == 0) {
if (((creditCard.getText().length() + 1) % 5) == 0) {
if (creditCard.getText().toString().split("-").length <= 3) {
creditCard.setText(creditCard.getText() + "-");
creditCard.setSelection(creditCard.getText().length());
}
}
a = creditCard.getText().toString();
} else {
a = creditCard.getText().toString();
keyDel = 0;
}
} else {
creditCard.setText(a);
}
}
@Override
public void afterTextChanged(Editable s) {
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
});
}
public static class MyPasswordTransformationMethod extends PasswordTransformationMethod {
@Override
public CharSequence getTransformation(CharSequence source, View view) {
return new PasswordCharSequence(source);
}
private class PasswordCharSequence implements CharSequence {
private CharSequence mSource;
public PasswordCharSequence(CharSequence source) {
mSource = source;
}
public char charAt(int index) {
char caracter;
switch (index)
{
case 4:
caracter = ' ';
break;
case 9:
caracter = ' ';
break;
case 14:
caracter = ' ';
break;
default:
if(index < 15)
return '*';
else
caracter = mSource.charAt(index);
break;
}
return caracter;
}
public int length() {
return mSource.length();
}
public CharSequence subSequence(int start, int end) {
return mSource.subSequence(start, end);
}
}
};}
I have a problem, I need a editText with validation and a effect hide numbers the credit card except the last 3 numbers..
I have the mask and work fine, but I need show the last 3 numbers.
How can I create this effect?
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/creditCard"
android:layout_below="@+id/CVV"
android:inputType="number"
android:digits=" 1234567890"
android:maxLength="16"
android:layout_alignParentStart="true" />
class TarjetasBancarias
public class TarjetasBancarias extends AppCompatActivity {
String a;
int keyDel;
private EditText creditCard;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tarjetas_bancarias);
creditCard = (EditText)findViewById(R.id.creditCard);
creditCard.addTextChangedListener(new CreditCardNumberFormattingTextWatcher());
}
class CreditCardNumberFormattingTextWatcher
public static class CreditCardNumberFormattingTextWatcher implements TextWatcher {
private boolean lock;
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void afterTextChanged(Editable s) {
if (lock || s.length() > 16) {
return;
}
lock = true;
for (int i = 4; i < s.length(); i += 5) {
s.insert(i, "*");
if (s.toString().charAt(i) != ' ') {
s.insert(i, " ");
}
}
lock = false;
}
}
解决方案
I solved my problem using PasswordCharSequence and aplicate a Mask
public class TarjetasBancarias extends AppCompatActivity {
private EditText creditCard;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tarjetas_bancarias);
creditCard = (EditText)findViewById(R.id.creditCard);
creditCard.setTransformationMethod(new MyPasswordTransformationMethod());
creditCard.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
boolean flag = true;
String eachBlock[] = creditCard.getText().toString().split("-");
for (int i = 0; i < eachBlock.length; i++) {
if (eachBlock[i].length() > 4) {
flag = false;
}
}
if (flag) {
creditCard.setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_DEL)
keyDel = 1;
return false;
}
});
if (keyDel == 0) {
if (((creditCard.getText().length() + 1) % 5) == 0) {
if (creditCard.getText().toString().split("-").length <= 3) {
creditCard.setText(creditCard.getText() + "-");
creditCard.setSelection(creditCard.getText().length());
}
}
a = creditCard.getText().toString();
} else {
a = creditCard.getText().toString();
keyDel = 0;
}
} else {
creditCard.setText(a);
}
}
@Override
public void afterTextChanged(Editable s) {
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
});
}
public static class MyPasswordTransformationMethod extends PasswordTransformationMethod {
@Override
public CharSequence getTransformation(CharSequence source, View view) {
return new PasswordCharSequence(source);
}
private class PasswordCharSequence implements CharSequence {
private CharSequence mSource;
public PasswordCharSequence(CharSequence source) {
mSource = source;
}
public char charAt(int index) {
char caracter;
switch (index)
{
case 4:
caracter = ' ';
break;
case 9:
caracter = ' ';
break;
case 14:
caracter = ' ';
break;
default:
if(index < 15)
return '*';
else
caracter = mSource.charAt(index);
break;
}
return caracter;
}
public int length() {
return mSource.length();
}
public CharSequence subSequence(int start, int end) {
return mSource.subSequence(start, end);
}
}
};}
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