自定义格式编辑文本输入android接受信用卡号

Question

如何使编辑文本接受格式的输入

4digitnumber-4dignumber-4dignumber-4dignumber   

代码

text.addTextChangedListener(new TextWatcher() {
    int len = 0;
    String string ;
    @Override

    public void afterTextChanged(Editable s) {

        text.setOnKeyListener(new OnKeyListener()
        {   public boolean onKey(View v, int keyCode, KeyEvent event)
            {              
                    if (keyCode == KeyEvent.KEYCODE_DEL)
                    {

                    }
                    else{

                        string = text.getText().toString();
                        len = string.length()+1;
                        if(len%5==0){text.append("-");}

             }

                return false;      }   });
    }
});

添加时工作正常,但删除或编辑会导致问题.

Answer 1

现在这适用于所有删除/编辑操作的软/硬键盘.tx 4你的帮助..

package com.and;

import android.app.Activity;
import android.app.AlertDialog;
import android.inputmethodservice.KeyboardView;
import android.os.Bundle;
import android.telephony.PhoneNumberFormattingTextWatcher;
import android.text.Editable;
import android.text.Selection;
import android.text.Spannable;
import android.text.TextWatcher;
import android.text.format.Formatter;
import android.text.method.NumberKeyListener;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnKeyListener;
import android.widget.EditText;
import android.widget.Toast;

public class ccformat extends Activity {

    String a;
    int keyDel;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        final EditText text = (EditText) findViewById(com.and.R.id.editText1);

        text.addTextChangedListener(new TextWatcher() {

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {

                boolean flag = true;
                String eachBlock[] = text.getText().toString().split("-");
                for (int i = 0; i < eachBlock.length; i++) {
                    if (eachBlock[i].length() > 4) {
                        flag = false;
                    }
                }
                if (flag) {

                    text.setOnKeyListener(new OnKeyListener() {

                        @Override
                        public boolean onKey(View v, int keyCode, KeyEvent event) {

                            if (keyCode == KeyEvent.KEYCODE_DEL)
                                keyDel = 1;
                            return false;
                        }
                    });

                    if (keyDel == 0) {

                        if (((text.getText().length() + 1) % 5) == 0) {

                            if (text.getText().toString().split("-").length <= 3) {
                                text.setText(text.getText() + "-");
                                text.setSelection(text.getText().length());
                            }
                        }
                        a = text.getText().toString();
                    } else {
                        a = text.getText().toString();
                        keyDel = 0;
                    }

                } else {
                    text.setText(a);
                }

            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count,
                    int after) {
                // TODO Auto-generated method stub

            }

            @Override
            public void afterTextChanged(Editable s) {
            }
        });
    }
}

Answer 2

这是有效的:

public class EditTextSample extends Activity {
    // This regexp has to be improved, it does not detect case where you have
    // more than 4 digits in a middle group like: 1234-12345-123
    static final Pattern CODE_PATTERN = Pattern.compile("([0-9]{0,4})|([0-9]{4}-)+|([0-9]{4}-[0-9]{0,4})+");

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.edit_text_sample);

        final EditText editText = (EditText) findViewById(R.id.input);
        editText.addTextChangedListener(new TextWatcher() {

            @Override
            public void afterTextChanged(Editable s) {
                Log.w("", "input" + s.toString());

                if (s.length() > 0 && !CODE_PATTERN.matcher(s).matches()) {
                    String input = s.toString();
                    String numbersOnly = keepNumbersOnly(input);
                    String code = formatNumbersAsCode(numbersOnly);

                    Log.w("", "numbersOnly" + numbersOnly);
                    Log.w("", "code" + code);

                    editText.removeTextChangedListener(this);
                    editText.setText(code);
                    // You could also remember the previous position of the cursor
                    editText.setSelection(code.length());
                    editText.addTextChangedListener(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) {
            }

            private String keepNumbersOnly(CharSequence s) {
                return s.toString().replaceAll("[^0-9]", ""); // Should of course be more robust
            }

            private String formatNumbersAsCode(CharSequence s) {
                int groupDigits = 0;
                String tmp = "";
                for (int i = 0; i < s.length(); ++i) {
                    tmp += s.charAt(i);
                    ++groupDigits;
                    if (groupDigits == 4) {
                        tmp += "-";
                        groupDigits = 0;
                    }
                }
                return tmp;
            }
        });
    }
}

Answer 3

如果您只想对数字进行可视化分组，但不想更改EditText添加破折号的值，则可以使用以下Span方法：

EditText editText = findViewById(R.id.editText);
editText.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) {}

    @Override
    public void afterTextChanged(Editable editable) {
        Object[] paddingSpans = editable.getSpans(0, editable.length(), DashSpan.class);
        for (Object span : paddingSpans) {
            editable.removeSpan(span);
        }

        addSpans(editable);
    }

    private static final int GROUP_SIZE = 4;

    private void addSpans(Editable editable) {

        final int length = editable.length();
        for (int i = 1; i * (GROUP_SIZE) < length; i++) {
            int index = i * GROUP_SIZE;
            editable.setSpan(new DashSpan(), index - 1, index,
                    Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        }
    }
});

其中DashSpan类如下所示：

/**
 * A {@link ReplacementSpan} used for spacing in {@link android.widget.EditText}
 * to space things out. Adds '-'s
 */
public class DashSpan extends ReplacementSpan {

    @Override
    public int getSize(@NonNull Paint paint, CharSequence text, int start, int end, FontMetricsInt fm) {
        float padding = paint.measureText("-", 0, 1);
        float textSize = paint.measureText(text, start, end);
        return (int) (padding + textSize);
    }

    @Override
    public void draw(@NonNull Canvas canvas, CharSequence text, int start, int end, float x, int top, int y,
                     int bottom, @NonNull Paint paint) {
        canvas.drawText(text.subSequence(start, end) + "-", x, y, paint);
    }
}

这样，您将使用破折号直观地进行分组，但getText()将返回没有任何分组的文本。

要仅强制数字，您可以将属性android:digits="0123456789"和添加android:inputType="number"到EditText.

此解决方案基于此库的代码。