自動添加分隔符的EditText

對與一些如：身份證、銀行卡等号碼型文本需要在EditText中輸入時，會有一些自動分割的需求。如四位加個空格或者”-“等。

下面的是一個簡單的自定義EditText的View，來監聽EditText的輸入變化，并根據設定的索引位置添加分隔符。

身份證格式的效果圖如下：

下面是繼承EditText的實作：

package com.example.admin.view;

import android.content.Context;
import android.content.res.TypedArray;
import android.text.Editable;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.widget.EditText;

import com.example.admin.myapplication.R;

import java.util.ArrayList;
import java.util.List;

public class SpaceEditText extends EditText {

    private String spaceChar = " ";
private String spaceIndex = "";
private List<Integer> indexList = new ArrayList<>();

public SpaceEditText(Context context) {
    super(context);
}

public SpaceEditText(Context context, AttributeSet attrs) {
    super(context, attrs);
    TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.SpaceEditText);
    spaceChar = typedArray.getString(typedArray.getIndex(R.styleable.SpaceEditText_spaceChar));
    spaceIndex = typedArray.getString(typedArray.getIndex(R.styleable.SpaceEditText_spaceIndex));

    if (!TextUtils.isEmpty(spaceIndex)) {
        String[] indexs = spaceIndex.split(",");
        for (String str : indexs) {
            indexList.add(Integer.parseInt(str));
        }
    }

    System.out.println("spaceChar:" + spaceChar);
    System.out.println("indexList:" + indexList);

    editTextLintener();

}

public SpaceEditText(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
}

public void editTextLintener() {
    this.addTextChangedListener(new TextWatcher() {
        private boolean isChange = false;
        private int lastLength = 0;

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            lastLength = s.length();
        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            int length = s.length();

            if (!isChange) {
                int selectIndex = getSelectionEnd();
                if (lastLength < length) {
                    isChange = true;
                    String str = addSpace(s.toString());
                    int changeIndex = selectIndex;
                    if (selectIndex > 0 && selectIndex < str.length() && str.charAt(selectIndex - 1) == spaceChar.charAt(0)) {
                        changeIndex = selectIndex + 1;
                    }
                    setText(str);
                    if (selectIndex < length) {
                        setSelection(changeIndex);
                    } else
                        setSelection(str.length());
                } else {
                    isChange = true;
                    String currentStr = s.toString();
                    int changeIndex = selectIndex;
                    if (selectIndex > 0 && currentStr.charAt(selectIndex - 1) == spaceChar.charAt(0)) {
                        changeIndex = selectIndex - 1;
                        currentStr = currentStr.substring(0, selectIndex - 1) + currentStr.substring(selectIndex, currentStr.length());
                    }
                    String str = addSpace(currentStr);
                    setText(str);
                    if (selectIndex < length)
                        setSelection(changeIndex);
                    else
                        setSelection(str.length());
                }
            } else {
                isChange = false;
            }
        }

        private String addSpace(String currentText) {
            currentText = currentText.toString().replace(spaceChar, "");
            char[] charArray = currentText.toCharArray();
            StringBuffer sb = new StringBuffer("");
            for (int i = 0; i < charArray.length; i++) {
                if (indexList.contains(i)) {
                    sb.append(spaceChar);
                }
                sb.append(charArray[i]);
            }
            return sb.toString();
        }


        @Override
        public void afterTextChanged(Editable s) {
            if (!isChange) {
                // 對回調方法進行調用，使監聽回調的地方得到目前文本框中格式化以後的字元串結果
                if (listener != null) {
                    listener.afterTextChanged(s.toString().replace(spaceChar, ""));
                }
            }
        }
    });

}
private AfterTextChangedListener listener = null;

public void setAfterTextChangedListener(AfterTextChangedListener listener) {
    this.listener = listener;
}

/**
 * 定義一個回調監聽接口，在完成輸入時傳回格式化好的輸入文本
 */
public interface AfterTextChangedListener {
    public void afterTextChanged(String text);
}

}
           

attrs.xml中聲明SpaceEditText的屬性

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="SpaceEditText">
        <attr name="spaceChar" format="string" />
        <attr name="spaceIndex" format="string" />
    </declare-styleable>    
</resources>
           

布局檔案中使用

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context="com.example.admin.myapplication.EditTextActivity">

<com.example.admin.view.SpaceEditText
    android:id="@+id/editText"
    android:layout_width="match_parent"
    android:inputType="number"
    android:layout_height="wrap_content"
    app:spaceChar="-"
    android:maxLength="22"
    app:spaceIndex="4,8,13,18" />

<Button
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="送出"
    android:padding="5dp"
    android:id="@+id/submitBtn"
    android:enabled="false"/>

</LinearLayout>
           

Activity中使用

package com.example.admin.myapplication;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.example.admin.view.SpaceEditText;

public class EditTextActivity extends ActionBarActivity {

private SpaceEditText editText;
private Button submitBtn;
private String textInfo;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_edit_text);

    editText = (SpaceEditText) findViewById(R.id.editText);
    submitBtn = (Button) findViewById(R.id.submitBtn);

    editText.setAfterTextChangedListener(new SpaceEditText.AfterTextChangedListener() {
        @Override
        public void afterTextChanged(String text) {

            if (text.length() == 18) {
                submitBtn.setEnabled(true);
                textInfo = text;
            }
        }
    });

    submitBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(getApplicationContext(),"text:"+textInfo,Toast.LENGTH_SHORT).show();
        }
    });
}
}