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July 5, 2018 11:57
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EditText format number
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| package com.nestia.android.pay.utils; | |
| import android.support.annotation.NonNull; | |
| import android.text.Editable; | |
| import android.text.InputType; | |
| import android.text.Selection; | |
| import android.text.TextWatcher; | |
| import android.text.method.DigitsKeyListener; | |
| import android.widget.EditText; | |
| public class NumSpaceTextWatcher implements TextWatcher { | |
| private static final int DEFAULT_OFFSET = 4; | |
| // 目标输入框 | |
| private final EditText mDesTxt; | |
| // 偏移量(几位插入一空格) | |
| private int mOffset; | |
| // 记录目标字符串 | |
| private StringBuffer mBuffer = new StringBuffer(); | |
| // 改变之前的文本长度 | |
| private int mBeforeTextLength; | |
| // 改变之后的文本长度 | |
| private int mOnTextLength; | |
| // 改变之前去除空格的文本长度 | |
| private int mBeforeNumTxtLength; | |
| // 改变之后去除空格的文本长度 | |
| private int mNumTxtLength; | |
| // 目标 光标的位置 | |
| private int mLocation = 0; | |
| // 之前 光标的位置(可判断用户是否做删除操作) | |
| private int mBeforeLocation = 0; | |
| // 改变前有多少空格 | |
| private int mBeforeSpaceNumber = 0; | |
| // 是否选中空格覆盖 | |
| private boolean isOverrideSpace; | |
| // 被覆盖的空格数 | |
| private int mOverrideSpaceNum; | |
| // 是否是粘贴(此粘贴非彼粘贴) | |
| private boolean isPaste; | |
| // 复制的字符数(不包括空格) | |
| private int mPasteNum; | |
| // 是否需要进行格式化字符串操作 | |
| private boolean isChanged = false; | |
| public NumSpaceTextWatcher(@NonNull EditText target) { | |
| this(target, DEFAULT_OFFSET); | |
| } | |
| public NumSpaceTextWatcher(@NonNull EditText target, int offset) { | |
| if (target.getInputType() == InputType.TYPE_CLASS_NUMBER) { | |
| target.setInputType(InputType.TYPE_CLASS_TEXT); | |
| // 当InputType为Number时，手动设置我们的Listener | |
| target.setKeyListener(new MyDigitsKeyListener()); | |
| } else if (target.getInputType() != InputType.TYPE_CLASS_TEXT) { | |
| // 仅支持Text及Number类型的EditText | |
| throw new IllegalArgumentException("EditText only support TEXT and NUMBER InputTyp！"); | |
| } | |
| mDesTxt = target; | |
| mOffset = offset; | |
| } | |
| @Override | |
| public void beforeTextChanged(CharSequence s, int start, int count, int after) { | |
| mBeforeTextLength = s.length(); | |
| mBeforeNumTxtLength = s.toString().replaceAll(" ", "").length(); | |
| mBeforeLocation = mDesTxt.getSelectionEnd(); | |
| // 重置mBuffer | |
| if (mBuffer.length() > 0) { | |
| mBuffer.delete(0, mBuffer.length()); | |
| } | |
| // 计算改变前空格的个数 | |
| mBeforeSpaceNumber = 0; | |
| for (int i = 0; i < s.length(); i++) { | |
| if (s.charAt(i) == ' ') { | |
| mBeforeSpaceNumber++; | |
| } | |
| } | |
| } | |
| @Override | |
| public void onTextChanged(CharSequence s, int start, int before, int count) { | |
| mOnTextLength = s.length(); | |
| mNumTxtLength = s.toString().replaceAll(" ", "").length(); | |
| // 判断是否是粘贴,其中粘贴小于offset位的不做判断,并且offset>2判断才有意义 | |
| if (mOffset >= 2 && count >= mOffset) { | |
| isPaste = true; | |
| mPasteNum = count; | |
| } else { | |
| isPaste = false; | |
| mPasteNum = 0; | |
| } | |
| // 若是经过afterTextChanged方法，则直接return | |
| if (isChanged) { | |
| isChanged = false; | |
| return; | |
| } | |
| // 若改变后长度小于等于mOffset - 1，则直接return | |
| if (mOnTextLength <= mOffset - 1) { | |
| isChanged = false; | |
| return; | |
| } | |
| // 若改变前后长度一致，并且数字位数相同，则isChanged为false | |
| // (数字位数相同是防止用户单选空格后输入数字) | |
| if (mBeforeTextLength == mOnTextLength && mBeforeNumTxtLength == mNumTxtLength) { | |
| isChanged = false; | |
| return; | |
| } else { | |
| isChanged = true; | |
| } | |
| // 若要进行格式化，则判断该情况 | |
| // 判断是否选中空格覆盖(排除删除空格的情况) | |
| if (before == 1 && count == 0) { | |
| isOverrideSpace = false; | |
| } else { | |
| isOverrideSpace = mBeforeTextLength - mBeforeSpaceNumber - before + count != mNumTxtLength; | |
| } | |
| // 若是该情况，计算覆盖空格的个数 | |
| if (isOverrideSpace) { | |
| mOverrideSpaceNum = mNumTxtLength - (mBeforeTextLength - mBeforeSpaceNumber - before + count); | |
| } else { | |
| mOverrideSpaceNum = 0; | |
| } | |
| } | |
| @Override | |
| public void afterTextChanged(Editable s) { | |
| if (isChanged) { | |
| mLocation = mDesTxt.getSelectionEnd(); | |
| // 去除空格 | |
| mBuffer.append(s.toString().replace(" ", "")); | |
| // 格式化字符串，mOffset位加一个空格 | |
| int index = 0; | |
| int mAfterSpaceNumber = 0; | |
| while (index < mBuffer.length()) { | |
| if (index == mOffset * (1 + mAfterSpaceNumber) + mAfterSpaceNumber) { | |
| mBuffer.insert(index, ' '); | |
| mAfterSpaceNumber++; | |
| } | |
| index++; | |
| } | |
| // 判断是否是粘贴键入 | |
| if (isPaste) { | |
| mLocation += mPasteNum / mOffset; | |
| isPaste = false; | |
| // 判断是否是选中空格输入 | |
| } else if (isOverrideSpace) { | |
| mLocation += mOverrideSpaceNum; | |
| // 判断此时光标是否在特殊位置上 | |
| } else if (mLocation % (mOffset + 1) == 0) { | |
| // 是键入OR删除 | |
| if (mBeforeLocation <= mLocation) { | |
| mLocation++; | |
| } else { | |
| mLocation--; | |
| } | |
| } | |
| // 若是删除数据刚好删除一位，前一位是空格，mLocation会超出格式化后字符串的长度(因为格 | |
| // 式化后的长度没有不包括最后的空格)，将光标移到正确的位置 | |
| String str = mBuffer.toString(); | |
| if (mLocation > str.length()) { | |
| mLocation = str.length(); | |
| } else if (mLocation < 0) { | |
| mLocation = 0; | |
| } | |
| s.replace(0, s.length(), str); | |
| Editable editable = mDesTxt.getText(); | |
| Selection.setSelection(editable, mLocation); | |
| } | |
| } | |
| // 继承DigitsKeyListener，实现我们自己的Listener | |
| private class MyDigitsKeyListener extends DigitsKeyListener { | |
| private char[] mAccepted = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', ' ' }; | |
| @Override | |
| protected char[] getAcceptedChars() { | |
| return mAccepted; | |
| } | |
| } | |
| } |
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