65 lines
1.7 KiB
Java
65 lines
1.7 KiB
Java
package com.android.util;
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import android.text.Editable;
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import android.text.Selection;
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import android.text.TextWatcher;
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import android.widget.EditText;
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/*
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* 监听输入内容是否超出最大长度，并设置光标位置
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* */
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public class MaxLengthWatcher implements TextWatcher {
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private int maxLen = 0;
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private EditText editText = null;
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public MaxLengthWatcher(int maxLen, EditText editText) {
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this.maxLen = maxLen;
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this.editText = editText;
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}
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public MaxLengthWatcher() {
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}
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public void afterTextChanged(Editable arg0) {
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// TODO Auto-generated method stub
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}
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public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
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int arg3) {
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// TODO Auto-generated method stub
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}
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public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
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// TODO Auto-generated method stub
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Editable editable = editText.getText();
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int len = editable.length();
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if(len > maxLen)
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{
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int selEndIndex = Selection.getSelectionEnd(editable);
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String str = editable.toString();
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//截取新字符串
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String newStr = str.substring(0,maxLen);
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editText.setText(newStr);
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editable = editText.getText();
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//新字符串的长度
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int newLen = editable.length();
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//旧光标位置超过字符串长度
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if(selEndIndex > newLen)
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{
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selEndIndex = editable.length();
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}
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//设置新光标所在的位置
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Selection.setSelection(editable, selEndIndex);
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}
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}
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}
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