原文網址：http://blog.csdn.net/fulinwsuafcie/article/details/7437768

方法一：

在 xml 文件中設置文本編輯框屬性作字符數限制

如：android:maxLength="10" 即限制最大輸入字符個數為10

?

方法二：

在代碼中使用InputFilter 進行過濾

//editText.setFilters(new InputFilter[]{new InputFilter.LengthFilter(20)}); 即限定最大輸入字符數為20

?

?

[java]?view plaincopy

public?class?TextEditActivity?extends?Activity?{??

????/**?Called?when?the?activity?is?first?created.?*/??

????@Override??

????public?void?onCreate(Bundle?savedInstanceState)?{??

????????super.onCreate(savedInstanceState);??

????????setContentView(R.layout.main);??

??????????

????????EditText?editText?=?(EditText)findViewById(R.id.entry);??

????????editText.setFilters(new?InputFilter[]{new?InputFilter.LengthFilter(20)});??

????}??

}??

方法三：

利用 TextWatcher 進行監聽

?

[java]?view plaincopy

package?cie.textEdit;??

??

import?android.text.Editable;??

import?android.text.Selection;??

import?android.text.TextWatcher;??

import?android.widget.EditText;??

??

/*?

?*?監聽輸入內容是否超出最大長度，并設置光標位置?

?*?*/??

public?class?MaxLengthWatcher?implements?TextWatcher?{??

??

????private?int?maxLen?=?0;??

????private?EditText?editText?=?null;??

??????

??????

????public?MaxLengthWatcher(int?maxLen,?EditText?editText)?{??

????????this.maxLen?=?maxLen;??

????????this.editText?=?editText;??

????}??

??

????public?void?afterTextChanged(Editable?arg0)?{??

????????//?TODO?Auto-generated?method?stub??

??????????

????}??

??

????public?void?beforeTextChanged(CharSequence?arg0,?int?arg1,?int?arg2,??

????????????int?arg3)?{??

????????//?TODO?Auto-generated?method?stub??

??????????

????}??

??

????public?void?onTextChanged(CharSequence?arg0,?int?arg1,?int?arg2,?int?arg3)?{??

????????//?TODO?Auto-generated?method?stub??

????????Editable?editable?=?editText.getText();??

????????int?len?=?editable.length();??

??????????

????????if(len?>?maxLen)??

????????{??

????????????int?selEndIndex?=?Selection.getSelectionEnd(editable);??

????????????String?str?=?editable.toString();??

????????????//截取新字符串??

????????????String?newStr?=?str.substring(0,maxLen);??

????????????editText.setText(newStr);??

????????????editable?=?editText.getText();??

??????????????

????????????//新字符串的長度??

????????????int?newLen?=?editable.length();??

????????????//舊光標位置超過字符串長度??

????????????if(selEndIndex?>?newLen)??

????????????{??

????????????????selEndIndex?=?editable.length();??

????????????}??

????????????//設置新光標所在的位置??

????????????Selection.setSelection(editable,?selEndIndex);??

??????????????

????????}??

????}??

??

}??

對應的 activity 部分的調用為：

?

?

[java]?view plaincopy

package?cie.textEdit;??

??

import?android.app.Activity;??

import?android.os.Bundle;??

import?android.text.InputFilter;??

import?android.widget.EditText;??

??

public?class?TextEditActivity?extends?Activity?{??

????/**?Called?when?the?activity?is?first?created.?*/??

????@Override??

????public?void?onCreate(Bundle?savedInstanceState)?{??

????????super.onCreate(savedInstanceState);??

????????setContentView(R.layout.main);??

??

????????EditText?editText?=?(EditText)?findViewById(R.id.entry);??

????????editText.addTextChangedListener(new?MaxLengthWatcher(10,?editText));??

??

????}??

}??

限制輸入字符數為10個

?

main.xml 文件

?

[html]?view plaincopy

<?xml?version="1.0"?encoding="utf-8"?>??

<RelativeLayout?xmlns:android="http://schemas.android.com/apk/res/android"??

????android:layout_width="fill_parent"??

????android:layout_height="fill_parent">??

????<TextView??

????????android:id="@+id/label"??

????????android:layout_width="fill_parent"??

????????android:layout_height="wrap_content"??

????????android:text="Type?here:"/>??

????<EditText??

????????android:id="@+id/entry"??

????????android:singleLine="true"??

????????android:layout_width="fill_parent"??

????????android:layout_height="wrap_content"??

????????android:background="@android:drawable/editbox_background"??

????????android:layout_below="@id/label"/>??

????<Button??

????????android:id="@+id/ok"??

????????android:layout_width="wrap_content"??

????????android:layout_height="wrap_content"??

????????android:layout_below="@id/entry"??

????????android:layout_alignParentRight="true"??

????????android:layout_marginLeft="10dip"??

????????android:text="OK"?/>??

????<Button??

????????android:layout_width="wrap_content"??

????????android:layout_height="wrap_content"??

????????android:layout_toLeftOf="@id/ok"??

????????android:layout_alignTop="@id/ok"??

????????android:text="Cancel"?/>??

</RelativeLayout>??

效果為輸入了10個字符后，光標停在末尾

?

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