android 控制EditText字符长度［配置控制　代码控制］

　　　序：此文章主要概要如何控制EditText字符长度，分别从layout的配置和代码实现两方面说明．以备日后之用，也供大家学习．如有不恰当之处还请大家多多指出［红色　　　　　标记处为重点］．

　　　一：配置控制

android:id="@+id/registrationAuthCode_code_ex"
android:layout_width="fill_parent"
android:layout_height="@dimen/dip_height_3"
android:layout_centerVertical="true"
android:layout_marginLeft="@dimen/dip_spacing_4"
android:layout_toLeftOf="@id/ic_delete"
android:layout_toRightOf="@id/usr_icon_iv"
android:background="@color/transparent"
android:contentDescription="@string/regcode_codeet"
android:hint="@string/registrationauthcode_code_hint"
android:inputType="number"
android:maxLength="6"
android:textColor="@color/primary_black"
android:textColorHint="@color/second_gray"
android: textSize="@dimen/sp_size_3"/>

　　二：代码控制

import android.content.Context; import android.graphics.Color; import android.text.InputFilter; import android.text.SpannableStringBuilder; import android.text.Spanned; import android.widget.EditText; /** * * * @FileName * @author christineRuan * @date 2013-12-6 上午9:10:59 * @version V1.0 <实现：约束控件最大字符值> */ public class ESEditText extends EditText { //private String encoding = "GBK"; private int maxByteLength = 100; //默认100个字符 public ESEditText(Context context,int maxSize) { super(context); this.setTextColor(Color.BLACK); if(maxSize==-1) //未做maxSize配置 { maxSize=maxByteLength; } init(maxSize); } private void init(int maxSize) { maxByteLength=maxSize; setFilters(new InputFilter[] { inputFilter }); //设置输入过滤 } private InputFilter inputFilter = new InputFilter() { @Override public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) { try { int len = 0; boolean more = false; do { SpannableStringBuilder builder = new SpannableStringBuilder( dest).replace(dstart, dend,source.subSequence(start, end));//len = builder.toString().getBytes(encoding).length; dest).replace(dstart, dend, source.subSequence(start, end)); //len = builder.toString().getBytes(encoding).length; //字节长度 len = builder.toString().length(); //字符长度 more = len > maxByteLength; if (more) { end--; source = source.subSequence(start, end); } } while (more); return source; } catch (Exception e) { return "Exception"; } } }; }

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