自定义EditText

来源：互联网发布：青少年上网过滤软件编辑：程序博客网时间：2024/04/29 19:15

在工作中遇到了话题变颜色的需求，因为写的时候遇到了一些坑，所以总结一下。

主要出现的问题是在onTextChanged()方法中，直接使用<pre name="code" class="java">myEditText.getEditableText().setSpan()用于设置满足条件的话题的颜色。

注意：绝对不能再onTextChanged()方法中使用setText()方法，不然会导致中文无法输入（当然这仅限部分手机，比如我的手机）。

package com.mxr.dreammoments.view.widget;import android.content.Context;import android.graphics.Color;import android.text.Editable;import android.text.SpannableString;import android.text.Spanned;import android.text.TextWatcher;import android.text.style.ForegroundColorSpan;import android.util.AttributeSet;import android.widget.EditText;import com.mxr.dreambook.R;import com.mxr.dreambook.util.UiUtils;import java.util.ArrayList;import java.util.List;import java.util.regex.Matcher;import java.util.regex.Pattern;/** * Created by Administrator on 2016/9/27 0027. */public class MyEditText extends EditText {    private Context mContext;    private int mTopicColor = UiUtils.getResources().getColor(R.color.edit_input_username_color);//话题颜色    private int mUserNameColor = UiUtils.getResources().getColor(R.color.edit_input_username_color);//用户名称的颜色    private boolean mIsTopicBack = false;//是否从话题页返回    private int lastFlagIndex = -1;//记录最后一个有效##对中后一个#的位置    private MyTextChangeListener mMyTextChangeListener;//对文本的监听    private static final Pattern hashtagPattern =            Pattern.compile("#([^\\#|.]+)#");//满足话题的正则表达式    private MyEditText myEditText = this;//代表当前对象    public MyEditText(Context context) {        super(context);        mContext = context;    }    public MyEditText(Context context, AttributeSet attrs) {        super(context, attrs);        mContext = context;    }    public MyEditText(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        mContext = context;    }    private class MyChangedWatcher implements TextWatcher {        @Override        public void beforeTextChanged(CharSequence s, int start, int count, int after) {        }        @Override        public void onTextChanged(CharSequence s, int start, int before, int count) {            List<int[]> topicPositionList = new ArrayList<int[]>();            topicPositionList.addAll(getTopicPosition(s.toString()));            myEditText.getEditableText().setSpan(new ForegroundColorSpan(Color.BLACK), 0, s.toString().length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);//首先统一设置为黑色            for (int i = 0; i < topicPositionList.size(); i = i + 1) {//对满足话题部分的文字进行设置颜色                myEditText.getEditableText().setSpan(new ForegroundColorSpan(mTopicColor), topicPositionList.get(i)[0], topicPositionList.get(i)[1] + 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);            }            if (count > before) {//如果是增加文字                if (isJump(s.toString())) {                    mMyTextChangeListener.jump();                }            }        }        @Override        public void afterTextChanged(Editable s) {        }    }    /**     * 获取需要跳转的#     * @param string     * @return     */    private List<int[]> getTopicPosition(String string) {        char[] charArray = string.toCharArray();        int[] topicPositionArray;        List<Integer> topicList = new ArrayList<Integer>();        List<int[]> topicPositionList = new ArrayList<int[]>();        for(int i = 0; i < charArray.length; i++){            if(new Character(charArray[i]).equals('#')){                topicList.add(i);            }        }        //去除无效的#        for(int i = 0; i < topicList.size(); i++){            if ((i + 1) >= topicList.size()) {                break;            }            topicPositionArray = new int[2];            //一层过滤            if (topicList.get(i) + 1 != topicList.get(i + 1)){                topicPositionArray[0] = topicList.get(i);                topicPositionArray[1] = topicList.get(i + 1);                //二层过滤                Matcher matcher = hashtagPattern.matcher(string.substring(topicPositionArray[0], topicPositionArray[1] + 1));                if(matcher.matches()){                    //三层过滤                    if(topicPositionList.size() > 0){                        if(topicPositionList.get(topicPositionList.size() - 1)[1] != topicPositionArray[0]){                            topicPositionList.add(topicPositionArray);                        }                    }else{                        topicPositionList.add(topicPositionArray);                    }                }            }        }        if(topicPositionList.size() > 0){            lastFlagIndex = topicPositionList.get(topicPositionList.size() - 1)[1];        }else{            lastFlagIndex = -1;        }        return topicPositionList;    }    public void setMyTextChangeListener(MyTextChangeListener myTextChangeListener){        this.mMyTextChangeListener = myTextChangeListener;        addTextChangedListener(new MyChangedWatcher());    }    public interface MyTextChangeListener{        void jump();    }    /**     * 跳转逻辑     * @param string     * @return     */    private boolean isJump(String string) {        //通过查看不需要跳转的情况        //1.#为最后一对话题的#，2.通过话题页返回的#不需要跳转.3最后一个字符为非# 4....        //对于光标不在string最后位置的，不需要跳转话题页        if(getSelectionEnd() != string.length()){            return false;        }        //最后一个字符为#，最后一对有效的##的后一个#位置不是string串最后一个#，但是最后一个#位置是其加1        if(string.endsWith("#") && lastFlagIndex != string.lastIndexOf("#") && lastFlagIndex + 1 == string.lastIndexOf("#")){            mIsTopicBack = false;        }        //最后一个字符非#        if(!string.endsWith("#")){            mIsTopicBack = false;            return false;        }        //最后一个#，并且最后一对有效的##的后一个#位置就是string串最后一个#        if(string.endsWith("#") && lastFlagIndex == string.lastIndexOf("#")){           return false;        }        //表示从话题页返回的#号对，并且满足最后一个非#        if(mIsTopicBack && !string.endsWith("#")){            return false;        }        return true;    }    public int getmTopicColor() {        return mTopicColor;    }    public void setmTopicColor(int mTopicColor) {        this.mTopicColor = mTopicColor;    }    public boolean ismIsTopicBack() {        return mIsTopicBack;    }    public void setmIsTopicBack(boolean mIsTopicBack) {        this.mIsTopicBack = mIsTopicBack;    }    public void setHintText(String hintText){        myEditText.getEditableText().setSpan(new ForegroundColorSpan(mUserNameColor), 2, hintText.lastIndexOf(":"), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);    }    public void setTopicText(String hintText){        SpannableString spannableString = new SpannableString(hintText);        spannableString.setSpan(new ForegroundColorSpan(mTopicColor), 0, hintText.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);        setText(spannableString);    }    public void setContentText(String contentText){        List<int[]> topicPositionList = new ArrayList<int[]>();        topicPositionList.addAll(getTopicPosition(contentText.toString()));        setText(contentText);        for (int i = 0; i < topicPositionList.size(); i = i + 1) {            myEditText.getEditableText().setSpan(new ForegroundColorSpan(mTopicColor), topicPositionList.get(i)[0], topicPositionList.get(i)[1] + 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);        }    }}

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