Android如何着色字符串的特定部分

文章选自StackOverflow（简称：SOF）精选问答汇总系列文章之一，本系列文章将为读者分享国外最优质的精彩问与答，供读者学习和了解国外最新技术。本文探讨Android如何着色字符串的特定部分。

问题：

SiKni8

如下CustomAdapter:

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package com.test.testing;   import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Calendar; import java.util.Locale;   import android.app.Activity; import android.content.Context; import android.graphics.Color; import android.graphics.Typeface; import android.text.Spannable; import android.text.SpannableString; import android.text.style.ForegroundColorSpan; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.ImageView; import android.widget.TextView;   public class SetRowsCustomAdapter extends ArrayAdapter<SetRows> {     Context context;    int layoutResourceId;    ArrayList<SetRows> data=new ArrayList<SetRows>();    DateFormat df = new SimpleDateFormat("EEEEE, LLLL d", Locale.US);    String[] suspendedDates = {             "Monday, January 20",             "Friday, January 31",     };    public SetRowsCustomAdapter(Context context, int layoutResourceId, ArrayList<SetRows> data) {        super(context, layoutResourceId, data);        this.layoutResourceId = layoutResourceId;        this.context = context;        this.data = data;    }      @Override    public View getView(int position, View convertView, ViewGroup parent) {        View row = convertView;        ImageHolder holder = null;          if(row == null)        {            LayoutInflater inflater = ((Activity)context).getLayoutInflater();            row = inflater.inflate(layoutResourceId, parent, false);              holder = new ImageHolder();            holder.txtTitle = (TextView)row.findViewById(R.id.tvDateVal);            //holder.txtTitle.setTypeface(Typeface.createFromAsset(getContext().getAssets(), "fonts/robm.ttf"));            holder.imgIcon = (ImageView)row.findViewById(R.id.ivIcon0);            holder.txtDate = (TextView)row.findViewById(R.id.tvDateNum);            holder.txtID = (TextView)row.findViewById(R.id.tvReasonVal);            //holder.txtID.setTypeface(Typeface.createFromAsset(getContext().getAssets(), "fonts/robm.ttf"));            row.setTag(holder);        }        else        {            holder = (ImageHolder)row.getTag();        }          SetRows myImage = data.get(position);        int inReason = myImage.name.indexOf(","); //myImage.name is the same string as suspendedDates[];         String strR = myImage.name.substring(0, inReason);         Spannable WordToSpan = new SpannableString(strR);         WordToSpan.setSpan(new ForegroundColorSpan(Color.parseColor("#4787ED")), 0, WordToSpan.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);         String strRNext = myImage.name.substring(inReason, myImage.name.length());         Spannable WordToSpan1 = new SpannableString(strRNext);     WordToSpan1.setSpan(new ForegroundColorSpan(R.color.dateholiday), 0, WordToSpan1.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);         String strConcat = WordToSpan.toString() + WordToSpan1.toString();          holder.txtTitle.setText(strConcat);//myImage.name);        holder.txtID.setText(myImage.id);        holder.txtDate.setText(myImage.date);        int outImage=myImage.image;        /*if (myImage.name.contains(df.format(Calendar.getInstance(Locale.US).getTime()))) {            holder.imgIcon.setImageResource(R.drawable.caliconpressed);        }        else {            holder.imgIcon.setImageResource(R.drawable.calicon);        }*/       return row;      }      static class ImageHolder    {        ImageView imgIcon;        TextView txtTitle;        TextView txtID;        TextView txtDate;    } }

我用Spannable来给字符串分别着色，想要达到这种效果

但是显示出来的还是这个样子：

有没有谁知道如何利用Adapter来实现我想要的效果。

答案：

Booger

不要把Spannable变换成字符串 (也就是说，不要做:WordToSpan.toString())

而是，直接将Spannable设置到holder，就像这样：

1	holder.txtTitle.setText(WordToSpan + WordToSpan1);

Martin Cazares

像下面这样用spannable 字符串

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SpannableString ss = new SpannableString("hey #abc how are you."); ss.setSpan(new ForegroundColorSpan(Color.RED), 4, 9, 0); //Now just add the SpannableString to your textview textView.setText(ss);

希望这能帮到你。

原文链接：How to color specific part of a String

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