記得android中有個android.text包,這裏提供了對文本的強大的處理功能。
添加圖片主要用SpannableString和ImageSpan類:
- Drawable drawable = getResources().getDrawable(id);
- drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
- //需要處理的文本,[smile]是需要被替代的文本
- SpannableString spannable = new SpannableString(getText().toString()+"[smile]");
- //要讓圖片替代指定的文字就要用ImageSpan
- ImageSpan span = new ImageSpan(drawable, ImageSpan.ALIGN_BASELINE);
- //開始替換,注意第2和第3個參數表示從哪裏開始替換到哪裏替換結束(start和end)
- //最後一個參數類似數學中的集合,[5,12)表示從5到12,包括5但不包括12
- spannable.setSpan(span, getText().length(),getText().length()+"[smile]".length(), Spannable.SPAN_INCLUSIVE_EXCLUSIVE);
- setText(spannable);
Drawable drawable = getResources().getDrawable(id);
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
//需要處理的文本,[smile]是需要被替代的文本
SpannableString spannable = new SpannableString(getText().toString()+"[smile]");
//要讓圖片替代指定的文字就要用ImageSpan
ImageSpan span = new ImageSpan(drawable, ImageSpan.ALIGN_BASELINE);
//開始替換,注意第2和第3個參數表示從哪裏開始替換到哪裏替換結束(start和end)
//最後一個參數類似數學中的集合,[5,12)表示從5到12,包括5但不包括12
spannable.setSpan(span, getText().length(),getText().length()+"[smile]".length(), Spannable.SPAN_INCLUSIVE_EXCLUSIVE);
setText(spannable);
將需要的文字高亮顯示:
- public void highlight(int start,int end){
- SpannableStringBuilder spannable=new SpannableStringBuilder(getText().toString());//用於可變字符串
- ForegroundColorSpan span=new ForegroundColorSpan(Color.RED);
- spannable.setSpan(span, start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
- setText(spannable);
- }
public void highlight(int start,int end){
SpannableStringBuilder spannable=new SpannableStringBuilder(getText().toString());//用於可變字符串
ForegroundColorSpan span=new ForegroundColorSpan(Color.RED);
spannable.setSpan(span, start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
setText(spannable);
}
加下劃線:
- public void underline(int start,int end){
- SpannableStringBuilder spannable=new SpannableStringBuilder(getText().toString());
- CharacterStyle span=new UnderlineSpan();
- spannable.setSpan(span, start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
- setText(spannable);
- }
public void underline(int start,int end){
SpannableStringBuilder spannable=new SpannableStringBuilder(getText().toString());
CharacterStyle span=new UnderlineSpan();
spannable.setSpan(span, start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
setText(spannable);
}
組合運用:
- SpannableStringBuilder spannable=new SpannableStringBuilder(getText().toString());
- CharacterStyle span_1=new StyleSpan(android.graphics.Typeface.ITALIC);
- CharacterStyle span_2=new ForegroundColorSpan(Color.RED);
- spannable.setSpan(span_1, start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
- spannable.setSpan(span_2, start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
- setText(spannable);
SpannableStringBuilder spannable=new SpannableStringBuilder(getText().toString());
CharacterStyle span_1=new StyleSpan(android.graphics.Typeface.ITALIC);
CharacterStyle span_2=new ForegroundColorSpan(Color.RED);
spannable.setSpan(span_1, start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spannable.setSpan(span_2, start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
setText(spannable);
- /**
- * 帶有\n換行符的字符串都可以用此方法顯示2種顏色
- * @param text
- * @param color1
- * @param color2
- * @return
- */
- public SpannableStringBuilder highlight(String text,int color1,int color2,int fontSize){
- SpannableStringBuilder spannable=new SpannableStringBuilder(text);//用於可變字符串
- CharacterStyle span_0=null,span_1=null,span_2;
- int end=text.indexOf("\n");
- if(end==-1){//如果沒有換行符就使用第一種顏色顯示
- span_0=new ForegroundColorSpan(color1);
- spannable.setSpan(span_0, 0, text.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
- }else{
- span_0=new ForegroundColorSpan(color1);
- span_1=new ForegroundColorSpan(color2);
- spannable.setSpan(span_0, 0, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
- spannable.setSpan(span_1, end+1, text.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
- span_2=new AbsoluteSizeSpan(fontSize);//字體大小
- spannable.setSpan(span_2, end+1, text.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
- }
- return spannable;
- }
/**
* 帶有\n換行符的字符串都可以用此方法顯示2種顏色
* @param text
* @param color1
* @param color2
* @return
*/
public SpannableStringBuilder highlight(String text,int color1,int color2,int fontSize){
SpannableStringBuilder spannable=new SpannableStringBuilder(text);//用於可變字符串
CharacterStyle span_0=null,span_1=null,span_2;
int end=text.indexOf("\n");
if(end==-1){//如果沒有換行符就使用第一種顏色顯示
span_0=new ForegroundColorSpan(color1);
spannable.setSpan(span_0, 0, text.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}else{
span_0=new ForegroundColorSpan(color1);
span_1=new ForegroundColorSpan(color2);
spannable.setSpan(span_0, 0, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spannable.setSpan(span_1, end+1, text.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
span_2=new AbsoluteSizeSpan(fontSize);//字體大小
spannable.setSpan(span_2, end+1, text.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
return spannable;
}
以上實際都是Html.fromHtml(html)的代碼實現形式。
另外有個問題:如何讓一個TextView中的關鍵字高亮顯示?
http://www.eoeandroid.com/forum.php?mod=viewthread&tid=57880&page=1&extra=#pid558440
解決如下:
- /**
- * 關鍵字高亮顯示
- * @param target 需要高亮的關鍵字
- */
- public void highlight(String target){
- String temp=getText().toString();
- SpannableStringBuilder spannable = new SpannableStringBuilder(temp);
- CharacterStyle span=null;
- Pattern p = Pattern.compile(target);
- Matcher m = p.matcher(temp);
- while (m.find()) {
- span = new ForegroundColorSpan(Color.RED);//需要重複!
- spannable.setSpan(span, m.start(), m.end(),Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
- }
- setText(spannable);
- }
/**
* 關鍵字高亮顯示
* @param target 需要高亮的關鍵字
*/
public void highlight(String target){
String temp=getText().toString();
SpannableStringBuilder spannable = new SpannableStringBuilder(temp);
CharacterStyle span=null;
Pattern p = Pattern.compile(target);
Matcher m = p.matcher(temp);
while (m.find()) {
span = new ForegroundColorSpan(Color.RED);//需要重複!
spannable.setSpan(span, m.start(), m.end(),Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
setText(spannable);
}
循環太慢,不知道有沒有簡單高效的方法?
下面給出一個類,專門用於將指定的文字轉換成表情顯示,當然使用前表情圖片需要先導入drawable,另外表情圖片的數量需要和數組定義的長度一致!否則拋參數異常。
- import android.content.Context;
- import android.text.Spannable;
- import android.text.SpannableStringBuilder;
- import android.text.style.ImageSpan;
- import android.util.Log;
- import java.util.HashMap;
- import java.util.regex.Matcher;
- import java.util.regex.Pattern;
- public class SmileyParser {
- private Context mContext;
- private String[] mSmileyTexts;
- private Pattern mPattern;
- private HashMap<String, Integer> mSmileyToRes;
- public static final int[] DEFAULT_SMILEY_RES_IDS = {
- R.drawable.aini,
- R.drawable.aoteman,
- R.drawable.baibai,
- R.drawable.baobao,
- R.drawable.beiju,
- R.drawable.beishang,
- R.drawable.bianbian,
- R.drawable.bishi,
- R.drawable.bizui,
- R.drawable.buyao,
- R.drawable.chanzui,
- };
- public SmileyParser(Context context) {
- mContext = context;
- mSmileyTexts = mContext.getResources().getStringArray(DEFAULT_SMILEY_TEXTS);
- mSmileyToRes = buildSmileyToRes();
- mPattern = buildPattern();
- }
- public static final int DEFAULT_SMILEY_TEXTS = R.array.default_smiley_texts;
- private HashMap<String, Integer> buildSmileyToRes() {
- if (DEFAULT_SMILEY_RES_IDS.length != mSmileyTexts.length) {
- // Log.w("SmileyParser", "Smiley resource ID/text mismatch");
- //表情的數量需要和數組定義的長度一致!
- throw new IllegalStateException("Smiley resource ID/text mismatch");
- }
- HashMap<String, Integer> smileyToRes = new HashMap<String, Integer>(mSmileyTexts.length);
- for (int i = 0; i < mSmileyTexts.length; i++) {
- smileyToRes.put(mSmileyTexts[i], DEFAULT_SMILEY_RES_IDS[i]);
- }
- return smileyToRes;
- }
- //構建正則表達式
- private Pattern buildPattern() {
- StringBuilder patternString = new StringBuilder(mSmileyTexts.length * 3);
- patternString.append('(');
- for (String s : mSmileyTexts) {
- patternString.append(Pattern.quote(s));
- patternString.append('|');
- }
- patternString.replace(patternString.length() - 1, patternString.length(), ")");
- return Pattern.compile(patternString.toString());
- }
- //根據文本替換成圖片
- public CharSequence replace(CharSequence text) {
- SpannableStringBuilder builder = new SpannableStringBuilder(text);
- Matcher matcher = mPattern.matcher(text);
- while (matcher.find()) {
- int resId = mSmileyToRes.get(matcher.group());
- builder.setSpan(new ImageSpan(mContext, resId),matcher.start(), matcher.end(),Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
- }
- return builder;
- }
- }
import android.content.Context;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.style.ImageSpan;
import android.util.Log;
import java.util.HashMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class SmileyParser {
private Context mContext;
private String[] mSmileyTexts;
private Pattern mPattern;
private HashMap<String, Integer> mSmileyToRes;
public static final int[] DEFAULT_SMILEY_RES_IDS = {
R.drawable.aini,
R.drawable.aoteman,
R.drawable.baibai,
R.drawable.baobao,
R.drawable.beiju,
R.drawable.beishang,
R.drawable.bianbian,
R.drawable.bishi,
R.drawable.bizui,
R.drawable.buyao,
R.drawable.chanzui,
};
public SmileyParser(Context context) {
mContext = context;
mSmileyTexts = mContext.getResources().getStringArray(DEFAULT_SMILEY_TEXTS);
mSmileyToRes = buildSmileyToRes();
mPattern = buildPattern();
}
public static final int DEFAULT_SMILEY_TEXTS = R.array.default_smiley_texts;
private HashMap<String, Integer> buildSmileyToRes() {
if (DEFAULT_SMILEY_RES_IDS.length != mSmileyTexts.length) {
// Log.w("SmileyParser", "Smiley resource ID/text mismatch");
//表情的數量需要和數組定義的長度一致!
throw new IllegalStateException("Smiley resource ID/text mismatch");
}
HashMap<String, Integer> smileyToRes = new HashMap<String, Integer>(mSmileyTexts.length);
for (int i = 0; i < mSmileyTexts.length; i++) {
smileyToRes.put(mSmileyTexts[i], DEFAULT_SMILEY_RES_IDS[i]);
}
return smileyToRes;
}
//構建正則表達式
private Pattern buildPattern() {
StringBuilder patternString = new StringBuilder(mSmileyTexts.length * 3);
patternString.append('(');
for (String s : mSmileyTexts) {
patternString.append(Pattern.quote(s));
patternString.append('|');
}
patternString.replace(patternString.length() - 1, patternString.length(), ")");
return Pattern.compile(patternString.toString());
}
//根據文本替換成圖片
public CharSequence replace(CharSequence text) {
SpannableStringBuilder builder = new SpannableStringBuilder(text);
Matcher matcher = mPattern.matcher(text);
while (matcher.find()) {
int resId = mSmileyToRes.get(matcher.group());
builder.setSpan(new ImageSpan(mContext, resId),matcher.start(), matcher.end(),Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
return builder;
}
}
在res/arrays.xml中添加數組:
- <?xml version="1.0" encoding="UTF-8"?>
- <resources xmlns:android="http://schemas.android.com/apk/res/android"
- xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
- <string-array name="default_smiley_texts">
- <item >[愛你]</item>
- <item >[機器人]</item>
- <item >[拜拜]</item>
- <item >[抱抱]</item>
- <item >[悲劇]</item>
- <item >[悲傷]</item>
- <item >[便便]</item>
- <item >[鄙視]</item>
- <item >[閉嘴]</item>
- <item >[不要]</item>
- <item >[饞嘴]</item>
- </string-array>
- </resources>
使用:
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- TextView tvShow = (TextView) findViewById(R.id.tvShow);
- TextView tvSource = (TextView) findViewById(R.id.tvSource);
- SmileyParser parser = new SmileyParser(this);
- String text = "[鄙視][愛你][便便][饞嘴][機器人]";
- tvSource.setText("原文:"+text);
- tvShow.setText(parser.replace("SmileyParser類處理後:"+text));
- }
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TextView tvShow = (TextView) findViewById(R.id.tvShow);
TextView tvSource = (TextView) findViewById(R.id.tvSource);
SmileyParser parser = new SmileyParser(this);
String text = "[鄙視][愛你][便便][饞嘴][機器人]";
tvSource.setText("原文:"+text);
tvShow.setText(parser.replace("SmileyParser類處理後:"+text));
}
效果: