我的Android进阶之旅------>Android关于ImageSpan和SpannableString的初步了解

最近要实现一个类似QQ聊天输入框，在输入框中可以同时输入文字和表情图像的功能。如下图所示的效果：



为了实现这个效果，先去了解了一下ImageSpan和SpannableString的用法。下面用一个小实例来看看具体的用法，效果如下：



代码如下：

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView mDetailView = (TextView) findViewById(R.id.detail);
String text = "大家好啊，多笑笑嘛，就像这样[smile]";
ImageSpan imageSpan=new ImageSpan(this, R.drawable.smile);
SpannableString spannableString = new SpannableString(
text);
spannableString.setSpan(imageSpan, text.indexOf('['),
text.indexOf(']') + 1,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
mDetailView.setText(spannableString);
}

代码中主要是将 [smile]文本 替换成了 R.id.smile图像

布局文件：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

<TextView
android:id="@+id/detail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />

</RelativeLayout>

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至于要实现第一图所示的QQ聊天输入框的效果，需要找到多张QQ表情图片，然后和相对应的文本，用一个Map<String key,Integer value>来存储起来。然后使用网格布局，将所有的表情都进行相关的缩放效果后再显示出来，还得使用分页技术，以及添加立体翻转效果特效等，这里就不贴代码了。
可以参考网上的相关博客：
Android
UI【android 仿微信、QQ聊天，带表情，可翻页，带翻页拖动缓冲】
地址：http://blog.csdn.net/lnb333666/article/details/8546497
 
 
下面是一个简单的工具栏

import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import android.content.Context;
import android.text.Spannable;
import android.text.Spannable.Factory;
import android.text.style.ImageSpan;

import com.fanxin.app.R;

public class SmileUtils {
public static final String ee_1 = "[):]";
public static final String ee_2 = "[:D]";
public static final String ee_3 = "[;)]";
public static final String ee_4 = "[:-o]";
public static final String ee_5 = "[:p]";
public static final String ee_6 = "[(H)]";
public static final String ee_7 = "[:@]";
public static final String ee_8 = "[:s]";
public static final String ee_9 = "[:$]";
public static final String ee_10 = "[:(]";
public static final String ee_11 = "[:'(]";
public static final String ee_12 = "[:|]";
public static final String ee_13 = "[(a)]";
public static final String ee_14 = "[8o|]";
public static final String ee_15 = "[8-|]";
public static final String ee_16 = "[+o(]";
public static final String ee_17 = "[<o)]";
public static final String ee_18 = "[|-)]";
public static final String ee_19 = "[*-)]";
public static final String ee_20 = "[:-#]";
public static final String ee_21 = "[:-*]";
public static final String ee_22 = "[^o)]";
public static final String ee_23 = "[8-)]";
public static final String ee_24 = "[(|)]";
public static final String ee_25 = "[(u)]";
public static final String ee_26 = "[(S)]";
public static final String ee_27 = "[(*)]";
public static final String ee_28 = "[(#)]";
public static final String ee_29 = "[(R)]";
public static final String ee_30 = "[({)]";
public static final String ee_31 = "[(})]";
public static final String ee_32 = "[(k)]";
public static final String ee_33 = "[(F)]";
public static final String ee_34 = "[(W)]";
public static final String ee_35 = "[(D)]";

private static final Factory spannableFactory = Spannable.Factory
.getInstance();

private static final Map<Pattern, Integer> emoticons = new HashMap<Pattern, Integer>();

static {

addPattern(emoticons, ee_1, R.drawable.ee_1);
addPattern(emoticons, ee_2, R.drawable.ee_2);
addPattern(emoticons, ee_3, R.drawable.ee_3);
addPattern(emoticons, ee_4, R.drawable.ee_4);
addPattern(emoticons, ee_5, R.drawable.ee_5);
addPattern(emoticons, ee_6, R.drawable.ee_6);
addPattern(emoticons, ee_7, R.drawable.ee_7);
addPattern(emoticons, ee_8, R.drawable.ee_8);
addPattern(emoticons, ee_9, R.drawable.ee_9);
addPattern(emoticons, ee_10, R.drawable.ee_10);
addPattern(emoticons, ee_11, R.drawable.ee_11);
addPattern(emoticons, ee_12, R.drawable.ee_12);
addPattern(emoticons, ee_13, R.drawable.ee_13);
addPattern(emoticons, ee_14, R.drawable.ee_14);
addPattern(emoticons, ee_15, R.drawable.ee_15);
addPattern(emoticons, ee_16, R.drawable.ee_16);
addPattern(emoticons, ee_17, R.drawable.ee_17);
addPattern(emoticons, ee_18, R.drawable.ee_18);
addPattern(emoticons, ee_19, R.drawable.ee_19);
addPattern(emoticons, ee_20, R.drawable.ee_20);
addPattern(emoticons, ee_21, R.drawable.ee_21);
addPattern(emoticons, ee_22, R.drawable.ee_22);
addPattern(emoticons, ee_23, R.drawable.ee_23);
addPattern(emoticons, ee_24, R.drawable.ee_24);
addPattern(emoticons, ee_25, R.drawable.ee_25);
addPattern(emoticons, ee_26, R.drawable.ee_26);
addPattern(emoticons, ee_27, R.drawable.ee_27);
addPattern(emoticons, ee_28, R.drawable.ee_28);
addPattern(emoticons, ee_29, R.drawable.ee_29);
addPattern(emoticons, ee_30, R.drawable.ee_30);
addPattern(emoticons, ee_31, R.drawable.ee_31);
addPattern(emoticons, ee_32, R.drawable.ee_32);
addPattern(emoticons, ee_33, R.drawable.ee_33);
addPattern(emoticons, ee_34, R.drawable.ee_34);
addPattern(emoticons, ee_35, R.drawable.ee_35);
}

private static void addPattern(Map<Pattern, Integer> map, String smile,
int resource) {
map.put(Pattern.compile(Pattern.quote(smile)), resource);
}

/**
* replace existing spannable with smiles
*
* @param context
* @param spannable
* @return
*/
public static boolean addSmiles(Context context, Spannable spannable) {
boolean hasChanges = false;
for (Entry<Pattern, Integer> entry : emoticons.entrySet()) {
Matcher matcher = entry.getKey().matcher(spannable);
while (matcher.find()) {
boolean set = true;
for (ImageSpan span : spannable.getSpans(matcher.start(),
matcher.end(), ImageSpan.class))
if (spannable.getSpanStart(span) >= matcher.start()
&& spannable.getSpanEnd(span) <= matcher.end())
spannable.removeSpan(span);
else {
set = false;
break;
}
if (set) {
hasChanges = true;
spannable.setSpan(new ImageSpan(context, entry.getValue()),
matcher.start(), matcher.end(),
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}
}
return hasChanges;
}

public static Spannable getSmiledText(Context context, CharSequence text) {
Spannable spannable = spannableFactory.newSpannable(text);
addSmiles(context, spannable);
return spannable;
}

public static boolean containsKey(String key) {
boolean b = false;
for (Entry<Pattern, Integer> entry : emoticons.entrySet()) {
Matcher matcher = entry.getKey().matcher(key);
if (matcher.find()) {
b = true;
break;
}
}

return b;
}
}

 
 

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  作者：欧阳鹏  欢迎转载，与人分享是进步的源泉！

  转载请保留原文地址：http://blog.csdn.net/ouyang_peng

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