本文实例讲述了android编程实现qq表情的发送和接收。分享给大家供大家参考，具体如下：
在自己做一个聊天应用练习的时候，需要用到表情，于是就想着模仿一下qq表情，图片资源完全copy的qq.apk，解压就可以得到，这里不细说。
下面将该应用中的表情模块功能抽离出来，以便自己以后复习回顾。。
先看一下效果图：
首先进入界面：（完全仿照qq）
点击一下上面的表情图标：
选择一些表情，输入一些文字混合：
点击发送：
可以看到文字和表情图片都一起显示出来了。
下面列出一些关键代码：
表情工具类expressionutil:
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public class expressionutil {
/**
* 对spanablestring进行正则判断，如果符合要求，则以表情图片代替
* @param context
* @param spannablestring
* @param patten
* @param start
* @throws securityexception
* @throws nosuchfieldexception
* @throws numberformatexception
* @throws illegalargumentexception
* @throws illegalaccessexception
*/
public static void dealexpression(context context,spannablestring spannablestring, pattern patten, int start) throws securityexception, nosuchfieldexception, numberformatexception, illegalargumentexception, illegalaccessexception {
matcher matcher = patten.matcher(spannablestring);
while (matcher.find()) {
string key = matcher.group();
if (matcher.start() < start) {
continue;
}
field field = r.drawable.class.getdeclaredfield(key);
int resid = integer.parseint(field.get(null).tostring()); //通过上面匹配得到的字符串来生成图片资源id
if (resid != 0) {
bitmap bitmap = bitmapfactory.decoderesource(context.getresources(), resid);
imagespan imagespan = new imagespan(bitmap); //通过图片资源id来得到bitmap，用一个imagespan来包装
int end = matcher.start() + key.length(); //计算该图片名字的长度，也就是要替换的字符串的长度
spannablestring.setspan(imagespan, matcher.start(), end, spannable.span_inclusive_exclusive); //将该图片替换字符串中规定的位置中
if (end < spannablestring.length()) { //如果整个字符串还未验证完，则继续。。
dealexpression(context,spannablestring, patten, end);
}
break;
}
}
}
/**
* 得到一个spanablestring对象，通过传入的字符串,并进行正则判断
* @param context
* @param str
* @return
*/
public static spannablestring getexpressionstring(context context,string str,string zhengze){
spannablestring spannablestring = new spannablestring(str);
pattern sinapatten = pattern.compile(zhengze, pattern.case_insensitive); //通过传入的正则表达式来生成一个pattern
try {
dealexpression(context,spannablestring, sinapatten, 0);
} catch (exception e) {
log.e("dealexpression", e.getmessage());
}
return spannablestring;
}
}
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在显示聊天页面的list的适配器中，我们需要做如下的显示，即调用上面工具类的方法：
simplechatadapter中的内部类viewholder：
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private class viewholder{
relativelayout chat_layout;
imageview image;
textview text;
public viewholder(view convertview){
chat_layout=(relativelayout) convertview.findviewbyid(r.id.team_singlechat_id_listiteam);
image=(imageview) convertview.findviewbyid(r.id.team_singlechat_id_listiteam_headicon);
text=(textview) convertview.findviewbyid(r.id.team_singlechat_id_listiteam_message);
}
public void setdata(messageinfo msg){
relativelayout.layoutparams rl_chat_left=((relativelayout.layoutparams)chat_layout.getlayoutparams());
relativelayout.layoutparams rl_tv_msg_left=((relativelayout.layoutparams)text.getlayoutparams());
relativelayout.layoutparams rl_iv_headicon_left=((relativelayout.layoutparams)image.getlayoutparams());
if(!dicqconstant.defaultmac.equalsignorecase(msg.getusermac())){ //根据本地的mac地址来判断该条信息是属于本人所说还是对方所说
//如果是自己说的，则显示在右边；如果是对方所说，则显示在左边
rl_chat_left.addrule(relativelayout.align_parent_left,-1);
rl_chat_left.addrule(relativelayout.align_parent_right,0);
rl_iv_headicon_left.addrule(relativelayout.align_parent_left,-1);
rl_iv_headicon_left.addrule(relativelayout.align_parent_right,0);
rl_tv_msg_left.addrule(relativelayout.right_of,r.id.team_singlechat_id_listiteam_headicon);
rl_tv_msg_left.addrule(relativelayout.left_of,0);
text.setbackgroundresource(r.drawable.balloon_l_selector);
}else{
rl_chat_left.addrule(relativelayout.align_parent_left,0);
rl_chat_left.addrule(relativelayout.align_parent_right,-1);
rl_iv_headicon_left.addrule(relativelayout.align_parent_left,0);
rl_iv_headicon_left.addrule(relativelayout.align_parent_right,-1);
rl_tv_msg_left.addrule(relativelayout.right_of,0);
rl_tv_msg_left.addrule(relativelayout.left_of,r.id.team_singlechat_id_listiteam_headicon);
text.setbackgroundresource(r.drawable.balloon_r_selector);
}
image.setimageresource(prortaitutils.conversionidtores(msg.getprotrait())); //设置头像
string str = msg.getmsg(); //消息具体内容
string zhengze = "f0[0-9]{2}|f10[0-7]"; //正则表达式，用来判断消息内是否有表情
try {
spannablestring spannablestring = expressionutil.getexpressionstring(context, str, zhengze);
text.settext(spannablestring);
} catch (numberformatexception e) {
e.printstacktrace();
} catch (securityexception e) {
e.printstacktrace();
} catch (illegalargumentexception e) {
e.printstacktrace();
}
}
}
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关于表情弹出框的实现如下：
mainactivity：
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/**
* 创建一个表情选择对话框
*/
private void createexpressiondialog() {
builder = new dialog(mainactivity.this);
gridview gridview = creategridview();
builder.setcontentview(gridview);
builder.settitle("默认表情");
builder.show();
gridview.setonitemclicklistener(new onitemclicklistener() {
@override
public void onitemclick(adapterview<?> arg0, view arg1, int arg2,
long arg3) {
bitmap bitmap = null;
bitmap = bitmapfactory.decoderesource(getresources(), imageids[arg2 % imageids.length]);
imagespan imagespan = new imagespan(mainactivity.this, bitmap);
string str = null;
if(arg2<10){
str = "f00"+arg2;
}else if(arg2<100){
str = "f0"+arg2;
}else{
str = "f"+arg2;
}
spannablestring spannablestring = new spannablestring(str);
spannablestring.setspan(imagespan, 0, 4, spannable.span_exclusive_exclusive);
edit.append(spannablestring);
builder.dismiss();
}
});
}
/**
* 生成一个表情对话框中的gridview
* @return
*/
private gridview creategridview() {
final gridview view = new gridview(this);
list<map<string,object>> listitems = new arraylist<map<string,object>>();
//生成107个表情的id，封装
for(int i = 0; i < 107; i++){
try {
if(i<10){
field field = r.drawable.class.getdeclaredfield("f00" + i);
int resourceid = integer.parseint(field.get(null).tostring());
imageids[i] = resourceid;
}else if(i<100){
field field = r.drawable.class.getdeclaredfield("f0" + i);
int resourceid = integer.parseint(field.get(null).tostring());
imageids[i] = resourceid;
}else{
field field = r.drawable.class.getdeclaredfield("f" + i);
int resourceid = integer.parseint(field.get(null).tostring());
imageids[i] = resourceid;
}
} catch (numberformatexception e) {
e.printstacktrace();
} catch (securityexception e) {
e.printstacktrace();
} catch (illegalargumentexception e) {
e.printstacktrace();
} catch (nosuchfieldexception e) {
e.printstacktrace();
} catch (illegalaccessexception e) {
e.printstacktrace();
}
map<string,object> listitem = new hashmap<string,object>();
listitem.put("image", imageids[i]);
listitems.add(listitem);
}
simpleadapter simpleadapter = new simpleadapter(this, listitems, r.layout.team_layout_single_expression_cell, new string[]{"image"}, new int[]{r.id.image});
view.setadapter(simpleadapter);
view.setnumcolumns(6);
view.setbackgroundcolor(color.rgb(214, 211, 214));
view.sethorizontalspacing(1);
view.setverticalspacing(1);
view.setlayoutparams(new layoutparams(layoutparams.fill_parent,layoutparams.wrap_content));
view.setgravity(gravity.center);
return view;
}
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完整实例代码代码点击此处本站下载。
希望本文所述对大家android程序设计有所帮助。