参考博客
Android版本要求及H5 api支持情况
在Android版本4.4之前，由于维护和开发Android版本时使用的是AppleWebkit开源内核，虽然也非常不错，但不支持许多html5 api,在Android4.4使用了Chromium才得以发展，
目前支持的html 5如下：
| Web Workers | 支持 | javaScript多线程 |
| WebSocket | 支持 | javascript套接字，TCP长链接 |
| IDBFactory/indexDB | 支持 | 索引数据库 |
| ApplicationCache | 支持 | web离线缓存 |
| postMessage/onMessage | 支持 | 收发消息 |
| ondeviceorientation,ondevicemotion,onorientationchange | 支持 | 屏幕旋转，移动 |
| onvolumechange | 支持 | 声音改变 |
| RequestAnimationFrame | 支持 | 页面UI动画更新引擎 |
| LocalStorage/sessionStorage | 支持 | 本地缓存 |
| FileReader | 支持 | 本地文件读取 |
| FormData | 支持 | 模拟表单，表单模型 |
| EventSource | 支持 | Server-Sent Events(SSE)功能，允许服务端推送数据到客户端。(通常叫数据推送) |
| CacheStorage | 不支持 | 异步缓存 |
| Promise | 不支持 | 异步范式 |
| Crypto | 不支持 | javascript加密API |
| WebAudio | 不支持 | 流媒体播放 |
| WebRTC | 不支持 | 流媒体通讯 |
| WebGL | 不支持 | Web GL图像框架 |
| GeoLocation | 支持 | 地理定位 |
| Notification | 不支持 | web通知 |
| Blob | 支持 | 二进制数据对象 |
在这里我们主要了解WebSocket在Android WebView上的支持，这里给出一个基于php WebSocketServer的例子：
【以下例子来自开源中国博客】
体验位置：http://www.yxsss.com/ui/sk.html
（请使用你的PC浏览器和你的Android4.4的设备上的浏览器）
WebSocket Server端实现
php端
<?php
error_reporting(E_ALL ^ E_NOTICE);
ob_implicit_flush();
class Sock{
public $sockets;
public $users;
public $master;
private $rec_data_packets=array();//已接收的数据
private $sum_length=array();//数据总长度
private $rec_data_length=array();//接收数据的长度
private $salt_key=array();//加密key
private $per_data_len=array(); //每组数据长度
public function __construct($address, $port,$maxLink=16){
$this->master=$this->createSocketServer($address, $port,$maxLink);
$this->sockets=array($this->master);
}
function run()
{
while(true){
$changes=$this->sockets;
$write=NULL;
$except=NULL;
socket_select($changes,$write,$except,NULL);
/**
* 监听读写操作，socket_select (array &$read, array &$write, array &$except, $tv_sec, $tv_usec = null)
* $read 注意，这里使用了引用，$read表示要监听读操作的socket，socket_select可以调用多次，之前监听的socket不会被取消（注意，socket连接也是read）
* $write 注意，这里使用了引用，$read表示要监听写操作的socket，socket_select可以调用多次，之前监听的socket不会被取消
* $$except 监听异常的socket
* 以上&read,&write,&except是被引用的，也就意味着变量的值可以输入输出，把监听到的socket输出，把想被监听的socket输入
* 最后一个参数是超时时间，默认是0
*
* 该函数会阻塞
*/
foreach($changes as $sock){
if($sock==$this->master){
/**
* 接受客户端socket
* @var unknown
*/
$client=socket_accept($this->master);
$key=uniqid();
$this->sockets[]=$client;
$this->users[$key]=array(
'socket'=>$client,
'handshake'=>false
);
}else{
$len=0;
$buffer='';
do{
$l=socket_recv($sock,$buf,1000,0);
$len+=$l;
$buffer.=$buf;
}while($l==1000);
$k=$this->search($sock);
if($len<7){
$this->send2($k);
continue;
}
if(!$this->users[$k]['handshake']){
$this->handshake($k,$buffer);
}else{
$buffer = $this->uncode($buffer,$k);
if($buffer==false){
continue;
}
$this->send($k,$buffer);
}
}
}
}
}
function close($k){
socket_close($this->users[$k]['socket']);
unset($this->users[$k]);
$this->sockets=array($this->master);
foreach($this->users as $v){
$this->sockets[]=$v['socket'];
}
$this->e("key:$k close");
}
function search($sock){
foreach ($this->users as $k=>$v){
if($sock==$v['socket'])
return $k;
}
return false;
}
/**
*
* @param string $address 地址
* @param int $port 端口
* @param number $maxLink 最大连接数
*/
function createSocketServer($address,$port,$maxLink=16){
$server = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_set_option($server, SOL_SOCKET, SO_REUSEADDR, 1);
socket_bind($server, $address, $port);
socket_listen($server,$maxLink);
$this->e('Server Started : '.date('Y-m-d H:i:s'));
$this->e('Listening on : '.$address.' port '.$port);
return $server;
}
/**
* 握手
* @param string $k 要握手的socket
* @param byte $buffer 缓冲数据
* @return boolean
*/
function handshake($k,$buffer){
$buf = substr($buffer,strpos($buffer,'Sec-WebSocket-Key:')+18);
$key = trim(substr($buf,0,strpos($buf,"\r\n")));
$new_key = base64_encode(sha1($key."258EAFA5-E914-47DA-95CA-C5AB0DC85B11",true));
$new_message = "HTTP/1.1 101 Switching Protocols\r\n";
$new_message .= "Upgrade: websocket\r\n";
$new_message .= "Sec-WebSocket-Version: 13\r\n";
$new_message .= "Connection: Upgrade\r\n";
$new_message .= "Sec-WebSocket-Accept: " . $new_key . "\r\n\r\n";
socket_write($this->users[$k]['socket'],$new_message,strlen($new_message));
$this->users[$k]['handshake']=true;
return true;
}
function uncode($str,$key){
$mask = array();
$data = '';
$msg = unpack('H*',$str);
$head = substr($msg[1],0,2);
if ($head == '81' && !isset($this->sum_length[$key])) {
$len=substr($msg[1],2,2);
$len=hexdec($len);
if(substr($msg[1],2,2)=='fe'){
$len=substr($msg[1],4,4);
$len=hexdec($len);
$msg[1]=substr($msg[1],4);
}else if(substr($msg[1],2,2)=='ff'){
$len=substr($msg[1],4,16);
$len=hexdec($len);
$msg[1]=substr($msg[1],16);
}
$mask[] = hexdec(substr($msg[1],4,2));
$mask[] = hexdec(substr($msg[1],6,2));
$mask[] = hexdec(substr($msg[1],8,2));
$mask[] = hexdec(substr($msg[1],10,2));
$s = 12;
$n=0;
}else if($this->sum_length[$key] > 0){
$len=$this->sum_length[$key];
$mask=$this->salt_key[$key];
$n=$this->per_data_len[$key];
$s = 0;
}
$e = strlen($msg[1])-2;
for ($i=$s; $i<= $e; $i+= 2) {
$data .= chr($mask[$n%4]^hexdec(substr($msg[1],$i,2)));
$n++;
}
$dlen=strlen($data);
if($len > 255 && $len > $dlen+intval($this->rec_data_length[$key])){
$this->salt_key[$key]=$mask;
$this->sum_length[$key]=$len;
$this->rec_data_length[$key]=$dlen+intval($this->rec_data_length[$key]);
$this->rec_data_packets[$key]=$this->rec_data_packets[$key].$data;
$this->per_data_len[$key]=$n;
return false;
}else{
unset($this->salt_key[$key],$this->sum_length[$key],$this->rec_data_length[$key],$this->per_data_len[$key]);
$data=$this->rec_data_packets[$key].$data;
unset($this->rec_data_packets[$key]);
return $data;
}
}
function code($msg){
$frame = array();
$frame[0] = '81';
$len = strlen($msg);
if($len < 126){
$frame[1] = $len<16?'0'.dechex($len):dechex($len);
}else if($len < 65025){
$s=dechex($len);
$frame[1]='7e'.str_repeat('0',4-strlen($s)).$s;
}else{
$s=dechex($len);
$frame[1]='7f'.str_repeat('0',16-strlen($s)).$s;
}
$frame[2] = $this->ord_hex($msg);
$data = implode('',$frame);
return pack("H*", $data);
}
function ord_hex($data) {
$msg = '';
$l = strlen($data);
for ($i= 0; $i<$l; $i++) {
$msg .= dechex(ord($data{$i}));
}
return $msg;
}
//用户加入
function send($k,$msg){
parse_str($msg,$g);
$ar=array();
if($g['type']=='add'){
$this->users[$k]['name']=$g['ming'];
$ar['type']='add';
$ar['name']=$g['ming'];
$key='all';
}else{
$ar['nrong']=$g['nr'];
$key=$g['key'];
}
$this->send1($k,$ar,$key);
}
function getusers(){
$ar=array();
foreach($this->users as $k=>$v){
$ar[]=array('code'=>$k,'name'=>$v['name']);
}
return $ar;
}
/**
* @param string $k 发信息人的code
* @param string $ar 数据
* @param string $key 接受人的 code
*/
function send1($k,$ar,$key='all'){
$ar['code1']=$key;
$ar['code']=$k;
$ar['time']=date('m-d H:i:s');
$str = $this->code(json_encode($ar));
if($key=='all'){
$users=$this->users;
if($ar['type']=='add'){
$ar['type']='madd';
$ar['users']=$this->getusers();
$str1 = $this->code(json_encode($ar));
socket_write($users[$k]['socket'],$str1,strlen($str1));
unset($users[$k]);
}
foreach($users as $v){
socket_write($v['socket'],$str,strlen($str));
}
}else{
socket_write($this->users[$k]['socket'],$str,strlen($str));
socket_write($this->users[$key]['socket'],$str,strlen($str));
}
}
//用户退出
function send2($k){
$this->close($k);
$ar['type']='rmove';
$ar['nrong']=$k;
$this->send1(false,$ar,'all');
}
function e($str){
//$path=dirname(__FILE__).'/log.txt';
$str=$str."\n";
//error_log($str,3,$path);
echo iconv('utf-8','gbk//IGNORE',$str);
}
}
$sk=new Sock('127.0.0.1',8000);
$sk->run();
?>WebSocket Client端实现
client端
<!doctype html> <html> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no"/> <title>HTML5 websocket 网页聊天室 javascript php</title> <style type="text/css"> body,p{margin:0px; padding:0px; font-size:14px; color:#333; font-family:Arial, Helvetica, sans-serif;} #ltian,.rin{width:98%; margin:5px auto;} #ltian{border:1px #ccc solid;overflow-y:auto; overflow-x:hidden; position:relative;} #ct{margin-right:111px; height:100%;overflow-y:auto;overflow-x: hidden;} #us{width:110px; overflow-y:auto; overflow-x:hidden; float:right; border-left:1px #ccc solid; height:100%; background-color:#F1F1F1;} #us p{padding:3px 5px; color:#08C; line-height:20px; height:20px; cursor:pointer; overflow:hidden; white-space:nowrap; text-overflow:ellipsis;} #us p:hover,#us p:active,#us p.ck{background-color:#069; color:#FFF;} #us p.my:hover,#us p.my:active,#us p.my{color:#333;background-color:transparent;} button{float:right; width:80px; height:35px; font-size:18px;} input{width:100%; height:30px; padding:2px; line-height:20px; outline:none; border:solid 1px #CCC;} .rin p{margin-right:160px;} .rin span{float:right; padding:6px 5px 0px 5px; position:relative;} .rin span img{margin:0px 3px; cursor:pointer;} .rin span form{position:absolute; width:25px; height:25px; overflow:hidden; opacity:0; top:5px; right:5px;} .rin span input{width:180px; height:25px; margin-left:-160px; cursor:pointer} #ct p{padding:5px; line-height:20px;} #ct a{color:#069; cursor:pointer;} #ct span{color:#999; margin-right:10px;} .c2{color:#999;} .c3{background-color:#DBE9EC; padding:5px;} .qp{position:absolute; font-size:12px; color:#666; top:5px; right:130px; text-decoration:none; color:#069;} #ems{position:absolute; z-index:5; display:none; top:0px; left:0px; max-width:230px; background-color:#F1F1F1; border:solid 1px #CCC; padding:5px;} #ems img{width:44px; height:44px; border:solid 1px #FFF; cursor:pointer;} #ems img:hover,#ems img:active{border-color:#A4B7E3;} #ems a{color:#069; border-radius:2px; display:inline-block; margin:2px 5px; padding:1px 8px; text-decoration:none; background-color:#D5DFFD;} #ems a:hover,#ems a:active,#ems a.ck{color:#FFF; background-color:#069;} .tc{text-align:center; margin-top:5px;} </style> </head> <body> <div id="ltian"> <div id="us" class="jb"></div> <div id="ct"></div> <a href="javascript:;" class="qp" onClick="this.parentNode.children[1].innerHTML=''">清屏</a> </div> <div class="rin"> <button id="sd">发送</button> <span><img src="http://www.yxsss.com/ui/sk/t.png" title="表情" id="imgbq"><img src="http://www.yxsss.com/ui/sk/e.png" title="上传图片"><form><input type="file" title="上传图片" id="upimg"></form></span> <p><input id="nrong"></p> </div> <div id="ems"><p></p><p class="tc"></p></div> <script> if(typeof(WebSocket)=='undefined'){ alert('你的浏览器不支持 WebSocket ，推荐使用Google Chrome 或者 Mozilla Firefox'); } </script> <script src="http://www.yxsss.com/ui/p/a.js" type="text/javascript"></script> <script> (function(){ var key='all',mkey; var users={}; var url='ws://127.0.0.1:8000'; var so=false,n=false; var lus=A.$('us'),lct=A.$('ct'); function st(){ n=prompt('请给自己取一个响亮的名字：'); n=n.substr(0,16); if(!n){ return ; } so=new WebSocket(url); so.onopen=function(){ if(so.readyState==1){ so.send('type=add&ming='+n); } } so.onclose=function(){ so=false; lct.appendChild(A.$$('<p class="c2">退出聊天室</p>')); } so.onmessage=function(msg){ eval('var da='+msg.data); var obj=false,c=false; if(da.type=='add'){ var obj=A.$$('<p>'+da.name+'</p>'); lus.appendChild(obj); cuser(obj,da.code); obj=A.$$('<p><span>['+da.time+']</span>欢迎<a>'+da.name+'</a>加入</p>'); c=da.code; }else if(da.type=='madd'){ mkey=da.code; da.users.unshift({'code':'all','name':'大家'}); for(var i=0;i<da.users.length;i++){ var obj=A.$$('<p>'+da.users[i].name+'</p>'); lus.appendChild(obj); if(mkey!=da.users[i].code){ cuser(obj,da.users[i].code); }else{ obj.className='my'; document.title=da.users[i].name; } } obj=A.$$('<p><span>['+da.time+']</span>欢迎'+da.name+'加入</p>'); users.all.className='ck'; } if(obj==false){ if(da.type=='rmove'){ var obj=A.$$('<p class="c2"><span>['+da.time+']</span>'+users[da.nrong].innerHTML+'退出聊天室</p>'); lct.appendChild(obj); users[da.nrong].del(); delete users[da.nrong]; }else{ da.nrong=da.nrong.replace(/{\\(\d+)}/g,function(a,b){ return '<img src="sk/'+b+'.gif">'; }).replace(/^data\:image\/png;base64\,.{50,}$/i,function(a){ return '<img src="'+a+'">'; }); //da.code 发信息人的code if(da.code1==mkey){ obj=A.$$('<p class="c3"><span>['+da.time+']</span><a>'+users[da.code].innerHTML+'</a>对我说：'+da.nrong+'</p>'); c=da.code; }else if(da.code==mkey){ if(da.code1!='all') obj=A.$$('<p class="c3"><span>['+da.time+']</span>我对<a>'+users[da.code1].innerHTML+'</a>说：'+da.nrong+'</p>'); else obj=A.$$('<p><span>['+da.time+']</span>我对<a>'+users[da.code1].innerHTML+'</a>说：'+da.nrong+'</p>'); c=da.code1; }else if(da.code==false){ obj=A.$$('<p><span>['+da.time+']</span>'+da.nrong+'</p>'); }else if(da.code1){ obj=A.$$('<p><span>['+da.time+']</span><a>'+users[da.code].innerHTML+'</a>对'+users[da.code1].innerHTML+'说：'+da.nrong+'</p>'); c=da.code; } } } if(c){ obj.children[1].onclick=function(){ users[c].onclick(); } } lct.appendChild(obj); lct.scrollTop=Math.max(0,lct.scrollHeight-lct.offsetHeight); } } A.$('sd').onclick=function(){ if(!so){ return st(); } var da=A.$('nrong').value.trim(); if(da==''){ alert('内容不能为空'); return false; } A.$('nrong').value=''; so.send('nr='+esc(da)+'&key='+key); } A.$('nrong').onkeydown=function(e){ var e=e||event; if(e.keyCode==13){ A.$('sd').onclick(); } } function esc(da){ da=da.replace(/</g,'<').replace(/>/g,'>').replace(/\"/g,'"'); return encodeURIComponent(da); } function cuser(t,code){ users=t;
t.onclick=function(){
t.parentNode.children.rcss('ck','');
t.rcss('','ck');
key=code;
}
}
A.$('ltian').style.height=(document.documentElement.clientHeight - 70)+'px';
st();var bq=A.$('imgbq'),ems=A.$('ems');
var l=80,r=4,c=5,s=0,p=Math.ceil(l/(r*c));
var pt='sk/';
bq.onclick=function(e){
var e=e||event;
if(!so){
return st();
}
ems.style.display='block';
document.onclick=function(){
gb();
}
ct();
try{e.stopPropagation();}catch(o){}
}for(var i=0;i<p;i++){
var a=A.$$('<a href="javascript:;">'+(i+1)+'</a>');
ems.children[1].appendChild(a);
ef(a,i);
}
ems.children[1].children[0].className='ck';function ct(){
var wz=bq.weiz();
with(ems.style){
top=wz.y-242+'px';
left=wz.x+bq.offsetWidth-235+'px';
}
}function ef(t,i){
t.onclick=function(e){
var e=e||event;
s=i*r*c;
ems.children[0].innerHTML='';
hh();
this.parentNode.children.rcss('ck','');
this.rcss('','ck');
try{e.stopPropagation();}catch(o){}
}
}function hh(){
var z=Math.min(l,s+r*c);
for(var i=s;i<z;i++){
var a=A.$$('<img src="'+pt+i+'.gif">');
hh1(a,i);
ems.children[0].appendChild(a);
}
ct();
}function hh1(t,i){
t.onclick=function(e){
var e=e||event;
A.$('nrong').value+='{\\'+i+'}';
if(!e.ctrlKey){
gb();
}
try{e.stopPropagation();}catch(o){}
}
}function gb(){
ems.style.display='';
A.$('nrong').focus();
document.onclick='';
}
hh();
A.on(window,'resize',function(){
A.$('ltian').style.height=(document.documentElement.clientHeight - 70)+'px';
ct();
})var fimg=A.$('upimg');
var img=new Image();
var dw=400,dh=300;
A.on(fimg,'change',function(ev){
if(!so){
st();
return false;
}
if(key=='all'){
alert('由于资源限制 发图只能私聊');
return false;
}
var f=ev.target.files[0];
if(f.type.match('image.*')){
var r = new FileReader();
r.onload = function(e){
img.setAttribute('src',e.target.result);
};
r.readAsDataURL(f);
}
});
img.onload=function(){
ih=img.height,iw=img.width;
if(iw/ih > dw/dh && iw > dw){
ih=ih/iw*dw;
iw=dw;
}else if(ih > dh){
iw=iw/ih*dh;
ih=dh;
}
var rc = A.$$('canvas');
var ct = rc.getContext('2d');
rc.width=iw;
rc.height=ih;
ct.drawImage(img,0,0,iw,ih);
var da=rc.toDataURL();
so.send('nr='+esc(da)+'&key='+key);
}})();
</script>
</body>
</html>
