用PHP开发Android应用的可行性探究

<code><?php //以下代码的意思就是,如果UserAgent不匹配,就输出Forbidden并退出
$ua = dirname(__FILE__).'/ua';
if( isset($_SERVER['HTTP_USER_AGENT']) 
    && file_exists($ua) 
    && $_SERVER['HTTP_USER_AGENT'] === trim(file_get_contents($ua)) ) {
    return false;
} else {
    exit('Forbidden');
}</code></code>

<code>bcmath calendar Core ctype curl date dom exif filter ftp gd hash json libxml mbstring mcrypt openssl pcre PDO pdo_sqlite Reflection session SimpleXML sockets SPL sqlite3 standard swoole xml xmlreader xmlwriter zip zlib</code>

<code>Java代码:
webview.addJavascriptInterface(new Object() {
    @JavascriptInterface
    public String getprop(String prop) {
        return java.lang.System.getProperties().getProperty(prop);;
    }
}, "android");

WebView里的HTML代码:
<a href="javascript:void(0)" onclick="alert(android.getprop('os.name'))">os.name</a></code>

<code>start.sh
#!/system/bin/sh
cd $1/php/bin
chmod 700 busybox
if [ ! -f php ]; then
    ./busybox xz -d file.tar.xz
    ./busybox tar xf file.tar && rm file.tar
    chmod 700 lib/ld php watcher qrencode
    ./busybox sed -i "s@/data/data/net.php.phpdroid@$1@g" php.ini
    ./busybox sed -i "s@/storage/self/primary@$2@g" php.ini
    cp resolv.conf $1/php/www
    cp hosts $1/php/www
fi
#随机生成UserAgent
./php -c php.ini ua.php
#获取可用端口
./php -c php.ini port.php
#开发调试时把网站根目录复制到SD卡,方便修改
# -t $1/php/www  实际应用的网站根目录
# -t $2/phpdroid 开发调试的网站根目录
if [ ! -d $2/phpdroid ]; then cp -R $1/php/www $2/phpdroid; fi
#启动PHP服务
$1/php/bin/php \
-c php.ini \
-S 127.0.0.2:`cat $1/php/bin/port` \
-t $2/phpdroid \
$1/php/bin/auth.php \
>/dev/null 2>&1 &
#记录PHP的PID
echo $! > pid
#监听,发现文件auth.php被删除,则关闭PHP进程
$1/php/bin/watcher $1/php/bin/auth.php >/dev/null 2>&1 &
#记录watcher的PID
echo $! > pid_watcher
return 0

stop.sh
#!/system/bin/sh
ua=$1/php/bin/ua
if [ -e $ua ]; then
    rm $ua
fi
port=$1/php/bin/port
if [ -e $port ]; then
    rm $port
fi
pid=$1/php/bin/pid
if [ -e $pid ]; then
    kill -9 `cat $pid`
    rm $pid
fi
pid=$1/php/bin/pid_watcher
if [ -e $pid ]; then
    kill -9 `cat $pid`
    rm $pid
fi
return 0

ua.php
<?php $ua = 'Mozilla/5.0 (Linux; Android; PHPDroid) AppleWebKit (KHTML, like Gecko) Chrome Mobile Safari';
file_put_contents(dirname(__FILE__).'/ua', $ua.' '.sha1(uniqid(mt_rand(), true)));

port.php
<?php
//PHP用 fsockopen 检测端口是否被占用,返回可用端口.
$port = 8181;
while ( $fp = @fsockopen('127.0.0.2', $port, $errno, $errstr, 1) ) {
    fclose($fp);
    $port++;
}
file_put_contents(dirname(__FILE__).'/port', $port);

MainActivity.java 在 onCreate 时启动 WebView 如下:
webview = new WebView(this);
webview.getSettings().setUserAgentString(ua);
webview.getSettings().setJavaScriptEnabled(true);
webview.setWebChromeClient(new WebChromeClient());
webview.setWebViewClient(new WebViewClient() {
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        view.loadUrl(url);
        return true;
    }
});
webview.loadUrl("http://127.0.0.2:" + port);
setContentView(webview);</code></code>