PhoneGap实现javascript脚本调用本地设备的接口

来源：互联网发布：淘宝宝贝下载编辑：程序博客网时间：2024/05/16 17:34

通过ajax发送请求，实现脚本对设备发送消息；设备接受到消息处理后通过webView的loadUrl方法（这是Android系统下的浏览器控件对象）执行脚本实现脚本的回调。

1、

xmlhttp.open("GET", "http://127.0.0.1:"+PhoneGap.JSCallbackPort+"/"+PhoneGap.JSCallbackToken , true);

这是phonegap.js里面的代码，通过ajax请求，发送消息给设备。

2、

active = true;  
            ServerSocket waitSocket = new ServerSocket(0);  
            port = waitSocket.getLocalPort();  
            token = UUID.randomUUID().toString();  
            while(active)   
            {  
                Socket connection = waitSocket.accept();  
                BufferedReader xhrReader = new BufferedReader(new InputStreamReader(connection.getInputStream()), 40);  
                DataOutputStream output = new DataOutputStream(connection.getOutputStream());  
                String request = xhrReader.readLine();  
                String response = "";  
                if(active && request != null)  
                {  
                    if(request.contains("GET"))  
                    {  
                        String requestParts[] = request.split(" ");  
                        if(requestParts.length == 3 && requestParts[1].substring(1).equals(token))  
                        {  
                            synchronized(this)  
                            {  
                                do  
                                {  
                                    if(!empty)  
                                        break;  
                                    try  
                                    {  
                                        wait(10000L);  
                                        break;  
                                    }  
                                    catch(Exception e) { }  
                                } while(true);  
                            }  
                            if(active)  
                            {  
                                if(empty)  
                                {  
                                    response = "HTTP/1.1 404 NO DATA\r\n\r\n ";  
                                } else  
                                {  
                                    response = "HTTP/1.1 200 OK\r\n\r\n";  
                                    String js = getJavascript();  
                                    if(js != null)  
                                        response = (new StringBuilder()).append(response).append(URLEncoder.encode(js, "UTF-8")).toString();  
                                }  
                            } else  
                            {  
                                response = "HTTP/1.1 503 Service Unavailable\r\n\r\n ";  
                            }  
                        } else  
                        {  
                            response = "HTTP/1.1 403 Forbidden\r\n\r\n ";  
                        }  
                    } else  
                    {  
                        response = "HTTP/1.1 400 Bad Request\r\n\r\n ";  
                    }  
                    output.writeBytes(response);  
                    output.flush();  
                }  
                output.close();  
                xhrReader.close();

这是java代码，监听javascript代码发送过来的请求

3、

appView.loadUrl("javascript:PhoneGap....");

通过loadUrl来执行javascript代码。