Phonegap开发的前后台数据交互

在用Phonegap开发时，需要进行前后台数据交互，在网上找资料，很多东西让人一头雾水，最后借鉴了下面的博客：

http://blog.sina.com.cn/s/blog_681929ae010177qt.html

才实现了一个简单数据交互

1：定义名称为FilePlugin的 Class文件继承自Plugin；需要实现execute方法

package qj;

import org.json.JSONArray;

import android.webkit.WebSettings.PluginState;

import com.phonegap.api.Plugin;
import com.phonegap.api.PluginResult;

public class FilePlugin extends Plugin{//继承

    @Override
    public PluginResult execute(String action, JSONArray args, String callbackId)
    {
        PluginResult pr=new PluginResult(PluginResult.Status.OK, "进入");
         String ls=action;
         String lss=args.toString();

        try {
            ls = java.net.URLDecoder.decode(ls,"UTF-8");
            lss = new String(lss.getBytes("iso-8859-1"),"utf-8");
            lss = java.net.URLDecoder.decode(lss,"UTF-8");

            if (action.equals("createFile")) {
                String filePath = "文件路径！";
                pr=new PluginResult(PluginResult.Status.OK,filePath);

                }
            if(action.equals("read")){
                pr=new PluginResult(PluginResult.Status.OK, "文件读取");

                }
        } catch (Exception e) {
            return new PluginResult(PluginResult.Status.ERROR,e.getMessage());
        }
        return pr;

    }

}

2：定义名称为file的js文件，用以实现方法并且注册成为Phonegap的插件。

var FilePlugin = function(){};
FilePlugin.prototype.write = function(fileName, content, successCallback, failureCallback){
return PhoneGap.exec(successCallback, failureCallback, "FilePlugin", "write", [fileName, content]);
};

FilePlugin.prototype.overWrite = function(srcName, destName,successCallback, failureCallback){
return PhoneGap.exec(successCallback, failureCallback, "FilePlugin", "orverwrite", [srcName, destName]);
};

FilePlugin.prototype.read = function(filePath,successCallback, failureCallback){
return PhoneGap.exec(successCallback, failureCallback, "FilePlugin", "read", [filePath]);
};

//注册插件
PhoneGap.addConstructor(function(){
PhoneGap.addPlugin("file", new FilePlugin());
});

3：管理Class文件与Js文件

在xml中的plugins.xml中配置

name="类名称"

value="命名空间"

<plugin name="FilePlugin" value="qj.FilePlugin"/>

4：页面调用

<script type="text/javascript" charset="utf-8" src="phonegap.js"></script>
<script type="text/javascript" charset="UTF-8" src="phonegap-1.0.0.js"></script>
<script type="text/javascript" charset="UTF-8" src="file.js"></script>
<script type="text/javascript" charset="UTF-8">

function read(){
window.plugins.file.read("file.txt", success, failure);
var arg= encodeURI(encodeURI("中文"));
arg= "中文";
//FilePlugin.prototype.read(arg, success, failure);
}
function success(r){
alert("success:"+r);
};
function failure(e){
alert("failure:"+e);
};
</script>

<button onclick="read()">read Some</button>