phonegap 自动更新android app

       最近在做一个html5 的移动开发，用的是jqm和phonegap,用dw开发环境，并在新浪云上进行app的打包。但是现在由于需要做android安装程序自动下载更新，发现phonegap有下载的功能，但是没有自动安装的功能，所以只能想到用phonegap插件。用phonegap插件必须要在eclipse的开发环境下开发，搭建参考地址如下：
http://www.phonegapcn.com/developers/get-started-13/get-started搭建完毕后将phonegap.jar放到src的包下面。
        下面解决两个问题，一个是下载android安装程序，利用phonegap里api,FileTransfer。注意download 只能在英文官网里找到。下载js代码如下：

// JavaScript Document
$('#login').live("pageinit", function () {		
	document.addEventListener("deviceready", onDeviceReady, false);//phonegap绑定backbutton和获取终端信
	var sourcedir1="app";//下载一级目录
	var sourcedir2="update";//下载二级目录息
	//客户端下载地址
	var url="http://192.168.103.58:8080/mobile/test.apk";
	var source="test.apk";
	function onDeviceReady() {	
	window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function(fileSystem){     
					fileSystem.root.getDirectory(
						sourcedir1,
						{create:true,exclusive:false},
						function(entrydir){ 
							entrydir.getDirectory(
								sourcedir2,
								{create:true,exclusive:false},
								function(entrydir){
									entrydir.getFile(
										source,
										{create:true,exclusive:false}, 
									function(parent){
									var fileTransfer = new FileTransfer(); 
										var uri = encodeURI(url);
										fileTransfer.onprogress = function(progressEvent) {
										if (progressEvent.lengthComputable) {
									var percentLoaded = Math.round(100 * (progressEvent.loaded / progressEvent.total));
									var progressbarWidth = percentLoaded/2 + "%";
										//下载进度显示，可自己定义
						$.mobile.showPageLoadingMsg('a', "正在下载......  "+progressbarWidth,true);
										if(progressbarWidth=100){
											//设置延时
								setTimeout("$.mobile.hidePageLoadingMsg()",3000);
										}

										} else {
										loadingStatus.increment();
									}
								};
																						
									fileTransfer.download(
									uri,
									parent.fullPath,
									function(entry){ 
									//调用自动安装的插件	
		window.plugins.update.openFile(entry.fullPath,null,null);											
									},
									function(error) {alert("下载失败")}
								);
							},
						function(){alert("文件下载失败")}
					);
				},
			function(){alert("创建二级栏目失败")}
		);
},
function(){alert("创建一级目录失败");}
		); 
	}, function(evt){  
		console.log("加载文件系统出现错误");  
});
		  
}
		
	
 }); //pageshow
 
	  
   
  

        其中window.plugins.update.openFile(entry.fullPath,null,null);为调用phonegap插件js的代码，，下面解决第二个问题，即自动安装插件，该插件phonegap.jar1.9以上支持。插件js代码如下：

var Update = function(){};

Update.prototype.openFile = function(fullPath,onSuccess, onFail){
    cordova.exec(onSuccess, onFail, 'Update', 'openFile', [fullPath]);
};
Update.prototype.openApp = function(packageName,onSuccess, onFail){
    cordova.exec(onSuccess, onFail, 'Update', 'openApp', [packageName]);
};
if(!window.plugins) {
    window.plugins = {};
}
if (!window.plugins.update) {
    window.plugins.update = new Update();
}

       插件的java代码如下：

import java.io.File;
import java.util.List;

import org.apache.cordova.api.Plugin;
import org.apache.cordova.api.PluginResult;
import org.json.JSONArray;

import android.content.ComponentName;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.ResolveInfo;
import android.net.Uri;


public class Update extends Plugin {
	
	@Override
	public PluginResult execute(String action, JSONArray args, String callbackId) {
		PluginResult.Status status = PluginResult.Status.OK;
		if (action.equals("openFile")) {
			try {
				openFile(new File(args.getString(0).replaceAll("file://", "")));
			} catch(Exception e){
				return new PluginResult(PluginResult.Status.ERROR, "打开错误");
			}
		}
		else if(action.equals("openApp")){
			try
				{
				if(checkApp(args.getString(0))){
					openApp(args.getString(0));
				}
			else{
				//Log.d("openApp", "没有应用");
				return new PluginResult(PluginResult.Status.ERROR, "没有应用");
			}
				}
			catch(Exception e){
				//Log.d("openApp", "打开错误");
				return new PluginResult(PluginResult.Status.ERROR, "错误");
			}
		}
		return new PluginResult(status, "成功");
	}
	
	private void openApp(String packageName) throws NameNotFoundException {
		PackageManager pm=this.cordova.getActivity().getPackageManager();
		PackageInfo pi = pm.getPackageInfo(packageName, 0);

		Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);
		resolveIntent.addCategory(Intent.CATEGORY_LAUNCHER);
		resolveIntent.setPackage(pi.packageName);

		List<ResolveInfo> apps = pm.queryIntentActivities(resolveIntent, 0);

		ResolveInfo ri = apps.iterator().next();
		if (ri != null ) {
		String packageName1 = ri.activityInfo.packageName;
		String className = ri.activityInfo.name;

		Intent intent = new Intent(Intent.ACTION_MAIN);
		intent.addCategory(Intent.CATEGORY_LAUNCHER);

		ComponentName cn = new ComponentName(packageName1, className);

		intent.setComponent(cn);
		this.cordova.getActivity().startActivity(intent);
			}
		}
	
	private boolean checkApp(String packageName) {   
	    if (packageName == null || "".equals(packageName))   
	        return false;   
	    try {   
	        ApplicationInfo info = this.cordova.getActivity().getPackageManager().getApplicationInfo(   
	                packageName, PackageManager.GET_UNINSTALLED_PACKAGES);   
	        return true;   
	    } catch (NameNotFoundException e) {   
	        return false;   
	    }   
	} 

	private void openFile(File f) {
		Intent intent = new Intent(Intent.ACTION_VIEW);
		intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

		/* 调用getMIMEType()来取得MimeType */
		String type = getMIMEType(f);
		/* 设置intent的file与MimeType */
		intent.setDataAndType(Uri.fromFile(f), type);
		this.cordova.getActivity().startActivity(intent);
	}

	/* 判断文件MimeType的method */
	private String getMIMEType(File f) {
		String type = "";
		String fName = f.getName();
		/* 取得扩展名 */
		String end = fName
				.substring(fName.lastIndexOf(".") + 1, fName.length())
				.toLowerCase();

		/* 依扩展名的类型决定MimeType */
		if (end.equals("m4a") || end.equals("mp3") || end.equals("mid")
				|| end.equals("xmf") || end.equals("ogg") || end.equals("wav")) {
			type = "audio";
		} else if (end.equals("3gp") || end.equals("mp4")) {
			type = "video";
		} else if (end.equals("jpg") || end.equals("gif") || end.equals("png")
				|| end.equals("jpeg") || end.equals("bmp")) {
			type = "image";
		} else if (end.equals("apk")) {
			/* android.permission.INSTALL_PACKAGES */
			type = "application/vnd.android.package-archive";
		} else {
			type = "*";
		}
		/* 如果无法直接打开，就跳出软件列表给用户选择 */
		if (end.equals("apk")) {
		} else {
			type += "/*";
		}
		return type;
	}

}

       另外还需在工程根目录res->xml中的config.xml里面配置插件信息<plugin name="Update" value="your package.Update"/>。
        代码测试通过，如有疑问，欢迎大家留言指正交流。