安卓自动更新功能实现+安卓调用默认浏览器打开指定URL

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

Intent intent = new Intent();
intent.setAction("android.intent.action.VIEW");
Uri content_url = Uri.parse("http://www.baidu.com");
intent.setData(content_url);
startActivity(intent);打开浏览器
System.exit(0);//退出当前APP

打开指定网页 注意加

自动更新原理

APP有一个叫版本号的属性  对比远程服务器上的版本号

如果服务器上的版本号>APP版本 则根据服务器上的下载地址 下载新的版本 之后安装 （会自动覆盖之前的版本）

服务器版本号和下载地址用XML储存 :

<update>
<version>3</version>
<name>baidu_xinwen_1.1.0</name>
<url>http://www.wangfuxin.com/UpdateSoftDemo.apk</url>
</update>

下边一个类为更新类 包括判断版本 执行下载 安装

package com.szy.update;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;

import android.app.AlertDialog;
import android.app.Dialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.DialogInterface.OnClickListener;
import android.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.Toast;

/**
*@author coolszy
*@date 2012-4-26
*@blog http://blog.92coding.com */

public class UpdateManager
{

private static final int DOWNLOAD = 1;

private static final int DOWNLOAD_FINISH = 2;

HashMap<String, String> mHashMap;

private String mSavePath;

private int progress;

private boolean cancelUpdate = false;

private Context mContext;

private ProgressBar mProgress;
private Dialog mDownloadDialog;

private Handler mHandler = new Handler()
{
public void handleMessage(Message msg)
{
switch (msg.what)
{

case DOWNLOAD:

mProgress.setProgress(progress);
break;
case DOWNLOAD_FINISH:

installApk();
break;
default:
break;
}
};
};

public UpdateManager(Context context)
{
this.mContext = context;
}

public boolean checkUpdate()
{
if (isUpdate())
{

showNoticeDialog();
return false;
} else
{
return true;
}
}
public InputStream getInputStreamFromUrl(String urlStr)//根据URL获取XML文件
throws MalformedURLException, IOException {
URL  url = new URL(urlStr);
HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
InputStream inputStream = urlConn.getInputStream();
return inputStream;
}

private boolean isUpdate()
{

int versionCode = getVersionCode(mContext);
try
{
InputStream inStream =getInputStreamFromUrl("http://www.wangfuxin.com/version.xml");//XML地址

ParseXmlService service = new ParseXmlService();

mHashMap = service.parseXml(inStream);
} catch (Exception e)
{
e.printStackTrace();
}
if (null != mHashMap)
{
int serviceCode = Integer.valueOf(mHashMap.get("version"));

if (serviceCode > versionCode)
{
return true;
}
}
return false;
}

private int getVersionCode(Context context)
{
int versionCode = 0;
try
{

versionCode = context.getPackageManager().getPackageInfo("com.szy.update", 0).versionCode;
} catch (NameNotFoundException e)
{
e.printStackTrace();
}
return versionCode;
}

private void showNoticeDialog()
{

AlertDialog.Builder builder = new Builder(mContext);
builder.setTitle(R.string.soft_update_title);
builder.setMessage(R.string.soft_update_info);

builder.setPositiveButton(R.string.soft_update_updatebtn, new OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
dialog.dismiss();

//如果用户单击更新
showDownloadDialog();
}
});

builder.setNegativeButton(R.string.soft_update_later, new OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
//如果用户选择稍后跟新（）
dialog.dismiss();
//直接退出。。。。当然你可以不这么干
System.exit(0);
}
});
Dialog noticeDialog = builder.create();
noticeDialog.show();
}

private void showDownloadDialog()
{

AlertDialog.Builder builder = new Builder(mContext);
builder.setTitle(R.string.soft_updating);

final LayoutInflater inflater = LayoutInflater.from(mContext);
View v = inflater.inflate(R.layout.softupdate_progress, null);
mProgress = (ProgressBar) v.findViewById(R.id.update_progress);
builder.setView(v);

builder.setNegativeButton(R.string.soft_update_cancel, new OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
dialog.dismiss();

cancelUpdate = true;
}
});
mDownloadDialog = builder.create();
mDownloadDialog.show();

downloadApk();
}

private void downloadApk()
{

new downloadApkThread().start();
}

private class downloadApkThread extends Thread
{
@Override
public void run()
{
try
{

if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
{

String sdpath = Environment.getExternalStorageDirectory() + "/";
mSavePath = sdpath + "download";
URL url = new URL(mHashMap.get("url"));

HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.connect();

int length = conn.getContentLength();

InputStream is = conn.getInputStream();

File file = new File(mSavePath);

if (!file.exists())
{
file.mkdir();
}
File apkFile = new File(mSavePath, mHashMap.get("name"));
FileOutputStream fos = new FileOutputStream(apkFile);
int count = 0;

byte buf[] = new byte[1024];

do
{
int numread = is.read(buf);
count += numread;

progress = (int) (((float) count / length) * 100);

mHandler.sendEmptyMessage(DOWNLOAD);
if (numread <= 0)
{

mHandler.sendEmptyMessage(DOWNLOAD_FINISH);
break;
}

fos.write(buf, 0, numread);
} while (!cancelUpdate);
fos.close();
is.close();
}
} catch (MalformedURLException e)
{
e.printStackTrace();
} catch (IOException e)
{
e.printStackTrace();
}

mDownloadDialog.dismiss();
}
};

private void installApk()
{
File apkfile = new File(mSavePath, mHashMap.get("name"));
if (!apkfile.exists())
{
return;
}

Intent i = new Intent(Intent.ACTION_VIEW);
i.setDataAndType(Uri.parse("file://" + apkfile.toString()), "application/vnd.android.package-archive");
mContext.startActivity(i);
}
}

上边的类用到了一个XML解析的类在这里

package com.szy.update;

import java.io.InputStream;
import java.util.HashMap;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class ParseXmlService
{
public HashMap<String, String> parseXml(InputStream inStream) throws Exception
{
HashMap<String, String> hashMap = new HashMap<String, String>();

// 实例化一个文档构建器工厂
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
// 通过文档构建器工厂获取一个文档构建器
DocumentBuilder builder = factory.newDocumentBuilder();
// 通过文档通过文档构建器构建一个文档实例
Document document = builder.parse(inStream);
//获取XML文件根节点
Element root = document.getDocumentElement();
//获得所有子节点
NodeList childNodes = root.getChildNodes();
for (int j = 0; j < childNodes.getLength(); j++)
{
//遍历子节点
Node childNode = (Node) childNodes.item(j);
if (childNode.getNodeType() == Node.ELEMENT_NODE)
{
Element childElement = (Element) childNode;
//版本号
if ("version".equals(childElement.getNodeName()))
{
hashMap.put("version",childElement.getFirstChild().getNodeValue());
}
//软件名称
else if (("name".equals(childElement.getNodeName())))
{
hashMap.put("name",childElement.getFirstChild().getNodeValue());
}
//下载地址
else if (("url".equals(childElement.getNodeName())))
{
hashMap.put("url",childElement.getFirstChild().getNodeValue());
}
}
}
return hashMap;
}
}

之后是调用方法

package com.szy.update;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity
{
boolean a=true;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
UpdateManager manager = new UpdateManager(MainActivity.this);
if(manager.checkUpdate())//不加这个判断的话 会同步执行下边的代码 所以加了这个 你也可以去掉试试
{                        //checkUpdate这个会自动判断是否为新版本 然后提示 是否更新 之后执行相关的操作
//如果是最新版本 则
}
else
{
//否则这里什么也不用写
}
}

}

文章借鉴了：coolszy的博文
在他的基础上添加了 远程XML的访问 跟判断

有任何问题欢迎留言