Android apps应用检查更新代码

JAVA代码：
UpdateManager.java

[java]
< pre name="code" class="java">package com.iteye.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.AlertDialog.Builder;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
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;

import com.iteye.androidtoast.R;

public class UpdateManager
{
/* 下载中 */
private static final int DOWNLOAD = 1;
/* 下载结束 */
private static final int DOWNLOAD_FINISH = 2;
/* 保存解析的XML信息 */
HashMap<String, String> mHashMap;
/* 下载保存路径 */
private String mSavePath;
/* 记录进度条数量 */
private int progress;
/* 是否取消更新 */
private boolean cancelUpdate = false;

private Context mContext;
/* 更新进度条 */
private ProgressBar mProgress;
private Dialog mDownloadDialog;

private Handler mHandler = new Handler()
{
public void handleMessage(Message msg)
{
switch (msg.what)
{
// 正在下载
case DOWNLOAD:
// 设置进度条位置
mProgress.setProgress(progress);
break;
case DOWNLOAD_FINISH:
// 安装文件
installApk();
break;
default:
break;
}
};
};

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

/**
* 检测软件更新
*/
public void checkUpdate()
{
if (isUpdate())
{
// 显示提示对话框
showNoticeDialog();
} else
{
Toast.makeText(mContext, R.string.soft_update_no, Toast.LENGTH_LONG).show();
}
}

/**
* 检查软件是否有更新版本
*
* @return
*/
private boolean isUpdate()
{
// 获取当前软件版本
int versionCode = getVersionCode(mContext);
// 把version.xml放到网络上，然后获取文件信息
//InputStream inStream = ParseXmlService.class.getClassLoader().getResourceAsStream("version.xml");
// 解析XML文件。 由于XML文件比较小，因此使用DOM方式进行解析
ParseXmlService service = new ParseXmlService();
try
{
String path = "http://192.168.1.146:8080/picweb/xml/version.xml"; //地址是服务器上version.xml链接地址
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.setReadTimeout(5*1000);
conn.setRequestMethod("GET");
InputStream inStream = conn.getInputStream();
mHashMap = service.parseXml(inStream);
} catch (Exception e)
{
e.printStackTrace();
}
if (null != mHashMap)
{
int serviceCode = Integer.valueOf(mHashMap.get("version"));
// 版本判断
if (serviceCode > versionCode)
{
return true;
}
}
return false;
}

/**
* 获取软件版本号
*
* @param context
* @return
*/
private int getVersionCode(Context context)
{
int versionCode = 0;
try
{
// 获取软件版本号，对应AndroidManifest.xml下android:versionCode
versionCode = context.getPackageManager().getPackageInfo("com.iteye.androidtoast", 0).versionCode;
} catch (NameNotFoundException e)
{
e.printStackTrace();
}
return versionCode;
}

/**
* 显示软件更新对话框
*/
private void showNoticeDialog()
{
// 构造对话框
AlertDialog.Builder builder = new Builder(mContext);
builder.setTitle(R.string.soft_update_title);
builder.setMessage(R.string.soft_update_info);
// 更新
builder.setPositiveButton(R.string.soft_update_updatebtn, new OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
dialog.dismiss();
// 显示下载对话框
showDownloadDialog();
}
});
// 稍后更新
builder.setNegativeButton(R.string.soft_update_later, new OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
dialog.dismiss();
}
});
Dialog noticeDialog = builder.create();
noticeDialog.show();
}

/**
* 显示软件下载对话框
*/
private void showDownloadDialog()
{
// 构造软件下载对话框
AlertDialog.Builder builder = new Builder(mContext);
builder.setTitle(R.string.soft_updating);
// 给下载对话框增加进度条
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);
// 取消更新
builder.setNegativeButton(R.string.soft_update_cancel, new OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
dialog.dismiss();
// 设置取消状态
cancelUpdate = true;
}
});
mDownloadDialog = builder.create();
mDownloadDialog.show();
// 现在文件
downloadApk();
}

/**
* 下载apk文件
*/
private void downloadApk()
{
// 启动新线程下载软件
new downloadApkThread().start();
}

/**
* 下载文件线程
*/
private class downloadApkThread extends Thread
{
@Override
public void run()
{
try
{
// 判断SD卡是否存在，并且是否具有读写权限
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
{
// 获得存储卡的路径
String sdpath = Environment.getExternalStorageDirectory() + "/";
mSavePath = sdpath + "download";
URL url = new URL(mHashMap.get("url"));
// 创建连接
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.connect();
// 获取文件大小
int length = conn.getContentLength();
// 创建输入流
InputStream is = conn.getInputStream();

File file = new File(mSavePath);
// 判断文件目录是否存在
if (!file.exists())
{
file.mkdir();
}
File apkFile = new File(mSavePath, mHashMap.get("name"));
FileOutputStream fos = new FileOutputStream(apkFile);
int count = 0;
// 缓存
byte buf[] = new byte[1024];
// 写入到文件中
do
{
int numread = is.read(buf);
count += numread;
// 计算进度条位置
progress = (int) (((float) count / length) * 100);
// 更新进度
mHandler.sendEmptyMessage(DOWNLOAD);
if (numread <= 0)
{
// 下载完成
mHandler.sendEmptyMessage(DOWNLOAD_FINISH);
break;
}
// 写入文件
fos.write(buf, 0, numread);
} while (!cancelUpdate);// 点击取消就停止下载.
fos.close();
is.close();
}
} catch (MalformedURLException e)
{
e.printStackTrace();
} catch (IOException e)
{
e.printStackTrace();
}
// 取消下载对话框显示
mDownloadDialog.dismiss();
}
};

/**
* 安装APK文件
*/
private void installApk()
{
File apkfile = new File(mSavePath, mHashMap.get("name"));
if (!apkfile.exists())
{
return;
}
// 通过Intent安装APK文件
Intent i = new Intent(Intent.ACTION_VIEW);
i.setDataAndType(Uri.parse("file://" + apkfile.toString()), "application/vnd.android.package-archive");
mContext.startActivity(i);
}
}</pre>
< pre></pre>
< pre name="code" class="java" style="background-color: rgb(255, 255, 255); "></pre>ParseXmlService.java
< pre></pre>
< pre name="code" class="java" style="background-color: rgb(255, 255, 255); "><p></p><pre name="code" class="java" style="background-color: rgb(255, 255, 255); "><pre name="code" class="java">package com.iteye.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;
}
}</pre>
< pre></pre>
XML代码：
<p></p>
< p>version.xml</p>
< p></p>
< pre name="code" class="html" style="background-color: rgb(255, 255, 255); "><pre name="code" class="html"><?xml version="1.0" encoding="UTF-8"?>
< update>
<version>1</version>
<name>baidu_xinwen_1.1.0</name>
<url>http://gdown.baidu.com/data/wisegame/f98d235e39e29031/baiduxinwen.apk</url>
< /update></pre><pre name="code" class="html" style="background-color: rgb(255, 255, 255); "></pre>测试代码：
<p><br>
< /p>
< pre name="code" class="java" style="background-color: rgb(255, 255, 255); "><pre name="code" class="java"></pre><pre name="code" class="java">UpdateManager manager = new UpdateManager(MainTwoActivity.this);
// 检查软件更新
manager.checkUpdate();</pre>
< p><br>
< /p>
< p>注：只需要把version.xml放到网上服务器去，更新版本时，到服务器把版本号和url修改一下就可以。</p>
< p></p>
< p></p>
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