android 版本更新

版本更新

本文是以解析xml的为例

.从服务器获取版本号（版本号存在于xml文件中）并与当前检测到的版本进行匹配，如果不匹配，提示用户进行升级，如果匹配则进入程序主界面。

当提示用户进行版本升级时，如果用户点击了确定，系统将自动从服务器上下载并进行自动升级，如果点击取消将进入程序主界面。

首先我们需要请求网络的信息得到接口里面给我们都是什么信息

我们以这个接口为例：(http://www.oschina.net/MobileAppVersion.xml)

以下是关键的一个更新的工具类：

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileNotFoundException;
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 com.bwei.test.url.URLS;

import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.widget.Button;
import android.widget.Toast;

/**
* 更新版本的工具类
* @author
* @date
*
*/

public class UpdateVersionutil {

private final String TAG = this.getClass().getName();
private final int UPDATA_NONEED = 0;
private final int UPDATA_CLIENT = 1;
private final int GET_UNDATAINFO_ERROR = 2;
private final int SDCARD_NOMOUNTED = 3;
private final int DOWN_ERROR = 4;
private Button getVersion;
private String localVersion;
public static Context mContext;
private static UpdateVersionutil updateVersionutil;
public static boolean mNeedUpdate;

InputStream is;
private Update parse;

public UpdateVersionutil(Context mContext) {
super();
this.mContext = mContext;
}

/**
*   检测更新
*/
public void startUpdate(){
localVersion = getVersionName();
CheckVersionTask cv = new CheckVersionTask();
new Thread(cv).start();
}

public static UpdateVersionutil  getUpdataManger(Context context){
if(updateVersionutil==null){
updateVersionutil=new UpdateVersionutil(context);
}
return updateVersionutil;
}

public static void checkUpdata(){
updateVersionutil.startUpdate();
}

private String getVersionName()   {
//getPackageName()是你当前类的包名，0代表是获取版本信息
PackageManager packageManager =mContext.getPackageManager();
PackageInfo packInfo = null;
try {
packInfo = packageManager.getPackageInfo(mContext.getPackageName(),
0);
} catch (NameNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return packInfo.versionName;
}

/**
*  网络请求
*  获取到网络接口的版本号进行对比
* @author
* @date
*/

public class CheckVersionTask implements Runnable {

public void run() {
try {
//这里URLS.UPDATE_VERSION 是网络接口获取网络信息
URL url = new URL(URLS.UPDATE_VERSION);
//*****************************************************
HttpURLConnection conn = (HttpURLConnection) url
.openConnection();
conn.setConnectTimeout(5000);
conn.setRequestMethod("GET");
int responseCode = conn.getResponseCode();
if (responseCode == 200) {
// 从服务器获得一个输入流
is = conn.getInputStream();
}
//*******************************************
//调用解析的方法
parse = Update.parse(is);
Url = parse.getDownloadUrl();
//**********************************************
System.out.println("新版版本名:"+parse.getVersionName());
System.out.println("本地版本名:"+localVersion);

//对比版本号
if (parse.getVersionName().equals(localVersion)) {
mNeedUpdate=false;
Log.i(TAG, "版本号相同");
Message msg = new Message();
msg.what = UPDATA_NONEED;
handler.sendMessage(msg);
// LoginMain();
} else {
mNeedUpdate=true;
Log.i(TAG, "版本号不相同 ");
Message msg = new Message();
msg.what = UPDATA_CLIENT;
handler.sendMessage(msg);
}
} catch (Exception e) {
Message msg = new Message();
msg.what = GET_UNDATAINFO_ERROR;
handler.sendMessage(msg);
e.printStackTrace();
}
}
}

Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
super.handleMessage(msg);
switch (msg.what) {
case UPDATA_NONEED:
Toast.makeText(mContext, "不需要更新",
Toast.LENGTH_SHORT).show();
case UPDATA_CLIENT:
//对话框通知用户升级程序
showUpdataDialog();
break;
case GET_UNDATAINFO_ERROR:
//服务器超时
Toast.makeText(mContext, "获取服务器更新信息失败", 1).show();
break;
case DOWN_ERROR:
//下载apk失败
Toast.makeText(mContext, "下载新版本失败", 1).show();
break;
}
}
};
/*
*
* 弹出对话框通知用户更新程序
*
* 弹出对话框的步骤：
*  1.创建alertDialog的builder.
*  2.要给builder设置属性, 对话框的内容,样式,按钮
*  3.通过builder 创建一个对话框
*  4.对话框show()出来
*/
protected void showUpdataDialog() {
AlertDialog.Builder builer = new Builder(mContext);
builer.setTitle("版本升级");
//*********************************************
//更新提示语
builer.setMessage(parse.getUpdateLog());
//*******************************************************
//当点确定按钮时从服务器上下载 新的apk 然后安装   װ
builer.setPositiveButton("立马更新", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Log.i(TAG, "下载apk,更新");
downLoadApk();
}
});
builer.setNegativeButton("稍后再说", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
//do sth
}
});
AlertDialog dialog = builer.create();
dialog.show();
}
/*
* 从服务器中下载APK
*/
protected void downLoadApk() {
final ProgressDialog pd;    //进度条对话框
pd = new  ProgressDialog(mContext);
pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pd.setMessage("正在下载更新");
pd.show();
new Thread(){
@Override
public void run() {
try {
File file = DownLoadManager.getFileFromServer(parse.getDownloadUrl(), pd);
sleep(3000);
installApk(file);
pd.dismiss(); //结束掉进度条对话框
} catch (Exception e) {
Message msg = new Message();
msg.what = DOWN_ERROR;
handler.sendMessage(msg);
e.printStackTrace();
}
}}.start();
}

//安装apk
protected void installApk(File file) {
Intent intent = new Intent();
//执行动作
intent.setAction(Intent.ACTION_VIEW);
//执行的数据类型
intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
mContext.startActivity(intent);
}
public static String Url;
public static String getUrl(){

return Url;
}

/**
*   判断SD卡是什么状态进行下载
* @author
* @date
*/

public static class DownLoadManager {

public static File getFileFromServer(String path, ProgressDialog pd)  {
//如果相等的话表示当前的sdcard挂载在手机上并且是可用的
if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
URL url = null;
try {
url = new URL(path);
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
HttpURLConnection conn = null;
try {
conn = (HttpURLConnection) url.openConnection();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
conn.setConnectTimeout(5000);
//获取到文件的大小
pd.setMax(conn.getContentLength());
InputStream is = null;
try {
is = conn.getInputStream();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
File file = new File(Environment.getExternalStorageDirectory(), "updata.apk");
FileOutputStream fos = null;
try {
fos = new FileOutputStream(file);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
BufferedInputStream bis = new BufferedInputStream(is);
byte[] buffer = new byte[1024];
int len ;
int total=0;
try {
while((len =bis.read(buffer))!=-1){
fos.write(buffer, 0, len);
total+= len;
//获取当前下载量
pd.setProgress(total);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
fos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
bis.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
is.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return file;
}
else{
return null;
}
}
}
}

上面的代码中我们需要用到获取到信息之后进行解析，这里我用的纸xml:

/**
*      解析获取到输入流
* @param inputStream
* @return
*/
public static Update parse(InputStream inputStream){
Update update = null;
//获得XmlPullParser解析器
XmlPullParser xmlParser = Xml.newPullParser();
try {
xmlParser.setInput(inputStream, UTF8);
//获得解析到的事件类别，这里有开始文档，结束文档，开始标签，结束标签，文本等等事件。
int evtType=xmlParser.getEventType();
//一直循环，直到文档结束
while(evtType!=XmlPullParser.END_DOCUMENT){
String tag = xmlParser.getName();
switch(evtType){
case XmlPullParser.START_TAG:
//通知信息
if(tag.equalsIgnoreCase("android"))
{
update = new Update();
}
else if(update != null)
{
if(tag.equalsIgnoreCase("versionCode"))
{       //字符转换整数
update.setVersionCode(toInt(xmlParser.nextText(),0));
}
else if(tag.equalsIgnoreCase("versionName"))
{
update.setVersionName(xmlParser.nextText());
}
else if(tag.equalsIgnoreCase("downloadUrl"))
{
update.setDownloadUrl(xmlParser.nextText());
}
else if(tag.equalsIgnoreCase("updateLog"))
{
update.setUpdateLog(xmlParser.nextText());
}
}
break;
case XmlPullParser.END_TAG:
break;
}
//如果xml没有结束，则导航到下一个节点
evtType=xmlParser.next();
}
} catch (XmlPullParserException e) {
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
inputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return update;
}

/**
* 字符串转整数
* @param str
* @param defValue
* @return
*/
public static int toInt(String str, int defValue) {
try{
return Integer.parseInt(str);
}catch(Exception e){}
return defValue;
}

不要忘记了要写相应的bean类：

/**
*   应用程序更新实体类
* @author
* @date
*/
@SuppressWarnings("serial")
public class Update implements Serializable{

public final static String UTF8 = "UTF-8";
public final static String NODE_ROOT = "oschina";

private int versionCode;
private String versionName;
private String downloadUrl;
private String updateLog;

public int getVersionCode() {
return versionCode;
}
public void setVersionCode(int versionCode) {
this.versionCode = versionCode;
}
public String getVersionName() {
return versionName;
}
public void setVersionName(String versionName) {
this.versionName = versionName;
}
public String getDownloadUrl() {
return downloadUrl;
}
public void setDownloadUrl(String downloadUrl) {
this.downloadUrl = downloadUrl;
}
public String getUpdateLog() {
return updateLog;
}
public void setUpdateLog(String updateLog) {
this.updateLog = updateLog;
}

然后我们调用这个就可以了

注意上下文

UpdateVersionutil.getUpdataManger(this).startUpdate();

效果展示：





更新完成！！！