android 版本检测 Android程序的版本检测与更新实现介绍

Version=1.0 

<?xml version="1.0" encoding="utf-8" ?> 
<string>1.0</string> 

//========================================================================== 
// 菜单 
//========================================================================== 
private static final String urlApk = "http://3g.***.com/tool/***.apk"; 
private static final String urlVer = "http://3g.***.com/tool/ver_apk.xml"; 
@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
menu.add(Menu.NONE, Menu.FIRST + 1, 5, "检测更新").setIcon( 
android.R.drawable.ic_menu_upload); 
menu.add(Menu.NONE,Menu.FIRST+2,4,"退出").setIcon(android.R.drawable.ic_lock_power_off); 
return true; 
} 
@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
switch (item.getItemId()) { 
case Menu.FIRST + 1: 
Toast.makeText(this, "正在检测版本", Toast.LENGTH_LONG).show(); 
UpdateVer uv = new UpdateVer(urlApk,urlVer,MainActivity.this); 
uv.checkVer(); 
break; 
case Menu.FIRST + 2: 
confirmExit(); 
break; 
} 
return false; 
} 

package android.***; 
import android.app.Activity; 
import android.app.AlertDialog; 
import android.app.Dialog; 
import android.app.ProgressDialog; 
import android.content.Context; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.net.Uri; 
import android.os.AsyncTask; 
import android.util.Log; 
import android.webkit.URLUtil; 
import android.widget.Toast; 
import java.io.File; 
import java.io.FileNotFoundException; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.net.MalformedURLException; 
import java.net.URL; 
import java.net.URLConnection; 
import java.util.Properties; 
import org.xml.sax.InputSource; 
import java.text.SimpleDateFormat; 
import java.util.Date; 
public class UpdateVer extends Activity{ 
private static final String TAG = "DOWNLOADAPK"; 
private String PastVersion; 
private String NowVersion; 
public ProgressDialog pBar; 
private String currentFilePath = ""; 
private String fileEx=""; 
private String fileNa=""; 
private String strURL=""; 
private String VersionUri =""; 
private Context mContext; 
private final String fileVer = "ver.cfg"; 
public UpdateVer(String urlapk,String urlver,final Context context){ 
SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss"); 
String ver = "?ver=" + df.format(new Date());//主要是避开手机的缓存 
strURL = urlapk + ver; 
VersionUri = urlver + ver; 
mContext = context; 
} 
public void checkVer() { 
// 解析Version网页，获取版本号 
getVersionxml(VersionUri); 
} 
private void compareVer() { 
load(); 

//当有最新版本的时候 
if(PastVersion != null && !PastVersion.equals(NowVersion)){ 
Dialog dialog = new AlertDialog.Builder(mContext).setTitle("系统更新") 
.setMessage(String.format("发现新版本%s，目前版本为%s，请更新！",NowVersion,PastVersion))// 设置内容 
// 设置确定按钮 
.setPositiveButton("确定" 
,new DialogInterface.OnClickListener() { 
@Override 
public void onClick(DialogInterface dialog, 
int which) { 
pBar = new ProgressDialog(mContext); 
pBar.setTitle("正在下载"); 
pBar.setMessage("请稍候..."); 
pBar.setProgressStyle(ProgressDialog.STYLE_SPINNER); 
fileEx = strURL.substring(strURL.lastIndexOf(".") + 1,strURL.length()).toLowerCase(); 
fileEx = fileEx.substring(0,fileEx.lastIndexOf("?")); 
fileNa = strURL.substring(strURL.lastIndexOf("/") + 1,strURL.lastIndexOf(".")); 
getFile(strURL); 
} 
}).setNegativeButton("取消", 
new DialogInterface.OnClickListener() { 
@Override 
public void onClick(DialogInterface dialog, 
int whichButton) { 
// 点击"取消"按钮之后退出程序 
} 
}).create();// 创建 
// 显示对话框 
dialog.show(); 
} 
else{ 
Toast.makeText(mContext, String.format("当前为最新版本%s",PastVersion), Toast.LENGTH_LONG).show(); 
} 
} 
private void getFile(final String strPath) 
{ 
pBar.show(); 
try{ 
if (strPath.equals(currentFilePath) ){ 
getDataSource(strPath); 
} 
currentFilePath = strPath; 
Runnable r = new Runnable(){ 
@Override 
public void run() 
{ 
try{ 
getDataSource(strPath); 
} 
catch (Exception e){ 
Log.e(TAG, e.getMessage(), e); 
} 
} 
}; 
new Thread(r).start(); 
} 
catch(Exception e){ 
e.printStackTrace(); 
} 
} 
/*取得远程文件*/ 
private void getDataSource(String strPath) throws Exception { 
if (!URLUtil.isNetworkUrl(strPath)) { 
Log.d("Tag","error"); 
} 
else { 
/*取得URL*/ 
URL myURL = new URL(strPath); 
/*建立联机*/ 
URLConnection conn = myURL.openConnection(); 
conn.connect(); 
/*InputStream 下载文件*/ 
InputStream is = conn.getInputStream(); 
if (is == null) { 
Log.d("tag","error"); 
throw new RuntimeException("没有读取到文件内容"); 
} 
/*建立临时文件*/ 
File myTempFile = File.createTempFile(fileNa, "." + fileEx); 
myTempFile.getAbsolutePath(); 
/*将文件写入临时盘*/ 
FileOutputStream fos = new FileOutputStream(myTempFile); 
byte buf[] = new byte[128]; 
do{ 
int numread = is.read(buf); 
if (numread <= 0) { 
break; 
} 
fos.write(buf, 0, numread); 
}while (true); 

/*打开文件进行安装*/ 
openFile(myTempFile); 
try { 
is.close(); 
} 
catch (Exception ex){ 
Log.d("Tag","error"); 
Log.e(TAG, "error: " + ex.getMessage(), ex); 
} 
} 
} 
/* 在手机上打开文件 */ 
private void openFile(File f) { 
pBar.cancel(); 
Intent intent = new Intent(); 
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
intent.setAction(android.content.Intent.ACTION_VIEW); 
/* 调用getMIMEType()来取得MimeType */ 
String type = getMIMEType(f); 
/* 设定intent的file与MimeType */ 
intent.setDataAndType(Uri.fromFile(f),type); 
mContext.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(); 

/* 按扩展名的类型决定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，就跳出软件清单给使用者选择 */ 
if(!end.equals("apk")){ 
type += "/*"; 
} 
return type; 
} 
private void getVersionxml(String resourceUrl){ 
GetVer gv = new GetVer(); 
gv.execute(resourceUrl); 
} 
private boolean load(){ 
Properties properties = new Properties(); 
try{ 
InputStream stream = mContext.getAssets().open(fileVer); 
//FileInputStream stream = mContext.openFileInput(fileVer); 
//读取文件内容 
properties.load(stream); 
} 
catch (FileNotFoundException e){ 
return false; 
} 
catch(IOException e){ 
return false; 
} 
catch(Exception e){ 
return false; 
} 
PastVersion = String.valueOf(properties.get("Version").toString()); 
return true; 
} 

//========================================================================== 
// GetVer 
//========================================================================== 
class GetVer extends AsyncTask<String, Integer, String> { 
@Override 
protected String doInBackground(String... urlVer) { 
String db = null; 
URL url = null; 

try { 
url = new URL(urlVer[0]); 
} 
catch (MalformedURLException e) { 
e.printStackTrace(); 
} 
InputSource is = null; 
try { 
is = new InputSource(url.openStream()); 
is.setEncoding("UTF-8"); 
db = SAXGetVersionService.readRssXml(is); 
} 
catch (Exception e) { 
e.printStackTrace(); 
} 
return db; 
} 
@Override 
protected void onCancelled() { 
super.onCancelled(); 
} 
@Override 
protected void onPostExecute(String result) { 
NowVersion = result; 
compareVer(); 
} 
} 
} 

<uses-permission android:name="android.permission.INTERNET" /> 
<uses-permission android:name="android.permission.INSTALL_PACKAGES"/> 
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/> 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 
<uses-permission android:name="android.permission.RESTART_PACKAGES" /> 
<uses-permission android:name="android.permission.READ_PHONE_STATE" /> 
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> 
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />