Android程序的版本检测与更新怎么去实现

Version=1.0

1.0

//==========================================================================
// 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 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 {
@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();
}
}
}