Android检测版本更新

一、准备      1.检测当前版本的信息AndroidManifest.xml-->manifest-->android:versionName。      2.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。      3.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。二、效果图                       三、必要说明      服务器端存储apk文件，同时有version.xml文件便于比对更新。

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

<info>

<version>2.0</version>

<url>http://192.168.1.187:8080/mobilesafe.apk</url>

<description>检测到最新版本，请及时更新！</description>

<url_server>http://192.168.1.99/version.xml</url_server>

</info>

      通过一个实体类获取上述信息。   

package com.android;

public class UpdataInfo {

private String version;

private String url;

private String description;

private String url_server;

	public String getUrl_server() {

		return url_server;

}

	public void setUrl_server(String url_server) {

		this.url_server = url_server;

}

	public String getVersion() {

		return version;

}

	public void setVersion(String version) {

		this.version = version;

}

	public String getUrl() {

		return url;

}

	public void setUrl(String url) {

		this.url = url;

}

	public String getDescription() {

		return description;

}

	public void setDescription(String description) {

		this.description = description;

}

}

      apk和版本信息地址都放在服务器端的version.xml里比较方便，当然如果服务器端不变动，apk地址可以放在strings.xml里，不过版本号信息是新的，必须放在服务器端，xml地址放在strings.xml。

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

<resources>

    <string name="hello">Hello World, VersionActivity!</string>

    <string name="app_name">Version</string>

    <string name="url_server">http://192.168.1.99/version.xml</string>

</resources>

      不知道读者发现没有，笔者犯了个错误，那就是url_server地址必须放在本地，否则怎么读取version.xml，所以url_server不必在实体类和version里添加，毕竟是现需要version地址也就是url_server，才能够读取version。三、代码实现

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" >

	<Button

  android:id="@+id/btn_getVersion"

  android:text="检查更新"

  android:layout_width="wrap_content"

  android:layout_height="wrap_content"/>

</LinearLayout>

package com.android;

import java.io.InputStream;

import org.xmlpull.v1.XmlPullParser;

import android.util.Xml;

public class UpdataInfoParser {

	public static UpdataInfo getUpdataInfo(InputStream is) throws Exception{

		XmlPullParser  parser = Xml.newPullParser();

		parser.setInput(is, "utf-8");

		int type = parser.getEventType();

		UpdataInfo info = new UpdataInfo();

		while(type != XmlPullParser.END_DOCUMENT ){

			switch (type) {

			case XmlPullParser.START_TAG:

				if("version".equals(parser.getName())){

					info.setVersion(parser.nextText());

}else if ("url".equals(parser.getName())){

					info.setUrl(parser.nextText());

}else if ("description".equals(parser.getName())){

					info.setDescription(parser.nextText());

}

break;

}

			type = parser.next();

}

		return info;

}

}

package com.android;

import java.io.File;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import android.app.Activity;

import android.app.AlertDialog;

import android.app.AlertDialog.Builder;

import android.app.ProgressDialog;

import android.content.DialogInterface;

import android.content.Intent;

import android.content.pm.PackageInfo;

import android.content.pm.PackageManager;

import android.net.Uri;

import android.os.Bundle;

import android.os.Environment;

import android.os.Handler;

import android.os.Message;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

import android.widget.Toast;

public class VersionActivity extends Activity {

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 UpdataInfo info;

private String localVersion;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

getVersion = (Button) findViewById(R.id.btn_getVersion);

getVersion.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

try {

localVersion = getVersionName();

CheckVersionTask cv = new CheckVersionTask();

new Thread(cv).start();

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

});

}

private String getVersionName() throws Exception {

//getPackageName()是你当前类的包名，0代表是获取版本信息

PackageManager packageManager = getPackageManager();

PackageInfo packInfo = packageManager.getPackageInfo(getPackageName(),

0);

return packInfo.versionName;

}

public class CheckVersionTask implements Runnable {

InputStream is;

public void run() {

try {

String path = getResources().getString(R.string.url_server);

URL url = new URL(path);

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();

}

info = UpdataInfoParser.getUpdataInfo(is);

if (info.getVersion().equals(localVersion)) {

Log.i(TAG, "版本号相同");

Message msg = new Message();

msg.what = UPDATA_NONEED;

handler.sendMessage(msg);

// LoginMain();

} else {

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(getApplicationContext(), "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(getApplicationContext(), "获取服务器更新信息失败", 1).show();

break;

case DOWN_ERROR:

//下载apk失败

Toast.makeText(getApplicationContext(), "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(this);

builer.setTitle("版本升级");

builer.setMessage(info.getDescription());

//当点确定按钮时从服务器上下载 新的apk 然后安装   װ

builer.setPositiveButton("确定", new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int which) {

Log.i(TAG, "下载apk,更新");

downLoadApk();

}

});

builer.setNegativeButton("取消", 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(this);

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(info.getUrl(), 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");  

  startActivity(intent);  

}  

}

package com.android;

import java.io.BufferedInputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import android.app.ProgressDialog;

import android.os.Environment;

public class DownLoadManager {

	public static File getFileFromServer(String path, ProgressDialog pd) throws Exception{

		//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 = new URL(path);

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

			conn.setConnectTimeout(5000);

			//获取到文件的大小

			pd.setMax(conn.getContentLength());

			InputStream is = conn.getInputStream();

			File file = new File(Environment.getExternalStorageDirectory(), "updata.apk");

			FileOutputStream fos = new FileOutputStream(file);

			BufferedInputStream bis = new BufferedInputStream(is);

			byte[] buffer = new byte[1024];

			int len ;

			int total=0;

			while((len =bis.read(buffer))!=-1){

				fos.write(buffer, 0, len);

				total+= len;

				//获取当前下载量

				pd.setProgress(total);

}

			fos.close();

			bis.close();

			is.close();

			return file;

}

		else{

			return null;

}

}

}

<uses-permission android:name="android.permission.INTERNET"/>

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

四、参考文献                http://blog.csdn.net/furongkang/article/details/6886526