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