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