这只是初步的实现,并没有加入自动编译等功能。需要手动更改更新的xml文件和最新的apk。    
共涉及到四个文件!
一、客户端
AndroidUpdateTestActivity.cs:程序首页
main.xml:首页布局
Update.cs:更新类
softupdate_progress:更新等待界面

Updage.cs

package majier.test;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import android.app.AlertDialog;
import android.app.Dialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.DialogInterface.OnClickListener;
import android.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.Toast;

public class Update {
	private static final int DOWNLOAD = 1;
	private static final int DOWNLOAD_FINISH = 2;
	private static final int CONNECT_FAILED = 0;
	private static final int CONNECT_SUCCESS = 1;
	HashMap<String, String> mHashMap;
	private String mSavePath;
	private int progress;
	private boolean cancelUpdate = false;
	private Context mContext;
	private ProgressBar mProgress;
	private Dialog mDownloadDialog;
	private String mXmlPath; // 服务器更新xml存放地址

	public Update(Context context, String xmlPath, String savePath) {
		this.mContext = context;
		this.mXmlPath = xmlPath;
		this.mSavePath = savePath;
	}

	private Handler mHandler = new Handler() {
		public void handleMessage(Message msg) {
			switch (msg.what) {
			case DOWNLOAD:
				mProgress.setProgress(progress);
				break;
			case DOWNLOAD_FINISH:
				installApk();
				break;
			default:
				break;
			}
		};
	};

	/**
	 * 检查更新
	 */
	public void checkUpdate() {
		new Thread(new Runnable() {
			@Override
			public void run() {
				try {
					URL url = new URL(mXmlPath);
					HttpURLConnection conn = (HttpURLConnection) url
							.openConnection();
					conn.setConnectTimeout(5000);
					InputStream inStream = conn.getInputStream();
					mHashMap = parseXml(inStream);
					Message msg = new Message();
					msg.what = CONNECT_SUCCESS;
					handler.sendMessage(msg);
				} catch (Exception e) {
					Message msg = new Message();
					msg.what = CONNECT_FAILED;
					handler.sendMessage(msg);
				}
			}
		}).run();
	}

	/**
	 * 访问服务器更新XML
	 */
	Handler handler = new Handler() {
		@Override
		public void handleMessage(Message msg) {
			super.handleMessage(msg);
			switch (msg.what) {
			case CONNECT_FAILED:
				Toast.makeText(mContext, "访问服务器失败!", Toast.LENGTH_SHORT).show();
				break;
			case CONNECT_SUCCESS:
				if (null != mHashMap) {
					int serviceCode = Integer.valueOf(mHashMap.get("version"));
					if (serviceCode > getVersionCode(mContext)) {
						showNoticeDialog();
					}
				}
				break;
			}
		}
	};

	/**
	 * 获取程序版本号
	 */
	private int getVersionCode(Context context) {
		int versionCode = 0;
		try {
			versionCode = context.getPackageManager().getPackageInfo(
					mContext.getPackageName(), 0).versionCode;
		} catch (NameNotFoundException e) {
			e.printStackTrace();
		}
		return versionCode;
	}

	/**
	 * 是否更新提示窗口
	 */
	private void showNoticeDialog() {
		AlertDialog.Builder builder = new Builder(mContext);
		builder.setTitle("软件更新");
		builder.setMessage("检测到新版本,是否更新?");
		builder.setPositiveButton("更新",
				new OnClickListener() {
					@Override
					public void onClick(DialogInterface dialog, int which) {
						dialog.dismiss();
						showDownloadDialog();
					}
				});

		builder.setNegativeButton("取消",
				new OnClickListener() {
					@Override
					public void onClick(DialogInterface dialog, int which) {
						dialog.dismiss();
					}
				});
		Dialog noticeDialog = builder.create();
		noticeDialog.show();
	}

	/**
	 * 下载等待窗口
	 */
	private void showDownloadDialog() {
		AlertDialog.Builder builder = new Builder(mContext);
		builder.setTitle("正在更新");
		final LayoutInflater inflater = LayoutInflater.from(mContext);
		View v = inflater.inflate(R.layout.softupdate_progress, null);
		mProgress = (ProgressBar) v.findViewById(R.id.update_progress);
		builder.setView(v);
		builder.setNegativeButton("取消下载",
				new OnClickListener() {
					@Override
					public void onClick(DialogInterface dialog, int which) {
						dialog.dismiss();
						cancelUpdate = true;
					}
				});
		mDownloadDialog = builder.create();
		mDownloadDialog.show();
		downloadApk();
	}

	/**
	 * 涓嬭浇apk鏂囦欢
	 */
	private void downloadApk() {
		new downloadApkThread().start();
	}

	/**
	 * 下载程序
	 */
	private class downloadApkThread extends Thread {
		@Override
		public void run() {
			try {
				if (Environment.getExternalStorageState().equals(
						Environment.MEDIA_MOUNTED)) {

					URL url = new URL(mHashMap.get("url"));
					HttpURLConnection conn = (HttpURLConnection) url
							.openConnection();
					conn.connect();
					int length = conn.getContentLength();
					InputStream is = conn.getInputStream();

					File file = new File(mSavePath);
					if (!file.exists()) {
						file.mkdir();
					}
					File apkFile = new File(mSavePath, mHashMap.get("name"));
					FileOutputStream fos = new FileOutputStream(apkFile);
					int count = 0;
					byte buf[] = new byte[1024];
					do {
						int numread = is.read(buf);
						count += numread;
						progress = (int) (((float) count / length) * 100);
						mHandler.sendEmptyMessage(DOWNLOAD);
						if (numread <= 0) {
							mHandler.sendEmptyMessage(DOWNLOAD_FINISH);
							break;
						}

						fos.write(buf, 0, numread);
					} while (!cancelUpdate);
					fos.close();
					is.close();
				}
			} catch (MalformedURLException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}

			mDownloadDialog.dismiss();
		}
	};
	
	/**
	 * 安装apk
	 */
	private void installApk() {
		File apkfile = new File(mSavePath, mHashMap.get("name"));
		if (!apkfile.exists()) {
			return;
		}

		Intent i = new Intent(Intent.ACTION_VIEW);
		i.setDataAndType(Uri.parse("file://" + apkfile.toString()),
				"application/vnd.android.package-archive");
		mContext.startActivity(i);
	}

	private HashMap<String, String> parseXml(InputStream inStream)
			throws Exception {
		HashMap<String, String> hashMap = new HashMap<String, String>();
		// 实例化一个文档构建器工厂
		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
		// 通过文档构建器工厂获取一个文档构建器
		DocumentBuilder builder = factory.newDocumentBuilder();
		// 通过文档通过文档构建器构建一个文档实例
		Document document = builder.parse(inStream);
		// 获取XML文件根节点
		Element root = document.getDocumentElement();
		// 获得所有子节点
		NodeList childNodes = root.getChildNodes();
		for (int j = 0; j < childNodes.getLength(); j++) {
			// 遍历子节点
			Node childNode = (Node) childNodes.item(j);
			if (childNode.getNodeType() == Node.ELEMENT_NODE) {
				Element childElement = (Element) childNode;
				// 版本号
				if ("version".equals(childElement.getNodeName())) {
					hashMap.put("version", childElement.getFirstChild()
							.getNodeValue());
				}
				// 软件名称
				else if (("name".equals(childElement.getNodeName()))) {
					hashMap.put("name", childElement.getFirstChild()
							.getNodeValue());
				}
				// 下载地址
				else if (("url".equals(childElement.getNodeName()))) {
					hashMap.put("url", childElement.getFirstChild()
							.getNodeValue());
				}
			}
		}
		return hashMap;
	}
}



AndroidUpdateTestActivity.cs



package majier.test;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;

public class AndroidUpdateTestActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        update();
    }
    
	private void update() {
		String sdpath = Environment.getExternalStorageDirectory() + "/";
		String mSavePath = sdpath + "boiler/";
		Update updateManager = new Update(this,
				"http://localhost:8011/abcd.xml", mSavePath);
		updateManager.checkUpdate();
	}
}





main.xml


<?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" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

</LinearLayout>

softupdate_progress.xml



<?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="wrap_content">
	<ProgressBar
		android:id="@+id/update_progress"
		android:layout_width="fill_parent"
		android:layout_height="wrap_content"
		style="?android:attr/progressBarStyleHorizontal" />
</LinearLayout>



每次生成新的apk前,需要修改系统的版本号。


java如何设置程序自动执行 java程序自动更新_移动开发


修改version code 和version name。上面的代码可以看出,系统是根据version code来判断是否需要更新的。version name作为一个版本名称


这里我建议version code从10开始,这样方面名称修改(1.1、1.2)。


修改完成后,生成系统。然后将apk文件放在服务端的文件下。


二、服务端服务端主要是建立一个网址供用户下载apk。在IIS上新建网站


http://localhost:8011/。将更新文件和更新的xml放在目录下。



java如何设置程序自动执行 java程序自动更新_android_02


version.xml格式


<update>
	<version>12</version>
	<name>BoilerAndroid_1.1</name>
	<url>http://192.168.0.33:8011/boilerandroid.apk</url>
</update>



version对应着新程序的version code;


name随便起名;


url对应apk的下载路径。



在这里有可能会遇见一个问题,访问url路径时IIS报错。主要是因为IIS并不认识apk,不知道如何处理。


这里我们在IIS中新增安卓程序的MIME类型,来使apk支持下载。


在“IIS管理器”中查看所建立的网站——MIME类型——添加。


文件扩展名:.apk


MIME类型:

application/vnd.android.package-archive

java如何设置程序自动执行 java程序自动更新_java如何设置程序自动执行_03



这样就可以下载了。


目前只是一个简单的自动更新程序。我们可以看出,其中版本号需要自己填写,而且要与xml中的对应,apk需要生成后放在更新网址下。


这么的人为操作,很容易造成失误。因此,接下来我们要研究下自动发布更新版本,并且版本号与svn对应,在提交svn后,自动改变程序的版本号。