Android程式自動更新的初步實現

這隻是初步的實現，並沒有加入自動編譯等功能。需要手動更改更新的xml檔案和最新的apk。    
共涉及到四個檔案！
一、用戶端
AndroidUpdateTestActivity.cs：程式首頁
main.xml：首頁布局
Update.cs：更新類
softupdate_progress：更新等待介面

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; // 伺服器更新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;}};};/** * 檢查更新 */public void checkUpdate() {new Thread(new Runnable() {@Overridepublic 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();}/** * 訪問伺服器更新XML */Handler handler = new Handler() {@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);switch (msg.what) {case CONNECT_FAILED:Toast.makeText(mContext, "訪問伺服器失敗！", Toast.LENGTH_SHORT).show();break;case CONNECT_SUCCESS:if (null != mHashMap) {int serviceCode = Integer.valueOf(mHashMap.get("version"));if (serviceCode > getVersionCode(mContext)) {showNoticeDialog();}}break;}}};/** * 擷取程式版本號碼 */private int getVersionCode(Context context) {int versionCode = 0;try {versionCode = context.getPackageManager().getPackageInfo(mContext.getPackageName(), 0).versionCode;} catch (NameNotFoundException e) {e.printStackTrace();}return versionCode;}/** * 是否更新提示視窗 */private void showNoticeDialog() {AlertDialog.Builder builder = new Builder(mContext);builder.setTitle("軟體更新");builder.setMessage("檢測到新版本，是否更新？");builder.setPositiveButton("更新",new OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {dialog.dismiss();showDownloadDialog();}});builder.setNegativeButton("取消",new OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {dialog.dismiss();}});Dialog noticeDialog = builder.create();noticeDialog.show();}/** * 下載等待視窗 */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("取消下載",new OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {dialog.dismiss();cancelUpdate = true;}});mDownloadDialog = builder.create();mDownloadDialog.show();downloadApk();}/** * 涓嬭澆apk鏂囦歡 */private void downloadApk() {new downloadApkThread().start();}/** * 下載程式 */private class downloadApkThread extends Thread {@Overridepublic 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();}};/** * 安裝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>();// 執行個體化一個文檔構建器工廠DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();// 通過文檔構建器工廠擷取一個文檔構建器DocumentBuilder builder = factory.newDocumentBuilder();// 通過文檔通過文檔構建器構建一個文檔執行個體Document document = builder.parse(inStream);// 擷取XML檔案根節點Element root = document.getDocumentElement();// 獲得所有子節點NodeList childNodes = root.getChildNodes();for (int j = 0; j < childNodes.getLength(); j++) {// 遍曆子節點Node childNode = (Node) childNodes.item(j);if (childNode.getNodeType() == Node.ELEMENT_NODE) {Element childElement = (Element) childNode;// 版本號碼if ("version".equals(childElement.getNodeName())) {hashMap.put("version", childElement.getFirstChild().getNodeValue());}// 軟體名稱else if (("name".equals(childElement.getNodeName()))) {hashMap.put("name", childElement.getFirstChild().getNodeValue());}// 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"?><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="wrap_content"><ProgressBarandroid:id="@+id/update_progress"android:layout_width="fill_parent"android:layout_height="wrap_content"style="?android:attr/progressBarStyleHorizontal" /></LinearLayout>

每次產生新的apk前，需要修改系統的版本號碼。

修改version code 和version name。上面的代碼可以看出，系統是根據version code來判斷是否需要更新的。version name作為一個版本名稱
這裡我建議version code從10開始，這樣方面名稱修改（1.1、1.2）。
修改完成後，產生系統。然後將apk檔案放在服務端的檔案下。
二、服務端
服務端主要是建立一個網址供使用者下載apk。在IIS上建立網站

http://localhost:8011/。將更新檔案和更新的xml放在目錄下。

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對應著新程式的version code；
name隨便起名；
url對應apk的下載路徑。

在這裡有可能會遇見一個問題，訪問url路徑時IIS報錯。主要是因為IIS並不認識apk，不知道如何處理。
這裡我們在IIS中新增安卓程式的MIME類型，來使apk支援下載。
在“IIS管理器”中查看所建立的網站——MIME類型——添加。
副檔名：.apk
MIME類型：application/vnd.android.package-archive

這樣就可以下載了。
目前只是一個簡單的自動更新程式。我們可以看出，其中版本號碼需要自己填寫，而且要與xml中的對應，apk需要產生後放在更新網址下。
這麼的人為操作，很容易造成失誤。因此，接下來我們要研究下自動發布更新版本，並且版本號碼與svn對應，在提交svn後，自動改變程式的版本號碼。