Android App实现应用内部自动更新的最基本方法示例

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;   } } 

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();   } } 

<?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> 

<?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> 

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