Android App实现应用内部自动更新的最基本方法示例
共涉及到四个文件!
一、客户端
AndroidUpdateTestActivity:程序首页
main.xml:
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:程序首页
main.xml:首页布局
Update:更新类
softupdate_progress:更新等待界面
Updage
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
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。
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。
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
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。