import android.app.Activity; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; Intent intent = new Intent(); intent.setAction("android.intent.action.VIEW"); Uri content_url = Uri.parse("http://www.baidu.com"); intent.setData(content_url); startActivity(intent);打开浏览器 System.exit(0);//退出当前APP
打开指定网页 注意加
自动更新原理
APP有一个叫版本号的属性 对比远程服务器上的版本号
如果服务器上的版本号>APP版本 则根据服务器上的下载地址 下载新的版本 之后安装 (会自动覆盖之前的版本)
服务器版本号和下载地址用XML储存 :
<update> <version>3</version> <name>baidu_xinwen_1.1.0</name> <url>http://www.wangfuxin.com/UpdateSoftDemo.apk</url> </update>
下边一个类为更新类 包括判断版本 执行下载 安装
package com.szy.update; 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 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; /** *@author coolszy *@date 2012-4-26 *@blog http://blog.92coding.com */ public class UpdateManager { private static final int DOWNLOAD = 1; private static final int DOWNLOAD_FINISH = 2; HashMap<String, String> mHashMap; private String mSavePath; private int progress; private boolean cancelUpdate = false; private Context mContext; private ProgressBar mProgress; private Dialog mDownloadDialog; 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; } }; }; public UpdateManager(Context context) { this.mContext = context; } public boolean checkUpdate() { if (isUpdate()) { showNoticeDialog(); return false; } else { return true; } } public InputStream getInputStreamFromUrl(String urlStr)//根据URL获取XML文件 throws MalformedURLException, IOException { URL url = new URL(urlStr); HttpURLConnection urlConn = (HttpURLConnection) url.openConnection(); InputStream inputStream = urlConn.getInputStream(); return inputStream; } private boolean isUpdate() { int versionCode = getVersionCode(mContext); try { InputStream inStream =getInputStreamFromUrl("http://www.wangfuxin.com/version.xml");//XML地址 ParseXmlService service = new ParseXmlService(); mHashMap = service.parseXml(inStream); } catch (Exception e) { e.printStackTrace(); } if (null != mHashMap) { int serviceCode = Integer.valueOf(mHashMap.get("version")); if (serviceCode > versionCode) { return true; } } return false; } private int getVersionCode(Context context) { int versionCode = 0; try { versionCode = context.getPackageManager().getPackageInfo("com.szy.update", 0).versionCode; } catch (NameNotFoundException e) { e.printStackTrace(); } return versionCode; } private void showNoticeDialog() { AlertDialog.Builder builder = new Builder(mContext); builder.setTitle(R.string.soft_update_title); builder.setMessage(R.string.soft_update_info); builder.setPositiveButton(R.string.soft_update_updatebtn, new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); //如果用户单击更新 showDownloadDialog(); } }); builder.setNegativeButton(R.string.soft_update_later, new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { //如果用户选择稍后跟新() dialog.dismiss(); //直接退出。。。。当然你可以不这么干 System.exit(0); } }); Dialog noticeDialog = builder.create(); noticeDialog.show(); } private void showDownloadDialog() { AlertDialog.Builder builder = new Builder(mContext); builder.setTitle(R.string.soft_updating); 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(R.string.soft_update_cancel, new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); cancelUpdate = true; } }); mDownloadDialog = builder.create(); mDownloadDialog.show(); downloadApk(); } private void downloadApk() { new downloadApkThread().start(); } private class downloadApkThread extends Thread { @Override public void run() { try { if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { String sdpath = Environment.getExternalStorageDirectory() + "/"; mSavePath = sdpath + "download"; 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(); } }; 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); } }
上边的类用到了一个XML解析的类在这里
package com.szy.update; import java.io.InputStream; 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; public class ParseXmlService { public 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; } }
之后是调用方法
package com.szy.update; import android.app.Activity; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class MainActivity extends Activity { boolean a=true; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); UpdateManager manager = new UpdateManager(MainActivity.this); if(manager.checkUpdate())//不加这个判断的话 会同步执行下边的代码 所以加了这个 你也可以去掉试试 { //checkUpdate这个会自动判断是否为新版本 然后提示 是否更新 之后执行相关的操作 //如果是最新版本 则 } else { //否则这里什么也不用写 } } }
文章借鉴了:coolszy的博文 在他的基础上添加了 远程XML的访问 跟判断
有任何问题欢迎留言