一个版本更新类：
import java.io.File;import android.app.DownloadManager;import android.app.DownloadManager.Request;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.content.SharedPreferences;import android.content.pm.PackageInfo;import android.content.pm.PackageManager.NameNotFoundException;import android.database.Cursor;import android.net.Uri;import android.os.Environment;import android.preference.PreferenceManager;import android.view.View;import android.webkit.MimeTypeMap;/** * app版本更新类 需要以下权限 <br> * <uses-permission * android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION" /><br> * <uses-permission android:name="android.permission.INTERNET" /><br> * <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><br> * * @author Administrator * */public class VersionManager {private Context context;private AppVersion appVersion;private DownloadManager downloadManager;private SharedPreferences prefs;private static final String DL_ID = "update_app_id";// 文件在sd卡的真实目录private String apkAbsolutePath;public void setOnUpdateListener(OnUpdateListener listener) {this.listener = listener;}private OnUpdateListener listener;public void setAppVersion(AppVersion appVersion) {this.appVersion = appVersion;}private static VersionManager instance = null;public static VersionManager getInstance(Context context,AppVersion appVersion) {if (instance == null) {instance = new VersionManager(context, appVersion);}return instance;}private VersionManager(Context context, AppVersion appVersion) {this.appVersion = appVersion;this.context = context;apkAbsolutePath = getSDPath() + appVersion.getFilePath() + "/"+ appVersion.getFileName();downloadManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);prefs = PreferenceManager.getDefaultSharedPreferences(context);}public void checkUpdateInfo() {String localVersion = getVersionCode(context) + "";// 这里只要两个版本不一致就更新，不考虑版本降级的情况…if (!localVersion.equals(appVersion.getVersionCode())) {listener.hasNewVersion(true);} else {listener.hasNewVersion(false);}}/** * 获取版本号(内部识别号) * * @param context * @return */private int getVersionCode(Context context) {try {PackageInfo pi = context.getPackageManager().getPackageInfo(context.getPackageName(), 0);return pi.versionCode;} catch (NameNotFoundException e) {e.printStackTrace();return -1;}}/** * 下载文件 */public void downLoad() {if (!isSdCardExist()) {listener.onError("文件无法下载请检测您的sd卡");return;}if (isFileExist(apkAbsolutePath)) {// 如果文件已经存在则安装appinstallApk();return;}// 开始下载Uri resource = Uri.parse(appVersion.getApkUrl());DownloadManager.Request request = new DownloadManager.Request(resource);request.setAllowedNetworkTypes(Request.NETWORK_MOBILE| Request.NETWORK_WIFI);request.setAllowedOverRoaming(false);// 设置文件类型MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();String mimeString = mimeTypeMap.getMimeTypeFromExtension(MimeTypeMap.getFileExtensionFromUrl(appVersion.getApkUrl()));request.setMimeType(mimeString);// 在通知栏中显示request.setNotificationVisibility(View.VISIBLE);request.setVisibleInDownloadsUi(true);request.setDestinationInExternalPublicDir("/" + appVersion.getFilePath() + "/", appVersion.getFileName());request.setTitle("版本更新…");long id = downloadManager.enqueue(request);// 保存idprefs.edit().putLong(DL_ID, id).commit();// 注册广播监听下载context.registerReceiver(receiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));}private void installApk() {Intent intent = new Intent(Intent.ACTION_VIEW);intent.setDataAndType(Uri.fromFile(new File(apkAbsolutePath)),"application/vnd.android.package-archive");context.startActivity(intent);}private boolean isSdCardExist() {return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);}private String getSDPath() {if (isSdCardExist()) {return Environment.getExternalStorageDirectory() + "/";}return null;}private boolean isFileExist(String path) {return new File(path).exists();}private BroadcastReceiver receiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {DownloadManager.Query query = new DownloadManager.Query();query.setFilterById(prefs.getLong(DL_ID, 0));Cursor c = downloadManager.query(query);if (c.moveToFirst()) {int status = c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS));switch (status) {case DownloadManager.STATUS_RUNNING:// 正在下载，，不做任何事情listener.onDownloading();break;case DownloadManager.STATUS_SUCCESSFUL:// 下载完成首先取消注册广播，然后安装applistener.onSuccess();context.unregisterReceiver(receiver);installApk();break;case DownloadManager.STATUS_FAILED:// 下载失败 清除已下载的内容，重新下载context.unregisterReceiver(receiver);listener.onError("下载失败，请重试");downloadManager.remove(prefs.getLong(DL_ID, 0));prefs.edit().clear().commit();break;}}}};/** * app版本信息 * * @author sunger * */public static class AppVersion {// apk下载urlprivate String apkUrl;// apk最新版本private String versionCode;public String getVersionCode() {return versionCode;}public void setVersionCode(String versionCode) {this.versionCode = versionCode;}public String getFileName() {return fileName;}public void setFileName(String fileName) {this.fileName = fileName;}private String fileName;public String getFilePath() {return filePath;}public void setFilePath(String filePath) {this.filePath = filePath;}/** * 文件在sd卡的相对路径 */private String filePath;public String getApkUrl() {return apkUrl;}public void setApkUrl(String apkUrl) {this.apkUrl = apkUrl;}}public interface OnUpdateListener {/** * 是否有新版本更新，如果为true这里开始调用 ** @param has */public void hasNewVersion(boolean has);/** * 正在开始下载 */public void onDownloading();/** * 下载完成，并且安装成功 */public void onSuccess();/** * 更新失败 ** @param msg *失败的消息 */public void onError(String msg);}}
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