PackageInfo packageInfo = context.getPackageManager().getPackageInfo(context.getPackageName(), 0);
int localVersion = packageInfo.versionCode;

 /*** 下载apk* * @param apkUri*/private void downLoadNewApk(String apkUri, String version) {manager = (NotificationManager) context.getSystemService((context.NOTIFICATION_SERVICE));notify = new Notification();notify.icon = R.drawable.ic_launcher;// 通知栏显示所用到的布局文件notify.contentView = new RemoteViews(context.getPackageName(),R.layout.view_notify_item);manager.notify(100, notify);//建立下载的apk文件File fileInstall = FileOperate.mkdirSdcardFile("downLoad", APK_NAME+ version + ".apk");downLoadSchedule(apkUri, completeHandler, context,fileInstall);}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_marginLeft="10dp"android:background="#00000000"android:padding="5dp" ><ImageViewandroid:id="@+id/notify_icon_iv"android:layout_width="25dp"android:layout_height="25dp"android:src="@drawable/ic_launcher" /><TextViewandroid:id="@+id/notify_updata_values_tv"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerHorizontal="true"android:layout_marginBottom="6dp"android:layout_marginLeft="15dp"android:layout_marginTop="5dp"android:layout_toRightOf="@id/notify_icon_iv"android:gravity="center_vertical"android:text="0%"android:textColor="@color/white"android:textSize="12sp" /><ProgressBarandroid:id="@+id/notify_updata_progress"style="@android:style/Widget.ProgressBar.Horizontal"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_below="@id/notify_icon_iv"android:layout_marginTop="4dp"android:max="100" />
</RelativeLayout>

   /*** 连接网络,下载一个文件,并传回进度* * @param uri* @param handler* @param context* @param file*/public static void downLoadSchedule(final String uri,final Handler handler, Context context, final File file) {if (!file.exists()) {handler.sendEmptyMessage(-1);return;}// 每次读取文件的长度final int perLength = 4096;new Thread() {@Overridepublic void run() {super.run();try {URL url = new URL(uri);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setDoInput(true);conn.connect();InputStream in = conn.getInputStream();// 2865412long length = conn.getContentLength();// 每次读取1kbyte[] buffer = new byte[perLength];int len = -1;FileOutputStream out = new FileOutputStream(file);int temp = 0;while ((len = in.read(buffer)) != -1) {// 写入文件out.write(buffer, 0, len);// 当前进度int schedule = (int) ((file.length() * 100) / length);// 通知更新进度（10,7,4整除才通知，没必要每次都更新进度）if (temp != schedule&& (schedule % 10 == 0 || schedule % 4 == 0 || schedule % 7 == 0)) {// 保证同一个数据只发了一次temp = schedule;handler.sendEmptyMessage(schedule);}}out.flush();out.close();in.close();} catch (IOException e) {e.printStackTrace();}}}.start();}

/*** 更新通知栏*/ private Handler completeHandler = new Handler() {public void handleMessage(android.os.Message msg) {// 更新通知栏if (msg.what < 100) {notify.contentView.setTextViewText(R.id.notify_updata_values_tv, msg.what + "%");notify.contentView.setProgressBar(R.id.notify_updata_progress,100, msg.what, false);manager.notify(100, notify);} else {notify.contentView.setTextViewText(R.id.notify_updata_values_tv, "下载完成");notify.contentView.setProgressBar(R.id.notify_updata_progress,100, msg.what, false);// 清除通知栏manager.cancel(100);installApk(fileInstall);}};};

/*** 安装apk* * @param file*/private void installApk(File file) {Intent intent = new Intent();intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);intent.setAction(android.content.Intent.ACTION_VIEW);intent.setDataAndType(Uri.fromFile(file),"application/vnd.android.package-archive");context.startActivity(intent);}