Android提示版本更新+notification显示下载进度

首先：参考了http://blog.youkuaiyun.com/harvic880925/article/details/25191159这篇文章。然后自己做了一遍，更改下载进度条

服务器端：放置了一个version.xml文件来保存版本号和版本名称等

客户端：点击查看版本信息时，去服务器端取version.xml这个文件，然后使用XmlPullParser解析，判断本地与服务器端的版本是否需要更新。如果需要更新，提供apk下载地址，然后下载就好。

一、从服务器端获取version.xml文件，解析

1、给定地址获取，转换成String类型的格式

public static String getInputStreamFromServer(String urlSpec) {
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		try {
			URL url = new URL(urlSpec);
			HttpURLConnection connection = (HttpURLConnection) url
					.openConnection();

			try {

				if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) {
					return null;
				}

				InputStream is = connection.getInputStream();
				BufferedInputStream bis = new BufferedInputStream(is);

				byte[] buffer = new byte[1024];
				int len = -1;
				while ((len = bis.read(buffer)) != -1) {
					out.write(buffer, 0, len);
				}

				out.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			connection.disconnect();

		} catch (Exception e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}

		return new String(out.toByteArray());
	}

2、将以上文件使用XmlPullParser解析，其中UpdateInfo是本地用于存储xml转换后的数据结构

public static UpdateInfo getUpdateInfo(String urlString) throws Exception {
		XmlPullParser parser = Xml.newPullParser();
		parser.setInput(new StringReader(urlString));
		int eventType = parser.getEventType();
		UpdateInfo info = new UpdateInfo();

		while (eventType != XmlPullParser.END_DOCUMENT) {
			if (eventType == XmlPullParser.START_TAG) {
				if ("verCode".equals(parser.getName())) {
					info.setVerCode(Integer.parseInt(parser.nextText()));
				} else if ("verName".equals(parser.getName())) {
					info.setVerName(parser.nextText());
				} else if ("description".equals(parser.getName())) {
					info.setDescription(parser.nextText());
				} else if ("apkUrl".equals(parser.getName())) {
					info.setApkUrl(parser.nextText());
				}
			}
			eventType = parser.next();
		}

		return info;
	}

二、比较本地版本和version.xml中获取的版本，确定是否需要更新

注：里边涉及到的网络请求需要异步

UpdateInfo info = UpdateInfoParser.getUpdateInfo(Common
						.getInputStreamFromServer(Common.SERVER_IP_VERSIONXML));

				m_verName = info.getVerName();
				m_verCode = info.getVerCode();
				if (info.getVerCode() > vercode) {
					return true;
				} else {
					return false;
				}

三、下载apk+更新进度条

1、下载文件

void downFile(final String downloadUrl) {
		new Thread() {
			@Override
			public void run() {
				try {
					URL url = new URL(downloadUrl);
					HttpURLConnection connection = (HttpURLConnection) url
							.openConnection();

					try {

						if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) {
							return;
						}

						long length = connection.getContentLength();

						InputStream is = connection.getInputStream();

						BufferedInputStream bis = new BufferedInputStream(is);

						File file = new File(Environment
								.getExternalStorageDirectory()
								.getAbsoluteFile()
								+ File.separator + "test.apk");
						BufferedOutputStream bos = new BufferedOutputStream(
								new FileOutputStream(file));

						byte[] buffer = new byte[1024];
						int len = -1;
						int count = 0; // 记录进度
						while ((len = bis.read(buffer)) != -1) {
							bos.write(buffer, 0, len);
							count += len;

							progress = (int) (((double) count / length) * 100);
							if (length > 0 && progress % 5 == 0) {
								Message msg = progressHandler.obtainMessage(
										MESSAGE_UPDATEPROGRESS, progress);
								msg.arg1 = progress;
								msg.sendToTarget();
							}
						}
						bos.flush();
						bos.close();
						down(); // 告诉HANDER已经下载完成了，可以安装了
					} catch (IOException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
					connection.disconnect();

				} catch (Exception e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}

			};
		}.start();
	}

2、更新进度条（注意：每次更新进度条RemoteViews需要新new）

Handler progressHandler = new Handler() {
		public void handleMessage(Message msg) {
			if (msg.what == MESSAGE_UPDATEPROGRESS) {
				romoteView = new RemoteViews(getPackageName(),
						R.layout.noti_progressbar);// 每次更新notification，必须重新new
													// RomoteViews
				romoteView.setProgressBar(R.id.pb_notification, 100, msg.arg1,
						false);
				romoteView.setTextViewText(R.id.tv_notification, "已下载"
						+ msg.arg1 + "%");
				notification.contentView = romoteView;
				nm.notify(0, notification);
			}
			super.handleMessage(msg);
		};
	};

四、下载完成以后就需要安装

Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File(Environment.getExternalStorageDirectory()
		.getAbsoluteFile() + File.separator + "test.apk")),
		"application/vnd.android.package-archive");
startActivity(intent);