Android提示版本更新+notification显示下载进度

冷不防 2022-08-08 17:30 153阅读 0赞

首先：参考了http://blog.csdn.net/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);