1. This time, the server uses HTTP Servlet to return json data
First, build a Java Web project and create a Servlet class. The code is implemented in doGet
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
// response.getWriter().append("Served at:
// ").append(request.getContextPath());
HttpSession session = request.getSession();
String str = request.getParameter("function");
if (str == null) {
str = "main";
}
// Judge whether the session is newly created to reduce the frequency of reading xml
if (session.isNew()) {
//System.out.println("session created successfully, session id is:" + session.getId());
} else {
//System.out.println("the server already has the session, and the session id is:" + session.getId());
String function = session.getAttribute("function").toString();
//Judge whether the functions are consistent
if (function.equals(str)) {
String data = session.getAttribute("data").toString();
response.setCharacterEncoding("utf-8");
response.getWriter().append(data);
return;
}
}
session.setAttribute("function", str.toString());
if (str != null && str.equals("Your APP alias")) {//function represents your APP, supports multiple APP version updates, and puts them in different xml
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = null;
try {
db = dbf.newDocumentBuilder();
} catch (ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String path = this.getServletContext().getRealPath("version2.xml");
File file = new File(path);
InputStream is = new FileInputStream(file);
org.w3c.dom.Document doc = null;
try {
doc = db.parse(is);
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Element elem = ((org.w3c.dom.Document) doc).getDocumentElement();
JSONObject jsonObjectRoot = new JSONObject();
NodeList appversion = elem.getChildNodes();
if (appversion != null) {
JSONObject jsonObjectUpdate = new JSONObject();
int n = 0;// Update entries
for (int i = 0; i < appversion.getLength(); i++) {
Node app = appversion.item(i);
for (Node node = app.getFirstChild(); node != null; node = node.getNextSibling()) {
if (app.getNodeName().equals("version")) {
String ver = app.getFirstChild().getNodeValue();
jsonObjectRoot.put("version", ver);
}
if (app.getNodeName().equals("date")) {
String da = app.getFirstChild().getNodeValue();
jsonObjectRoot.put("date", da);
}
if (app.getNodeName().equals("update")) {
n++;
String ud = app.getFirstChild().getNodeValue();
jsonObjectUpdate.put(n + "", ud);
}
if (app.getNodeName().equals("address")) {
String addr = app.getFirstChild().getNodeValue();
jsonObjectRoot.put("address", addr);
}
}
}
jsonObjectRoot.put("update", jsonObjectUpdate);
}
response.setCharacterEncoding("utf-8");
response.getWriter().append(jsonObjectRoot.toString());
session.setAttribute("data", jsonObjectRoot.toString());
} else {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = null;
try {
db = dbf.newDocumentBuilder();
} catch (ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String path = this.getServletContext().getRealPath("version.xml");
File file = new File(path);
InputStream is = new FileInputStream(file);
org.w3c.dom.Document doc = null;
try {
doc = db.parse(is);
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Element elem = ((org.w3c.dom.Document) doc).getDocumentElement();
JSONObject jsonObjectRoot = new JSONObject();
NodeList appversion = elem.getChildNodes();
if (appversion != null) {
JSONObject jsonObjectUpdate = new JSONObject();
int n = 0;// Update entries
for (int i = 0; i < appversion.getLength(); i++) {
Node app = appversion.item(i);
for (Node node = app.getFirstChild(); node != null; node = node.getNextSibling()) {
if (app.getNodeName().equals("version")) {
String ver = app.getFirstChild().getNodeValue();
jsonObjectRoot.put("version", ver);
}
if (app.getNodeName().equals("date")) {
String da = app.getFirstChild().getNodeValue();
jsonObjectRoot.put("date", da);
}
if (app.getNodeName().equals("update")) {
n++;
String ud = app.getFirstChild().getNodeValue();
jsonObjectUpdate.put(n + "", ud);
}
if (app.getNodeName().equals("address")) {
String addr = app.getFirstChild().getNodeValue();
jsonObjectRoot.put("address", addr);
}
}
}
jsonObjectRoot.put("update", jsonObjectUpdate);
}
response.setCharacterEncoding("utf-8");
response.getWriter().append(jsonObjectRoot.toString());
session.setAttribute("data", jsonObjectRoot.toString());
}
}You can put the APP download address in a virtual download directory of tamcat server, search tomcat to build a file download server, which is very simple to configure.<?xml version="1.0" encoding="UTF-8"?> <appupdate> <title>XX system</title> <version>1.1.0</version> <date>2018.02.04</date> <update>1:XXX optimization</update> <update>2:XXX modify</update> <update>3:XXX increase</update> <update>4:XXX Other</update> <address>http://1.1.1.1: 8888 / download / yourapp. APK < / address > <! -- download address of your updated APP -- > </appupdate>
In this way, you can access the address http://1.1.1.1:8888/YourWebName/YourServletName?function = your APP alias to get a json string, for example, my following:
{"version":"1.1.0","date":"2018.02.04","address":"http://1.1.1.1:8888/download/YourApp.apk","update":{"1":"1:XXX optimization", "2":"2:XXX modification", "3":"3:XXX increase", "4":"4:XXX others"}}}}
Now that the web server has been completed, write android
public class AppVersion extends AsyncTask<String, integer, StringBuffer> {
private Handler handle;
public String getVersion() {
return version;
}
private String version = "";
public String getUpdate() {
return update;
}
private String update = "";
private String updateURL = "";
static private String updateAPKname = "";
static public String getAPKname() {
return updateAPKname;
}
private boolean bAuto = true;
public AppVersion(Handler handle, boolean bAuto/*Automatically check for updates, manually check for updates*/) {
this.handle = handle;
this.bAuto = bAuto;
}
@Override
protected StringBuffer doInBackground(String... params) {
String html = "";
try {
//HTTP GET request
URL url = null;
url = new URL(params[0]);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(2000);
conn.setReadTimeout(1000);
InputStream inStream = conn.getInputStream();
byte[] data = readInputStream(inStream);
html = new String(data, "utf-8");
} catch (Exception e) {
e.printStackTrace();
}
return new StringBuffer(html);
}
public static byte[] readInputStream(InputStream inStream) throws Exception {
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
while ((len = inStream.read(buffer)) != -1) {
outStream.write(buffer, 0, len);
}
inStream.close();
return outStream.toByteArray();
}
@Override
protected void onPostExecute(StringBuffer result) {
String Html = new String(result);
if (!Html.equals("")) {
try {
JSONObject jsonObjectRoot = new JSONObject(Html);
version = jsonObjectRoot.getString("version");
JSONObject jsonObjectUpdate = jsonObjectRoot.getJSONObject("update");
Iterator<String> keys = jsonObjectUpdate.keys();
while (keys.hasNext()) {
String key = (String) keys.next();
update = update + jsonObjectUpdate.getString(key) + "\r\n\r\n";
}
updateURL = jsonObjectRoot.getString("address");
updateAPKname = updateURL.substring(updateURL.lastIndexOf("/") + 1);
} catch (JSONException e) {
e.printStackTrace();
}
handle.sendEmptyMessage(4);
} else {
if (!bAuto)
Toast.makeText(SearchApplication.getInstance(), "Unable to get update, please check whether the network is unblocked", Toast.LENGTH_LONG).show();
}
super.onPostExecute(result);
}
public String getUpdateURL() {
return updateURL;
}
public boolean isbAuto() {
return bAuto;
}
public void setbAuto(boolean bAuto) {
this.bAuto = bAuto;
}
}
private String path = "http://1.1.1.1:8888/YourWebName/YourServletName?function = your APP alias "; private AppVersion appVersion private MyHandler myHandler;
appVersion = new AppVersion(myHandler, true); appVersion.execute(path);
public class MyHandler extends Handler {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case 4://Query update return
try {
if (compareVersion(appVersion.getVersion(), getVersion()) > 0) {
//After obtaining the last version, if the server version > the current version, the update content will only be prompted once, and then it will be displayed in the menu once
String csTipUpdate = sp.getString(Constant.csTipUpdate, "0");//Get whether prompted
//Display update pop-up if not prompted or manually updated
if (csTipUpdate.equals("0") || !appVersion.isbAuto()) {
showUpdateDialog(true);//Show updated pop ups
sp.edit().putString(Constant.csTipUpdate, "1").apply();
}
bUpdate = true;//Menu flag bit
btnDowloadMap.setImageResource(R.mipmap.set1);
} else {
Log.d("version:", "No updated version!");
sp.edit().putString(Constant.csTipUpdate, "0").apply();
//After obtaining the last version, if it is inconsistent with the current version, the updated content will be displayed
String csVersion = sp.getString(Constant.csVersion, "");
if (csVersion.equals("") || !csVersion.equals(appVersion.getVersion())) {
showUpdateDialog(false);//show contents
}
sp.edit().putString(Constant.csVersion, appVersion.getVersion()).apply();
if (!appVersion.isbAuto())
Toast.makeText(MainActivity.this, "No updates available", Toast.LENGTH_LONG).show();
}
} catch (Exception e) {
e.printStackTrace();
}
break;
case 8://Download progress
double percent = queryDownloadStatus();
if (progressBar_download != null)
progressBar_download.setProgress((int) percent);
if (percent >= 100)
progressBar_download.setVisibility(View.INVISIBLE);
break;
}
}
}/**
* Compare the size of version number. If the former is large, it will return a positive number; if the latter is large, it will return a negative number; if it is equal, it will return 0
*
* @param version1
* @param version2
*/
public static int compareVersion(String version1, String version2) throws Exception {
if (version1 == null || version2 == null) {
throw new Exception("compareVersion error:illegal params.");
}
String[] versionArray1 = version1.split("\\.");//Note that this is a regular match and cannot be used;
String[] versionArray2 = version2.split("\\.");
int idx = 0;
int minLength = Math.min(versionArray1.length, versionArray2.length);//Take the minimum length value
int diff = 0;
while (idx < minLength
&& (diff = versionArray1[idx].length() - versionArray2[idx].length()) == 0//Compare length first
&& (diff = versionArray1[idx].compareTo(versionArray2[idx])) == 0) {//Compare characters again
++idx;
}
//If the size has been allocated, it will be returned directly. If the size has not been allocated, then the number of digits will be compared again. If there is a sub version, it will be larger;
diff = (diff != 0) ? diff : versionArray1.length - versionArray2.length;
return diff;
}/**
* Author:
* CreateTime: 2017/11/15 11:09
* Comment: Get software version number
* Param:
*/
public String getVersion() {
try {
PackageManager manager = this.getPackageManager();
PackageInfo info = manager.getPackageInfo(this.getPackageName(), 0);
String version = info.versionName;
return version;
} catch (Exception e) {
String s = e.toString();
e.printStackTrace();
return "";
}
}3, android download APK installation
private DownloadManager downloadManager;//Download management class private long lastDownloadId;
/**
* Author:
* CreateTime: 2018/1/3 15:39
* Comment: update windows
* Param:
*/
private void showUpdateDialog(boolean b) {
if (b) {
LayoutInflater inflater = LayoutInflater.from(this);
View layout = inflater.inflate(R.layout.pop_needupdate, null);//Resource file is not posted
final Dialog dialog = new Dialog(MainActivity.this, R.style.dialogstyle);
TextView tv = (TextView) layout.findViewById(R.id.tvupdate);//File controls for displaying content
final TextView tvdownload = (TextView) layout.findViewById(R.id.btn_download);//Download button
TextView tvclose = (TextView) layout.findViewById(R.id.btn_close);//Pop up close button
tvclose.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
}
});
tvdownload.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
Uri uri = Uri.parse(appVersion.getUpdateURL());//Update the APK URL obtained by the class
DownloadManager.Request request = new DownloadManager.Request(uri);
request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE | DownloadManager.Request.NETWORK_WIFI);
request.setVisibleInDownloadsUi(false);
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_HIDDEN);
File rootFile = new File(Environment.getExternalStorageDirectory().getPath() + "/YourAPP/download/");//Create a download directory
if (!rootFile.exists()) {
rootFile.mkdirs();
}
request.setDestinationInExternalPublicDir("/YourAPP/download/", getAPKname());//Set download path
lastDownloadId = downloadManager.enqueue(request);
app.setLastDownloadId(lastDownloadId);
progressBar_download.setVisibility(View.VISIBLE);//Download progress bar on pop-up window
tvdownload.setText("Downloading");
tvdownload.setClickable(false);
final Timer timer = new Timer();
TimerTask task = new TimerTask() {
@Override
public void run() {
double percent = queryDownloadStatus();
myHandler.sendEmptyMessage(8);
if (percent >= 100) {
timer.cancel();
}
}
};
timer.schedule(task, 100, 500);
}
});
progressBar_download = (CustomLoading) layout.findViewById(R.id.progressBar_download);
String update = appVersion.getUpdate();
tv.setText(update);
dialog.setCancelable(false);
dialog.setContentView(layout);
dialog.show();
Window window = dialog.getWindow();
WindowManager manager = window.getWindowManager();
Display d = manager.getDefaultDisplay();
WindowManager.LayoutParams params = window.getAttributes();
params.width = (int) (d.getWidth() * 0.4);
params.height = LinearLayout.LayoutParams.WRAP_CONTENT;
dialog.getWindow().setAttributes(params);
} else {
LayoutInflater inflater = LayoutInflater.from(this);
View layout = inflater.inflate(R.layout.pop_update, null);//After the update, the software enters the pop-up window to display the updated content for the first time
final Dialog dialog = new Dialog(MainActivity.this, R.style.dialogstyle);
TextView tv = (TextView) layout.findViewById(R.id.tvupdate);
String update = appVersion.getUpdate();
tv.setText(update);
dialog.setCancelable(true);
dialog.setContentView(layout);
dialog.show();
Window window = dialog.getWindow();
WindowManager manager = window.getWindowManager();
Display d = manager.getDefaultDisplay();
WindowManager.LayoutParams params = window.getAttributes();
params.width = (int) (d.getWidth() * 0.4);
params.height = LinearLayout.LayoutParams.WRAP_CONTENT;
dialog.getWindow().setAttributes(params);
}
}//Add code to your Application
public static YourApplication app;
private long lastDownloadId;
public static YourApplication getInstance() {
return app;
}
public long getLastDownloadId() {
return lastDownloadId;
}
public void setLastDownloadId(long lastDownloadId) {
this.lastDownloadId = lastDownloadId;
}//Query download progress
private int queryDownloadStatus() {
DownloadManager.Query query = new DownloadManager.Query();
query.setFilterById(lastDownloadId);
Cursor c = downloadManager.query(query);
if (c != null && c.moveToFirst()) {
int fileSizeIdx = c.getColumnIndex(DownloadManager.COLUMN_TOTAL_SIZE_BYTES);
int bytesDLIdx = c.getColumnIndex(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR);
int fileSize = c.getInt(fileSizeIdx);
int bytesDL = c.getInt(bytesDLIdx);
double percent = bytesDL * 100.0 / fileSize;
return (int) percent;
}
return 0;
}Add the following code to Android manifest.xml
<! -- other network permissions will not be posted if they are not displayed in the notice bar when downloading updates -- >
<uses-permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION" />
</application>
<receiver android:name=".BroadcastReceiver.CompleteReceiver">
<intent-filter>
<action android:name="android.intent.action.DOWNLOAD_COMPLETE" />
</intent-filter>
</receiver>
</application>public class CompleteReceiver extends BroadcastReceiver {
private DownloadManager downloadManager;
private long downloadId;
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(DownloadManager.ACTION_DOWNLOAD_COMPLETE)) {
downloadId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
installApk(context, downloadId);
}
}
private void installApk(Context context, long downloadId) {
DownloadManager downloadManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
if (app.getLastDownloadId() == downloadId) {
Uri downloadFileUri = downloadManager.getUriForDownloadedFile(downloadId);
if (getAPKname() != null && !getAPKname().equals("")) {
try {
if (downloadFileUri != null) {
Intent install = new Intent(Intent.ACTION_VIEW);
install.setDataAndType(downloadFileUri, "application/vnd.android.package-archive");
install.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(install);
}
} catch (Exception e) {
Toast.makeText(context, "install APP Problems arise", Toast.LENGTH_LONG).show();
}
} else {
Toast.makeText(context, "install APP Problems arise", Toast.LENGTH_LONG).show();
}
}
}
}