If you have apps that are hosted on your server and as time passes you make enhancements, fix bugs, etc. then comes the question how can I alert all my app users that a newer version is out there and make it real easy for them to download. You can email all your users with the link to the new version, that will be very cumbersome. Well that process needs to be built right into the app you deploy it for the first time.
Here is an example how to do it, the basic idea is outlined below
- Create a Web Service which your app can poll whenever the app launches or based on some time limit that can check if there is new version out there.
- This Web service should return the lastest Version of the apk file that is hosted on the Server along with the URI of the application file that has the new version.
- When your app gets the response from the Web Service, it will parse the JSON and check your app version to the lastest version that is available on the server.
- If your app version is lower than the latest version it will prompt the user to start the download process.
- The download of the new app is handled by the Download Manager.
- The download manager will notify your app using Broadcast receiver when the download is complete.
- Upon completion of the latest version of the application file the you can start the activity to install that file.
- At this point user needs to say OKAY, lets do it.
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Java Servlet Web Service to check New Version - CheckAppVersion.java
package com.as400samplecode;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.google.gson.JsonObject;
public class CheckAppVersion extends HttpServlet {
private static final long serialVersionUID = 1L;
public CheckAppVersion() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request,response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
response.setContentType("text/html");
//send a JSON response with the app Version and file URI
JsonObject myObj = new JsonObject();
myObj.addProperty("success", true);
myObj.addProperty("latestVersion", 2);
myObj.addProperty("appURI", "http://demo.mysamplecode.com/Servlets_JSP/apps/MyAndroidApp.apk");
out.println(myObj.toString());
out.close();
}
}
Application Manifest file - AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.as400samplecode"
android:versionCode="1"
android:versionName="2.1.3" >
<uses-sdk
android:minSdkVersion="16"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.as400samplecode.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Application Layout file - activity_main.xml
<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" tools:context=".MainActivity"
android:padding="5dp">
<TextView android:id="@+id/versionName" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" android:layout_marginTop="16dp"
android:text="What Version?" android:textAppearance="?android:attr/textAppearanceMedium"
android:textStyle="bold" />
<TextView android:id="@+id/textView1" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_below="@+id/versionName"
android:layout_marginTop="16dp" android:text="@string/copyright"
android:textAppearance="?android:attr/textAppearanceMedium" />
</RelativeLayout>
IntentService for making Web Service requests - MyWebService.java
package com.as400samplecode;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.params.ConnManagerParams;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import com.as400samplecode.MainActivity.MyWebReceiver;
import android.app.IntentService;
import android.content.Intent;
import android.util.Log;
public class MyWebService extends IntentService{
private static final String LOG_TAG = "MyWebService";
public static final String REQUEST_STRING = "myRequest";
public static final String RESPONSE_STRING = "myResponse";
public static final String RESPONSE_MESSAGE = "myResponseMessage";
private String URL = null;
private static final int REGISTRATION_TIMEOUT = 3 * 1000;
private static final int WAIT_TIMEOUT = 30 * 1000;
public MyWebService() {
super("MyWebService");
}
@Override
protected void onHandleIntent(Intent intent) {
String requestString = intent.getStringExtra(REQUEST_STRING);
Log.v(LOG_TAG, requestString);
String responseMessage = "";
try {
URL = requestString;
HttpClient httpclient = new DefaultHttpClient();
HttpParams params = httpclient.getParams();
HttpConnectionParams.setConnectionTimeout(params, REGISTRATION_TIMEOUT);
HttpConnectionParams.setSoTimeout(params, WAIT_TIMEOUT);
ConnManagerParams.setTimeout(params, WAIT_TIMEOUT);
HttpGet httpGet = new HttpGet(URL);
HttpResponse response = httpclient.execute(httpGet);
StatusLine statusLine = response.getStatusLine();
if(statusLine.getStatusCode() == HttpStatus.SC_OK){
ByteArrayOutputStream out = new ByteArrayOutputStream();
response.getEntity().writeTo(out);
out.close();
responseMessage = out.toString();
}
else{
Log.w("HTTP1:",statusLine.getReasonPhrase());
response.getEntity().getContent().close();
throw new IOException(statusLine.getReasonPhrase());
}
} catch (ClientProtocolException e) {
Log.w("HTTP2:",e );
responseMessage = e.getMessage();
} catch (IOException e) {
Log.w("HTTP3:",e );
responseMessage = e.getMessage();
}catch (Exception e) {
Log.w("HTTP4:",e );
responseMessage = e.getMessage();
}
Intent broadcastIntent = new Intent();
broadcastIntent.setAction(MyWebReceiver.PROCESS_RESPONSE);
broadcastIntent.addCategory(Intent.CATEGORY_DEFAULT);
broadcastIntent.putExtra(RESPONSE_MESSAGE, responseMessage);
sendBroadcast(broadcastIntent);
}
}
Application Activity - MainActivity.java
package com.as400samplecode;
import org.json.JSONException;
import org.json.JSONObject;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.DownloadManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager.NameNotFoundException;
import android.util.Log;
import android.view.Menu;
import android.widget.TextView;
public class MainActivity extends Activity {
private static final String LOG_TAG = "AppUpgrade";
private MyWebReceiver receiver;
private int versionCode = 0;
String appURI = "";
private DownloadManager downloadManager;
private long downloadReference;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Overall information about the contents of a package
//This corresponds to all of the information collected from AndroidManifest.xml.
PackageInfo pInfo = null;
try {
pInfo = getPackageManager().getPackageInfo(getPackageName(), 0);
}
catch (NameNotFoundException e) {
e.printStackTrace();
}
//get the app version Name for display
String version = pInfo.versionName;
//get the app version Code for checking
versionCode = pInfo.versionCode;
//display the current version in a TextView
TextView versionText = (TextView) findViewById(R.id.versionName);
versionText.setText(version);
//Broadcast receiver for our Web Request
IntentFilter filter = new IntentFilter(MyWebReceiver.PROCESS_RESPONSE);
filter.addCategory(Intent.CATEGORY_DEFAULT);
receiver = new MyWebReceiver();
registerReceiver(receiver, filter);
//Broadcast receiver for the download manager
filter = new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE);
registerReceiver(downloadReceiver, filter);
//check of internet is available before making a web service request
if(isNetworkAvailable(this)){
Intent msgIntent = new Intent(this, MyWebService.class);
msgIntent.putExtra(MyWebService.REQUEST_STRING, "http://demo.mysamplecode.com/Servlets_JSP/CheckAppVersion");
startService(msgIntent);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
@Override
public void onDestroy() {
//unregister your receivers
this.unregisterReceiver(receiver);
this.unregisterReceiver(downloadReceiver);
super.onDestroy();
}
//check for internet connection
private boolean isNetworkAvailable(Context context) {
ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity != null) {
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null) {
for (int i = 0; i < info.length; i++) {
Log.v(LOG_TAG,String.valueOf(i));
if (info[i].getState() == NetworkInfo.State.CONNECTED) {
Log.v(LOG_TAG, "connected!");
return true;
}
}
}
}
return false;
}
//broadcast receiver to get notification when the web request finishes
public class MyWebReceiver extends BroadcastReceiver{
public static final String PROCESS_RESPONSE = "com.as400samplecode.intent.action.PROCESS_RESPONSE";
@Override
public void onReceive(Context context, Intent intent) {
String reponseMessage = intent.getStringExtra(MyWebService.RESPONSE_MESSAGE);
Log.v(LOG_TAG, reponseMessage);
//parse the JSON response
JSONObject responseObj;
try {
responseObj = new JSONObject(reponseMessage);
boolean success = responseObj.getBoolean("success");
//if the reponse was successful check further
if(success){
//get the latest version from the JSON string
int latestVersion = responseObj.getInt("latestVersion");
//get the lastest application URI from the JSON string
appURI = responseObj.getString("appURI");
//check if we need to upgrade?
if(latestVersion > versionCode){
//oh yeah we do need an upgrade, let the user know send an alert message
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setMessage("There is newer version of this application available, click OK to upgrade now?")
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
//if the user agrees to upgrade
public void onClick(DialogInterface dialog, int id) {
//start downloading the file using the download manager
downloadManager = (DownloadManager)getSystemService(DOWNLOAD_SERVICE);
Uri Download_Uri = Uri.parse(appURI);
DownloadManager.Request request = new DownloadManager.Request(Download_Uri);
request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI);
request.setAllowedOverRoaming(false);
request.setTitle("My Andorid App Download");
request.setDestinationInExternalFilesDir(MainActivity.this,Environment.DIRECTORY_DOWNLOADS,"MyAndroidApp.apk");
downloadReference = downloadManager.enqueue(request);
}
})
.setNegativeButton("Remind Later", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// User cancelled the dialog
}
});
//show the alert message
builder.create().show();
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
//broadcast receiver to get notification about ongoing downloads
private BroadcastReceiver downloadReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
//check if the broadcast message is for our Enqueued download
long referenceId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
if(downloadReference == referenceId){
Log.v(LOG_TAG, "Downloading of the new app version complete");
//start the installation of the latest version
Intent installIntent = new Intent(Intent.ACTION_VIEW);
installIntent.setDataAndType(downloadManager.getUriForDownloadedFile(downloadReference),
"application/vnd.android.package-archive");
installIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(installIntent);
}
}
};
}
Reference
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