Develop Reference

Android App HTTP connection to server (Server upgrade to HTTPS)

I has an android app that AndroidManifest set to usesCleartextTraffic="true" because it is using http to connection to server.
But, now i plan to update the server to use HTTPS, and the server will redirect all http to https.
So, i want to know, if server redirect all traffic to HTTPS, will the android app that access the server using HTTP still working?
Example i am using the java code below to access server content. So will app still able to read the content at the app.php, if server update to use HTTPS? (server set to redirect all http to https)
String urls = "http://www.example.com/app.php";
URL url = new URL(urls);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestProperty("Cache-Control", "no-cache");
content = readStream(conn.getInputStream());
Thanks in advance

Spotify Android - Make Authorized Web Requests

I'm working on an Android app that implements the Spotify API to allow the users to listen to music. I've configured the Player that Spotify has created for android devices, but it's incredibly limited in terms of its functionality, so I've had to go through Spotify's Web API to do more advanced features.
I've hit a bug when trying to get a list of the user's own playlists. I'm making a request using:
URL url = new URL("https://api.spotify.com/v1/me/playlists");
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
But instead of this command going through like it does for the other web API requests I've made, it throws the error:
java.io.FileNotFoundException: https://api.spotify.com/v1/me/playlists
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:242)
at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.getInputStream(DelegatingHttpsURLConnection.java:210)
at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:25)
at com.tmacstudios.spotifyvoice.WebWrapper$override.searchUserPlaylist(WebWrapper.java:257)
at com.tmacstudios.spotifyvoice.WebWrapper$override.access$dispatch(WebWrapper.java)
at com.tmacstudios.spotifyvoice.WebWrapper.searchUserPlaylist(WebWrapper.java:0)
at com.tmacstudios.spotifyvoice.MainActivity$6.run(MainActivity.java:382)
at java.lang.Thread.run(Thread.java:818)
I'm not entirely sure why I'm getting this error, but I think it may have to do with not having the necessary authorization to make this request. Can anyone please help me solve this problem?

After studying the documentation some more, I was able to figure out a way to solve my problem. I was in fact getting the error since I wasn't using the proper authorization.
You can get the authorization token in OnActivityResult using this code:
AuthenticationResponse response = AuthenticationClient.getResponse(resultCode, intent);
if (response.getType() == AuthenticationResponse.Type.TOKEN) {
authToken = response.getAccessToken();
Log.e("MainActivity","Auth Token: "+authToken.toString());
...
Then when making the URL request, just pass in the authorization token as a header.
URL url = new URL("https://api.spotify.com/v1/me/playlists");
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestProperty("Authorization", "Bearer " + authToken);
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
...
Also note that you must have the permissions you are using enabled as scopes when you are forming the authorization request initially.

Android application connect to local area Wamp Server

I need to connect my app to the wamp server located in my machine within my LAN, in order to test an api I am currently developing. While using the phone internet browser, I can access the ip address for api viewing, but using something similar to the following code does not work.
URL url = new URL("192.168.1.1/api/v1/home");
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
Please give some suggestions in order to be able to test this.

Try adding http before the link
URL url = new URL("http://192.168.1.1/api/v1/home");
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");

Are you using the emulator? If so change your IP to this: http://10.0.2.2

Android how to make GET or POST Http Request using url with an IP address instead of HostName

Hi all I am trying to send data to my development database from android application using Post but am getting exception
09-18 15:23:36.801: W/System.err(6755): java.io.FileNotFoundException: http://10.255.162.84:8080/web/events
09-18 15:23:36.801: W/System.err(6755): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:1162)
If I copy paste the url the web browser in my computer. the webpage I am trying to get works.
If I replace the url with https:www.google.com in my application, it works.
What does this mean? I can't connect make http connection without a host name?
code
URL url = new URL("http://10.255.162.84:8080/web/events");
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.setReadTimeout(20000 /*millis*/);
conn.setConnectTimeout(15000 /*millis*/);
conn.setRequestMethod("GET");
conn.setDoInput(true);
conn.setDoOutput(true);
conn.connect();
System.out.println(conn.getResponseCode());
InputStream is = conn.getInputStream();
Reader reader = new InputStreamReader(is, "UTF-8");
char[] buffer = new char[500];
reader.read(buffer);
System.out.println(new String(buffer));
Additional information
The server to receive get and post requests is running on my PC port 8080 via a broadband connection.
I am running the application on my low end phone running android 2.2 (Froyo)
I hope that's all the relevant information but am glad to provide more. I know you get this all the time but I swear to you I am really new to android

I'm guessing your android device is not on the same network as your computer. You can test this easily by pasting the url into an android browser and checking to see if it works. Your server is most likely behind your network's firewall. You'll need to configure port forwarding to allow external clients to connect.

Internet connection not working on some networks

I have an app that reads in an XML file, parse it and display certain elements from the xml file to the user. The problem I am having is that the network connection to the server that contains the XML file works on some networks but not on others. For example it works on my home network and the mobile 3g that comes with the phone but when I test it on the University network and the office network it cannot get a connection.
I don't understand why this is and don't know how I would fix it. I am using an HttpURLConnection to connect to the server.
URL url = new URL(urlString);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(10000 /* milliseconds */);
conn.setConnectTimeout(15000 /* milliseconds */);
conn.setRequestMethod("GET");
conn.setDoInput(true);
urlString is the web address. I have added the permission on manifest.
<uses-permission android:name="android.permission.INTERNET" />

most probably,open Internet is not available on your University /Office network or might be the url you are trying to access is blocked on these networks.
Try to browse the same url through Browser App in your phone. This will give you a better picture of the problem.