HTTP GET and POST failing on Android

Question

I'm am building an Android application that communications with googles Service Auth using HTTP Get and HTTP Post to authenticate my google credentials and return a result.

This program works perfectly on my Desktop PC but when I move the code to an android activity and try to use it there, it fails everytime. Any ideas on why this could be? Is there a reason why a HTTP Post or get won't work in an Android app?

Yes - I have the following permission in my manifest :

<uses-permission android:name="android.permission.INTERNET" />

My code in a nutshell is as follows :

    URL obj = new URL(url);
    conn = (HttpsURLConnection) obj.openConnection();

    // default is GET
    conn.setRequestMethod("GET");

    conn.setUseCaches(false);

    // act like a browser
    conn.setRequestProperty("User-Agent", USER_AGENT);
    conn.setRequestProperty("Accept",
            "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
    conn.setRequestProperty("Accept-Language", "en-US,en;q=0.5");
    if (cookies != null) {
        for (String cookie : this.cookies) {
            conn.addRequestProperty("Cookie", cookie.split(";", 1)[0]);
        }
    }
    int responseCode = conn.getResponseCode();
    /* System.out.println("\nSending 'GET' request to URL : " + url);
    System.out.println("Response Code : " + responseCode); */

    BufferedReader in = 
            new BufferedReader(new InputStreamReader(conn.getInputStream()));
    String inputLine;
    StringBuffer response = new StringBuffer();

    while ((inputLine = in.readLine()) != null) {
        response.append(inputLine);
    }
    in.close();

    // Get the response cookies
    setCookies(conn.getHeaderFields().get("Set-Cookie"));

    return response.toString();

Where the user connection is ""Mozilla/5.0"" and the URL is "https://accounts.google.com/ServiceLoginAuth"

Also, Logcat keeps throwing the following error :

11-15 22:10:04.595  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ Caused by: libcore.io.ErrnoException: open failed: EACCES (Permission denied)
11-15 22:10:04.595  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at libcore.io.Posix.open(Native Method)
11-15 22:10:04.595  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
11-15 22:10:04.595  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at java.io.File.createNewFile(File.java:939)
11-15 22:10:04.595  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ ... 17 more
11-15 22:10:04.595  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ java.io.FileNotFoundException: /storage/emulated/0/Download/log.file: open failed: EACCES (Permission denied)
11-15 22:10:04.595  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at libcore.io.IoBridge.open(IoBridge.java:409)
11-15 22:10:04.595  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at java.io.FileOutputStream.<init>(FileOutputStream.java:88)
11-15 22:10:04.595  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at java.io.FileWriter.<init>(FileWriter.java:58)
11-15 22:10:04.595  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at mattmcgrath.me.locationhistoryapp.ConnectToLocationHistory.appendLog(ConnectToLocationHistory.java:56)
11-15 22:10:04.595  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at mattmcgrath.me.locationhistoryapp.ConnectToLocationHistory.ConnectToGoogle(ConnectToLocationHistory.java:70)
11-15 22:10:04.600  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at mattmcgrath.me.locationhistoryapp.MyActivity.login(MyActivity.java:41)
11-15 22:10:04.600  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at java.lang.reflect.Method.invokeNative(Native Method)
11-15 22:10:04.600  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:515)
11-15 22:10:04.600  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at android.view.View$1.onClick(View.java:3825)
11-15 22:10:04.600  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at android.view.View.performClick(View.java:4445)
11-15 22:10:04.600  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at android.view.View$PerformClick.run(View.java:18446)
11-15 22:10:04.600  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at android.os.Handler.handleCallback(Handler.java:733)
11-15 22:10:04.600  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:95)
11-15 22:10:04.600  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at android.os.Looper.loop(Looper.java:136)
11-15 22:10:04.600  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5139)
11-15 22:10:04.600  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at java.lang.reflect.Method.invokeNative(Native Method)
11-15 22:10:04.600  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:515)
11-15 22:10:04.600  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:796)
11-15 22:10:04.600  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:612)
11-15 22:10:04.605  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at dalvik.system.NativeStart.main(Native Method)
11-15 22:10:04.605  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ Caused by: libcore.io.ErrnoException: open failed: EACCES (Permission denied)
11-15 22:10:04.605  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at libcore.io.Posix.open(Native Method)
11-15 22:10:04.605  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
11-15 22:10:04.605  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at libcore.io.IoBridge.open(IoBridge.java:393)
11-15 22:10:04.605  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ ... 19 more
11-15 22:10:05.220  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ android.os.NetworkOnMainThreadException
11-15 22:10:05.225  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1145)
11-15 22:10:05.225  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
11-15 22:10:05.230  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
11-15 22:10:05.230  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at java.net.InetAddress.getAllByName(InetAddress.java:214)
11-15 22:10:05.230  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at com.android.okhttp.internal.Dns$1.getAllByName(Dns.java:28)
11-15 22:10:05.230  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:216)
11-15 22:10:05.230  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:122)
11-15 22:10:05.230  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:292)
11-15 22:10:05.230  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at com.android.okhttp.internal.http.HttpEngine.sendSocketRequest(HttpEngine.java:255)
11-15 22:10:05.230  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:206)
11-15 22:10:05.230  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:345)
11-15 22:10:05.235  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:296)
11-15 22:10:05.235  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:503)
11-15 22:10:05.235  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at com.android.okhttp.internal.http.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:136)
11-15 22:10:05.235  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at mattmcgrath.me.locationhistoryapp.ConnectToLocationHistory.GetPageContent(ConnectToLocationHistory.java:164)
11-15 22:10:05.235  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at mattmcgrath.me.locationhistoryapp.ConnectToLocationHistory.ConnectToGoogle(ConnectToLocationHistory.java:82)
11-15 22:10:05.235  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at mattmcgrath.me.locationhistoryapp.MyActivity.login(MyActivity.java:41)
11-15 22:10:05.235  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at java.lang.reflect.Method.invokeNative(Native Method)
11-15 22:10:05.235  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:515)
11-15 22:10:05.235  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at android.view.View$1.onClick(View.java:3825)
11-15 22:10:05.235  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at android.view.View.performClick(View.java:4445)
11-15 22:10:05.235  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at android.view.View$PerformClick.run(View.java:18446)
11-15 22:10:05.235  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at android.os.Handler.handleCallback(Handler.java:733)
11-15 22:10:05.240  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:95)
11-15 22:10:05.240  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at android.os.Looper.loop(Looper.java:136)
11-15 22:10:05.240  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5139)
11-15 22:10:05.240  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at java.lang.reflect.Method.invokeNative(Native Method)
11-15 22:10:05.240  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:515)
11-15 22:10:05.240  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:796)
11-15 22:10:05.240  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:612)
11-15 22:10:05.240  24998-24998/mattmcgrath.me.locationhistoryapp W/System.err﹕ at dalvik.system.NativeStart.main(Native Method)
11-15 22:10:05.250  24998-24998/mattmcgrath.me.locationhistoryapp I/Choreographer﹕ Skipped 43 frames!  The application may be doing too much work on its main thread.

Answer 1

I see that you're getting a NetworkOnMainThreadException which basically means that you should execute your requests on a separate thread.