disable splash screen on JS error and HTTP response error code (fixes #475)

mobile/src/com/cradle/iitc_mobile/async/CheckHttpResponse.java

@@ -0,0 +1,48 @@
+package com.cradle.iitc_mobile.async;
+
+import android.os.AsyncTask;
+import android.util.Log;
+
+import com.cradle.iitc_mobile.IITC_JSInterface;
+
+import org.apache.http.HttpResponse;
+import org.apache.http.HttpStatus;
+import org.apache.http.client.HttpClient;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.impl.client.DefaultHttpClient;
+
+import java.io.IOException;
+
+/*
+ * this class parses the http response of a web page.
+ * since network operations shouldn't be done on main UI thread
+ * (NetworkOnMainThread exception is thrown) we use an async task for this.
+ */
+public class CheckHttpResponse extends AsyncTask<String, Void, Void> {
+
+    private IITC_JSInterface mJsInterface;
+
+    public CheckHttpResponse(IITC_JSInterface jsInterface) {
+        mJsInterface = jsInterface;
+    };
+
+    @Override
+    protected Void doInBackground(String... urls) {
+        // check http responses and disable splash screen on error
+        HttpGet httpRequest = new HttpGet(urls[0]);
+        HttpClient httpclient = new DefaultHttpClient();
+        HttpResponse response = null;
+        try {
+            response = httpclient.execute(httpRequest);
+            int code = response.getStatusLine().getStatusCode();
+            if (code != HttpStatus.SC_OK) {
+                Log.d("iitcm", "received error code: " + code);
+                mJsInterface.removeSplashScreen();
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+}