first version solarCast

app/src/main/java/org/woheller69/weather/http/HttpRequestType.java

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+package org.woheller69.weather.http;
+
+/**
+ * A list of all the possible HTTP request types (there are more, for sure, but for this project
+ * the four below are definitely sufficient).
+ */
+public enum HttpRequestType {
+    POST,
+    GET,
+    PUT,
+    DELETE
+}

app/src/main/java/org/woheller69/weather/http/IHttpRequest.java

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+package org.woheller69.weather.http;
+
+import org.woheller69.weather.weather_api.IProcessHttpRequest;
+
+/**
+ * This interface defines the template for making HTTP request. Furthermore, it provides a generic
+ * way for handling the responses.
+ */
+public interface IHttpRequest {
+
+    /**
+     * Makes an HTTP request and processes the response.
+     *
+     * @param URL              The target of the HTTP request.
+     * @param method           Which method to use for the HTTP request (e.g. GET or POST)
+     * @param requestProcessor This object with its implemented methods processSuccessScenario and
+     *                         processFailScenario defines how to handle the response in the success
+     *                         and error case respectively.
+     */
+    void make(final String URL, HttpRequestType method, IProcessHttpRequest requestProcessor);
+
+}

app/src/main/java/org/woheller69/weather/http/VolleyHttpRequest.java

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+package org.woheller69.weather.http;
+
+import android.content.Context;
+import android.util.Log;
+
+import com.android.volley.Request;
+import com.android.volley.RequestQueue;
+import com.android.volley.Response;
+import com.android.volley.VolleyError;
+import com.android.volley.toolbox.HurlStack;
+import com.android.volley.toolbox.StringRequest;
+import com.android.volley.toolbox.Volley;
+
+import org.woheller69.weather.BuildConfig;
+import org.woheller69.weather.weather_api.IProcessHttpRequest;
+
+import java.io.BufferedInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.security.KeyManagementException;
+import java.security.KeyStore;
+import java.security.KeyStoreException;
+import java.security.NoSuchAlgorithmException;
+import java.security.cert.Certificate;
+import java.security.cert.CertificateException;
+import java.security.cert.CertificateFactory;
+import java.security.cert.X509Certificate;
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.TrustManagerFactory;
+
+/**
+ * This class implements the IHttpRequest interface. It provides HTTP requests by using Volley.
+ * See: https://developer.android.com/training/volley/simple.html
+ */
+public class VolleyHttpRequest implements IHttpRequest {
+
+    private Context context;
+    private int cityId;
+
+    /**
+     * Constructor.
+     *
+     * @param context Volley needs a context "for creating the cache dir".
+     * @see Volley#newRequestQueue(Context)
+     */
+    public VolleyHttpRequest(Context context, int cityId) {
+
+        this.context = context;
+        this.cityId = cityId;
+    }
+
+    /**
+     * @see IHttpRequest#make(String, HttpRequestType, IProcessHttpRequest)
+     */
+    @Override
+    public void make(String URL, HttpRequestType method, final IProcessHttpRequest requestProcessor) {
+        RequestQueue queue = Volley.newRequestQueue(context);
+
+        // Set the request method
+        int requestMethod;
+        switch (method) {
+            case POST:
+                requestMethod = Request.Method.POST;
+                break;
+            case GET:
+                requestMethod = Request.Method.GET;
+                break;
+            case PUT:
+                requestMethod = Request.Method.PUT;
+                break;
+            case DELETE:
+                requestMethod = Request.Method.DELETE;
+                break;
+            default:
+                requestMethod = Request.Method.GET;
+        }
+
+        // Execute the request and handle the response
+        StringRequest stringRequest = new StringRequest(requestMethod, URL,
+                new Response.Listener<String>() {
+                    @Override
+                    public void onResponse(String response) {
+                        requestProcessor.processSuccessScenario(response,cityId);
+                    }
+                },
+                new Response.ErrorListener() {
+                    @Override
+                    public void onErrorResponse(VolleyError error) {
+                        requestProcessor.processFailScenario(error);
+                    }
+                }
+        ){
+            @Override
+            public Map<String, String> getHeaders() {  //from https://stackoverflow.com/questions/17049473/how-to-set-custom-header-in-volley-request
+                Map<String, String> params = new HashMap<String, String>();
+                params.put("User-Agent", BuildConfig.APPLICATION_ID + "/" + BuildConfig.VERSION_NAME);
+                return params;
+            }
+        };
+
+        queue.add(stringRequest);
+    }
+
+
+}