implement list of rented bikes

app/src/main/java/com/example/hochi/nextcompanion/MainActivity.java

@@ -8,11 +8,22 @@ import android.support.design.widget.FloatingActionButton;
 import android.support.design.widget.Snackbar;
 import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
+import android.util.Log;
 import android.view.View;
 import android.view.Menu;
 import android.view.MenuItem;
+import android.widget.AdapterView;
+import android.widget.ArrayAdapter;
+import android.widget.ListView;
 
-public class MainActivity extends AppCompatActivity {
+import org.json.JSONArray;
+import org.json.JSONObject;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+
+public class MainActivity extends AppCompatActivity implements AsyncTaskCallbacks<String> {
+    private RequestHandler getBikesTask = null;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -45,6 +56,9 @@ public class MainActivity extends AppCompatActivity {
             Intent intent = new Intent(this, LoginActivity.class);
             startActivity(intent);
         }
+        else {
+            reloadBikeList();
+        }
     }
 
     @Override
@@ -69,4 +83,55 @@ public class MainActivity extends AppCompatActivity {
         return super.onOptionsItemSelected(item);
     }
 
+    protected void reloadBikeList() {
+        //get loginkey
+        SharedPreferences sharedPref = getSharedPreferences("persistence", MODE_PRIVATE);
+        String defaultValue = "nokey";
+        String loginKey = sharedPref.getString("loginKey", defaultValue);
+
+        String[] params = {
+                "apikey=", getString(R.string.apikey),
+                "loginkey=", loginKey
+        };
+
+        getBikesTask = new RequestHandler(this, "POST",
+                "api/getOpenRentals.json", params);
+        getBikesTask.execute((Void) null);
+    }
+
+    @Override
+    public void onTaskComplete(String response) {
+        if (!response.isEmpty()) {
+            final ArrayList<String> list = new ArrayList<>();
+            try {
+                JSONObject jObject = new JSONObject(response);
+                JSONArray bikesArray = jObject.getJSONArray("rentalCollection");
+
+                for (int i = 0; i < bikesArray.length(); i++) {
+                    String entry;
+                    JSONObject bike = bikesArray.getJSONObject(i);
+                    entry = "Bike " + bike.getString("bike")
+                            + " with lock code " + bike.getString("code");
+                    list.add(entry);
+                }
+                Log.d("DEBUG", list.toString());
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+            final ListView listview = findViewById(R.id.listview);
+            final ArrayAdapter<String> adapter = new ArrayAdapter<>(this,
+                    android.R.layout.simple_list_item_1, list);
+            listview.setAdapter(adapter);
+            listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
+                @Override
+                public void onItemClick(AdapterView<?> parent, final View view, int position, long id) {
+                    //TODO: Return bike
+                }
+
+            });
+        }
+        else {
+            //TODO: implement error handling
+        }
+    }
 }

app/src/main/java/com/example/hochi/nextcompanion/RequestHandler.java

@@ -15,10 +15,14 @@ import java.net.URLEncoder;
 
 public class RequestHandler extends AsyncTask<Void, Void, String> {
 
+    private String mHTTPmethod;
+    private String mEndpoint;
     private AsyncTaskCallbacks<String> callback;
     private String[] mCredentials;
 
-    RequestHandler(String[] credentials, AsyncTaskCallbacks<String> act) {
+    RequestHandler(AsyncTaskCallbacks<String> act, String HTTPmethod, String endpoint, String[] credentials) {
+        mHTTPmethod = HTTPmethod;
+        mEndpoint = endpoint;
         mCredentials = credentials;
         callback = act;
     }
@@ -36,9 +40,10 @@ public class RequestHandler extends AsyncTask<Void, Void, String> {
         HttpURLConnection connection = null;
         try {
             //Create connection
-            URL url = new URL("https://api.nextbike.net/api/login.json");
+            URL url = new URL("https://api.nextbike.net/" + mEndpoint);
             connection = (HttpURLConnection) url.openConnection();
-            connection.setRequestMethod("POST");
+            connection.setRequestMethod(mHTTPmethod);
+            if(mHTTPmethod.equals("POST")) {
                 connection.setRequestProperty("Content-Type",
                         "application/x-www-form-urlencoded");
 
@@ -46,10 +51,10 @@ public class RequestHandler extends AsyncTask<Void, Void, String> {
                         Integer.toString(urlParameters.toString().getBytes().length));
                 connection.setRequestProperty("Content-Language", "en-US");
 
-            connection.setUseCaches (false);
+                connection.setUseCaches(false);
                 connection.setDoInput(true);
                 connection.setDoOutput(true);
-
+            }
             //Send request
             DataOutputStream wr = new DataOutputStream (
                     connection.getOutputStream ());

app/src/main/res/layout/content_main.xml

@@ -8,13 +8,10 @@
     tools:context=".MainActivity"
     tools:showIn="@layout/activity_main">
 
-    <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+    <ListView xmlns:android="http://schemas.android.com/apk/res/android"
+        android:id="@+id/listview"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" />
+
 
 </android.support.constraint.ConstraintLayout>