Pagination of results.

app/src/main/java/pl/tpolgrabia/urbanexplorer/exceptions/PanoramioResponseNotExpected.java

@@ -0,0 +1,10 @@
+package pl.tpolgrabia.urbanexplorer.exceptions;
+
+/**
+ * Created by tpolgrabia on 27.08.16.
+ */
+public class PanoramioResponseNotExpected extends RuntimeException {
+    public PanoramioResponseNotExpected(String errorCause) {
+        super(errorCause);
+    }
+}

app/src/main/java/pl/tpolgrabia/urbanexplorer/fragments/HomeFragment.java

@@ -8,24 +8,23 @@ import android.location.LocationManager;
 import android.os.Bundle;
 import android.provider.Settings;
 import android.support.v4.app.Fragment;
+import android.text.Editable;
+import android.text.TextWatcher;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.ArrayAdapter;
+import android.widget.*;
-import android.widget.ListView;
-import android.widget.TextView;
-import android.widget.Toast;
 import com.androidquery.AQuery;
 import com.androidquery.callback.AjaxCallback;
 import com.androidquery.callback.AjaxStatus;
-import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
 import pl.tpolgrabia.urbanexplorer.R;
 import pl.tpolgrabia.urbanexplorer.dto.PanoramioImageInfo;
+import pl.tpolgrabia.urbanexplorer.utils.NumberUtils;
+import pl.tpolgrabia.urbanexplorer.utils.PanoramioUtils;
 
-import java.util.ArrayList;
 import java.util.List;
 
 import static android.content.Context.LOCATION_SERVICE;
@@ -47,6 +46,14 @@ public class HomeFragment extends Fragment implements LocationListener {
     private boolean locationServicesActivated = false;
     private AQuery aq;
     private View inflatedView;
+    private TextView pageSizeWidget;
+    private TextView pageIdWidget;
+    private Long pageId = 1L;
+    private ListView locations;
+    private Button prevWidget;
+    private Button nextWidget;
+    private Long photosCount;
+    private TextView locationsResultInfo;
 
     public HomeFragment() {
         // Required empty public constructor
@@ -108,53 +115,148 @@ public class HomeFragment extends Fragment implements LocationListener {
 //            }
 //        );
 
-        final ListView locations = (ListView)inflatedView.findViewById(R.id.locations);
+        locations = (ListView)inflatedView.findViewById(R.id.locations);
         inflatedView.findViewById(R.id.update_places).setOnClickListener(
             new View.OnClickListener() {
                 @Override
                 public void onClick(View view) {
-                    Location location = locationService.getLastKnownLocation(locationProvider);
+                    fetchPanoramioLocations();
-                    aq.ajax("http://www.panoramio.com/map/get_panoramas.php?set=public" +
-                            "&from=0&to=20&minx=-180&miny=-90&maxx=180&maxy=90&size=medium&mapfilter=true",
-                        JSONObject.class,
-                        new AjaxCallback<JSONObject>() {
-                            @Override
-                            public void callback(String url, JSONObject object, AjaxStatus status) {
-                                try {
-                                    Log.d(CLASS_TAG, "Query code: " + status.getCode()
-                                        + ", error: " + status.getError() + ", message: " + status.getMessage());
-                                    if (object == null) {
-                                        return;
-                                    }
-
-                                    JSONArray photos = object.getJSONArray("photos");
-                                    List<PanoramioImageInfo> photosInfos = new ArrayList<PanoramioImageInfo>();
-                                    int n = photos.length();
-                                    for (int i = 0; i < n; i++) {
-                                        JSONObject photo = photos.getJSONObject(i);
-                                        PanoramioImageInfo info = new PanoramioImageInfo();
-                                        info.setPhotoTitle(photo.getString("photo_title"));
-                                        info.setPhotoFileUrl(photo.getString("photo_file_url"));
-                                        info.setWidth(photo.getDouble("width"));
-                                        info.setHeight(photo.getDouble("height"));
-                                        photosInfos.add(info);
-                                    }
-                                    ArrayAdapter<PanoramioImageInfo> adapter = new PanoramioAdapter(getActivity(),
-                                        R.layout.location_item,
-                                        photosInfos);
-                                    locations.setAdapter(adapter);
-                                } catch (JSONException e) {
-                                    Log.w(CLASS_TAG, "Json not supported format", e);
-                                }
-                            }
-                        });
                 }
             }
         );
 
+        pageSizeWidget = (TextView) inflatedView.findViewById(R.id.locations_page_size);
+        pageIdWidget = (TextView) inflatedView.findViewById(R.id.locations_page_id);
+
+        pageIdWidget.addTextChangedListener(new TextWatcher() {
+            @Override
+            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
+                Log.d(CLASS_TAG, "Before text changed");
+            }
+
+            @Override
+            public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
+                pageId = Math.max(1, NumberUtils.safeParseLong(charSequence));
+                Log.d(CLASS_TAG, "text changed");
+            }
+
+            @Override
+            public void afterTextChanged(Editable editable) {
+                Log.d(CLASS_TAG, "After text changed");
+            }
+        });
+
+        pageSizeWidget.addTextChangedListener(new TextWatcher() {
+            @Override
+            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
+                Log.d(CLASS_TAG, "Before text changed");
+            }
+
+            @Override
+            public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
+                fetchPanoramioLocations();
+                Log.d(CLASS_TAG, "text changed");
+            }
+
+            @Override
+            public void afterTextChanged(Editable editable) {
+                Log.d(CLASS_TAG, "After text changed");
+            }
+        });
+
+        prevWidget = (Button)inflatedView.findViewById(R.id.prev);
+        nextWidget = (Button)inflatedView.findViewById(R.id.next);
+
+        prevWidget.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                if (pageId > 1) {
+                    pageId--;
+                    pageIdWidget.setText(Long.toString(pageId));
+                    fetchPanoramioLocations();
+                }
+            }
+        });
+
+        nextWidget.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                pageId++;
+                pageIdWidget.setText(Long.toString(pageId));
+                fetchPanoramioLocations();
+            }
+        });
+
         return inflatedView;
     }
 
+    private void fetchPanoramioLocations() {
+
+        Location location = locationService.getLastKnownLocation(locationProvider);
+        Double radiusX = fetchRadiusX();
+        Double radiusY = fetchRadiusY();
+        final String aqQuery = "http://www.panoramio.com/map/get_panoramas.php?" +
+            "set=public" +
+            "&from=" + (pageId - 1) * fetchLocationPageSize() +
+            "&to="   + pageId * fetchLocationPageSize() +
+            "&minx=" + (location.getLongitude() - radiusX) +
+            "&miny=" + (location.getLatitude() - radiusY) +
+            "&maxx=" + (location.getLongitude() + radiusX) +
+            "&maxy=" + (location.getLatitude() + radiusX) +
+            "&size=medium" +
+            "&mapfilter=true";
+        Log.d(CLASS_TAG, "Query: " + aqQuery);
+        aq.ajax(aqQuery,
+            JSONObject.class,
+            new AjaxCallback<JSONObject>() {
+                @Override
+                public void callback(String url, JSONObject object, AjaxStatus status) {
+                    try {
+                        Log.d(CLASS_TAG, "Query code: " + status.getCode()
+                            + ", error: " + status.getError() + ", message: " + status.getMessage());
+                        if (object == null) {
+                            return;
+                        }
+
+                        List<PanoramioImageInfo> photosInfos =
+                            PanoramioUtils.fetchPanoramioImagesFromResponse(object);
+
+                        photosCount = PanoramioUtils.fetchPanoramioImagesCountFromResponse(object);
+                        locationsResultInfo = (TextView)inflatedView.findViewById(R.id.locations_result_info);
+                        Long pageSize = fetchLocationPageSize();
+                        Long start = (pageId - 1) * pageSize + 1;
+                        Long end = pageId * pageSize;
+                        locationsResultInfo.setText("" + start + "-" + end + " from " + photosCount);
+
+                        ArrayAdapter<PanoramioImageInfo> adapter = new PanoramioAdapter(getActivity(),
+                            R.layout.location_item,
+                            photosInfos);
+                        locations.setAdapter(adapter);
+                    } catch (JSONException e) {
+                        Log.w(CLASS_TAG, "Json not supported format", e);
+                    }
+                }
+            });
+    }
+
+    private Long fetchLocationPageSize() {
+        return NumberUtils.safeParseLong(pageSizeWidget.getText());
+    }
+
+    private Long fetchLocationPageId() {
+        return Math.max(0L, NumberUtils.safeParseLong(pageIdWidget.getText()));
+    }
+
+    private Double fetchRadiusX() {
+        final TextView radiusxTextView = (TextView) inflatedView.findViewById(R.id.location_xrange);
+        return safeParseDouble(radiusxTextView.getText());
+    }
+
+    private Double fetchRadiusY() {
+        final TextView radiusyTextView = (TextView) inflatedView.findViewById(R.id.location_yrange);
+        return safeParseDouble(radiusyTextView.getText());
+    }
+
     @Override
     public void onLocationChanged(Location location) {
         Log.i(CLASS_TAG, "Location provider changed: " + location);

app/src/main/java/pl/tpolgrabia/urbanexplorer/utils/NumberUtils.java

@@ -0,0 +1,19 @@
+package pl.tpolgrabia.urbanexplorer.utils;
+
+/**
+ * Created by tpolgrabia on 27.08.16.
+ */
+public class NumberUtils {
+    public static Long safeParseLong(CharSequence charSequence) {
+        if (charSequence == null) {
+            return 1L;
+        }
+
+        try {
+            return Long.parseLong(charSequence.toString());
+        } catch (NumberFormatException e) {
+            return 1L;
+        }
+
+    }
+}

app/src/main/java/pl/tpolgrabia/urbanexplorer/utils/PanoramioUtils.java

@@ -0,0 +1,51 @@
+package pl.tpolgrabia.urbanexplorer.utils;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+import pl.tpolgrabia.urbanexplorer.dto.PanoramioImageInfo;
+import pl.tpolgrabia.urbanexplorer.exceptions.PanoramioResponseNotExpected;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Created by tpolgrabia on 27.08.16.
+ */
+public class PanoramioUtils {
+
+    public static PanoramioImageInfo fetchPanoramioDto(JSONObject photo) throws JSONException {
+        PanoramioImageInfo info = new PanoramioImageInfo();
+        info.setPhotoTitle(photo.getString("photo_title"));
+        info.setPhotoFileUrl(photo.getString("photo_file_url"));
+        info.setWidth(photo.getDouble("width"));
+        info.setHeight(photo.getDouble("height"));
+        return info;
+    }
+
+    public static Long fetchPanoramioImagesCountFromResponse(JSONObject object) {
+        try {
+            return object.getLong("count");
+        } catch (JSONException e) {
+            return null;
+        }
+    }
+
+    public static List<PanoramioImageInfo> fetchPanoramioImagesFromResponse(JSONObject object) throws JSONException {
+
+        JSONArray photos = object.getJSONArray("photos");
+        if (photos == null) {
+            throw new PanoramioResponseNotExpected("Panoramio response doesn't contain phots");
+        }
+
+        List<PanoramioImageInfo> photosInfos = new ArrayList<PanoramioImageInfo>();
+        int n = photos.length();
+        for (int i = 0; i < n; i++) {
+            photosInfos.add(
+                fetchPanoramioDto(
+                    photos.getJSONObject(i)));
+        }
+
+        return photosInfos;
+    }
+}

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

@@ -16,13 +16,25 @@
                   android:orientation="horizontal">
         <TextView android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
-                  android:text="Location range"/>
+                  android:text="@string/location_xrange"/>
 
-        <EditText android:id="@+id/location_range"
+        <EditText android:id="@+id/location_xrange"
                   android:layout_width="0dp"
                   android:layout_height="wrap_content"
                   android:inputType="numberDecimal"
-                  android:layout_weight="1"/>
+                  android:layout_weight="1"
+                  android:text="0.05"/>
+
+        <TextView android:layout_width="wrap_content"
+                  android:layout_height="wrap_content"
+                  android:text="@string/location_yrange"/>
+
+        <EditText android:id="@+id/location_yrange"
+                  android:layout_width="0dp"
+                  android:layout_height="wrap_content"
+                  android:inputType="numberDecimal"
+                  android:layout_weight="1"
+                  android:text="0.05"/>
 
     </LinearLayout>
 
@@ -34,14 +46,36 @@
 
     </ListView>
 
+    <TextView android:id="@+id/locations_result_info"
+              android:layout_width="match_parent"
+              android:layout_height="wrap_content"
+              android:gravity="center"/>
+
     <LinearLayout android:layout_width="match_parent"
                   android:layout_height="wrap_content"
                   android:gravity="center">
-        <Button android:layout_width="wrap_content"
+        <Button android:id="@+id/prev"
-                android:layout_height="wrap_content"
+                android:layout_width="wrap_content"
+                android:layout_height="match_parent"
                 android:text="Prev"/>
-        <Button android:layout_width="wrap_content"
+
-                android:layout_height="wrap_content"
+        <EditText
+                android:id="@+id/locations_page_id"
+                android:layout_width="40dp"
+                android:gravity="center"
+                android:layout_height="match_parent"
+                android:text="1"/>
+
+        <EditText
+                android:id="@+id/locations_page_size"
+                android:layout_width="40dp"
+                android:gravity="center"
+                android:layout_height="match_parent"
+                android:text="10"/>
+
+        <Button android:id="@+id/next"
+                android:layout_width="wrap_content"
+                android:layout_height="match_parent"
                 android:text="Next"/>
     </LinearLayout>
 

app/src/main/res/values/strings.xml

@@ -11,4 +11,6 @@
     <string name="login">Login</string>
     <string name="location_update_frequency">Location update frequency</string>
     <string name="save">Save</string>
+    <string name="location_yrange">Location y-range</string>
+    <string name="location_xrange">Location x-range</string>
 </resources>