Add copyright notice to the map.

Closes: #98

Author: zamojski

app/src/main/java/info/zamojski/soft/towercollector/views/MainMapFragment.java

@@ -9,12 +9,14 @@
 import android.location.Location;
 import android.os.AsyncTask;
 import android.os.Bundle;
+import android.text.method.LinkMovementMethod;
 import android.view.InputDevice;
 import android.view.LayoutInflater;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageButton;
+import android.widget.TextView;
 import android.widget.Toast;
 
 import androidx.annotation.DrawableRes;
@@ -152,6 +154,9 @@ protected void configureControls(View view) {
         myLocationButton = view.findViewById(R.id.main_map_my_location_button);
         myLocationButton.setOnLongClickListener(IMAGE_BUTTON_LONG_CLICK_LISTENER);
 
+        TextView copyrightTextView = view.findViewById(R.id.main_map_copyright);
+        copyrightTextView.setMovementMethod(LinkMovementMethod.getInstance());
+
         mainMapView.setTileSource(TileSourceFactory.MAPNIK);
         mainMapView.setMultiTouchControls(true);
         mainMapView.setMinZoomLevel(5.0);

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

@@ -56,6 +56,18 @@
             android:paddingVertical="10dp"
             android:src="@drawable/map_follow_me" />
 
+        <TextView
+            android:id="@+id/main_map_copyright"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_alignParentEnd="true"
+            android:layout_alignParentBottom="true"
+            android:background="?attr/icon_background_color"
+            android:paddingHorizontal="5dp"
+            android:text="@string/map_copyright"
+            android:textColor="?attr/icon_color"
+            android:textSize="@dimen/smallest_font" />
+
     </RelativeLayout>
 
 </LinearLayout>

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

@@ -10,6 +10,8 @@
     <string name="upload_url_opencellid_org" translatable="false">https://www.opencellid.org/measure/uploadCsv</string>
     <string name="upload_url_mls" translatable="false">https://location.services.mozilla.com/v2/geosubmit?key=<xliff:g id="api_key">%s</xliff:g></string>
 
+    <string name="map_copyright" translatable="false">© <a href="https://www.openstreetmap.org/copyright/">OpenStreetMap</a> contributors</string>
+
     <string name="file_provider_authority" translatable="false">info.zamojski.soft.towercollector.fileprovider</string>
 
     <string name="preferences_current_value_summary_format" translatable="false"><![CDATA[<br/><b>[%s]</b>]]></string>