Read events from android calendars, one week in the future.

- Needs new permission.
- Stores the details needed for the pebble timeline and the miband
- Device support to be done

app/src/main/AndroidManifest.xml

@@ -16,6 +16,7 @@
     <uses-permission android:name="android.permission.READ_CONTACTS" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
     <uses-permission android:name="com.fsck.k9.permission.READ_MESSAGES" />
+    <uses-permission android:name="android.permission.READ_CALENDAR"/>
 
     <uses-feature
         android:name="android.hardware.bluetooth"

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/model/CalendarEvents.java

@@ -0,0 +1,132 @@
+package nodomain.freeyourgadget.gadgetbridge.model;
+
+import android.content.ContentUris;
+import android.content.Context;
+import android.database.Cursor;
+import android.net.Uri;
+import android.provider.CalendarContract;
+import android.provider.CalendarContract.Instances;
+
+import java.util.ArrayList;
+import java.util.Calendar;
+import java.util.GregorianCalendar;
+import java.util.List;
+
+public class CalendarEvents {
+
+    // needed for pebble: time, duration, layout, reminders, actions
+    // layout: type, title, subtitle, body (max 512), tinyIcon, smallIcon, largeIcon
+    //further: primaryColor, secondaryColor, backgroundColor, headings, paragraphs, lastUpdated
+    // taken from: https://developer.getpebble.com/guides/timeline/pin-structure/
+
+    // needed for miband:
+    // time
+
+    private static final String[] EVENT_INSTANCE_PROJECTION = new String[] {
+            Instances._ID,
+            Instances.BEGIN,
+            Instances.END,
+            Instances.EVENT_ID,
+            Instances.TITLE,
+            Instances.DESCRIPTION,
+            Instances.EVENT_LOCATION,
+            Instances.CALENDAR_DISPLAY_NAME
+    };
+
+    private static final int lookahead_days = 7;
+
+    private List<CalendarEvent> calendarEventList = new ArrayList<CalendarEvent>();
+
+    public List<CalendarEvent> getCalendarEventList(Context mContext) {
+        fetchSystemEvents(mContext);
+        return calendarEventList;
+    }
+
+    private boolean fetchSystemEvents(Context mContext) {
+
+        Calendar cal = GregorianCalendar.getInstance();
+        Long dtStart = cal.getTime().getTime();
+        cal.add(Calendar.DATE, lookahead_days);
+        Long dtEnd = cal.getTime().getTime();
+
+        Uri.Builder eventsUriBuilder = CalendarContract.Instances.CONTENT_URI.buildUpon();
+        ContentUris.appendId(eventsUriBuilder, dtStart);
+        ContentUris.appendId(eventsUriBuilder, dtEnd);
+        Uri eventsUri = eventsUriBuilder.build();
+
+        Cursor evtCursor = null;
+        evtCursor = mContext.getContentResolver().query(eventsUri, EVENT_INSTANCE_PROJECTION, null, null, CalendarContract.Instances.DTSTART + " ASC");
+
+        if (evtCursor.moveToFirst()) {
+            do {
+                CalendarEvent calEvent = new CalendarEvent(
+                        evtCursor.getLong(1),
+                        evtCursor.getLong(2),
+                        evtCursor.getLong(3),
+                        evtCursor.getString(4),
+                        evtCursor.getString(5),
+                        evtCursor.getString(6),
+                        evtCursor.getString(7)
+                        );
+                calendarEventList.add(calEvent);
+            } while(evtCursor.moveToNext());
+
+            return true;
+        }
+        return false;
+    }
+
+    public class CalendarEvent {
+        private long begin;
+        private long end;
+        private long id;
+        private String title;
+        private String description;
+        private String location;
+        private String calName;
+
+        public CalendarEvent(long begin, long end, long id, String title, String description, String location, String calName) {
+            this.begin = begin;
+            this.end = end;
+            this.id = id;
+            this.title = title;
+            this.description = description;
+            this.location = location;
+            this.calName = calName;
+        }
+
+        public long getBegin() {
+            return begin;
+        }
+
+        public long getEnd() {
+            return end;
+        }
+
+        public long getDuration() {
+            return end - begin;
+        }
+
+
+        public long getId() {
+            return id;
+        }
+
+        public String getTitle() {
+            return title;
+        }
+
+        public String getDescription() {
+            return description;
+        }
+
+        public String getLocation() {
+            return location;
+        }
+
+        public String getCalName() {
+            return calName;
+        }
+
+    }
+}