Added some Docs

src/main/java/device/fitbitdata/Device.java

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+package device.fitbitdata;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+
+import java.util.List;
+import java.util.Map;
+
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class Device {
+
+    public String lastSyncTime;
+
+   // @JsonProperty ("lastSyncTime")
+    public String getLastSyncTime(List<Map<String,String>> sync){
+        lastSyncTime = null;
+        for(Map<String, String > d: sync) {
+            String temp = d.get("lastSyncTime");
+            if ((lastSyncTime == null) || (lastSyncTime.compareTo(temp) < 0))
+                lastSyncTime = temp;
+        }
+        return lastSyncTime;
+    }
+
+}

src/main/java/device/fitbitdata/HeartRate.java

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+package device.fitbitdata;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+
+import java.util.List;
+import java.util.Map;
+
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class HeartRate {
+
+    private String dateTime;
+    private double average;
+
+    public double getAverage() {
+        return average;
+    }
+
+    @JsonProperty("activities-heart")
+    public void quelloCheVoglio(Map<String, Object>[] activities){
+        dateTime = (String) activities[0].get("dateTime");
+    }
+
+    @JsonProperty("activities-heart-intraday")
+    public void setAverage(Map<String, Object> map) {
+        List<Map> data = (List) map.get("dataset");
+
+        int sum = 0;
+        for(Map<String, Object> dat: data)
+            sum += (int)dat.get("value");
+        average = ((double)sum)/data.size();
+
+        if(data.size() == 0)
+            average = 0;
+    }
+}

src/main/java/device/fitbitdata/Sleep.java

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+package device.fitbitdata;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import java.util.Map;
+
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class Sleep {
+
+    private int minutesAsleep;
+
+    public int getMinutesAsleep() {
+        return minutesAsleep;
+    }
+
+    @JsonProperty("summary")
+    public void setMinutesAsleep(Map<String, Object> map) {
+        minutesAsleep = (int) map.get("totalMinutesAsleep");
+    }
+}

src/main/java/device/fitbitdata/Steps.java

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+package device.fitbitdata;
+
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Map;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class Steps {
+
+	private int steps=0;
+	
+	@JsonProperty("activities-steps")
+	public void setSteps(Map<String, String>[] array) {
+		SimpleDateFormat sdfDate = new SimpleDateFormat("yyyy-MM-dd");
+	    Date now = new Date();
+	    String strDate = sdfDate.format(now);
+	    
+		for(Map<String, String> map : array)
+			if(map.get("dateTime").equals(strDate))
+				steps = Integer.parseInt(map.get("value"));
+	}
+	
+	public int getSteps() {
+		return steps;
+	}
+
+}