don't allow to add a duplicated measurement with the exact same date and time.

android_app/app/src/main/java/com/health/openscale/core/OpenScale.java

@@ -210,14 +210,15 @@ public class OpenScale {
             scaleMeasurement.setFat(fatMetric.getFat(getScaleUser(scaleMeasurement.getUserId()), scaleMeasurement));
         }
 
-        if (measurementDAO.get(scaleMeasurement.getDateTime(), scaleMeasurement.getUserId()) == null) {
-            measurementDAO.insert(scaleMeasurement);
+        if (measurementDAO.insert(scaleMeasurement) != -1) {
             ScaleUser scaleUser = getScaleUser(scaleMeasurement.getUserId());
 
             String infoText = String.format(context.getString(R.string.info_new_data_added), scaleMeasurement.getConvertedWeight(scaleUser.getScaleUnit()), scaleUser.UNIT_STRING[scaleUser.getScaleUnit()], dateTimeFormat.format(scaleMeasurement.getDateTime()), scaleUser.getUserName());
             Toast.makeText(context, infoText, Toast.LENGTH_LONG).show();
             alarmHandler.entryChanged(context, scaleMeasurement);
             updateScaleData();
+        } else {
+            Toast.makeText(context, context.getString(R.string.info_new_data_duplicated), Toast.LENGTH_LONG).show();
         }
 
         return scaleMeasurement.getUserId();

android_app/app/src/main/java/com/health/openscale/core/database/ScaleMeasurementDAO.java

@@ -18,6 +18,7 @@ package com.health.openscale.core.database;
 
 import android.arch.persistence.room.Dao;
 import android.arch.persistence.room.Insert;
+import android.arch.persistence.room.OnConflictStrategy;
 import android.arch.persistence.room.Query;
 import android.arch.persistence.room.Update;
 
@@ -46,10 +47,10 @@ public interface ScaleMeasurementDAO {
     @Query("SELECT * FROM scaleMeasurements WHERE datetime >= :startYear AND datetime < :endYear AND userId = :userId AND enabled = 1 ORDER BY datetime DESC")
     List<ScaleMeasurement> getAllInRange(Date startYear, Date endYear, int userId);
 
-    @Insert
-    void insert(ScaleMeasurement measurement);
+    @Insert (onConflict = OnConflictStrategy.IGNORE)
+    long insert(ScaleMeasurement measurement);
 
-    @Insert
+    @Insert (onConflict = OnConflictStrategy.IGNORE)
     void insertAll(List<ScaleMeasurement> measurementList);
 
     @Update

android_app/app/src/main/java/com/health/openscale/gui/activities/DataEntryActivity.java

@@ -298,7 +298,8 @@ public class DataEntryActivity extends Activity {
         cal.setTime(dateMeasurement.getDateTime());
         cal.set(Calendar.HOUR_OF_DAY, time.get(Calendar.HOUR_OF_DAY));
         cal.set(Calendar.MINUTE, time.get(Calendar.MINUTE));
-        cal.set(Calendar.SECOND, time.get(Calendar.SECOND));
+        cal.set(Calendar.SECOND, 0);
+        cal.set(Calendar.MILLISECOND, 0);
 
         ScaleMeasurement scaleMeasurement = new ScaleMeasurement();
 

android_app/app/src/main/java/com/health/openscale/junit/DatabaseTest.java

@@ -17,7 +17,6 @@ package com.health.openscale.junit;
 
 import android.arch.persistence.room.Room;
 import android.content.Context;
-import android.database.sqlite.SQLiteConstraintException;
 import android.support.test.InstrumentationRegistry;
 import android.support.test.runner.AndroidJUnit4;
 
@@ -40,7 +39,6 @@ import java.util.List;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
 
 // run this test as an Android instrumented test!
 @RunWith(AndroidJUnit4.class)
@@ -179,16 +177,8 @@ public class DatabaseTest {
         assertEquals(25.0f, measurementDAO.getAll(user2).get(0).getWeight(), DELTA);
 
         // don't allow insertion with the same date
-        if (measurementDAO.get(measurement11.getDateTime(), user1) == null) {
-            measurementDAO.insert(measurement11);
-        }
-        assertEquals(3, measurementDAO.getAll(user1).size());
-
-        // test if SQLiteConstraintException exception is thrown if we want to try to insert a measurement with the same date
-        try {
-            measurementDAO.insert(measurement11);
-            fail("SQLiteConstraintException was not thrown while inserting measurement with the same date");
-        } catch (SQLiteConstraintException e) {}
+        long id = measurementDAO.insert(measurement11);
+        assertEquals(-1 , id);
         assertEquals(3, measurementDAO.getAll(user1).size());
 
         // test get(datetime) method

android_app/app/src/main/res/values-de/strings.xml

@@ -159,4 +159,5 @@
     <string name="open_drawer">öffnen</string>
     <string name="close_drawer">schließen</string>
     <string name="info_bluetooth_no_device_set">Kein Bluetooth Gerät ausgewählt</string>
+    <string name="info_new_data_duplicated">Messung mit gleichen Datum und Uhrzeit exisitiert bereits</string>
 </resources>

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

@@ -109,6 +109,7 @@
     <string name="info_bluetooth_init">Initialize Bluetooth device</string>
     <string name="info_bluetooth_connection_error">Bluetooth has an unexpected error</string>
     <string name="info_new_data_added">%1$.2f%2$s [%3$s] to %4$s added</string>
+    <string name="info_new_data_duplicated">measurement with the same date and time already exist</string>
 
     <string name="info_enter_user_name">Enter your name</string>
     <string name="info_no_selected_user">No user exists. Please create a new user in the settings.</string>