Save/restore state when user e.g. rotates the screen

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

@@ -135,6 +135,24 @@ public class DataEntryActivity extends Activity {
         updateOnView();
     }
 
+    @Override
+    protected void onRestoreInstanceState(Bundle savedInstanceState) {
+        super.onRestoreInstanceState(savedInstanceState);
+
+        for (MeasurementView measurement : dataEntryMeasurements) {
+            measurement.restoreState(savedInstanceState);
+        }
+    }
+
+    @Override
+    protected void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+
+        for (MeasurementView measurement : dataEntryMeasurements) {
+            measurement.saveState(outState);
+        }
+    }
+
     private void updateOnView()
     {
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);

android_app/app/src/main/java/com/health/openscale/gui/views/CommentMeasurementView.java

@@ -17,6 +17,7 @@ package com.health.openscale.gui.views;
 
 import android.content.Context;
 import android.content.SharedPreferences;
+import android.os.Bundle;
 import android.support.v4.content.ContextCompat;
 import android.text.InputType;
 import android.widget.EditText;
@@ -26,6 +27,7 @@ import com.health.openscale.core.datatypes.ScaleMeasurement;
 
 public class CommentMeasurementView extends MeasurementView {
     private String comment;
+    static private String COMMENT_KEY = "comment";
 
     public CommentMeasurementView(Context context) {
         super(context, context.getResources().getString(R.string.label_comment), ContextCompat.getDrawable(context, R.drawable.ic_comment));
@@ -48,6 +50,16 @@ public class CommentMeasurementView extends MeasurementView {
         measurement.setComment(comment);
     }
 
+    @Override
+    public void restoreState(Bundle state) {
+        setValue(state.getString(COMMENT_KEY), true);
+    }
+
+    @Override
+    public void saveState(Bundle state) {
+        state.putString(COMMENT_KEY, comment);
+    }
+
     @Override
     public void updatePreferences(SharedPreferences preferences) {
         // Empty

android_app/app/src/main/java/com/health/openscale/gui/views/DateMeasurementView.java

@@ -19,6 +19,7 @@ import android.app.AlertDialog;
 import android.app.DatePickerDialog;
 import android.content.Context;
 import android.content.SharedPreferences;
+import android.os.Bundle;
 import android.support.v4.content.ContextCompat;
 import android.widget.DatePicker;
 import android.widget.EditText;
@@ -33,6 +34,7 @@ import java.util.Date;
 public class DateMeasurementView extends MeasurementView {
     private static DateFormat dateFormat = DateFormat.getDateInstance();
     private Date date;
+    static private String DATE_KEY = "date";
 
     public DateMeasurementView(Context context) {
         super(context, context.getResources().getString(R.string.label_date), ContextCompat.getDrawable(context, R.drawable.ic_lastmonth));
@@ -64,6 +66,16 @@ public class DateMeasurementView extends MeasurementView {
         measurement.setDateTime(target.getTime());
     }
 
+    @Override
+    public void restoreState(Bundle state) {
+        setValue(new Date(state.getLong(DATE_KEY)), true);
+    }
+
+    @Override
+    public void saveState(Bundle state) {
+        state.putLong(DATE_KEY, date.getTime());
+    }
+
     @Override
     public void updatePreferences(SharedPreferences preferences) {
         // Empty

android_app/app/src/main/java/com/health/openscale/gui/views/FloatMeasurementView.java

@@ -19,6 +19,7 @@ package com.health.openscale.gui.views;
 import android.content.Context;
 import android.graphics.Color;
 import android.graphics.drawable.Drawable;
+import android.os.Bundle;
 import android.os.Handler;
 import android.text.InputType;
 import android.text.SpannableStringBuilder;
@@ -228,6 +229,16 @@ public abstract class FloatMeasurementView extends MeasurementView {
         }
     }
 
+    @Override
+    public void restoreState(Bundle state) {
+        setValue(state.getFloat(nameText), previousValue, true);
+    }
+
+    @Override
+    public void saveState(Bundle state) {
+        state.putFloat(nameText, value);
+    }
+
     @Override
     public String getValueAsString() {
         if (useAutoValue()) {

android_app/app/src/main/java/com/health/openscale/gui/views/MeasurementView.java

@@ -21,6 +21,7 @@ import android.content.DialogInterface;
 import android.content.SharedPreferences;
 import android.graphics.Color;
 import android.graphics.drawable.Drawable;
+import android.os.Bundle;
 import android.support.v4.content.ContextCompat;
 import android.util.TypedValue;
 import android.view.Gravity;
@@ -151,6 +152,9 @@ public abstract class MeasurementView extends TableLayout {
     public abstract void loadFrom(ScaleMeasurement measurement, ScaleMeasurement previousMeasurement);
     public abstract void saveTo(ScaleMeasurement measurement);
 
+    public abstract void restoreState(Bundle state);
+    public abstract void saveState(Bundle state);
+
     public abstract void updatePreferences(SharedPreferences preferences);
 
     public abstract String getValueAsString();

android_app/app/src/main/java/com/health/openscale/gui/views/TimeMeasurementView.java

@@ -19,6 +19,7 @@ import android.app.AlertDialog;
 import android.app.TimePickerDialog;
 import android.content.Context;
 import android.content.SharedPreferences;
+import android.os.Bundle;
 import android.support.v4.content.ContextCompat;
 import android.widget.EditText;
 import android.widget.TimePicker;
@@ -33,6 +34,7 @@ import java.util.Date;
 public class TimeMeasurementView extends MeasurementView {
     private DateFormat timeFormat;
     private Date time;
+    static private String TIME_KEY = "time";
 
     public TimeMeasurementView(Context context) {
         super(context, context.getResources().getString(R.string.label_time), ContextCompat.getDrawable(context, R.drawable.ic_daysleft));
@@ -67,6 +69,16 @@ public class TimeMeasurementView extends MeasurementView {
         measurement.setDateTime(target.getTime());
     }
 
+    @Override
+    public void restoreState(Bundle state) {
+        setValue(new Date(state.getLong(TIME_KEY)), true);
+    }
+
+    @Override
+    public void saveState(Bundle state) {
+        state.putLong(TIME_KEY, time.getTime());
+    }
+
     @Override
     public void updatePreferences(SharedPreferences preferences) {
         // Empty