Handle wheels visibility

android/src/main/java/com/henninghall/date_picker/PickerView.java

@@ -47,7 +47,6 @@ public class PickerView extends RelativeLayout {
 
         dateFormat = new SimpleDateFormat(getDateFormatTemplate(), locale);
 
-        ((ViewManager) ampmPicker.getParent()).removeView(ampmPicker);
     }
 
     WheelChangeListener onWheelChangeListener = new WheelChangeListener(){

android/src/main/java/com/henninghall/date_picker/wheels/AmPmWheel.java

@@ -28,6 +28,11 @@ public class AmPmWheel extends Wheel {
         picker.setValue(0);
     }
 
+    @Override
+    boolean visible() {
+        return Utils.usesAmPm(locale);
+    }
+
     @Override
     public String getFormatTemplate() {
         return Utils.usesAmPm(locale) ? "a" : "";

android/src/main/java/com/henninghall/date_picker/wheels/DayWheel.java

@@ -41,6 +41,11 @@ public class DayWheel extends Wheel {
 
     }
 
+    @Override
+    boolean visible() {
+        return true;
+    }
+
     @Override
     public String getFormatTemplate() {
         return "yy EEE d MMM";

android/src/main/java/com/henninghall/date_picker/wheels/HourWheel.java

@@ -28,9 +28,14 @@ public class HourWheel extends Wheel {
         picker.setMaxValue(numberOfHours - 1);
     }
 
+    @Override
+    public boolean visible() {
+        return true;
+    }
+
     @Override
     public String getFormatTemplate() {
-        return Utils.usesAmPm(locale) ? "hh": "HH";
+        return Utils.usesAmPm(locale) ? "h": "HH";
     }
 
 }

android/src/main/java/com/henninghall/date_picker/wheels/MinutesWheel.java

@@ -26,6 +26,11 @@ public class MinutesWheel extends Wheel {
         picker.setMaxValue(59);
     }
 
+    @Override
+    boolean visible() {
+        return true;
+    }
+
     @Override
     public String getFormatTemplate() {
         return "mm";

android/src/main/java/com/henninghall/date_picker/wheels/Wheel.java

@@ -16,6 +16,7 @@ import cn.carbswang.android.numberpickerview.library.NumberPickerView;
 public abstract class Wheel {
 
     abstract void init();
+    abstract boolean visible();
     abstract String getFormatTemplate();
 
     ArrayList<String> values;
@@ -42,7 +43,7 @@ public abstract class Wheel {
     }
 
     public String getValue() {
-        return values.get(picker.getValue());
+        return visible() ? values.get(picker.getValue()) : "";
     }
 
     public void setValue(Date date) {
@@ -57,7 +58,12 @@ public abstract class Wheel {
 
     private void refresh() {
         this.format = new SimpleDateFormat(getFormatTemplate(), locale);
-        init();
+        if (visible()) init();
+        else remove();
+    }
+
+    private void remove() {
+        ((ViewManager) picker.getParent()).removeView(picker);
     }
 
 }