12/24h preference is read from device instead

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

@@ -117,7 +117,7 @@ public class PickerView extends RelativeLayout {
         hourWheel.picker.setOnValueChangeListenerInScrolling(new NumberPickerView.OnValueChangeListenerInScrolling() {
             @Override
             public void onValueChangeInScrolling(NumberPickerView picker, int oldVal, int newVal) {
-                if(Utils.usesAmPm(locale)){
+                if(Settings.usesAmPm()){
                     String oldValue = hourWheel.getValueAtIndex(oldVal);
                     String newValue = hourWheel.getValueAtIndex(newVal);
                     boolean passingNoonOrMidnight = (oldValue.equals("12") && newValue.equals("11")) || oldValue.equals("11") && newValue.equals("12");

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

@@ -0,0 +1,12 @@
+package com.henninghall.date_picker;
+
+
+import android.text.format.DateFormat;
+
+public class Settings {
+
+    public static boolean usesAmPm (){
+        return !DateFormat.is24HourFormat(DatePickerManager.context);
+    }
+
+}

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

@@ -18,11 +18,6 @@ import java.util.TimeZone;
 
 public class Utils {
 
-    public static boolean usesAmPm(Locale locale) {
-        DateFormat df = DateFormat.getTimeInstance(DateFormat.FULL, locale);
-        return df instanceof SimpleDateFormat && ((SimpleDateFormat) df).toPattern().contains("a");
-    }
-
     public static String printToday(Locale locale) {
         return PrettyTime.of(locale).printToday();
     }

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

@@ -2,6 +2,7 @@ package com.henninghall.date_picker.wheels;
 
 import com.henninghall.date_picker.Mode;
 import com.henninghall.date_picker.PickerView;
+import com.henninghall.date_picker.Settings;
 import com.henninghall.date_picker.Utils;
 import java.util.Calendar;
 import cn.carbswang.android.numberpickerview.library.NumberPickerView;
@@ -34,12 +35,12 @@ public class AmPmWheel extends Wheel {
 
     @Override
     public boolean visible() {
-        return Utils.usesAmPm(pickerView.locale) && pickerView.mode != Mode.date;
+        return Settings.usesAmPm() && pickerView.mode != Mode.date;
     }
 
     @Override
     public String getFormatTemplate() {
-        return Utils.usesAmPm(pickerView.locale) ? " a " : "";
+        return Settings.usesAmPm() ? " a " : "";
     }
 
 }

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

@@ -2,9 +2,11 @@ package com.henninghall.date_picker.wheels;
 
 import com.henninghall.date_picker.Mode;
 import com.henninghall.date_picker.PickerView;
+import com.henninghall.date_picker.Settings;
 import com.henninghall.date_picker.Utils;
 import java.util.Calendar;
 
+
 import cn.carbswang.android.numberpickerview.library.NumberPickerView;
 
 
@@ -16,7 +18,7 @@ public class HourWheel extends Wheel {
 
     @Override
     void init() {
-        int numberOfHours = Utils.usesAmPm(pickerView.locale) ? 12 : 24;
+        int numberOfHours = Settings.usesAmPm() ? 12 : 24;
         Calendar cal = pickerView.getInitialDate();
 
         for(int i=0; i<numberOfHours; i++) {
@@ -36,7 +38,7 @@ public class HourWheel extends Wheel {
 
     @Override
     public String getFormatTemplate() {
-        return Utils.usesAmPm(pickerView.locale) ? "h": "HH";
+        return Settings.usesAmPm() ? "h": "HH";
     }
 
 }