Created TimeTextUtils

app/src/main/java/com/philliphsu/clock2/editalarm/NumpadTimePickerDialog.java

@@ -160,7 +160,7 @@ public class NumpadTimePickerDialog extends DialogFragment implements NumpadTime
     }
 
     private void updateInputText(String inputText) {
-        mInputField.setText(inputText);
+        TimeTextUtils.setText(inputText, mInputField);
         // Move the cursor
         mInputField.setSelection(mInputField.length());
         if (mFocusGrabber.isFocused()) {

app/src/main/java/com/philliphsu/clock2/editalarm/TimeTextUtils.java

@@ -0,0 +1,39 @@
+package com.philliphsu.clock2.editalarm;
+
+import android.text.SpannableString;
+import android.text.Spanned;
+import android.text.style.RelativeSizeSpan;
+import android.widget.TextView;
+
+/**
+ * Created by Phillip Hsu on 7/16/2016.
+ *
+ * Utility for accessing the RelativeSizeSpan suitable for changing the
+ * size of the AM/PM label in a TextView.
+ *
+ * TODO: Rename to something like TwelveHourTimeTextUtils
+ */
+public class TimeTextUtils {
+
+    private TimeTextUtils() {}
+
+    public static final RelativeSizeSpan AMPM_SIZE_SPAN = new RelativeSizeSpan(0.5f);
+
+    /**
+     * Sets the given String on the TextView.
+     * If the given String contains the "AM" or "PM" label,
+     * this first applies a size span on the label.
+     * @param textTime the time String that may contain "AM" or "PM"
+     * @param textView the TextView to display {@code textTime}
+     */
+    public static void setText(String textTime, TextView textView) {
+        if (textTime.contains("AM") || textTime.contains("PM")) {
+            SpannableString s = new SpannableString(textTime);
+            s.setSpan(AMPM_SIZE_SPAN, textTime.indexOf(" "), textTime.length(),
+                    Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
+            textView.setText(s, TextView.BufferType.SPANNABLE);
+        } else {
+            textView.setText(textTime);
+        }
+    }
+}