Refactor pixel conversions to utility functions

Author: yawnoc

app/src/main/java/io/github/yawnoc/strokeinput/Keyboard.java

@@ -97,13 +97,13 @@ public Keyboard(final Context context, final int layoutResourceId) {
     screenHeight = displayMetrics.heightPixels;
 
     defaultKeyHeightPx =
-      (int) (DEFAULT_KEY_HEIGHT_DP * displayMetrics.density);
+      (int) Valuey.pxFromDp(DEFAULT_KEY_HEIGHT_DP, displayMetrics);
     defaultKeyBorderThicknessPx =
-      (int) (DEFAULT_KEY_BORDER_THICKNESS_DP * displayMetrics.density);
+      (int) Valuey.pxFromDp(DEFAULT_KEY_BORDER_THICKNESS_DP, displayMetrics);
     defaultKeyTextSizePx =
-      (int) (DEFAULT_KEY_TEXT_SIZE_SP * displayMetrics.scaledDensity);
+      (int) Valuey.pxFromSp(DEFAULT_KEY_TEXT_SIZE_SP, displayMetrics);
     defaultKeyPreviewMarginYPx =
-      (int) (DEFAULT_KEY_PREVIEW_MARGIN_Y_DP * displayMetrics.density);
+      (int) Valuey.pxFromDp(DEFAULT_KEY_PREVIEW_MARGIN_Y_DP, displayMetrics);
 
     keyList = new ArrayList<>();
 

app/src/main/java/io/github/yawnoc/utilities/Valuey.java

@@ -21,6 +21,7 @@
 package io.github.yawnoc.utilities;
 
 import android.content.res.TypedArray;
+import android.util.DisplayMetrics;
 import android.util.TypedValue;
 
 public class Valuey {
@@ -38,6 +39,22 @@ public static float clipValueToRange(
     return Math.max(rangeMin, Math.min(rangeMax, value));
   }
 
+  public static float pxFromDp(
+    final float dp,
+    final DisplayMetrics displayMetrics
+  )
+  {
+    return dp * displayMetrics.density;
+  }
+  
+  public static float pxFromSp(
+    final float sp,
+    final DisplayMetrics displayMetrics
+  )
+  {
+    return sp * displayMetrics.scaledDensity;
+  }
+  
   public static int getDimensionOrFraction(
     final TypedArray array,
     final int attributeIndex,