Page indicator now uses an outline instead of overlapping shadows

app/src/main/java/eu/kanade/tachiyomi/ui/reader/PageIndicatorTextView.kt

@@ -1,17 +1,54 @@
 package eu.kanade.tachiyomi.ui.reader
 
+import android.annotation.SuppressLint
 import android.content.Context
 import android.graphics.Canvas
+import android.graphics.Color
+import android.graphics.Paint
 import android.support.v7.widget.AppCompatTextView
+import android.text.Spannable
+import android.text.SpannableString
+import android.text.style.ScaleXSpan
 import android.util.AttributeSet
+import android.widget.TextView
 
 class PageIndicatorTextView(context: Context, attrs: AttributeSet? = null) :
         AppCompatTextView(context, attrs) {
 
     override fun onDraw(canvas: Canvas) {
-        // We want the shadow to look like an outline
-        for (i in 0..5) {
-            super.onDraw(canvas)
+        val textColor = textColors.defaultColor
+        textColorField.set(this, Color.BLACK)
+        paint.strokeWidth = 4f
+        paint.style = Paint.Style.STROKE
+        super.onDraw(canvas)
+
+        textColorField.set(this, textColor)
+        paint.strokeWidth = 0f
+        paint.style = Paint.Style.FILL
+        super.onDraw(canvas)
+    }
+
+    @SuppressLint("SetTextI18n")
+    override fun setText(text: CharSequence?, type: BufferType?) {
+        // Add spaces at the start & end of the text, otherwise the stroke is cut-off because it's
+        // not taken into account when measuring the text (view's padding doesn't help).
+        val currText = " $text "
+
+        // Also add a bit of spacing between each character, as the stroke overlaps them
+        val finalText = SpannableString(currText.asIterable().joinToString("\u00A0"))
+
+        for (i in 1..finalText.lastIndex step 2) {
+            finalText.setSpan(ScaleXSpan(0.1f), i, i + 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
         }
+
+        super.setText(finalText, TextView.BufferType.SPANNABLE)
+    }
+
+    private companion object {
+        // We need to use reflection to set the text color instead of using [setTextColor],
+        // otherwise the view is invalidated inside [onDraw] and there's an infinite loop
+        val textColorField = TextView::class.java.getDeclaredField("mCurTextColor").apply {
+            isAccessible = true
+        }!!
     }
 }