Fix InputContainer background not transparent

Author: yawnoc

CHANGELOG.md

@@ -6,6 +6,7 @@
 - Updated keyboard font to [Stroke Input Keyboard v1.3.1]
   (adds glyphs for qwerty symbols etc.)
 - Reduced key label font sizes
+- Fixed InputContainer background not transparent
 
 
 ## [v0.5.0] Implemented qwerty (2021-07-12)

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

@@ -23,6 +23,7 @@
 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.graphics.Canvas;
+import android.graphics.Color;
 import android.graphics.Paint;
 import android.graphics.Rect;
 import android.os.Handler;
@@ -120,6 +121,8 @@ public void handleMessage(Message message) {
         }
       };
 
+    this.setBackgroundColor(Color.TRANSPARENT);
+    
     keyRectangle = new Rect();
 
     keyFillPaint = new Paint(Paint.ANTI_ALIAS_FLAG);