BlockBitmapを生成してみよう。

galapagos.js

createBlockBitmap=function(a,b,c){
  const bitmap=android.graphics.Bitmap.createBitmap(128,128, android.graphics.Bitmap.Config.ARGB_4444);
  const canvas=new android.graphics.Canvas(bitmap);
  const paint=new android.graphics.Paint();
  const matrix=new android.graphics.Matrix();
  matrix.postSkew(0.28,0.28);
  matrix.postRotate(-45);
  matrix.postTranslate(6,32);
  canvas.drawBitmap(android.graphics.Bitmap.createScaledBitmap(a,64,64,false),matrix,paint);
  if(!a.isRecycled())
    a.recycle();
  matrix.reset();
  matrix.postSkew(0,0.55);
  matrix.postTranslate(6,32);
  canvas.drawBitmap(android.graphics.Bitmap.createScaledBitmap(b,59,64,false),matrix,paint);
  if(!b.isRecycled())
    b.recycle();
  matrix.reset();
  matrix.postSkew(0,-0.55);
  matrix.postTranslate(65,63);
  canvas.drawBitmap(android.graphics.Bitmap.createScaledBitmap(c,57,64,false),matrix,paint);
  if(!c.isRecycled())
    c.recycle();
  return bitmap;
};

あとは簡単

Bitmapを 上面 横面 横面 の順で渡してあげるだけ。