Android五子棋课程，画出的线有的透明有的不透明，求解

Question

public  WuziqiPanel(Context context, AttributeSet attrs) {     super (context, attrs);     setBackgroundColor( 0x44ff0000 );     init(); } private void  init() {     mPaint .setColor( 0x88000000 );     mPaint .setAntiAlias( true );     mPaint .setDither( true );     mPaint .setStyle(Paint.Style. STROKE );     mWhitePiece = BitmapFactory. decodeResource (getResources(),R.drawable. stone_w2 );     mBlackPiece = BitmapFactory. decodeResource (getResources(),R.drawable. stone_b1 ); }