Android 有数据，但就是没有 Draw 出来，怎么办

如题， debug 下是有数据的， onDraw 有运行，但就是没画出来
public class Arkanoid extends View {
private  int defaultSize;
private int color;
private Paint mPaint;
static private List<Brick> mBrick = new ArrayList<Brick>();

public Arkanoid(Context context, AttributeSet attrs)
{
    this(context, attrs, 0);
}

public Arkanoid(Context context)
{
    this(context, null);
}

/**
 * 获得我自定义的样式属性
 *
 * @param context
 * @param attrs
 * @param defStyle
 */
public Arkanoid(Context context, AttributeSet attrs, int defStyle)
{
    super(context, attrs, defStyle);
    setWillNotDraw(false);
    TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.Arkanoid, defStyle, 0);
    int n = a.getIndexCount();
    for (int i = 0; i < n; i++)
    {
        int attr = a.getIndex(i);
        switch (attr)
        {
            case R.styleable.Arkanoid_aacolor:
                // 默认颜色设置为黑色
                color = a.getColor(attr, Color.BLACK);
                break;
        }

    }
    a.recycle();


    mPaint = new Paint();
    mPaint.setColor(color);
	int value_1 = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 50, getResources().getDisplayMetrics());
    int value_2 = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10, getResources().getDisplayMetrics());
    int value_3 = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 30, getResources().getDisplayMetrics());
    int value_4 = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 3, getResources().getDisplayMetrics());
    int value_5 = 0;
    int value_6 = value_2 + value_4;


  /*    int value_1 =50;
    int value_2 =10;
    int value_3 =30;
    int value_4 =3;
    int value_5 =0;
    int value_6 =13;*/
    for(int i = 0; i < 3 ; ++i){
        for(int j = 0; j < 4; ++j ){
            Brick x = new Brick(value_1, value_5, value_6, value_3, Color.BLACK);
            mBrick.add(x);
            value_5 = value_5 + value_4;
        }
        value_1 = value_1 + value_2;
    }
    this.setOnClickListener(new OnClickListener()
    {

        @Override
        public void onClick(View v)
        {
            Toast.makeText(MainActivity.mainActivity,"d" , Toast.LENGTH_SHORT).show();
        }

    });
}


@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
    // super.onMeasure(widthMeasureSpec, heightMeasureSpec);

    int width = 0;
    int height = 0;

    /**
     * 设置宽度
     */
    int specMode = MeasureSpec.getMode(widthMeasureSpec);
    int specSize = MeasureSpec.getSize(widthMeasureSpec);
    switch (specMode)
    {
        case MeasureSpec.EXACTLY:// 明确指定了
            width = getPaddingLeft() + getPaddingRight() + specSize;
            break;
        case MeasureSpec.AT_MOST:// 一般为 WARP_CONTENT
            width = getPaddingLeft() + getPaddingRight() + (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 1000, getResources().getDisplayMetrics());
            break;
    }

    /**
     * 设置高度
     */
    specMode = MeasureSpec.getMode(heightMeasureSpec);
    specSize = MeasureSpec.getSize(heightMeasureSpec);
    switch (specMode)
    {
        case MeasureSpec.EXACTLY:// 明确指定了
            height = getPaddingTop() + getPaddingBottom() + specSize;
            break;
        case MeasureSpec.AT_MOST:// 一般为 WARP_CONTENT
            height = getPaddingTop() + getPaddingBottom() + (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 140, getResources().getDisplayMetrics());
            break;
    }

    setMeasuredDimension(width, height);

}

@Override
protected void onDraw(Canvas canvas)
{

    for(Iterator iter = mBrick.iterator(); iter.hasNext();){
        Brick q = (Brick) iter.next();
		canvas.drawRect(q.x, q.y, q.width, q.height, mPaint);
    }
    //canvas.drawRect( 0, 0 ,500,500, mPaint);
}

class Brick{
	public int x;
	public int y;
	public int width;
	public int height;
	public int color;

	public Brick(int x,int y, int width, int height, int color){
		this.x = x;
		this.y = y;
		this.width = width;
		this.height = height;
		this.color = color;
	}
}
}