例如,有一个名为setPicture的方法,它接收位图作为参数.那么,如何在画布上绘制这个位图呢？

请参阅以下代码：

public class TouchView extends View {
 
 final int MIN_WIDTH = 75;
 final int MIN_HEIGHT = 75;
 final int DEFAULT_COLOR = Color.RED;
 int _color;
 final int STROKE_WIDTH = 2;
 
private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
private float x,y;
private boolean touching = false;
 
public TouchView(Context context,AttributeSet attrs,int defStyle) {
    super(context,attrs,defStyle);
    // TODO Auto-generated constructor stub
    init();
}
 
public TouchView(Context context,AttributeSet attrs) {
    super(context,attrs);
    // TODO Auto-generated constructor stub
    init();
}
 
public TouchView(Context context) {
    super(context);
    // TODO Auto-generated constructor stub
    init();
}
 
private void init() {
    setMinimumWidth(MIN_WIDTH);
    setMinimumHeight(MIN_HEIGHT);
    _color = DEFAULT_COLOR;
}
 
@Override
protected void onMeasure(int widthMeasureSpec,int heightMeasureSpec) {
    // TODO Auto-generated method stub
    setMeasuredDimension(MeasureSpec.getSize(widthMeasureSpec),MeasureSpec.getSize(heightMeasureSpec));
}
 
@Override
protected void onDraw(Canvas canvas) {
    // TODO Auto-generated method stub
    super.onDraw(canvas);
 
    if (touching) {
        paint.setStrokeWidth(STROKE_WIDTH);
        paint.setColor(_color);
        paint.setStyle(Paint.Style.FILL);
        canvas.drawCircle(x,y,75f,paint);
    }
}
 
public void setPicture (Bitmap bitmap) {
 
        ///////
         This method must receive my bitmap to draw it on canvas!!!!!!!!!!!!!!!
        ///////
 
 
}
 
public void setColor(int color) {
    _color = color;
}
 
@Override
public boolean onTouchEvent(MotionEvent motionEvent) {
    // TODO Auto-generated method stub
 
    switch (motionEvent.getAction()) {
    case MotionEvent.ACTION_MOVE:
    case MotionEvent.ACTION_DOWN:
        x = motionEvent.getX();
        y = motionEvent.getY();
        touching = true;
        break;
    default:
        touching = false;
    }
    invalidate();
    return true;
}

}

我应该如何将此位图发送到onDraw？