android Canvas绘制文字问题

我能画出图片 但画不出来文字是怎么回事 下面是我的关键代码 大家帮我看一下吧 谢谢了
private Bitmap seven;
private Bitmap background;
private Paint paint;

background=BitmapFactory.decodeResource(this.getResources(), R.drawable.processbackground);
seven=BitmapFactory.decodeResource(this.getResources(), R.drawable.number7);

Paint paint=new Paint();
paint.setTextSize(10);
paint.setColor(Color.GREEN);

Canvas c=new Canvas();
c.drawColor(Color.BLUE);

c.drawBitmap(background, 0, 0, paint);
c.drawBitmap(seven, 50, 300, paint);
//c.drawRect(50, 60, 50, 80, paint);
c.drawText("HelloWord", 50,50, paint);

倒不如把你的完整代码发上来看看

bitmap buffer = bitmap.createbitmap(width, height, bitmap.config.argb_4444);buffer.erasecolor(color.transparent);然后用canvas画这个buffer看看

你把 Canvas c=new Canvas(); 的c 换成 onDraw(Canvas canvas){}参数中的canvas试试。

canvas不是new出来的