绘制正弦曲线

2. 绘图板 private void draws() { try { mCanvas = mHolder.lockCanvas(); // Surface背景 mCanvas.drawColor(Color.WHITE); mCanvas.drawPath(mPath, mPaint); } catch (Exception e) { } finally { if (mCanvas != null) { mHolder.unlockCanvasAndPost(mCanvas); } } } @Override public boolean onTouchEvent(MotionEvent event) { int x = (int) event.getX(); int y = (int) event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mPath.moveTo(x,y); break; case MotionEvent.ACTION_MOVE: mPath.lineTo(x, y); break; case MotionEvent.ACTION_UP: break; } return true; }

画笔粗细没调。。