/＊ 聲明Paint對象 ＊/
private Paint mPaint   = null;
public CanvasCH(Context context)
{
    super(context);
    /＊ 構(gòu)建對象 ＊/
    mPaint = new Paint();
    /＊ 開啟線程 ＊/
    new Thread(this).start();
}
public void onDraw(Canvas canvas)
{
    super.onDraw(canvas);
    /＊ 設(shè)置畫布的顏色 ＊/
    canvas.drawColor(Color.BLACK);
    /＊ 設(shè)置取消鋸齒效果 ＊/
    mPaint.setAntiAlias(true);
    /＊ 設(shè)置裁剪區(qū)域 ＊/
    canvas.clipRect(10, 10, 280, 260);
    /＊ 首先鎖定畫布 ＊/
    canvas.save();
    /＊ 旋轉(zhuǎn)畫布 ＊/
    canvas.rotate(45.0f);
    /＊ 設(shè)置顏色及繪制矩形 ＊/
    mPaint.setColor(Color.RED);
    canvas.drawRect(new Rect(15,15,140,70), mPaint);
    /＊ 解除畫布的鎖定＊/
    canvas.restore();
    /＊ 設(shè)置顏色及繪制另一個(gè)矩形 ＊/
    mPaint.setColor(Color.GREEN);
    canvas.drawRect(new Rect(150,75,260,120), mPaint);
}
//觸筆事件
public boolean onTouchEvent(MotionEvent event)
{
    return true;
}
//按鍵按下事件
public boolean onKeyDown(int keyCode, KeyEvent event)
{
    return true;
  }
  //按鍵彈起事件
  public boolean onKeyUp(int keyCode, KeyEvent event)
  {
    return false;
  }
  public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event)
  {
    return true;
  }
  public void run()
  {
    while (!Thread.currentThread().isInterrupted())
    {
        try
        {
            Thread.sleep(100);
        }
        catch (InterruptedException e)
        {
            Thread.currentThread().interrupt();
        }
        // 使用postInvalidate可以直接在線程中更新界面
        postInvalidate();
    }
  }
}