Android好奇宝宝_番外篇_看脸的世界_06

	public BoWenView(Context context, AttributeSet attrs) {
		super(context, attrs);
		init();
	}

	private void init() {
		// 画笔初始化
		mPaint = new Paint();
		mPaint.setAntiAlias(true);
		// 发送消息，开始动画循环
		mHandler.sendEmptyMessage(0);
	}

	protected void onSizeChanged(int w, int h, int oldw, int oldh) {
		super.onSizeChanged(w, h, oldw, oldh);
		// 计算半径=较长边的1/12加1
		radius = w > h ? w / 12 + 1 : h / 12 + 1;
		// 计算中心坐标
		cX = w / 2;
		cY = h / 2;
		// 初始化环形着色器
		radialGradient = new RadialGradient(w / 2, h / 2, radius, 0X88FFFFFF, 0XAAFFFFFF, TileMode.REPEAT);
		mPaint.setShader(radialGradient);
		// 初始化中心图像的位置
		bitmapRectF = new RectF(cX - radius, cY - radius, cX + radius, cY + radius);
	}

	private Bitmap centerBitmap;

	public void setCenterBitmap(Bitmap bitmap) {
		centerBitmap = bitmap;
		invalidate();
	}

	Handler mHandler = new Handler(new Handler.Callback() {
		@Override
		public boolean handleMessage(Message msg) {
			Log.e("Bowen", "handleMessage");
			if (scale >= 6) {
				scale = 0;
			}
			scale++;
			invalidate();
			mHandler.sendEmptyMessageDelayed(0, 500);
			return false;
		}
	});

	protected void onDraw(Canvas canvas) {
		//画圆，根据sacle来控制大小
		canvas.drawCircle(cX, cY, cX > cY ? cX * scale / 6 : cY * scale / 6, mPaint);
		//有设置图像的话就在中间画出来
		if (centerBitmap != null) {
			canvas.drawBitmap(centerBitmap, null, bitmapRectF, null);
		}
	}

	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		//设置中心图像
		((BoWenView) findViewById(R.id.bowen)).setCenterBitmap(BitmapFactory.decodeResource(getResources(),R.drawable.dun));
	}

	protected void onWindowVisibilityChanged(int visibility) {
		super.onWindowVisibilityChanged(visibility);
		if (visibility == View.GONE) {
			Log.e("Bowen", "Window-GONE");
			mHandler.removeMessages(0);
		} else if (visibility == View.VISIBLE) {
			Log.e("Bowen", "Window-VISIBLE");
			mHandler.sendEmptyMessage(0);
		}
	}

	private void init() {
		// 画笔初始化
		mPaint = new Paint();
		mPaint.setAntiAlias(true);
		// 发送消息，开始动画循环
		//mHandler.sendEmptyMessage(0);
	}

//我就是传说中的
//略...