Android时钟效果
仙气儿飘飘w 人气:0自定义时钟
初学自定义View,先画一个不太成熟的时钟(甚至只有秒针)
时钟效果
@SuppressLint("DrawAllocation") public class ClockView extends View { private final Context mContext; private Canvas mCanvas;// 画布 private Paint clockPaint;// 表盘画笔 private Paint textPaint;// 文字画笔 private Paint secondPaint;// 秒针画笔 private int x,y;// 表中心坐标 private Thread refreshThread; private boolean isStop = false; // 用于获取当前秒数 private Date currentDate; private SimpleDateFormat sp = new SimpleDateFormat("ss"); @SuppressLint("HandlerLeak") private final Handler mHandler = new Handler(){ @Override public void handleMessage(@NonNull Message msg) { super.handleMessage(msg); if(msg.what == 0){ invalidate();//每隔一秒刷新一次 } } }; public ClockView(Context context) { this(context,null); } public ClockView(Context context, @Nullable AttributeSet attrs) { this(context,null,0); } public ClockView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { this(context,null,0,0); } public ClockView(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); this.mContext = context; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int widthMeasure; // 设置宽高一致 if(widthMeasureSpec > heightMeasureSpec){ super.onMeasure(heightMeasureSpec, heightMeasureSpec); widthMeasure = getMeasuredHeight(); }else{ super.onMeasure(widthMeasureSpec, widthMeasureSpec); widthMeasure = getMeasuredWidth(); } initPaint(widthMeasure); } private void initPaint(int width){ // 表盘画笔 clockPaint = new Paint(); clockPaint.setColor(mContext.getColor(R.color.black));// 颜色 clockPaint.setAntiAlias(true);// 抗锯齿 clockPaint.setStyle(Paint.Style.STROKE);// 样式 clockPaint.setStrokeWidth(width/80f);// 宽度 //字体画笔 textPaint = new Paint(); textPaint.setColor(mContext.getColor(R.color.black)); textPaint.setAntiAlias(true); textPaint.setStyle(Paint.Style.FILL); textPaint.setTextSize(width/16f); textPaint.setTextAlign(Paint.Align.CENTER); // 秒针画笔 secondPaint = new Paint(); secondPaint.setColor(mContext.getColor(R.color.red)); secondPaint.setAntiAlias(true); secondPaint.setStyle(Paint.Style.FILL); secondPaint.setStrokeWidth(5f); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); mCanvas = canvas; // 获取画布中心坐标 x = getWidth() / 2; y = getHeight() / 2; // 绘制表盘 mCanvas.drawCircle(x, y,getWidth()/40f, clockPaint);// 表盘中心 mCanvas.drawCircle(x, y, x -getWidth()/40f, clockPaint);// 表盘边框 // 绘制刻度 for(int i = 1;i <= 60;i++){ mCanvas.rotate(6, x, y); if(i%5 == 0){ // 绘制大刻度 mCanvas.drawLine(x, getWidth()*3/80f, x, getWidth()*5/80f, clockPaint); }else{ // 绘制小刻度 mCanvas.drawLine(x, getWidth()*3/80f, x, getWidth()/20f, clockPaint); } } // 绘制 1-12小时 字体 for(int i = 1;i <= 60;i++){ if(i%5 == 0){ float x1 = (float) Math.sin(Math.toRadians(6 * i)) * (y * 3 / 4f) + x; float y1 = y - (float) Math.cos(Math.toRadians(6 * i)) * (y * 3 / 4f) + getWidth()/40f; mCanvas.drawText(String.valueOf(i/5), x1, y1, textPaint); } } // 绘制秒针 currentDate = new Date(System.currentTimeMillis()); int ss = Integer.parseInt(sp.format(currentDate));// 获取当前秒数 // 根据当前秒数 计算出秒针的 start 及 end 坐标 float sin = (float) Math.sin(Math.toRadians(6 * ss)); float cos = (float) Math.cos(Math.toRadians(6 * ss)); float x0 = x - sin * (y / 10f); float y0 = y + cos * (y / 10f); float x1 = x + sin * (y * 13 / 20f); float y1 = y - cos * (y * 13 / 20f); mCanvas.drawLine(x0, y0, x1, y1, secondPaint); mCanvas.drawCircle(x, y,getWidth()/80f, secondPaint); } @Override protected void onAttachedToWindow() { super.onAttachedToWindow(); refreshThread = new Thread(){ @Override public void run() { super.run(); while (!isStop){ SystemClock.sleep(1000); mHandler.sendEmptyMessage(0); } } }; refreshThread.start(); } @Override protected void onDetachedFromWindow() { super.onDetachedFromWindow(); mHandler.removeCallbacksAndMessages(null); isStop = true; }
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