Android 自定义view的简单应用（3） 时钟
16lz
2021-01-23
先上效果图：
布局文件：
<?xml version="1.0" encoding="utf-8"?> 自定义View 文件：
public class Clock extends View { int width = 800; int height = 800; public Clock(Context context, @Nullable AttributeSet attrs) { super(context, attrs); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); setMeasuredDimension(width,height); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.drawColor(Color.TRANSPARENT); /* 绘制原盘 */ Paint CircleBgPaint = new Paint(); CircleBgPaint.setColor(Color.WHITE); CircleBgPaint.setStyle(Paint.Style.FILL); CircleBgPaint.setAntiAlias(true); int Radius = width / 2 - 60; canvas.drawCircle(width /2 ,height / 2,Radius,CircleBgPaint); /* 绘制原盘边框 */ Paint CircleBgStrkoePaint = new Paint(); CircleBgStrkoePaint.setColor(Color.BLACK); CircleBgStrkoePaint.setStrokeWidth(20); CircleBgStrkoePaint.setStyle(Paint.Style.STROKE); CircleBgStrkoePaint.setAntiAlias(true); canvas.drawCircle(width /2 ,height / 2,Radius,CircleBgStrkoePaint); /* 绘制刻度 分2个数组 因为drawLines 的大小限制 */ Paint MarkPaint = new Paint(); MarkPaint.setColor(Color.BLACK); MarkPaint.setStyle(Paint.Style.FILL); MarkPaint.setAntiAlias(true); MarkPaint.setStrokeWidth(20); int R1 = Radius - 35; int CenterX = width / 2; int CenterY = height / 2; float[] Marks = new float[7 * 4]; float[] Marks2 = new float[5 * 4]; for(int i = 0; i < 12;i++) { if(i <= 3) { int degree = i * 30; int x_s = (int) (Math.sin(Math.toRadians(degree)) * R1); int y_s = (int) (Math.cos(Math.toRadians(degree)) * R1); int x_e = (int) (Math.sin(Math.toRadians(degree)) * Radius); int y_e = (int) (Math.cos(Math.toRadians(degree)) * Radius); Marks[i * 4] = CenterX + x_s; Marks[i * 4 + 1] = CenterY - y_s; Marks[i * 4 + 2] = CenterX + x_e; Marks[i * 4 + 3] = CenterY - y_e; } else if(i <= 6) { int degree = (i - 3) * 30; int y_s = (int) (Math.sin(Math.toRadians(degree)) * R1); int x_s = (int) (Math.cos(Math.toRadians(degree)) * R1); int y_e = (int) (Math.sin(Math.toRadians(degree)) * Radius); int x_e = (int) (Math.cos(Math.toRadians(degree)) * Radius); Marks[i * 4] = CenterX + x_s; Marks[i * 4 + 1] = CenterY + y_s; Marks[i * 4 + 2] = CenterX + x_e; Marks[i * 4 + 3] = CenterY + y_e; } else if(i <= 9) { int degree = (i - 6) * 30; int x_s = (int) (Math.sin(Math.toRadians(degree)) * R1); int y_s = (int) (Math.cos(Math.toRadians(degree)) * R1); int x_e = (int) (Math.sin(Math.toRadians(degree)) * Radius); int y_e = (int) (Math.cos(Math.toRadians(degree)) * Radius); Marks2[( i - 7 ) * 4] = CenterX - x_s; Marks2[( i - 7 ) * 4 + 1] = CenterY + y_s; Marks2[( i - 7 ) * 4 + 2] = CenterX - x_e; Marks2[( i - 7 ) * 4 + 3] = CenterY + y_e; } else if(i <= 11) { int degree = (i - 9) * 30; int y_s = (int) (Math.sin(Math.toRadians(degree)) * R1); int x_s = (int) (Math.cos(Math.toRadians(degree)) * R1); int y_e = (int) (Math.sin(Math.toRadians(degree)) * Radius); int x_e = (int) (Math.cos(Math.toRadians(degree)) * Radius); Marks2[( i - 7 ) * 4] = CenterX - x_s; Marks2[( i - 7 ) * 4 + 1] = CenterY - y_s; Marks2[( i - 7 ) * 4 + 2] = CenterX - x_e; Marks2[( i - 7 ) * 4 + 3] = CenterY - y_e; } } canvas.drawLines(Marks,MarkPaint); canvas.drawLines(Marks2,MarkPaint); Paint TextPaint = new Paint(); TextPaint.setAntiAlias(true); TextPaint.setTextAlign(Paint.Align.CENTER); TextPaint.setTextSize(60); TextPaint.setColor(Color.BLACK); for(int i = 0 ;i < 12;i++) { int degree = i * 30; int x_s = (int) (Math.sin(Math.toRadians(degree)) * ( R1 - 50 )); int y_s = (int) (Math.cos(Math.toRadians(degree)) * ( R1 - 50 )); String str = ""; if(i == 0) { str = "12"; } else{ str = String.valueOf(i); } Paint.FontMetrics fm = TextPaint.getFontMetrics(); canvas.drawText(str,CenterX + x_s,CenterY - y_s + (fm.descent - fm.ascent) / 2 - fm.descent,TextPaint); } /* 获取当前时间 */ long time = System.currentTimeMillis(); SimpleDateFormat format = new SimpleDateFormat("HH-mm-ss"); String str = format.format(time); String[] Hour_Min_Second = str.split("-"); Paint drawPaint = new Paint(); drawPaint.setColor(Color.BLACK); drawPaint.setStyle(Paint.Style.FILL); /* 计算针的角度 */ int hour = Integer.valueOf(Hour_Min_Second[0]) % 12; int min = Integer.valueOf(Hour_Min_Second[1]) % 60; int second = Integer.valueOf(Hour_Min_Second[2]) % 60; float degree_Hour = hour * 30 + min * 0.5f; float degree_Min = min * 360 / 60; float degree_Second = second * 360 / 60; /* 时针 */ canvas.rotate(degree_Hour,width/2,height/2); canvas.drawRect(width / 2 - 10,height / 2 - R1 / 2,width / 2 + 10,height / 2 + 40,drawPaint); /* 分针 */ canvas.rotate(360 - degree_Hour,width/2,height/2); canvas.rotate(degree_Min,width/2,height/2); canvas.drawRect(width / 2 - 10,height / 2 - R1 + 80,width / 2 + 10,height / 2 + 40,drawPaint); /* 秒针 */ drawPaint.setColor(Color.RED); canvas.rotate(360 - degree_Min,width/2,height/2); canvas.rotate(degree_Second,width/2,height/2); canvas.drawRect(width / 2 - 5,height / 2 - R1 + 40,width / 2 + 5,height / 2 + 50,drawPaint); invalidate(); }}
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