Android自定义View实现地铁显示牌效果

public class SubwayBoardView extends View {

 private Paint bgPaint, tbPaint, centerBgPaint, centerRingPaint, centerCirclePaint, centerCircleRingPaint, noStationPaint, stationPaint, doorPaint;

 private TextPaint centerTextPaint, stationTextPaint, currentStationTextPaint, doorTextPaint;

 private float barHeight = DensityUtil.dp2Px(getContext(), 20);

 private float centerCircleWidth;
 private float centerRingWidth;
 private float centerCircleRingStrokeWidth = DensityUtil.dp2Px(getContext(), 5);
 private float centerRingStrokeWidth = DensityUtil.dp2Px(getContext(), 36);

 private float centerCircleRingSweepAngle = 0f;
 private ObjectAnimator centerCircleRingAnim;

 private List noStatiOnStrs= new ArrayList<>();
 private List statiOnStrs= new ArrayList<>();
 private String currentStatiOnStrs= "杭州站";
 private Bitmap doorBitmap;
 private Camera camera;

 public SubwayBoardView(Context context) {
  super(context);
  initView();
 }

 public SubwayBoardView(Context context, @Nullable AttributeSet attrs) {
  super(context, attrs);
  initView();
 }

 public SubwayBoardView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  initView();
 }

 private void initView() {
  //全背景
  bgPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  bgPaint.setStyle(Paint.Style.FILL);
  bgPaint.setColor(Color.parseColor("#85919a"));

  //上下边栏
  tbPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  tbPaint.setStyle(Paint.Style.FILL);
  tbPaint.setColor(Color.parseColor("#c21b2c"));

  //中间栏
  centerBgPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  centerBgPaint.setStyle(Paint.Style.FILL);
  centerBgPaint.setColor(Color.parseColor("#92a3d1"));

  //中间空白圆环区域
  centerRingPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  centerRingPaint.setStyle(Paint.Style.STROKE);
  centerRingPaint.setStrokeWidth(centerRingStrokeWidth);
  centerRingPaint.setColor(Color.parseColor("#85919a"));

  //中间圆
  centerCirclePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  centerCirclePaint.setStyle(Paint.Style.FILL);
  centerCirclePaint.setColor(Color.parseColor("#c21b2c"));

  //中间圆边上的圆环
  centerCircleRingPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  centerCircleRingPaint.setStyle(Paint.Style.STROKE);
  centerCircleRingPaint.setStrokeWidth(centerCircleRingStrokeWidth);
  centerCircleRingPaint.setStrokeCap(Paint.Cap.ROUND);
  centerCircleRingPaint.setColor(Color.parseColor("#6e8ca6"));

  //中间文字
  centerTextPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
  centerTextPaint.setStyle(Paint.Style.FILL);
  centerTextPaint.setFakeBoldText(true);
  centerTextPaint.setColor(Color.parseColor("#333333"));
  centerTextPaint.setTextAlign(Paint.Align.CENTER);
  centerTextPaint.setShadowLayer(3, 3, 3, Color.parseColor("#6e8ca6"));
  centerTextPaint.setTextSize(DensityUtil.sp2px(getContext(), 24));

  //未到达的站
  noStatiOnPaint= new Paint(Paint.ANTI_ALIAS_FLAG);
  noStationPaint.setStyle(Paint.Style.FILL_AND_STROKE);
  noStationPaint.setColor(Color.parseColor("#c21b2c"));

  //未到站文字
  statiOnTextPaint= new TextPaint(Paint.ANTI_ALIAS_FLAG);
  stationTextPaint.setStyle(Paint.Style.FILL);
  stationTextPaint.setColor(Color.parseColor("#333333"));
  stationTextPaint.setTextAlign(Paint.Align.CENTER);
  stationTextPaint.setShadowLayer(3, 3, 3, Color.parseColor("#6e8ca6"));
  stationTextPaint.setTextSize(DensityUtil.sp2px(getContext(), 18));

  noStationStrs.add("宁波站");
  noStationStrs.add("上虞站");
  noStationStrs.add("绍兴站");

  //已到达的站
  statiOnPaint= new Paint(Paint.ANTI_ALIAS_FLAG);
  stationPaint.setStyle(Paint.Style.FILL_AND_STROKE);
  stationPaint.setColor(Color.parseColor("#7586b2"));

  stationStrs.add("南京站");
  stationStrs.add("苏州站");
  stationStrs.add("上海站");

  //到站文字
  currentStatiOnTextPaint= new TextPaint(Paint.ANTI_ALIAS_FLAG);
  currentStationTextPaint.setStyle(Paint.Style.FILL);
  currentStationTextPaint.setFakeBoldText(true);
  currentStationTextPaint.setColor(Color.parseColor("#3d5d9a"));
  currentStationTextPaint.setTextAlign(Paint.Align.LEFT);
  currentStationTextPaint.setTextSize(DensityUtil.sp2px(getContext(), 18));

  doorPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  doorBitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.open_door);

  doorTextPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
  doorTextPaint.setStyle(Paint.Style.FILL);
  doorTextPaint.setColor(Color.parseColor("#c21b2c"));
  doorTextPaint.setTextAlign(Paint.Align.LEFT);
  doorTextPaint.setTextSize(DensityUtil.sp2px(getContext(), 14));

  camera = new Camera();
 }

 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  int width = getWidth();
  int height = getHeight();

  int centerX = width / 2;
  int centerY = height / 2;

  //计算中间空白圆形宽度
  if (0 == centerRingWidth) {
   centerRingWidth = (height - DensityUtil.dp2Px(getContext(), 12)) * 1f / 2;
  }
  //计算中间圆的半径
  if (0 == centerCircleWidth) {
   centerCircleWidth = centerRingWidth - DensityUtil.dp2Px(getContext(), 8);
  }

  //背景
  canvas.drawRect(0, 0, width, height, bgPaint);

  //上下栏
  canvas.drawRect(0, 0, width, barHeight, tbPaint);
  canvas.drawRect(0, height - barHeight, width, height, tbPaint);

  //中间圆环空白区域
  canvas.drawCircle(centerX, centerY, centerRingWidth, centerRingPaint);

  //中间栏
  float centerLineT = barHeight + DensityUtil.dp2Px(getContext(), 10);
  float centerLineB = height - barHeight - DensityUtil.dp2Px(getContext(), 10);
  canvas.drawRect(0, centerLineT, width, centerLineB, centerBgPaint);

  //中间圆
  canvas.drawCircle(centerX, centerY, centerCircleWidth, centerCirclePaint);

  //中间圆环
  if (centerCircleRingSweepAngle > 0) {
   canvas.drawArc(centerX - centerCircleWidth - (centerCircleRingStrokeWidth / 2), centerY - centerCircleWidth - (centerCircleRingStrokeWidth / 2), centerX + centerCircleWidth + (centerCircleRingStrokeWidth / 2), centerY + centerCircleWidth + (centerCircleRingStrokeWidth / 2), -90f, centerCircleRingSweepAngle, false, centerCircleRingPaint);
  }

  //中间文字
  Paint.FontMetrics fOntMetrics= centerTextPaint.getFontMetrics();
  float dx = (fontMetrics.bottom - fontMetrics.top) / 2 - fontMetrics.bottom;
  canvas.drawText(currentStationStrs, centerX, centerY + dx, centerTextPaint);

  //未到站
  float statiOnStart= DensityUtil.dp2Px(getContext(), 20);
  float statiOnWidth= DensityUtil.dp2Px(getContext(), 40);
  float statiOnPadding= DensityUtil.dp2Px(getContext(), 20);
  for (int i = 0; i = Build.VERSION_CODES.M) {
    staticLayout = StaticLayout.Builder.obtain(stationStr, 0, stationStr.length(), stationTextPaint, (int) strWidth).build();
   } else {
    staticLayout = new StaticLayout(stationStr, stationTextPaint, (int) strWidth, Layout.Alignment.ALIGN_CENTER, 1, 0, true);
   }
   //绘制
   staticLayout.draw(canvas);
   //还原画布
   canvas.translate(-stationStart + (stationWidth + stationPadding) * i, -centerLineT);
   canvas.restore();
  }

  //已过站
  float statiOnEnd= getWidth() - DensityUtil.dp2Px(getContext(), 20) - stationWidth;
  for (int i = 0; i = Build.VERSION_CODES.M) {
    staticLayout = StaticLayout.Builder.obtain(stationStr, 0, stationStr.length(), stationTextPaint, (int) strWidth).build();
   } else {
    staticLayout = new StaticLayout(stationStr, stationTextPaint, (int) strWidth, Layout.Alignment.ALIGN_CENTER, 1, 0, true);
   }
   //绘制
   staticLayout.draw(canvas);
   //还原画布
   canvas.translate(-stationStart + (stationWidth + stationPadding) * i, -centerLineT);
   canvas.restore();
  }

  //到达站
  String curentStr = "停靠站" + currentStationStrs;
  float fOntwidth= stationTextPaint.measureText(curentStr) / curentStr.length();
  float pointX = centerX - centerRingWidth - fontwidth * 3 - DensityUtil.dp2Px(getContext(), 26);
  Paint.FontMetrics fm = stationTextPaint.getFontMetrics();
  float pointY = centerLineT + ((centerLineB - centerLineT) - (fm.bottom - fm.top) * 2) / 2;
  canvas.save();
  canvas.translate(pointX, pointY);
  StaticLayout staticLayout;
  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
   staticLayout = StaticLayout.Builder.obtain(curentStr, 0, curentStr.length(), stationTextPaint, (int) (fontwidth * 3)).build();
  } else {
   staticLayout = new StaticLayout(curentStr, stationTextPaint, (int) (fontwidth * 3), Layout.Alignment.ALIGN_CENTER, 1, 0, true);
  }
  //绘制
  staticLayout.draw(canvas);
  canvas.translate(-pointX, -centerLineT);
  canvas.restore();

  //开门提示
  String primt = "注意开门";
  float doorTextWidth = doorTextPaint.measureText(primt);
  Paint.FontMetrics doorTextFm = doorTextPaint.getFontMetrics();
  float doorTextheight = doorTextFm.bottom - doorTextFm.top;
  float dy = doorTextheight / 2 - doorTextFm.bottom;
  int doorTextLeft = (int) (centerX + centerRingWidth + DensityUtil.dp2Px(getContext(), 26));
  Rect rect = new Rect();
  rect.left = (int) (doorTextLeft + ((doorTextWidth - doorBitmap.getWidth()) / 2));
  rect.top = (int) (centerLineT + ((centerLineB - centerLineT) - (doorBitmap.getHeight() + DensityUtil.dp2Px(getContext(), 6) + + doorTextheight)) / 2);
  rect.right = rect.left + doorBitmap.getWidth();
  rect.bottom = rect.top + doorBitmap.getHeight();
  //旋转
  canvas.save();
  camera.save();
  canvas.translate(rect.left, rect.top);
  camera.rotateY(-45);
  camera.applyToCanvas(canvas);
  canvas.translate(-rect.left, -rect.top);
  camera.restore();
  canvas.drawBitmap(doorBitmap, null, rect, doorPaint);
  canvas.restore();
  canvas.drawText(primt, doorTextLeft, rect.bottom + DensityUtil.dp2Px(getContext(), 6) + (doorTextheight / 2) + dy, doorTextPaint);
 }

 /**
  * 获取站信息
  *
  * @param pl
  * @param width
  * @param centerLineT
  * @param centerLineB
  * @return
  */
 private Path getStationView(float pl, float width, float centerLineT, float centerLineB) {
  float pt = centerLineT;
  float pr = pl + width;
  float pb = centerLineB;
  float r = (pr - pl) / 3;
  Path path = new Path();
  path.moveTo(pl, pt);
  path.lineTo(pr, pt);
  path.quadTo(pr - r, pt + (pb - pt) / 2, pr, pb);
  path.lineTo(pl, pb);
  path.quadTo(pl - r, pt + (pb - pt) / 2, pl, pt);
  path.close();
  return path;
 }

 public void setCenterCircleRingSweepAngle(float centerCircleRingSweepAngle) {
  this.centerCircleRingSweepAngle = centerCircleRingSweepAngle;
  invalidate();
 }

 /**
  * 开始中间圆动画
  */
 public void animCenterCircleRing() {
  if (null == centerCircleRingAnim) {
   centerCircleRingAnim = ObjectAnimator.ofFloat(this, "centerCircleRingSweepAngle", 0f, 360f);
   centerCircleRingAnim.setDuration(3000);
   centerCircleRingAnim.setInterpolator(new LinearInterpolator());
   centerCircleRingAnim.setRepeatCount(ValueAnimator.INFINITE);
   centerCircleRingAnim.setRepeatMode(ValueAnimator.RESTART);
  }
  centerCircleRingAnim.start();
 }

 /**
  * 停止
  */
 public void stopAnimCenterCircleRing() {
  if (null != centerCircleRingAnim) {
   centerCircleRingAnim.cancel();
  }
  setCenterCircleRingSweepAngle(0);
 }
}