Android自定义View实现地铁显示牌效果

Android 前端之家
前端之家收集整理的这篇文章主要介绍了Android自定义View实现地铁显示牌效果，前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。

本文实例为大家分享了Android地铁显示牌的具体代码，供大家参考，具体内容如下

预览效果

Android自定义View实现地铁显示牌效果


目录

SubwayBoardView.java

代码

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<String> noStationStrs = new ArrayList<>();
 private List<String> 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,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,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,width,height,bgPaint);

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

  //中间圆
  canvas.drawCircle(centerX,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 < noStationStrs.size(); i++) {
   canvas.drawPath(getStationView(stationStart + (stationWidth + stationPadding) * i,stationWidth,centerLineB),noStationPaint);

   //保存画布
   canvas.save();
   String stationStr = noStationStrs.get(i);
   Paint.FontMetrics fm = stationTextPaint.getFontMetrics();
   //文字高度
   float fontHeight = (fm.bottom - fm.top) * stationStr.length();
   //显示高度
   float showHeigth = centerLineB - centerLineT;
   //移动画布
   canvas.translate(stationStart + (stationWidth + stationPadding) * i + stationWidth / 3,centerLineT + (showHeigth - fontHeight) / 2);
   float strWidth = stationTextPaint.measureText(stationStr) / stationStr.length();
   StaticLayout staticLayout;
   if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    staticLayout = StaticLayout.Builder.obtain(stationStr,stationStr.length(),(int) strWidth).build();
   } else {
    staticLayout = new StaticLayout(stationStr,(int) strWidth,Layout.Alignment.ALIGN_CENTER,1,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 < stationStrs.size(); i++) {
   canvas.drawPath(getStationView(stationEnd - (stationWidth + stationPadding) * i,stationPaint);

   //保存画布
   canvas.save();
   String stationStr = noStationStrs.get(i);
   Paint.FontMetrics fm = stationTextPaint.getFontMetrics();
   //文字高度
   float fontHeight = (fm.bottom - fm.top) * stationStr.length();
   //显示高度
   float showHeigth = centerLineB - centerLineT;
   //移动画布
   canvas.translate(stationEnd - (stationWidth + stationPadding) * i + stationWidth / 3,-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,curentStr.length(),(int) (fontwidth * 3)).build();
  } else {
   staticLayout = new StaticLayout(curentStr,(int) (fontwidth * 3),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,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);
 }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。

原文链接：https://www.f2er.com/android/534596.html
Android

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