Android自定義View仿IOS圓盤時間選擇器

public class Ring_Slide2 extends View {
 private static final double RADIAN = 180 / Math.PI;
 private int max_progress; // 設置最大進度
 private int cur_progress; //設置錨點1當前進度
 private int cur_progress2; //設置錨點2進度
 private int bottom_color;//設置底色
 private int circle_color; //設置圓的顏色（錨點）
 private int slide_color; //設置滑動過的顏色
 private float ring_width; //圓環(huán)的寬度
 private double cur_Angle; //當前錨點1旋轉(zhuǎn)角度
 private double cur_Angle2; //當前錨點2的旋轉(zhuǎn)角度
 private float ring_Radius;//圓環(huán)的半徑
 private final int[] arrColorCircle = new int[]{0xFFFFde37, 0xFFFFa400};
 private int main_width; //圓的寬度
 private float mWheelCurX, mWheelCurY; //圓的位置
 private float mWheelCurX2, mWheelCurY2; //圓2的位置
 private Paint circle_Paint; //圓環(huán)的畫筆
 private Paint select_Paint;//選中的畫筆
 private Paint dot1; //圓點1
 private Paint dot2; //圓點2
 private Context context;
 private OnSeekBarChangeListener changeListener,changeListener2;
 public Ring_Slide2(Context context) {
  this(context,null);
 }
 public Ring_Slide2(Context context, AttributeSet attrs) {
  this(context, attrs,0);
 }
 public Ring_Slide2(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  this.context=context;
  initAttrs(attrs,defStyleAttr);
  initPadding();
  //初始化畫筆
  initPaints();
 }
 //初始化屬性
 private void initAttrs(AttributeSet attrs, int defStyle){
  TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.Cricle_slide, defStyle, 0);
  max_progress=typedArray.getInt(R.styleable.Cricle_slide_max_progress,720);
  cur_progress=typedArray.getInt(R.styleable.Cricle_slide_cur_progress,420);
  cur_progress2=typedArray.getInt(R.styleable.Cricle_slide_cur_progress2,540);
  if (cur_progress > max_progress) cur_progress = max_progress;
  if (cur_progress2 > max_progress) cur_progress2 = max_progress;
  Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), R.mipmap.select_sun_bg2);
  main_width= bitmap.getWidth();
  ring_width=typedArray.getFloat(R.styleable.Cricle_slide_Ring_Width,main_width);
  bottom_color=typedArray.getColor(R.styleable.Cricle_slide_bottom_color,getColor(R.color.select_main_bg_color));
  circle_color=typedArray.getColor(R.styleable.Cricle_slide_circle_color,getColor(R.color.duration));
  slide_color=typedArray.getColor(R.styleable.Cricle_slide_slide_color,getColor(R.color.time));
  typedArray.recycle();
 }
 //初始化邊距
 private void initPadding(){
  int paddingLeft = getPaddingLeft();
  int paddingTop = getPaddingTop();
  int paddingRight = getPaddingRight();
  int paddingBottom = getPaddingBottom();
  int paddingStart = 0, paddingEnd = 0;
  if (Build.VERSION.SDK_INT >= 17) {
   paddingStart = getPaddingStart();
   paddingEnd = getPaddingEnd();
  }
  int maxPadding = Math.max(paddingLeft, Math.max(paddingTop,
    Math.max(paddingRight, Math.max(paddingBottom, Math.max(paddingStart, paddingEnd)))));
  setPadding(maxPadding, maxPadding, maxPadding, maxPadding);
 }
 private void initPaints(){
  /*
  圓環(huán)的畫筆
   */
  circle_Paint=new Paint(Paint.ANTI_ALIAS_FLAG);
  circle_Paint.setAntiAlias(true);
  circle_Paint.setColor(bottom_color);
  circle_Paint.setStyle(Paint.Style.STROKE);
  circle_Paint.setStrokeWidth(ring_width);
  /*
  選中區(qū)域的畫筆
   */
  select_Paint=new Paint(Paint.ANTI_ALIAS_FLAG);
  select_Paint.setShader(new SweepGradient(0, 0, arrColorCircle, null));
  /*select_Paint.setColor(circle_color);*/
  select_Paint.setAntiAlias(true);
  select_Paint.setStyle(Paint.Style.STROKE);
  select_Paint.setStrokeWidth(ring_width);
  // 畫錨點
  dot1 = new Paint(Paint.ANTI_ALIAS_FLAG);
  dot1.setColor(circle_color);
  dot1.setAntiAlias(true);
  dot1.setStyle(Paint.Style.FILL);
  // 畫錨點2
  dot2 = new Paint(Paint.ANTI_ALIAS_FLAG);
  dot2.setColor(slide_color);
  dot2.setAntiAlias(true);
  dot2.setStyle(Paint.Style.FILL);
 }
 //獲取寬度
 private float getDimen(int dimenId) {
  return getResources().getDimension(dimenId);
 }
 //獲取顏色
 @TargetApi(Build.VERSION_CODES.M)
 private int getColor(int colorId) {
  final int version = Build.VERSION.SDK_INT;
  if (version >= 23) {
   return getContext().getColor(colorId);
  } else {
   return ContextCompat.getColor(getContext(), colorId);
  }
 }
 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  super.onMeasure(widthMeasureSpec, heightMeasureSpec);
  Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), R.mipmap.setalarm_colock_bg);
  int height = bitmap.getHeight()+main_width*2;
  int width = bitmap.getWidth()+main_width*2;
  int min = Math.min(height, width);
  setMeasuredDimension(min,min);
  initposition();
 }
 private void initposition(){
  //轉(zhuǎn)換為360度
  cur_Angle=(double) cur_progress / max_progress*360.0;
  cur_Angle2=(double)cur_progress2 / max_progress*360.0;
  //計算初始化旋轉(zhuǎn)的角度
  double cos = -Math.cos(Math.toRadians(cur_Angle));
  double cos2 = -Math.cos(Math.toRadians(cur_Angle2));
  //根據(jù)旋轉(zhuǎn)的角度來確定位置
  MakeCurPosition(cos);
  MakeCurPosition2(cos2);
  //確定圓環(huán)的半徑
  ring_Radius=(getMeasuredWidth() - getPaddingLeft() - getPaddingRight() - ring_width) / 2;
 }
 private void MakeCurPosition(double cos){
  //根據(jù)旋轉(zhuǎn)的角度來確定圓的位置
  //確定x點的坐標
  mWheelCurX = calcXLocationInWheel(cur_Angle, cos);
  //確定y點的坐標
  mWheelCurY=calcYLocationInWheel(cos);
 }
 private void MakeCurPosition2(double cos2){
  //根據(jù)旋轉(zhuǎn)的角度來確定圓的位置
  //確定x點的坐標
  mWheelCurX2 = calcXLocationInWheel(cur_Angle2, cos2);
  //確定y點的坐標
  mWheelCurY2=calcYLocationInWheel(cos2);
 }
 //確定x點的坐標
 private float calcXLocationInWheel(double angle,double cos){
  if (angle < 180) {
   return (float) (getMeasuredWidth() / 2 + Math.sqrt(1 - cos * cos) * ring_Radius); //Math.sqrt正平分根 9-3
  } else {
   return (float) (getMeasuredWidth() / 2 - Math.sqrt(1 - cos * cos) * ring_Radius);
  }
 }
 //確定y點的坐標
 private float calcYLocationInWheel(double cos) {
  return getMeasuredWidth() / 2 + ring_Radius * (float) cos;
 }
 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  float left = getPaddingLeft() + ring_width / 2;
  float top = getPaddingTop() + ring_width / 2;
  float right = canvas.getWidth() - getPaddingRight() - ring_width / 2;
  float bottom = canvas.getHeight() - getPaddingBottom() - ring_width / 2;
  float centerX = (left + right) / 2;
  float centerY = (top + bottom) / 2;
  float wheelRadius = (canvas.getWidth() - getPaddingLeft() - getPaddingRight()) / 2 - ring_width / 2;
  canvas.drawCircle(centerX, centerY, wheelRadius, circle_Paint);
  //畫選中區(qū)域
  // canvas.drawArc(new RectF(left, top, right, bottom), (float) (Math.PI * RADIAN + Math.acos(cur_Angle) * RADIAN), (float) (Math.abs(cur_Angle-cur_Angle2)), false, select_Paint);
  Log.i("TAG","第一個的角度="+cur_Angle);
  Log.i("TAG","第一個的角度2="+cur_Angle2);
  float begin=0; //圓弧的起點位置
  float stop=0;
  if(cur_Angle>180 && cur_Angle>cur_Angle2 ){ //180 -- 360
   begin=(float) (-Math.abs(cur_Angle-360)-90);
   stop=(float) Math.abs(Math.abs(cur_Angle-360)+cur_Angle2);
   Log.i("TAG","begin="+begin);
   Log.i("TAG","stop="+stop);
  }else if(cur_Angle>cur_Angle2){
   begin=(float) cur_Angle-90;
   stop=(float)(360-(cur_Angle-cur_Angle2));
  }else {
    begin=(float) cur_Angle-90;
   stop=(float) Math.abs(cur_Angle-cur_Angle2);
  }
  canvas.drawArc(new RectF(left, top, right, bottom), begin,stop, false, select_Paint);
  //畫錨點 畫圓
  canvas.drawCircle(mWheelCurX, mWheelCurY, ring_width/2, dot1);
  //畫錨點 畫圓
  canvas.drawCircle(mWheelCurX2, mWheelCurY2, ring_width/2, dot2);
  Log.i("TAG","錨點1Y"+mWheelCurY+"錨點1X"+mWheelCurX);
  Log.i("TAG","錨點2Y"+mWheelCurY2+"錨點1X"+mWheelCurX2);
 }
 @Override
 public boolean onTouchEvent(MotionEvent event) {
  float x = event.getX();
  float y = event.getY();
  int flag=0;
  //判斷是否觸控到兩個點中的其中某個點
  if(isMovedot2(x,y)){
   flag=2;
  }else if(isMovedot1(x,y)){
   flag=1;
  }
  /* if(isMovedot1(x,y)){
   flag=1;
  }else if(isMovedot2(x,y)){
   flag=2;
  }*/
  if(event.getAction()==MotionEvent.ACTION_MOVE || isMovedot1(x,y) ==true || isMovedot2(x,y)==true ){
   Log.i("TAG","進入X="+x+"進入Y="+y);
   //通過觸摸點算出cos角度值
   float cos = calculateCos(x, y);
   // 通過反三角函數(shù)獲得角度值
   double angle; //獲取滑動的角度
   if (x < getWidth() / 2) { // 滑動超過180度
    angle = Math.PI * RADIAN + Math.acos(cos) * RADIAN; //通過計算得到滑動的角度值
   } else { // 沒有超過180度
    angle = Math.PI * RADIAN - Math.acos(cos) * RADIAN; //PI 周長比直徑 返回弧角度的余弦值
   }
   if(flag==1){
    cur_Angle=angle;
    cur_progress=getSelectedValue(cur_Angle);
    MakeCurPosition(cos);
    if (changeListener != null) {
     changeListener.onChanged(this, cur_progress);
    }
   }else if(flag==2){
    cur_Angle2=angle;
    cur_progress2=getSelectedValue(cur_Angle2);
    MakeCurPosition2(cos);
    if (changeListener2 != null) {
     changeListener2.onChanged(this, cur_progress2);
    }
   }
   invalidate();
   return true;
  }else {
   return super.onTouchEvent(event);
  }
 }
 private boolean isMovedot1(float x,float y){
  float dot1x = Math.abs(mWheelCurX - x);
  float dot1y = Math.abs(mWheelCurY - y);
  if(dot1x<30 && dot1y<30){
   return true;
  }else{
   return false;
  }
 }
 private boolean isMovedot2(float x,float y){
  float dot1x = Math.abs(mWheelCurX2 - x);
  float dot1y = Math.abs(mWheelCurY2 - y);
  if(dot1x<30 && dot1y<30){
   return true;
  }else{
   return false;
  }
 }
 //拿到切斜角的cos值
 private float calculateCos(float x, float y){
  float width = x - getWidth() / 2;
  float height = y - getHeight() / 2;
  float slope = (float) Math.sqrt(width * width + height * height);
  return height / slope;
 }
 private int getSelectedValue(double mCurAngle) { //角度轉(zhuǎn)進度
  return Math.round(max_progress * ((float) mCurAngle / 360)); //四舍五入
 }
 public void setOnSeekBarChangeListener(OnSeekBarChangeListener listener) {
  changeListener = listener;
 }
 public void setOnSeekBarChangeListener2(OnSeekBarChangeListener listener) {
  changeListener2 = listener;
 }
 public void initRadian(int pro1,int pro2){
  this.cur_progress=pro1;
  this.cur_progress2=pro2;
  invalidate();
 }
 public interface OnSeekBarChangeListener {
  void onChanged(Ring_Slide2 seekbar, int curValue);
 }
}

 <declare-styleable name="Cricle_slide">
  //設置最大進度
  <attr name="max_progress" format="integer"></attr>
  //設置當前進度
  <attr name="cur_progress" format="integer"></attr>
  //設置當前進度
  <attr name="cur_progress2" format="integer"></attr>
  //設置底色
  <attr name="bottom_color" format="color"></attr>
  //設置圓的顏色
  <attr name="circle_color" format="color"></attr>
  //設置滑動的顏色
  <attr name="slide_color" format="color"></attr>
  //圓環(huán)的寬度 （dimension是代表尺寸值）
  <attr name="Ring_Width" format="dimension"></attr>
 </declare-styleable>