Android,시 크 한 CheckBox 효과 구현
 
 gif 의 효 과 는 좀 빠 를 수 있 으 며,실제 기기 에서 운행 하 는 효과 가 더욱 좋 을 것 입 니 다.우리 의 주요 사고방식 은 속성 애니메이션 을 이용 하여 선택 상태 와 체크 하 는 그리 기 과정 을 동적 으로 그 리 는 것 이다.위의 효과 도 를 보면 모두 가 잠시 도 지체 하지 않 고 해 보고 싶 어 할 것 이 라 고 믿 습 니 다.그럼 시작 합 시다.
사용자 정의 View 의 첫 번 째 단계:사용자 정의 속성.
<?xml version="1.0" encoding="utf-8"?>
<resources>
 <declare-styleable name="SmoothCheckBox">
 <!--        -->
 <attr name="duration" format="integer"></attr>
 <!--      -->
 <attr name="strikeWidth" format="dimension|reference"></attr>
 <!--      -->
 <attr name="borderColor" format="color|reference"></attr>
 <!--         -->
 <attr name="trimColor" format="color|reference"></attr>
 <!--      -->
 <attr name="tickColor" format="color|reference"></attr>
 <!--      -->
 <attr name="tickWidth" format="dimension|reference"></attr>
 </declare-styleable>
</resources>다음은 onMeasure(int width MeasureSpec,int height MeasureSpec)를 살 펴 보 겠 습 니 다.
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 super.onMeasure(widthMeasureSpec, heightMeasureSpec);
 int widthSize = MeasureSpec.getSize(widthMeasureSpec);
 int widthMode = MeasureSpec.getMode(widthMeasureSpec);
 if (widthMode == MeasureSpec.EXACTLY) {
  mWidth = widthSize;
 } else {
  mWidth = 40;
 }
 int heightSize = MeasureSpec.getSize(heightMeasureSpec);
 int heightMode = MeasureSpec.getMode(heightMeasureSpec);
 if (heightMode == MeasureSpec.EXACTLY) {
  mHeight = heightSize;
 } else {
  mHeight = 40;
 }
 setMeasuredDimension(mWidth, mHeight);
 int size = Math.min(mWidth, mHeight);
 center = size / 2;
 mRadius = (int) ((size - mStrokeWidth) / 2 / 1.2f);
 startPoint.set(center * 14 / 30, center * 28 / 30);
 breakPoint.set(center * 26 / 30, center * 40 / 30);
 endPoint.set(center * 44 / 30, center * 20 / 30);
 downLength = (float) Math.sqrt(Math.pow(startPoint.x - breakPoint.x, 2f) + Math.pow(startPoint.y - breakPoint.y, 2f));
 upLength = (float) Math.sqrt(Math.pow(endPoint.x - breakPoint.x, 2f) + Math.pow(endPoint.y - breakPoint.y, 2f));
 totalLength = downLength + upLength;
} 
 onDraw(Canvas canvas)를 보기 전에 우 리 는 먼저 두 개의 애니메이션 을 보 았 습 니 다.그것 은 선택 한 상태의 애니메이션 과 선택 하지 않 은 상태의 애니메이션 입 니 다.
//           
private void checkedAnimation() {
 animatedValue = 0f;
 tickValue = 0f;
 //         
 mValueAnimator = ValueAnimator.ofFloat(0f, 1.2f, 1f).setDuration(2 * duration / 5);
 mValueAnimator.setInterpolator(new AccelerateDecelerateInterpolator());
 //      
 mTickValueAnimator = ValueAnimator.ofFloat(0f, 1f).setDuration(3 * duration / 5);
 mTickValueAnimator.setInterpolator(new LinearInterpolator());
 mTickValueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
  @Override
  public void onAnimationUpdate(ValueAnimator valueAnimator) {
 //         
   tickValue = (float) valueAnimator.getAnimatedValue();
   postInvalidate();
  }
 });
 mValueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
  @Override
  public void onAnimationUpdate(ValueAnimator valueAnimator) {
 //         
   animatedValue = (float) valueAnimator.getAnimatedValue();
   postInvalidate();
  }
 });
 mValueAnimator.addListener(new AnimatorListenerAdapter() {
  @Override
  public void onAnimationEnd(Animator animation) {
 //                 
   mTickValueAnimator.start();
   Log.i(TAG," mTickValueAnimator.start();");
  }
 });
 mValueAnimator.start();
}
//           
private void uncheckedAnimation() {
 animatedValue = 0f;
 mValueAnimator = ValueAnimator.ofFloat(1f, 0f).setDuration(2 * duration / 5);
 mValueAnimator.setInterpolator(new AccelerateInterpolator());
 mValueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
  @Override
  public void onAnimationUpdate(ValueAnimator valueAnimator) {
   animatedValue = (float) valueAnimator.getAnimatedValue();
   postInvalidate();
  }
 });
 mValueAnimator.start();
}
@Override
protected void onDraw(Canvas canvas) {
 super.onDraw(canvas);
 canvas.save();
 drawBorder(canvas);
 drawTrim(canvas);
 if (isChecked) {
  drawTick(canvas);
 }
 canvas.restore();
}
//    
private void drawTick(Canvas canvas) {
 //         
 float temp = tickValue * totalLength;
 Log.i(TAG, "temp:" + temp + "downlength :" + downLength);
 //              ,   startPoint
 if (Float.compare(tickValue, 0f) == 0) {
  Log.i(TAG, "startPoint : " + startPoint.x + ", " + startPoint.y);
  path.reset();
  path.moveTo(startPoint.x, startPoint.y);
 }
 //             breakPoint   , (breakPoint,endPoint]
 if (temp > downLength) {
  path.moveTo(startPoint.x, startPoint.y);
  path.lineTo(breakPoint.x, breakPoint.y);
  Log.i(TAG, "endPoint : " + endPoint.x + ", " + endPoint.y);
  path.lineTo((endPoint.x - breakPoint.x) * (temp - downLength) / upLength + breakPoint.x, (endPoint.y - breakPoint.y) * (temp - downLength) / upLength + breakPoint.y);
 } else {
 //        startPoinit breakPoint  , (startPoint,breakPoint]
  Log.i(TAG, "down x : " + (breakPoint.x - startPoint.x) * temp / downLength + ",down y: " + (breakPoint.y - startPoint.y) * temp / downLength);
  path.lineTo((breakPoint.x - startPoint.x) * temp / downLength + startPoint.x, (breakPoint.y - startPoint.y) * temp / downLength + startPoint.y);
 }
 canvas.drawPath(path, tickPaint);
}
//    
private void drawBorder(Canvas canvas) {
 float temp;
 //   animatedValue       “OverShooting”   
 if (animatedValue > 1f) {
  temp = animatedValue * mRadius;
 } else {
  temp = mRadius;
 }
 canvas.drawCircle(center, center, temp, borderPaint);
}
//  checkbox  
private void drawTrim(Canvas canvas) {
 canvas.drawCircle(center, center, (mRadius - mStrokeWidth) * animatedValue, trimPaint);
}다음은 SmoothCheckBox 의 전체 코드 를 붙 입 니 다.
public class SmoothCheckBox extends View implements View.OnClickListener {
 //       
 private long duration;
 //     
 private float mStrokeWidth;
 //     
 private float mTickWidth;
 //     
 private Paint trimPaint;
 //     
 private Paint borderPaint;
 //     
 private Paint tickPaint;
 //       
 private float defaultStrikeWidth;
 //       
 private float defaultTickWidth;
 //   
 private int mWidth;
 //   
 private int mHeight;
 //     
 private int borderColor;
 //     
 private int trimColor;
 //     
 private int tickColor;
 //   
 private int mRadius;
 //    
 private int center;
 //      
 private boolean isChecked;
 //       
 private float downLength;
 //       
 private float upLength;
 //       
 private float totalLength;
 //    
 private OnCheckedChangeListener listener;
 private ValueAnimator mValueAnimator;
 private ValueAnimator mTickValueAnimator;
 private float animatedValue;
 private float tickValue;
 //      
 private Point startPoint = new Point();
 //      
 private Point breakPoint = new Point();
 //      
 private Point endPoint = new Point();
 private static final String TAG = "SmoothCheckBox";
 private static final String KEY_INSTANCE_STATE = "InstanceState";
 private Path path = new Path();
 public void setOnCheckedChangeListener(OnCheckedChangeListener listener) {
  this.listener = listener;
 }
 public SmoothCheckBox(Context context) {
  this(context, null);
 }
 public SmoothCheckBox(Context context, AttributeSet attrs) {
  this(context, attrs, 0);
 }
 public SmoothCheckBox(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.SmoothCheckBox);
  duration = a.getInt(R.styleable.SmoothCheckBox_duration, 600);
  defaultStrikeWidth = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 1, getResources().getDisplayMetrics());
  mStrokeWidth = a.getDimension(R.styleable.SmoothCheckBox_strikeWidth, defaultStrikeWidth);
  defaultTickWidth = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 2, getResources().getDisplayMetrics());
  mTickWidth = a.getDimension(R.styleable.SmoothCheckBox_tickWidth, defaultTickWidth);
  borderColor = a.getColor(R.styleable.SmoothCheckBox_borderColor, getResources().getColor(android.R.color.darker_gray));
  trimColor = a.getColor(R.styleable.SmoothCheckBox_trimColor, getResources().getColor(android.R.color.holo_green_light));
  tickColor = a.getColor(R.styleable.SmoothCheckBox_tickColor, getResources().getColor(android.R.color.white));
  a.recycle();
  trimPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  trimPaint.setStyle(Paint.Style.FILL);
  trimPaint.setColor(trimColor);
  borderPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  borderPaint.setStrokeWidth(mStrokeWidth);
  borderPaint.setColor(borderColor);
  borderPaint.setStyle(Paint.Style.STROKE);
  tickPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  tickPaint.setColor(tickColor);
  tickPaint.setStyle(Paint.Style.STROKE);
  tickPaint.setStrokeCap(Paint.Cap.ROUND);
  tickPaint.setStrokeWidth(mTickWidth);
  setOnClickListener(this);
 }
 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  super.onMeasure(widthMeasureSpec, heightMeasureSpec);
  int widthSize = MeasureSpec.getSize(widthMeasureSpec);
  int widthMode = MeasureSpec.getMode(widthMeasureSpec);
  if (widthMode == MeasureSpec.EXACTLY) {
   mWidth = widthSize;
  } else {
   mWidth = 40;
  }
  int heightSize = MeasureSpec.getSize(heightMeasureSpec);
  int heightMode = MeasureSpec.getMode(heightMeasureSpec);
  if (heightMode == MeasureSpec.EXACTLY) {
   mHeight = heightSize;
  } else {
   mHeight = 40;
  }
  setMeasuredDimension(mWidth, mHeight);
  int size = Math.min(mWidth, mHeight);
  center = size / 2;
  mRadius = (int) ((size - mStrokeWidth) / 2 / 1.2f);
  startPoint.set(center * 14 / 30, center * 28 / 30);
  breakPoint.set(center * 26 / 30, center * 40 / 30);
  endPoint.set(center * 44 / 30, center * 20 / 30);
  downLength = (float) Math.sqrt(Math.pow(startPoint.x - breakPoint.x, 2f) + Math.pow(startPoint.y - breakPoint.y, 2f));
  upLength = (float) Math.sqrt(Math.pow(endPoint.x - breakPoint.x, 2f) + Math.pow(endPoint.y - breakPoint.y, 2f));
  totalLength = downLength + upLength;
 }
 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  canvas.save();
  drawBorder(canvas);
  drawTrim(canvas);
  if (isChecked) {
   drawTick(canvas);
  }
  canvas.restore();
 }
 @Override
 protected Parcelable onSaveInstanceState() {
  Bundle bundle = new Bundle();
  bundle.putParcelable(KEY_INSTANCE_STATE, super.onSaveInstanceState());
  bundle.putBoolean(KEY_INSTANCE_STATE, isChecked);
  return bundle;
 }
 @Override
 protected void onRestoreInstanceState(Parcelable state) {
  if (state instanceof Bundle) {
   Bundle bundle = (Bundle) state;
   boolean isChecked = bundle.getBoolean(KEY_INSTANCE_STATE);
   setChecked(isChecked);
   super.onRestoreInstanceState(bundle.getParcelable(KEY_INSTANCE_STATE));
   return;
  }
  super.onRestoreInstanceState(state);
 }
 //     
 private void toggle() {
  isChecked = !isChecked;
  if (listener != null) {
   listener.onCheckedChanged(this, isChecked);
  }
  if (isChecked) {
   checkedAnimation();
  } else {
   uncheckedAnimation();
  }
 }
 //           
 private void checkedAnimation() {
  animatedValue = 0f;
  tickValue = 0f;
  mValueAnimator = ValueAnimator.ofFloat(0f, 1.2f, 1f).setDuration(2 * duration / 5);
  mValueAnimator.setInterpolator(new AccelerateDecelerateInterpolator());
  mTickValueAnimator = ValueAnimator.ofFloat(0f, 1f).setDuration(3 * duration / 5);
  mTickValueAnimator.setInterpolator(new LinearInterpolator());
  mTickValueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
   @Override
   public void onAnimationUpdate(ValueAnimator valueAnimator) {
    tickValue = (float) valueAnimator.getAnimatedValue();
    postInvalidate();
   }
  });
  mValueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
   @Override
   public void onAnimationUpdate(ValueAnimator valueAnimator) {
    animatedValue = (float) valueAnimator.getAnimatedValue();
    postInvalidate();
   }
  });
  mValueAnimator.addListener(new AnimatorListenerAdapter() {
   @Override
   public void onAnimationEnd(Animator animation) {
    mTickValueAnimator.start();
    Log.i(TAG," mTickValueAnimator.start();");
   }
  });
  mValueAnimator.start();
 }
 //           
 private void uncheckedAnimation() {
  animatedValue = 0f;
  mValueAnimator = ValueAnimator.ofFloat(1f, 0f).setDuration(2 * duration / 5);
  mValueAnimator.setInterpolator(new AccelerateInterpolator());
  mValueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
   @Override
   public void onAnimationUpdate(ValueAnimator valueAnimator) {
    animatedValue = (float) valueAnimator.getAnimatedValue();
    postInvalidate();
   }
  });
  mValueAnimator.start();
 }
 //    
 private void drawTick(Canvas canvas) {
  float temp = tickValue * totalLength;
  Log.i(TAG, "temp:" + temp + "downlength :" + downLength);
  if (Float.compare(tickValue, 0f) == 0) {
   Log.i(TAG, "startPoint : " + startPoint.x + ", " + startPoint.y);
   path.reset();
   path.moveTo(startPoint.x, startPoint.y);
  }
  if (temp > downLength) {
   path.moveTo(startPoint.x, startPoint.y);
   path.lineTo(breakPoint.x, breakPoint.y);
   Log.i(TAG, "endPoint : " + endPoint.x + ", " + endPoint.y);
   path.lineTo((endPoint.x - breakPoint.x) * (temp - downLength) / upLength + breakPoint.x, (endPoint.y - breakPoint.y) * (temp - downLength) / upLength + breakPoint.y);
  } else {
   Log.i(TAG, "down x : " + (breakPoint.x - startPoint.x) * temp / downLength + ",down y: " + (breakPoint.y - startPoint.y) * temp / downLength);
   path.lineTo((breakPoint.x - startPoint.x) * temp / downLength + startPoint.x, (breakPoint.y - startPoint.y) * temp / downLength + startPoint.y);
  }
  canvas.drawPath(path, tickPaint);
 }
 //    
 private void drawBorder(Canvas canvas) {
  float temp;
  if (animatedValue > 1f) {
   temp = animatedValue * mRadius;
  } else {
   temp = mRadius;
  }
  canvas.drawCircle(center, center, temp, borderPaint);
 }
 //  checkbox  
 private void drawTrim(Canvas canvas) {
  canvas.drawCircle(center, center, (mRadius - mStrokeWidth) * animatedValue, trimPaint);
 }
 @Override
 public void onClick(View view) {
  toggle();
 }
 /**
  *   checkbox      
  *
  * @return
  */
 public boolean isChecked() {
  return isChecked;
 }
 /**
  *   checkbox   
  *
  * @param isChecked     
  */
 public void setChecked(boolean isChecked) {
  this.setChecked(isChecked, false);
 }
 /**
  *   checkbox   
  *
  * @param isChecked     
  * @param isAnimation         
  */
 public void setChecked(boolean isChecked, boolean isAnimation) {
  this.isChecked = isChecked;
  if (isAnimation) {
   if (isChecked) {
    checkedAnimation();
   } else {
    uncheckedAnimation();
   }
  } else {
   animatedValue = isChecked ? 1f : 0f;
   tickValue = 1f;
   invalidate();
  }
  if (listener != null) {
   listener.onCheckedChanged(this, isChecked);
  }
 }
 public interface OnCheckedChangeListener {
  void onCheckedChanged(SmoothCheckBox smoothCheckBox, boolean isChecked);
 }
}이상 은 이 글 의 전체 내용 입 니 다.본 논문 의 내용 이 여러분 의 학습 이나 업무 에 어느 정도 도움 이 되 기 를 바 랍 니 다.궁금 한 점 이 있 으 면 댓 글 을 남 겨 주 십시오.
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