Android如何實(shí)現(xiàn)仿直播特效點(diǎn)贊飄心效果

/** 
 * @author 劉洋巴金 
 * @date 2017-4-27 
 * 
 * 定義我們自己的布局 
 * */ 
public class LoveLayout extends RelativeLayout{ 
 
 private Context context; 
 private LayoutParams params; 
 private Drawable[] icons = new Drawable[4]; 
 private Interpolator[] interpolators = new Interpolator[4]; 
 private int mWidth; 
 private int mHeight; 
 
 public LoveLayout(Context context, AttributeSet attrs) { 
 super(context, attrs); 
  
 this.context = context; 
 initView(); 
 } 
 
 private void initView() { 
  
 // 圖片資源 
 icons[0] = getResources().getDrawable(R.drawable.green); 
 icons[1] = getResources().getDrawable(R.drawable.purple); 
 icons[2] = getResources().getDrawable(R.drawable.red); 
 icons[3] = getResources().getDrawable(R.drawable.yellow); 
  
 // 插值器 
 interpolators[0] = new AccelerateDecelerateInterpolator(); // 在動畫開始與結(jié)束的地方速率改變比較慢，在中間的時候加速 
 interpolators[1] = new AccelerateInterpolator(); // 在動畫開始的地方速率改變比較慢，然后開始加速 
 interpolators[2] = new DecelerateInterpolator(); // 在動畫開始的地方快然后慢 
 interpolators[3] = new LinearInterpolator(); // 以常量速率改變 
  
 int width = icons[0].getIntrinsicWidth(); 
 int height = icons[0].getIntrinsicWidth(); 
 params = new LayoutParams(width, height); 
 params.addRule(CENTER_HORIZONTAL, TRUE); 
 params.addRule(ALIGN_PARENT_BOTTOM, TRUE); 
 } 

@Override 
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
 // TODO Auto-generated method stub 
 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 
 mWidth = getMeasuredWidth(); 
 mHeight = getMeasuredHeight(); 
} 
 
public void addLoveView() { 
 // TODO Auto-generated method stub 
 final ImageView iv = new ImageView(context); 
 iv.setLayoutParams(params); 
 iv.setImageDrawable(icons[new Random().nextInt(4)]); 
 addView(iv); 
  
 // 開啟動畫，并且用完銷毀 
 AnimatorSet set = getAnimatorSet(iv); 
 set.start(); 
 set.addListener(new AnimatorListenerAdapter() { 
 @Override 
 public void onAnimationEnd(Animator animation) { 
  // TODO Auto-generated method stub 
  super.onAnimationEnd(animation); 
  removeView(iv); 
 } 
 }); 
} 

/** 
 * 獲取動畫集合 
 * @param iv 
 * */ 
private AnimatorSet getAnimatorSet(ImageView iv) { 
  
 // 1.alpha動畫 
 ObjectAnimator alpha = ObjectAnimator.ofFloat(iv, "alpha", 0.3f, 1f); 
  
 // 2.縮放動畫 
 ObjectAnimator scaleX = ObjectAnimator.ofFloat(iv, "scaleX", 0.2f, 1f); 
 ObjectAnimator scaleY = ObjectAnimator.ofFloat(iv, "scaleY", 0.2f, 1f); 
  
 // 動畫集合 
 AnimatorSet set = new AnimatorSet(); 
 set.playTogether(alpha, scaleX, scaleY); 
 set.setDuration(500); 
  
 // 貝塞爾曲線動畫 
 ValueAnimator bzier = getBzierAnimator(iv); 
  
 AnimatorSet set2 = new AnimatorSet(); 
 set2.playSequentially(set, bzier); 
 set2.setTarget(iv); 
 return set2; 
} 

/** 
 * 貝塞爾動畫 
 * */ 
private ValueAnimator getBzierAnimator(final ImageView iv) { 
 // TODO Auto-generated method stub 
 PointF[] PointFs = getPointFs(iv); // 4個點(diǎn)的坐標(biāo) 
 BasEvaluator evaluator = new BasEvaluator(PointFs[1], PointFs[2]); 
 ValueAnimator valueAnim = ValueAnimator.ofObject(evaluator, PointFs[0], PointFs[3]); 
 valueAnim.addUpdateListener(new AnimatorUpdateListener() { 
  
 @Override 
 public void onAnimationUpdate(ValueAnimator animation) { 
  // TODO Auto-generated method stub 
  PointF p = (PointF) animation.getAnimatedValue(); 
  iv.setX(p.x); 
  iv.setY(p.y); 
  iv.setAlpha(1- animation.getAnimatedFraction()); // 透明度 
 } 
 }); 
 valueAnim.setTarget(iv); 
 valueAnim.setDuration(3000); 
 valueAnim.setInterpolator(interpolators[new Random().nextInt(4)]); 
 return valueAnim; 
} 
 
private PointF[] getPointFs(ImageView iv) { 
 // TODO Auto-generated method stub 
 PointF[] PointFs = new PointF[4]; 
 PointFs[0] = new PointF(); // p0 
 PointFs[0].x = (mWidth- params.width)/ 2; 
 PointFs[0].y = mHeight - params.height; 
 
 PointFs[1] = new PointF(); // p1 
 PointFs[1].x = new Random().nextInt(mWidth); 
 PointFs[1].y = new Random().nextInt(mHeight /2) + mHeight / 2 + params.height; 
 
 PointFs[2] = new PointF(); // p2 
 PointFs[2].x = new Random().nextInt(mWidth); 
 PointFs[2].y = new Random().nextInt(mHeight /2); 
  
 PointFs[3] = new PointF(); // p3 
 PointFs[3].x = new Random().nextInt(mWidth); 
 PointFs[3].y = 0; 
 return PointFs; 
} 

/** 
 * @author 劉洋巴金 
 * @date 2017-4-27 
 * 
 * 估值器，計(jì)算路徑 
 * */ 
public class BasEvaluator implements TypeEvaluator<PointF> { 
 
 private PointF p1; 
 private PointF p2; 
 
 public BasEvaluator(PointF p1, PointF p2) { 
 super(); 
 this.p1 = p1; 
 this.p2 = p2; 
 } 
 
 @Override 
 public PointF evaluate(float fraction, PointF p0, PointF p3) { 
 // TODO Auto-generated method stub 
 PointF pointf = new PointF(); 
  
 // 貝塞爾曲線公式 p0*(1-t)^3 + 3p1*t*(1-t)^2 + 3p2*t^2*(1-t) + p3^3 
 pointf.x = p0.x * (1-fraction) *(1-fraction ) * (1-fraction) 
   +3*p1.x * fraction *(1-fraction )*(1-fraction ) 
   +3*p2.x *fraction *fraction *(1-fraction ) 
   +p3.x*fraction *fraction *fraction ; 
 pointf.y = p0.y * (1-fraction ) *(1-fraction ) * (1-fraction ) 
  +3*p1.y * fraction *(1-fraction )*(1-fraction ) 
  +3*p2.y *fraction *fraction *(1-fraction ) 
  +p3.y*fraction *fraction *fraction ; 
 return pointf; 
 } 
} 

btn_press = (Button)findViewById(R.id.btn_press); 
ll_love = (LoveLayout)findViewById(R.id.ll_love); 
btn_press.setOnClickListener(new OnClickListener() { 
  
 @Override 
 public void onClick(View v) { 
 // TODO Auto-generated method stub 
 ll_love.addLoveView(); 
 } 
});