public void explode(Bitmap bitmap, Rect bound, long startDelay, long duration) { final ExplosionAnimator explosion = new ExplosionAnimator(this, bitmap, bound); explosion.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { mExplosions.remove(animation); } }); explosion.setStartDelay(startDelay); explosion.setDuration(duration); mExplosions.add(explosion); explosion.start(); }
@Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); for (ExplosionAnimator explosion : mExplosions) { explosion.draw(canvas); } }
public ExplosionAnimator(View container, Bitmap bitmap, Rect bound) { mPaint = new Paint(); mBound = new Rect(bound); int partLen = 15; mParticles = new Particle[partLen * partLen]; Random random = new Random(System.currentTimeMillis()); int w = bitmap.getWidth() / (partLen + 2); int h = bitmap.getHeight() / (partLen + 2); for (int i = 0; i < partLen; i++) { for (int j = 0; j < partLen; j++) { mParticles[(i * partLen) + j] = generateParticle(bitmap.getPixel((j + 1) * w, (i + 1) * h), random); } } mContainer = container; setFloatValues(0f, END_VALUE); setInterpolator(DEFAULT_INTERPOLATOR); setDuration(DEFAULT_DURATION); }
public boolean draw(Canvas canvas) { if (!isStarted()) { return false; } for (Particle particle : mParticles) { particle.advance((float) getAnimatedValue()); if (particle.alpha > 0f) { mPaint.setColor(particle.color); mPaint.setAlpha((int) (Color.alpha(particle.color) * particle.alpha)); canvas.drawCircle(particle.cx, particle.cy, particle.radius, mPaint); } } mContainer.invalidate(); return true; }