安卓的動畫各種各樣，新加的屬性動畫可以很好的實現(xiàn)動畫效果。 如何實現(xiàn)一個簡單的加載動畫呢？ Frist of all, Because of you are custom view, you need extends the View,and implement there important method,such as onMeasure()、onDraw()、onLayout().. Then, you need some paints to draw,so that…
public FourCirlceRotate(Context context, AttributeSet attrs) { super(context, attrs); paint1 = new Paint(); paint2 = new Paint(); paint3 = new Paint(); paint4 = new Paint(); paint5 = new Paint(); paint1.setColor(Color.parseColor("#ff0099cc")); paint2.setColor(Color.parseColor("#ff669900")); paint3.setColor(Color.parseColor("#ffcc0000")); paint4.setColor(Color.parseColor("#ffaa66cc")); paint5.setColor(Color.parseColor("#ffffbb33")); }and you should get the value animator, just like this!
PRivate ValueAnimator getValueAnimator() { ValueAnimator valueAnimator = ValueAnimator.ofFloat(0f, 8f); valueAnimator.setDuration(4000); valueAnimator.setInterpolator(new LinearInterpolator()); valueAnimator.start(); return valueAnimator; }and you should fresh your screen when your application had runing.
public void startAnimation() { if (valueAnimator == null) { valueAnimator = getValueAnimator(); } else { valueAnimator.start(); } R = getHeight() / 6; postDelayed(new Runnable() { @Override public void run() { if (!stop) { startAnimation(); invalidate(); } } }, valueAnimator.getDuration()); init = true; }then,The best part of it is you need set some coding on onDraw() method to make it happen.
@Override protected void onDraw(Canvas canvas) { super.onDraw(canvas);// Log.i(TAG, "onDraw " + where); if (!init) { startAnimation(); } Log.e(">>>>>>>>>>>>>>>>>","show:"+show+"where:"+where); //顯示固定的圓，逐個出現(xiàn) if (show <= 4) { canvas.drawCircle(R, R, R, paint2); } if (show <= 3) { canvas.drawCircle(getWidth() - R, R, R, paint3); } if (show <= 2) { canvas.drawCircle(getWidth() - R, getHeight() - R, R, paint4); } if (show <= 1) { canvas.drawCircle(R, getHeight() - R, R, paint5); } //逐個消失 if (show > 4) { if (show <= 4) { canvas.drawCircle(R, R, R, paint2); } if (show <= 5) { canvas.drawCircle(getWidth() - R, R, R, paint3); } if (show <= 6) { canvas.drawCircle(getWidth() - R, getHeight() - R, R, paint4); } if (show <= 7) { canvas.drawCircle(R, getHeight() - R, R, paint5); } } //移動 if (where < 1 && where > 0) { canvas.drawCircle(R + (getWidth() - 2 * R) * where, R, R, paint1); show = 4; } if (where < 2 && where > 1) { canvas.drawCircle(getHeight() - R, R + (getHeight() - 2 * R) * (where - 1), R, paint1); show = 3; } if (where < 3 && where > 2) { canvas.drawCircle(getWidth() - R - (getWidth() - 2 * R) * (where - 2), getHeight() - R, R, paint1); show = 2; } if (where < 4 && where > 3) { canvas.drawCircle(R, getHeight() - R - (getHeight() - 2 * R) * (where - 3), R, paint1); show = 1; } if (where > 4 && where < 5) { canvas.drawCircle(R + (getWidth() - 2 * R) * (where - 4), R, R, paint1); show = 5; } if (where > 5 && where < 6) { canvas.drawCircle(getHeight() - R, R + (getHeight() - 2 * R) * (where - 5), R, paint1); show = 6; } if (where > 6 && where < 7) { canvas.drawCircle(getWidth() - R - (getWidth() - 2 * R) * (where - 6), getHeight() - R, R, paint1); show = 7; } if (where > 7 && where < 8) { canvas.drawCircle(R, getHeight() - R - (getHeight() - 2 * R) * (where - 7), R, paint1); show = 8; } if (isStart) { where = (float) valueAnimator.getAnimatedValue(); } if (valueAnimator.isRunning()) { isStart = true; invalidate(); } }新聞熱點
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