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我有两件事。平滑地改变动画制作期间的动画持续时间
首先是一个循环缩放动画，做一种永久放大/缩小。
第二件事是TimerTask设置这个缩放动画的持续时间每20秒。
问题是，当发生setDuration()时，动画中有时会出现某种“跳跃”。
首先，我把这个setDuration()在TimerTask，然后我只是试图把国旗在TimerTask和onAnimationEnd()改变了时间，没有工作没有，同样的问题。在他的代码下面我使用这个标志技术。
如果没有足够的清晰度，所有这些的目标是对可绘制圆进行“无限”放大/缩小，放大/缩小速度会随着时间的推移而减少。如上所述，它确实有效，但并不顺利。
有没有办法顺利地做到这一点？
，设置标志 “changeDurationFlag”
private void setRegularRythmeDecrease() {
final Handler handler = new Handler();
Timer timer = new Timer();
TimerTask task = new TimerTask() {
@Override
public void run() {
handler.post(new Runnable() {
public void run() {
try {
if (elapsedTime > sessionLengthInSec) {
circle.clearAnimation();
}
zoomDuration = zoomDuration + (toDecreaseEveryUpdate/2);
changeDurationFlag = true;
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
};
timer.schedule(task, 0, BREATH_RYTHME_UPDATE_INTERVAL_IN_SECONDS*1000);
}
我使用放大和缩小的ScaleAnimation的TimeTask
public Animation scaleAnimation(View v, float startScale, float endScale, long duration) {
Animation anim = new ScaleAnimation(
startScale, endScale,
startScale, endScale,
Animation.RELATIVE_TO_SELF, 0.5f,
Animation.RELATIVE_TO_SELF, 0.5f);
anim.setFillAfter(true);
anim.setDuration(duration);
return anim;
}
，其中持续时间设置动画听众
zoomDuration = ZOOM_DURATION_START;
animZoomIn = scaleAnimation(circle, 1f, ZOOM_FACTOR,zoomDuration);
animZoomOut = scaleAnimation(circle, ZOOM_FACTOR, 1f,zoomDuration);
animZoomIn.setAnimationListener(new Animation.AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
// If the flag is true (modified in the TimerTask) I set the Duration to decrease the speed
// it's where the not smoothly thing happens
if(changeDurationFlag) {
Log.d("beat ","Set breath to " + String.valueOf(zoomDuration * 2d));
animZoomIn.setDuration(zoomDuration);
animZoomOut.setDuration(zoomDuration);
changeDurationFlag = false;
}
circle.startAnimation(animZoomOut);
}
@Override
public void onAnimationRepeat(Animation animation) {
}
});
animZoomOut.setAnimationListener(new Animation.AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
circle.startAnimation(animZoomIn);
currentDateTime = Calendar.getInstance().getTime();
elapsedTime = currentDateTime.getTime() - startDateTime.getTime();
long elapsedTimeInSeconds = TimeUnit.MILLISECONDS.toSeconds(elapsedTime);
beatCount++;
}
@Override
public void onAnimationRepeat(Animation animation) {
}
});