每次想到循环播放、重复执行时,脑海中总是冒出在while(true)的实现方式。
Thread thread = new Thread(new Runnable(){
public void run(){
while(true){
// do animation operation
}
}
}).start();
但这种方式总给人一种不可靠的感觉。
为此,在这多记录几种实现方式,方便以后参考。
第一种:使用属性动画实现(ObjectAnimator)
Path path = new Path();
path.addOval(100, -500, 500, -100, Path.Direction.CW);
ObjectAnimator ivGreenObjectAnimator = ObjectAnimator.ofFloat(ivRed, View.TRANSLATION_X, View.TRANSLATION_Y, path); ivGreenObjectAnimator.setDuration(5000).setRepeatCount(ValueAnimator.INFINITE);
ivGreenObjectAnimator.setRepeatMode(ValueAnimator.RESTART);
ivGreenObjectAnimator.start();
效果:绿色小球沿着椭圆循环运动。
第二种:使用属性动画实现(ViewPropertyAnimator)
private void startAnimateByViewAnimationProperty() {
ViewPropertyAnimator ivGreenAnimate = ivGreen.animate();int[] positions = new int[]{600, 100, 100, 400};
ivGreenAnimate.translationX(400).setDuration(500).setListener(new ComplexAnimatorListener(ivGreen, positions));
} static class ComplexAnimatorListener implements Animator.AnimatorListener {
View view;
int[] positions;
int times = 0;
public ComplexAnimatorListener(View view, int[] positions) {
this.view = view;
this.positions = positions;
} @Override
public void onAnimationStart(Animator animation) { } @Override
public void onAnimationEnd(Animator animation) {
Log.v("qian", "repeat running!");
times++;
if (times % 4 == 1) {
view.animate().translationY(positions[0]).setDuration(500).setListener(this);
} else if (times % 4 == 2) {
view.animate().translationX(positions[1]).setDuration(500).setListener(this);
} else if (times % 4 == 3) {
view.animate().translationY(positions[2]).setDuration(500).setListener(this);
} else
view.animate().translationX(positions[3]).setDuration(500).setListener(this);
} @Override
public void onAnimationCancel(Animator animation) { } @Override
public void onAnimationRepeat(Animator animation) { }
}
效果:绿色小球沿着矩形循环运动。
第三种:使用一般动画实现(TranslateAnimation)
TranslateAnimation translateAnimation = new TranslateAnimation(-400, -100, -400, -100);
translateAnimation.setRepeatCount(Animation.INFINITE);
translateAnimation.setRepeatMode(Animation.REVERSE);
ivGreen.startAnimation(translateAnimation);
效果:小球沿着矩形循环运动。
第四种:使用handler及其callback递归调用实现
Handler handler = new Handler(new Handler.Callback() {
@Override
public boolean handleMessage(Message msg) {
if(msg.what==1){
startAnimation();
}
return false;
}
}); private void startAnimation(){
//do animation operation
Message message = new Message();
message.what = 1;
handler.sendMessage(message);
}
一次执行完又执行
第五种:使用handler及其runnable递归调用实现
Handler handler = new Handler(); Runnable runnable = new Runnable() {
@Override
public void run() {
ViewPropertyAnimator animate = binding.ivBlue.animate();
animate.translationXBy(-200).translationYBy(-200).scaleX(2.0f).scaleY(2.0f).
setInterpolator(new AccelerateDecelerateInterpolator()).setDuration(500).start();
printProperty(binding.ivBlue);
handler.postDelayed(this, 500);
}
}; private void startAnimation(){
handler.postDelayed(this, 500);
}
递归调用postDelayed方法。