动画

1.创建四种动画star

        ScaleAnimation scaleAnimation = new ScaleAnimation(0, 2, 0, 2);
        TranslateAnimation translateAnimation = new TranslateAnimation(0, 100, 0, 100);
        AlphaAnimation alphaAnimation = new AlphaAnimation(0, 1);
        RotateAnimation rotateAnimation = new RotateAnimation(0, 360);

2.创建动画集合
3.设置动画时间保存动画

AnimationSet animationSet = new AnimationSet(true);
        animationSet.setDuration(5000);//设置时间
        animationSet.addAnimation(scaleAnimation);//运行缩放
        animationSet.addAnimation(translateAnimation);//位移
        animationSet.addAnimation(alphaAnimation);//渐变
        animationSet.addAnimation(rotateAnimation);//旋转

4.图片开启或者存入动画

  ivImg.setAnimation(animationSet);//设置动画集合

Rxjava倒计时：
1.自定义变量long类型长度随设置时间来说
2.设置闪屏

 Observable.interval(1000, TimeUnit.MILLISECONDS)//一秒

3.再次声明新的long变量等于定义时间变量count-along（参数）
4.判断如果新变量大于等于0数tvtext修改（“倒计时：”+newcount）
5 private Disposable disposable;等于d 为了使方式多次进入本页面

 .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer<Long>() {
                    @Override
                    public void onSubscribe(Disposable d) {
                        disposable = d;
                    }

                    @Override
                    public void onNext(Long aLong) {
                        long newCount = count - aLong;
                        if (newCount >= 0) {
                            tvDao.setText("倒计时：" + newCount);
                        } else {
                            disposable.dispose();
                            startActivity(new Intent(MainActivity.this, CollPrjiectActivity.class));
                            finish();
                        }
                    }

                    @Override
                    public void onError(Throwable e) {

                    }

                    @Override
                    public void onComplete() {

                    }
                });