呼，忙了两天了这个，找了各种资料，勉勉强强实现我的功能，这个还得改进一下，线程方面的知识没有学到多少，弄了线程画UI有着各种bug，无奈。。就这样跳过先了，哪一天有时间在回来搞一下。
正文————
要实现开头动画，有两种方法，一种是用xml文件定义，第二种则是用java实现。
xml动画中，有着四种基本的动画，如下图片说明
可以使用这四种组合出更加高级的xml动画
使用xml动画的方法过程：
第一步，首先要在res新建一个anim的文件夹，之后，在里面写xml动画文件，如图
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第二步，加载资源文件
示范代码如下，改一下后面的R.anin.xxx
Animation animation=AnimationUtils.loadAnimation(this, R.anim.fade_in);
第三步，为某个控件指定动画
first.startAnimation(animation);
PS：
- first是一个ImageView
- 这个方法放在线程run()方法里会报错，我对线程不太懂，所以还找不到解决办法
除此之外，一般我们都是要给animation添加监听器，定义动画开始前的行为，动画循坏的行为，和动画结束的行为
AnimationListener animationlistener = new AnimationListener() {//设置动画监听事件
@Override
public void onAnimationStart(Animation arg0) {//动画开始前
// TODO Auto-generated method stub
}
@Override
public void onAnimationRepeat(Animation arg0) {//动画循坏时
// TODO Auto-generated method stub
}
@Override
public void onAnimationEnd(Animation arg0) {//动画结束后
Intent intent = new Intent();
intent.setClass(StartActivity.this, MainActivity.class);
StartActivity.this.startActivity(intent);
}
};
开头动画一般结束之后都是跳转到app主界面的activity，用Intent意图跳转activity
不要忘了在AndroidMainfest里面声明一个activity
animation.setAnimationListener(animationlistener);
之后设置监听器方法，这个不要忘
使用java方法实现动画效果：
第一步，new一个动画对象
AlphaAnimation alphaanimation = new AlphaAnimation(0.0f, 1.0f);
//透明度从0.0（完全透明）到1.0（完全不透明）
上述代码就是实现淡入效果的，举一反三，其他的这里便不多说
第二步，为对象设置相关属性，
alphaanimation.setDuration(3000);//设置动画持续时间为3s
alphaanimation.setFillAfter(true);//设置动画结束后保留当前状态
当然不止这两种属性，不过常用的就这两种了，其他的话，百度吧
第三步，为控件指定动画
first.startAnimation(alphaanimation);
PS：参数就是上述的对象名
个人使用中遇到的问题：
如果控件的visibility属性为gone的话，动画效果无法显示出来，要将visibility属性改为invisible，这样就行了