动画 -- 点击按钮

 1  @Override
 2  public View onCreateView(LayoutInflater inflater, ViewGroup container,
 3        Bundle savedInstanceState) {
 4    View rootView = inflater.inflate(R.layout.fragment_main, container, false);
 5    rootView.findViewById(R.id.btnAnimMe).setOnClickListener(new View.OnClickListener() {
 6    @Override
 7    public void onClick(View arg0) {
 8        arg0.startAnimation(AnimationUtils.loadAnimation(getActivity(), R.anim.aa));
 9    }
10    });
11    return rootView;
12  }

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <!--
 3     fromAlpha:开始时透明度
 4     toAlpha： 结束时透明度
 5     duration：动画持续时间
 6 -->
 7 <alpha xmlns:android="http://schemas.android.com/apk/res/android"
 8     android:fromAlpha="0"
 9     android:toAlpha="1"
10     android:duration="1000" >
11 </alpha>