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>