Android开发--图形图像与动画（四）--AnimationListener简介

左手的ㄟ右手 2022-04-16 05:24 127阅读 0赞

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就像Button控件有监听器一样，动画效果也有监听器，只需要实现AnimationListener就可以实现对动画效果的监听，其中需要重载三个函数，就是下面的这几个函数：

private class MyListenr implements AnimationListener{  @Override  public void onAnimationEnd(Animation arg0) {   // TODO Auto-generated method stub  }  @Override  public void onAnimationRepeat(Animation arg0) {   // TODO Auto-generated method stub  }  @Override  public void onAnimationStart(Animation arg0) {   // TODO Auto-generated method stub  }   }

其中第一个函数的意思是在动画执行完之后需要开发者做什么，第二个函数的意思是在动画重复执行的过程中应该做什么，第三个函数的意思是当动画开始执行时有什么动作发生。

下面我实现了一个例子，点击删除按钮，图片慢慢淡去，并最终删除，当点击添加按钮时向viewGroup中添加一个imageview，实现的截图如下：

![1359185623_2071.png][]  
具体的实现代码如下：

public class MainActivity extends Activity { private Button button; private Button button2; private ImageView imageView; private ViewGroup viewGroup; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  button=(Button)findViewById(R.id.button_add);  button2=(Button)findViewById(R.id.button_delete);  imageView=(ImageView)findViewById(R.id.imageView1);  viewGroup=(ViewGroup)findViewById(R.id.viewGroup);  button.setOnClickListener(new Mybutton());  button2.setOnClickListener(new Mybutton()); } private class Mybutton implements OnClickListener{  @Override  public void onClick(View v) {   // TODO Auto-generated method stub   switch (v.getId()) {   case R.id.button_add:    Add();    break;   case R.id.button_delete:    Delete();    break;   default:    break;   }  } }  public void Add() {  AlphaAnimation alphaAnimation=new AlphaAnimation(0.0f, 1.0f);  alphaAnimation.setDuration(2000);  alphaAnimation.setStartOffset(500);  ImageView imageViewAdd=new ImageView(MainActivity.this);  imageViewAdd.setImageResource(R.drawable.ic_launcher);  viewGroup.addView(imageViewAdd);//  viewGroup.addView(imageViewAdd, new LayoutParams(//    LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));  imageViewAdd.startAnimation(alphaAnimation); } public void Delete() {  AlphaAnimation alphaAnimation=new AlphaAnimation(1.0f, 0.0f);  alphaAnimation.setDuration(2000);  alphaAnimation.setStartOffset(500);  imageView.startAnimation(alphaAnimation);  alphaAnimation.setAnimationListener(new MyListenr()); }  private class MyListenr implements AnimationListener{  @Override  public void onAnimationEnd(Animation arg0) {   // TODO Auto-generated method stub   viewGroup.removeView(imageView);   Log.d("BruceZhang", "Animation End!");  }  @Override  public void onAnimationRepeat(Animation arg0) {   // TODO Auto-generated method stub   Log.d("BruceZhang", "Animation Repeat!");  }  @Override  public void onAnimationStart(Animation arg0) {   // TODO Auto-generated method stub   Log.d("BruceZhang", "Animation Start!");  }   } @Override public boolean onCreateOptionsMenu(Menu menu) {  // Inflate the menu; this adds items to the action bar if it is present.  getMenuInflater().inflate(R.menu.activity_main, menu);  return true; }}

此实例的布局文件如下，注意，需要在根标签下给出viewGroup的id：

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![这里写图片描述][SouthEast]

[http_blog.csdn.net_jiangjunshow]: https://blog.csdn.net/jiangjunshow/article/details/77338485
[1359185623_2071.png]: https://img-my.csdn.net/uploads/201301/26/1359185623_2071.png
[SouthEast]: /images/20220416/d60558bbd98f4ec7b8090b7e4cd363bd.png