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

 
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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:


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:

<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" 
    android:id="@+id/viewGroup"
    >
    
    <Button
        android:id="@+id/button_add"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_x="0dp"
        android:layout_y="367dp"
        android:text="添加图片" />

    <Button
        android:id="@+id/button_delete"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_x="0dp"
        android:layout_y="410dp"
        android:text="删除图片" />

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_x="153dp"
        android:layout_y="155dp"
        android:src="@drawable/ic_launcher" />

</AbsoluteLayout>


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