android之Animation<1>

public class MainActivity extends Activity {

	private ImageView image;
	private Button alpha_btn, rotate_btn, scale_btn, translate_btn;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		
		image = (ImageView)findViewById(R.id.image);
		alpha_btn = (Button)findViewById(R.id.alpha);
		rotate_btn = (Button)findViewById(R.id.rotate);
		scale_btn = (Button)findViewById(R.id.scale);
		translate_btn = (Button)findViewById(R.id.translate);
		
		alpha_btn.setOnClickListener(new OnClickListener() {
			
			public void onClick(View v) {
				//1.创建一个AnimationSet对象
				AnimationSet animationSet = new AnimationSet(true);
				//2.创建一个AlphaAnimation对象,Alpha透明度渐变,全不透到全透的渐变
				AlphaAnimation alphaAnimation = new AlphaAnimation(1, 0);
				//3.为AlphaAnimation设置相应的数据
				alphaAnimation.setDuration(5000);
				//4.将AlphaAnimation添加到AnimationSet对象中
				animationSet.addAnimation(alphaAnimation);
				//5.执行动画
				image.startAnimation(animationSet);
			}
		});
		
		rotate_btn.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				AnimationSet animationSet = new AnimationSet(true);
				//以image的左上角为旋转轴点
				//RotateAnimation rotate = new RotateAnimation(0, 360);
				/*绝对像素，相对于view的左上角
				RotateAnimation rotate = new RotateAnimation(0, 360,
						Animation.ABSOLUTE, 150, 
						Animation.ABSOLUTE, 150);
				*/
				/*相对于view自身
				RotateAnimation rotate = new RotateAnimation(0, 360,
						Animation.RELATIVE_TO_SELF, 0.5f, 
						Animation.RELATIVE_TO_SELF, 0.5f);
				*/
				RotateAnimation rotate = new RotateAnimation(0, 360,
						Animation.RELATIVE_TO_PARENT, 0.5f, 
						Animation.RELATIVE_TO_PARENT, 0.5f);
				
				rotate.setDuration(5000);
				animationSet.addAnimation(rotate);
				image.startAnimation(rotate);
			}
		});
		
		
		scale_btn.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				AnimationSet animationSet = new AnimationSet(true);
				ScaleAnimation scale = new ScaleAnimation(
						0.1f, 1f, 0.1f, 1f, //x，y缩放比例
						Animation.RELATIVE_TO_SELF, 0.5f,//缩放中心点 
						Animation.RELATIVE_TO_SELF, 0.5f);
				scale.setDuration(3000);
				animationSet.addAnimation(scale);
				image.startAnimation(animationSet);
			}
		});
		
		translate_btn.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				AnimationSet animationSet = new AnimationSet(true);
				TranslateAnimation translate = new TranslateAnimation(
						Animation.RELATIVE_TO_SELF, 1f,//起始移动的x
						Animation.RELATIVE_TO_SELF, 0f,//起始移动的y
						Animation.RELATIVE_TO_SELF, 0.5f,//移动终点x
						Animation.RELATIVE_TO_SELF, 0f);//移动终点y
				translate.setDuration(3000);
				animationSet.addAnimation(translate);
				image.startAnimation(animationSet);
			}
		});
	}

}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    
	<ImageView 
	    android:id="@+id/image"
	    android:layout_width="wrap_content"
	    android:layout_height="wrap_content"
	    android:layout_centerInParent="true"
	    android:src="@drawable/teas"/>
	
	
	<Button 
	    android:id="@+id/alpha"
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:layout_marginTop="0dp"
	    android:text="Alpha"/>
	
	<Button 
	    android:id="@+id/rotate"
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:layout_below="@id/alpha"
	    android:layout_marginTop="20dp"
	    android:text="rotate"/>
	
	<Button 
	    android:id="@+id/scale"
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:layout_alignParentBottom="true"
	    android:text="scale"/>
	
	<Button 
	    android:id="@+id/translate"
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:layout_above="@id/scale"
	    android:layout_marginBottom="20dp"
	    android:text="translate"/>
    
    
</RelativeLayout>